CN117728540A - Storage battery pack balanced charge and discharge control device and method - Google Patents
Storage battery pack balanced charge and discharge control device and method Download PDFInfo
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Abstract
The invention discloses a storage battery pack balanced charge and discharge control device and a method, wherein the device comprises a microprocessor module, a single-phase alternating current power grid, an alternating current-direct current full-control bridge converter and a storage battery pack circuit module; the single-phase alternating current power grid is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module; the AC-DC full-control bridge converter is used for generating an AC side inductance current and transmitting the inductance current to the microprocessor module; the storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module; the microprocessor module generates a PWM charging control signal and a PWM discharging control signal according to the alternating current grid voltage instantaneous value, the alternating current side inductance current and the storage battery pack electrical data; the technical problem that the service life of the storage battery pack is short because the stable storage battery voltage and charging current cannot be obtained in the main equalization mode of the existing storage battery pack is solved.
Description
Technical Field
The invention relates to the technical field of battery control, in particular to a storage battery pack balanced charge and discharge control device and method.
Background
The storage battery is widely applied to the fields of military, aerospace, industrial and agricultural production, communication, UPS (Uninterruptible Power Supply), electric automobile, new energy storage and the like, and because the voltage capacity of single batteries is limited, a plurality of single batteries are generally connected in series to form a storage battery pack, thereby meeting the voltage requirement.
When the storage battery pack is discharged, the battery cell with the lowest voltage is most easy to overdischarge, whereas when the storage battery pack is charged, the battery cell with the highest voltage is most easy to overcharge. With the cyclic use of charge and discharge, the inconsistency among the battery packs is more and more serious, and the performance difference of the single batteries in the long-term use process is unavoidable under the current manufacturing technology level and application conditions, so that the balanced charge management of the storage battery pack is an effective method for improving the service life of the battery pack at present.
The main equalization mode of the existing storage battery pack is resistance energy consumption type, and the current is shunted when the resistor is connected in parallel to each battery to achieve the purpose of battery equalization, but the mode that redundant electric energy is lost in a heat energy mode to achieve energy equalization among the single batteries belongs to lossy equalization, and stable storage battery voltage and charging current cannot be obtained, so that the service life of the storage battery pack is short.
Disclosure of Invention
The invention provides a storage battery balanced charge and discharge control device and method, which are used for solving the technical problems that the service life of a storage battery is short because stable storage battery voltage and charging current cannot be obtained by shunting current when the existing storage battery is charged by connecting resistors in parallel on each battery in a main balanced mode.
The invention provides a storage battery pack balanced charge and discharge control device, which comprises a microprocessor module, a single-phase alternating-current power grid, an alternating-current and direct-current full-control bridge converter and a storage battery pack circuit module, wherein the microprocessor module is connected with the single-phase alternating-current power grid;
two ends of the AC/DC full-control bridge converter are respectively connected with the single-phase AC power grid and the storage battery pack circuit module;
the single-phase alternating current power grid, the alternating current-direct current full-control bridge converter and the storage battery pack circuit module are all connected with the microprocessor module;
the single-phase alternating current power grid is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module;
the AC/DC full-control bridge converter is used for generating an AC side inductance current and transmitting the AC side inductance current to the microprocessor module;
the storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module;
The microprocessor module is used for calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side inductance current, generating a PWM charging control signal according to a preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets a preset charging condition, and generating a PWM discharging control signal according to a preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets a preset discharging condition;
the PWM charging control signal and the PWM discharging control signal are used for controlling the full-control switch diode module in the AC/DC full-control bridge converter and the full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
Optionally, the battery pack electrical data includes a battery pack voltage instantaneous value, a direct current bus capacitor voltage, and a battery pack current; the storage battery pack circuit module comprises a direct current bus filter, a direct current power double-quadrant converter and a storage battery pack capacity balancing circuit;
Two ends of the direct current power double-image limit converter are respectively connected with the direct current bus filter and the storage battery capacity balancing circuit;
the direct current bus filter is connected with the alternating current-direct current full-control bridge converter;
the direct current bus filter, the direct current power double-quadrant converter and the storage battery capacity balancing circuit are all connected with the microprocessor module;
the direct current bus filter is used for generating direct current bus capacitor voltage and transmitting the direct current bus capacitor voltage to the microprocessor module;
the direct-current power double-limit converter is used for generating storage battery current and transmitting the storage battery current to the microprocessor module;
the storage battery capacity equalization circuit is used for generating a storage battery voltage instantaneous value and transmitting the storage battery voltage instantaneous value to the microprocessor module.
Optionally, the single-phase alternating current power grid comprises a first hall voltage sensor, a first capacitor and a single-phase alternating current power supply;
the first capacitor is respectively connected with the single-phase alternating current power supply and the first Hall voltage sensor in parallel;
the first capacitor is connected with the AC/DC full-control bridge converter, and the first Hall voltage sensor is connected with the microprocessor module;
the first Hall voltage sensor is used for acquiring an alternating current grid voltage instantaneous value of the single-phase alternating current power supply and transmitting the alternating current grid voltage instantaneous value to the microprocessor module.
Optionally, the ac-dc full-control bridge converter further includes a first resistor, a first hall current sensor, and a first inductor;
the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first resistor is connected with the first end of the first Hall current sensor;
the second end of the first Hall current sensor is connected with the first end of the first inductor, and the second end of the first inductor and the second end of the first capacitor are both connected with the full-control switch diode module;
the full-control switch diode module is connected with the direct current bus filter in parallel;
the full-control switch diode module and the first Hall current sensor are connected with the microprocessor module;
the first Hall current sensor is used for acquiring the alternating-current side inductance current of the first inductor and transmitting the alternating-current side inductance current to the microprocessor module;
the full-control switch diode module is used for responding to the PWM charging control signal or the PWM discharging control signal sent by the microprocessor module to turn on or turn off.
Optionally, the dc bus filter includes a second inductor, a second resistor, a second capacitor, a dc bus capacitor, and a second hall voltage sensor;
The first end of the second inductor is connected with the first end of the direct current bus capacitor, and the second end of the second inductor is connected with the first end of the second resistor;
the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the direct current bus capacitor;
the direct current bus capacitor is respectively connected with the alternating current-direct current full-control bridge converter and the direct current power double-image limit converter in parallel;
the second Hall voltage sensor is connected with the microprocessor module;
the second Hall voltage sensor is used for acquiring the voltage of the direct-current bus capacitor and transmitting the voltage to the microprocessor module.
Optionally, the fully-controlled switching diode group comprises a first fully-controlled switching diode group and a second fully-controlled switching diode group; the direct-current power double-quadrant converter further comprises a third resistor, a third inductor and a second Hall current sensor;
the first end of the first full-control type switch diode group is connected with the first end of the direct current bus capacitor, and the second end of the first full-control type switch diode group is respectively connected with the first end of the third resistor and the first end of the second full-control type switch diode group;
The second end of the second full-control switch diode group is respectively connected with the second end of the direct current bus capacitor and the storage battery capacity balancing circuit, and the second end of the third resistor is connected with the first end of the third inductor;
the second end of the third inductor is connected with the first end of the second Hall current sensor, and the second end of the second Hall current sensor is connected with the storage battery capacity balancing circuit;
the first full-control type switch diode group, the second full-control type switch diode group and the second Hall current sensor are all connected with the microprocessor module;
the second Hall current sensor is used for acquiring the battery pack current of the battery pack capacity balancing circuit and transmitting the battery pack current to the microprocessor module;
the first full-control switch diode group is used for responding to the PWM charging control signal sent by the microprocessor module to turn on or turn off;
the second full-control switch diode group is used for responding to the PWM discharge control signal sent by the microprocessor module to be turned on or turned off.
Optionally, the storage battery capacity balancing circuit comprises a plurality of groups of storage battery switch circuits and a third hall voltage sensor, and each group of storage battery switch circuits comprises a third full-control switch, a cascade storage battery, a first full-control switch and a second full-control switch;
The first full-control switch, the second full-control switch and the third Hall voltage sensor are all connected with the microprocessor module;
the first full-control switch is connected with the second Hall current sensor in series;
the third full-control switch is connected in parallel between the storage battery and the first full-control switch;
the total number of the storage battery switch circuits is the same as the total number N of storage batteries corresponding to the storage battery capacity balancing circuits, the storage batteries are sequentially connected in series to form a storage battery pack, and the third Hall voltage sensor is connected in parallel with the storage battery pack;
the number of the storage batteries of each group of storage battery switch circuits is sequentially increased and is equal to the group number of the storage battery switch circuits, and the storage batteries are integers;
the third Hall voltage sensor is used for acquiring the voltage instantaneous value of the storage battery pack and transmitting the voltage instantaneous value to the microprocessor module.
Optionally, the preset charge control model includes a first charge control model and a second charge control model; the preset discharge control model comprises a first discharge control model and a second discharge control model; the PWM charging control signals comprise a first PWM charging control signal and a second PWM charging control signal; the PWM discharge control signals comprise a first PWM discharge control signal and a second PWM discharge control signal; the microprocessor module is specifically configured to:
Calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side inductance current;
when the direct current bus judges that the voltage meets a preset charging condition, substituting the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the alternating current power grid voltage average value of the single-phase alternating current power supply into a preset first charging function, and calculating a first charging modulation signal;
substituting the instantaneous value of the voltage of the storage battery into a preset second charging function, and calculating a second charging modulation signal;
inputting the first charging modulation signal, the direct-current bus capacitor voltage, the alternating-current side inductance current and the alternating-current power grid voltage instantaneous value into a first charging control model to generate a first PWM charging control signal;
inputting the second charging modulation signal, the battery voltage instantaneous value and the battery current into a second charging control model to generate a second PWM charging control signal;
when the direct current bus judging voltage meets a preset discharging condition, inputting the direct current bus capacitor voltage and the storage battery current into a first discharging control model to generate a first PWM discharging control signal and direct current bus discharging reference power;
Substituting the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the alternating current power grid voltage average value of the single-phase alternating current power supply into a preset first discharging function, and calculating a first discharging modulation signal;
and inputting the first discharge modulation signal, the alternating current grid voltage instantaneous value, the direct current bus discharge reference power and the alternating current side inductance current into a second discharge control model to generate a second PWM discharge control signal.
Optionally, the first charge control model includes a first voltage outer loop controller, a first current inner loop controller, a first trigger selector, a first comparator, and a first single-phase grid voltage phase-locked loop; the data processing process of the first charging control model specifically comprises the following steps:
inputting the alternating current power grid voltage instantaneous value into a first single-phase power grid voltage phase-locked loop, and outputting a first current unit amplitude value and a second current unit amplitude value;
subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a first direct current bus voltage difference value, inputting the first direct current bus voltage difference value to a first voltage outer ring controller, and outputting direct current bus charging reference power;
dividing the direct current bus charging reference power and the alternating current grid voltage effective value of the single-phase alternating current power supply to determine a first active component effective value, performing product operation with the second current unit amplitude, and outputting a first active current component;
Dividing the effective value of the alternating current power grid voltage of the single-phase alternating current power supply with the preset power grid reactive power to determine a first active component effective value, multiplying the first active component effective value with the first current unit amplitude to output a first active current component;
adopting the first active current component and the first active current component to perform addition operation, determining a first direct current bus operation current, performing subtraction operation with the alternating current side inductance current, and outputting a first error current;
inputting the first charging modulation signal and the alternating current grid voltage instantaneous value to a first trigger selector, and outputting a first target charging modulation signal;
inputting the first error current to a first current inner loop controller, outputting a first voltage signal, and performing addition operation with the first target charging modulation signal to determine a first target signal;
and inputting the first target signal and the preset triangular wave signal to a first comparator to generate a first PWM charging control signal.
Optionally, the second charge control model includes a second voltage outer loop controller, a second current inner loop controller, a second trigger selector, and a second comparator; the data processing process of the second charge control model specifically comprises the following steps:
Subtracting the preset reference voltage of the storage battery and the instantaneous value of the voltage of the storage battery, outputting a voltage difference value of the storage battery and inputting the voltage difference value of the storage battery to a second voltage outer ring controller, and determining the reference power of the storage battery;
inputting a preset storage battery reference current, the storage battery voltage difference value and the storage battery reference power into a second trigger selector, outputting target electrical data, performing subtraction operation with the storage battery current, and outputting an electrical parameter difference value;
inputting the electrical parameter difference value to a second current inner loop controller, outputting a second voltage signal, and performing addition operation with the second charging modulation signal to determine a second target signal;
and inputting the second target signal and the preset triangular wave signal to a second comparator to generate a second PWM charging control signal.
Optionally, the first discharge control model includes a third voltage outer loop controller, a third current inner loop controller, and a third comparator; the data processing process of the first discharge control model specifically comprises the following steps:
subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a second direct current bus voltage difference value, inputting the second direct current bus voltage difference value to a third voltage outer ring controller, and outputting direct current bus discharge reference power;
Substituting the direct current bus discharge reference power into a preset second discharge function, and calculating a second discharge modulation signal;
dividing the direct current bus discharging reference power and a preset storage battery reference voltage to determine storage battery operation current, subtracting the storage battery operation current from the storage battery current, and outputting a storage battery current difference;
inputting the current difference value of the storage battery pack to a third current inner loop controller, outputting a third voltage signal, and carrying out addition operation with the second discharge modulation signal to determine a third target signal;
and inputting the third target signal and the preset triangular wave signal to a third comparator to generate a first PWM discharge control signal.
Optionally, the second discharging control model includes a second single-phase grid voltage phase-locked loop, a fourth current inner loop controller, a fourth trigger selector, and a fourth comparator; the data processing process of the second discharge control model specifically comprises the following steps:
inputting the alternating current power grid voltage instantaneous value into a second single-phase power grid voltage phase-locked loop, and outputting a third current unit amplitude value and a fourth current unit amplitude value;
dividing the effective value of the alternating current power grid voltage of the single-phase alternating current power supply with the preset power grid reactive power to determine a second reactive component effective value, multiplying the second reactive component effective value with the third current unit amplitude to output a second reactive current component;
Dividing the reference power of the direct current bus and the effective value of the alternating current power grid voltage of the single-phase alternating current power supply, determining the effective value of a second active component, performing product operation with the fourth current unit amplitude, and outputting the second active current component;
adopting the second active current component and the second reactive current component to perform addition operation, determining a second direct current bus operation current, performing subtraction operation with the alternating current side inductance current, and outputting a second error current;
inputting the first discharge modulation signal and the alternating current grid voltage instantaneous value to a fourth trigger selector, and outputting a first target discharge modulation signal;
inputting the second error current to a fourth current inner loop controller, outputting a fourth voltage signal, and performing addition operation with the first target discharge modulation signal to determine a fourth target signal;
and inputting the fourth target signal and the preset triangular wave signal to a fourth comparator to generate a second PWM discharge control signal.
Optionally, the microprocessor module is further configured to:
when the direct current bus judges that the voltage meets a preset charging condition, comparing a storage battery voltage instantaneous value in the storage battery electrical data with a preset storage battery given voltage value;
If the voltage instantaneous value of the storage battery is smaller than the given voltage value of the preset storage battery, charging the storage battery in the storage battery capacity balancing circuit by adopting the storage battery current in the storage battery electrical data;
if the voltage instantaneous value of the storage battery pack is equal to the preset voltage value of the storage battery pack, respectively carrying out capacity calibration on each storage battery by adopting the charge state of each storage battery in the storage battery pack and the current of the storage battery pack based on a coulomb integration method, and controlling a first full-control switch, a second full-control switch and a third full-control switch in a capacity balancing circuit of the storage battery pack to be turned on or turned off;
when the direct current bus judges that the voltage meets the preset discharging condition, the direct current bus discharging reference power is input to a preset updating function to carry out iterative operation, and the number of initial basic batteries is determined;
when the number of the initial basic group batteries is equal to the total number of the storage batteries corresponding to the storage battery capacity balancing circuit, the current number of the initial basic group batteries is used as the number of the target basic group batteries, and the first full-control switch and the second full-control switch are controlled to be turned on.
The invention provides a storage battery pack balanced charge and discharge control method, which comprises the following steps:
when electric data of a storage battery, an alternating current power grid voltage instantaneous value and an alternating current side induction current are received, calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side induction current;
when the direct current bus judges that the voltage meets a preset charging condition, generating a PWM charging control signal according to a preset charging control model, the alternating current grid voltage instantaneous value, the alternating current side inductance current and the storage battery pack electrical data;
when the direct current bus judges that the voltage meets a preset discharging condition, generating a PWM discharging control signal according to a preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery pack electrical data; the PWM charging control signal and the PWM discharging control signal are used for controlling a full-control switch diode module in the AC/DC full-control bridge converter and a full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
From the above technical scheme, the invention has the following advantages:
The first aspect of the present invention provides a storage battery pack equalization charge-discharge control device, which includes a microprocessor module, a single-phase ac power grid, an ac-dc full-control bridge converter, and a storage battery pack circuit module; the two ends of the AC/DC full-control bridge converter are respectively connected with a single-phase AC power grid and the storage battery pack circuit module; the single-phase alternating current power grid is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module; the AC-DC full-control bridge converter is used for generating an AC side inductance current and transmitting the inductance current to the microprocessor module; the storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module; the microprocessor module is used for calculating a direct current bus judgment voltage by adopting an alternating current power grid voltage instantaneous value and an alternating current side inductance current, generating a PWM charging control signal according to a preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and storage battery electrical data when the direct current bus judgment voltage meets preset charging conditions, and generating a PWM discharging control signal according to the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets preset discharging conditions; the PWM charging control signal and the PWM discharging control signal are used for controlling a full-control switch diode module in the AC/DC full-control bridge converter and a full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off; according to the scheme, the alternating current power grid voltage instantaneous value and the alternating current side inductance current are adopted, the direct current bus judgment voltage is calculated, when the direct current bus judgment voltage meets the preset charging condition or the preset discharging condition, the corresponding PWM charging control signal or PWM discharging control signal is generated based on the preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data or the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data, and then the fully-controlled switch diode module and the fully-controlled switch diode group are controlled to be turned on or turned off according to the PWM charging control signal or the PWM discharging control signal, and shunt is not needed when a resistor is connected to each battery in parallel for charging, so that stable storage battery voltage and charging current are obtained, and the service life of the storage battery is further prolonged.
According to the technical scheme, the second aspect of the invention provides a storage battery balanced charge-discharge control method, when electric data of the storage battery, an alternating current power grid voltage instantaneous value and an alternating current side inductance current are received, the alternating current power grid voltage instantaneous value and the alternating current side inductance current are adopted to calculate a direct current bus judgment voltage; when the direct current bus judges that the voltage meets the preset charging condition, generating a PWM charging control signal according to a preset charging control model, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and electric data of the storage battery; when the direct current bus judges that the voltage meets the preset discharging condition, generating PWM discharging control signals according to a preset discharging control model, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and electric data of a storage battery pack, wherein the PWM charging control signals and the PWM discharging control signals are used for controlling a full-control switch diode module in an alternating current-direct current full-control bridge converter and a full-control switch diode group in a direct current power double-quadrant converter to be turned on or turned off; according to the scheme, the alternating current power grid voltage instantaneous value and the alternating current side inductance current are adopted, the direct current bus judgment voltage is calculated, when the direct current bus judgment voltage meets the preset charging condition or the preset discharging condition, the corresponding PWM charging control signal or PWM discharging control signal is generated based on the preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data or the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data, and then the full-control switch diode module and the full-control switch diode group are controlled to be turned on or off according to the PWM charging control signal or the PWM discharging control signal.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a battery pack equalization charge-discharge control device according to a first embodiment of the present invention;
fig. 2 is a schematic structural diagram of a first charge control model according to an embodiment of the present invention;
fig. 3 is a schematic structural diagram of a single-phase power grid voltage phase-locked loop according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a second charge control model according to a first embodiment of the present invention;
FIG. 5 is a schematic diagram of a first discharge control model according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of a second discharge control model according to an embodiment of the present invention;
FIG. 7 is a control flow diagram of battery capacity calibration according to an embodiment of the present invention;
FIG. 8 is a control flow diagram of a basic battery pack configuration according to a first embodiment of the present invention;
Fig. 9 is a flowchart illustrating steps of a method for controlling balanced charge and discharge of a storage battery according to a second embodiment of the present invention.
Wherein the reference numerals have the following meanings:
1. a single phase ac power grid; 2. an AC/DC full-control bridge converter; 3. an RLC filter; 4. a direct current bus capacitor; 5. a DC power double-quadrant converter; 6. a battery capacity equalization circuit; 7. a battery pack; 8. a first hall voltage sensor; 9. a first hall current sensor; 10. a second hall voltage sensor; 11. a second hall current sensor; 12. and a third hall voltage sensor.
Detailed Description
The embodiment of the invention provides a storage battery balanced charge and discharge control device and method, which are used for solving the technical problem that the service life of a storage battery is short because stable storage battery voltage and charging current cannot be obtained by shunting current when charging is carried out by connecting resistors in parallel on each battery in the existing storage battery main balanced mode.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
High-voltage battery packs and charging devices thereof are the main focus of high-power energy storage at present. However, a high-power cascade battery will suffer from a charge imbalance due to small differences between the batteries. Charge equalization between batteries is indispensable for improving the cycle life of the batteries, obtaining reliable energy and stable system performance. Therefore, it is important to develop a charger having a charge balance function. In addition, under the basic requirements of new energy power generation systems and electric automobiles, bidirectional power flow and reactive power control are also important functions that a battery charger should have. Therefore, the application provides a storage battery balanced charge-discharge control device, which designs a battery charger with two running modes and a control scheme based on the charger, so that the active and passive control capability of power bidirectional interaction between a power grid and a storage battery is realized, the overall performance of a storage battery system and the service life cycle of the battery are improved, and a control algorithm of charge balance under a constant current mode is discussed.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack equalization charge-discharge control device according to an embodiment of the invention.
The invention provides a storage battery balanced charge and discharge control device, which comprises a microprocessor module, a single-phase alternating current power grid 1, an alternating current-direct current full-control bridge converter 2 and a storage battery circuit module, wherein the microprocessor module is connected with the single-phase alternating current power grid; two ends of the AC/DC full-control bridge converter 2 are respectively connected with the single-phase AC power grid 1 and the storage battery pack circuit module; the single-phase alternating current power grid 1, the alternating current-direct current full-control bridge converter 2 and the storage battery pack circuit module are all connected with the microprocessor module;
referring to fig. 1, it should be noted that the ac/dc full-control bridge converter 2, the dc power double-limit converter 5 in the battery pack circuit module, and the battery capacity balancing circuit form a power bidirectional converter, where the battery pack circuit module further includes a dc bus filter and a battery capacity balancing circuit 6, and the dc bus filter includes a dc bus capacitor 4 (C dc ) And RLC filter 3, RLC filter 3 is defined by C 2 、L 2 And r 2 The power bidirectional converter can operate in a grading manner according to different modes (a charging mode and a discharging mode), wherein the first stage is an alternating current-direct current full-control bridge converter (alternating current-direct current full-control H-bridge converter), and the second stage is a direct current power double-quadrant converter (direct current-direct current power double-quadrant converter), and the two converters are arranged in a grading manner The secondary ripple of the bus can be effectively filtered through a large direct current bus (direct current bus capacitor 4) and connected with the RLC filter in parallel, and the third stage is a storage battery capacity balancing circuit (Capacity Balancing Circuit) which is formed by all the full-control type switches (a first full-control type switch, a second full-control type switch and a third full-control type switch) in the storage battery capacity balancing circuit 6. Based on the storage battery charge-discharge system topological structure (shown in fig. 1) of the storage battery balanced charge-discharge control device, three-level power with a charge balance function is controllable in two directions, and the storage battery charge balance structure of the storage battery capacity balance circuit can be suitable for any number of storage battery packs according to actual requirements.
The single-phase alternating current power grid 1 is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module;
the single-phase ac power grid 1 includes a first hall voltage sensor 8 and a first capacitor C 1 And the single-phase alternating current power supply AC acquires an alternating current grid voltage instantaneous value of the single-phase alternating current power supply through the first Hall voltage sensor 8 and transmits the alternating current grid voltage instantaneous value to the microprocessor module.
The AC-DC full-control bridge converter is used for generating an AC side inductance current and transmitting the inductance current to the microprocessor module;
It should be noted that the ac/dc full-control bridge converter includes a full-control switch diode module, a first resistor r 1 A first hall current sensor 9 and a first inductance L 1 The fully-controlled switch diode module consists of four fully-controlled switch diode groups, namely a third fully-controlled switch diode group S b1 Fourth full-control switch diode group S b2 Fifth full-control switch diode group S a1 And a sixth fully-controlled switching diode group S a2 Wherein, the third fully-controlled switch diode group S b1 Second and fourth fully-controlled switch diode group S b2 The first end of the first capacitor is connected to the third fully-controlled switch diode group S b1 Fourth full-control switch diode group S b2 Between, a fifth fully-controlled switch diode group S a1 Second and sixth fully controlled switching diodes of (a)Group S a2 The second end of the first inductor is connected to the fifth fully-controlled switch diode group S a1 Sixth full-control switch diode group S a2 Between, a third fully-controlled switch diode group S b1 First and fifth fully-controlled switch diode group S a1 A fourth fully-controlled switching diode group S connected to the first end of b2 Second and sixth fully-controlled switch diode group S a2 A fifth fully-controlled switching diode group S connected to the second terminal of (a) a1 Is a first and sixth fully controlled switching diode group S a2 The second ends of the first and second switches are connected with the direct current bus filter; the full-control switch diode group consists of a full-control switch and a diode, wherein the diode is connected in parallel with the full-control switch and then connected with other devices through two ends of the full-control switch.
Further, the ac side inductor current of the first inductor is obtained by the first hall current sensor 9 and transmitted to the microprocessor module.
The storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module;
the battery pack electrical data includes a battery pack voltage instantaneous value, a direct current bus capacitor voltage, and a battery pack current.
The storage battery pack circuit module comprises a direct current bus filter, a direct current power double-phase limit converter 5 and a storage battery pack capacity balancing circuit 6.
It should be noted that the dc bus filter includes a second inductor L 2 Second resistor r 2 A second capacitor C 2 DC bus capacitor C dc And a second Hall voltage sensor, wherein the second inductance L 2 Second resistor r 2 A second capacitor C 2 Form RLC filter 3, DC bus capacitor C dc A large direct current bus is formed by the lead wire; the voltage of the direct current bus capacitor is obtained through the second Hall voltage sensor 10 and transmitted to the microprocessor module.
Further, the dc power double-quadrant converter 5 includes a fully-controlled switching diode group, a third resistor r 3 Third inductance L 3 And a second hall current sensor 11 in which the fully-controlled switching diode group includes a first fully-controlled switching diode group S H And a second fully-controlled switching diode group S L The method comprises the steps of carrying out a first treatment on the surface of the The battery current of the battery capacity balancing circuit is acquired by the second hall current sensor 11 and transmitted to the microprocessor module.
Further, the battery capacity equalization circuit 6 includes a plurality of groups of battery switch circuits and a third hall voltage sensor 12, wherein each group of battery switch circuits includes a third fully-controlled switch, and a cascaded battery, a first fully-controlled switch, and a second fully-controlled switch; the instantaneous value of the battery voltage of the battery pack formed by sequentially connecting the batteries in the battery pack capacity equalization circuit 6 in series is acquired by the third Hall voltage sensor 12 and transmitted to the microprocessor module. Wherein n-1 third full-control type switches (s2+,., sn+), one first full-control type switch (s1+, second full-control type switch) are provided in the battery capacity balancing circuit 6, and n second full-control type switches (s1_,., sn_);
The microprocessor module is used for calculating a direct current bus judgment voltage by adopting an alternating current power grid voltage instantaneous value and an alternating current side inductance current, generating a PWM charging control signal according to a preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and storage battery electrical data when the direct current bus judgment voltage meets preset charging conditions, and generating a PWM discharging control signal according to the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets preset discharging conditions;
the PWM charging control signal and the PWM discharging control signal are used for controlling the full-control switch diode module in the AC/DC full-control bridge converter and the full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
The preset charge control model includes a first charge control model and a second charge control model.
The preset discharge control model includes a first discharge control model and a second discharge control model.
The PWM (Pulse Width Modulation, pulse width modulated) charge control signal includes a first PWM charge control signal and a second PWM charge control signal.
The PWM discharge control signal includes a first PWM discharge control signal and a second PWM discharge control signal.
And if the preset charging condition is that the direct current bus judgment voltage is greater than or equal to 0, the direct current bus judgment voltage is indicated to meet the preset charging condition.
The preset discharge condition is that if the direct current bus judgment voltage is smaller than 0, the direct current bus judgment voltage is indicated to meet the preset discharge condition.
Firstly, calculating a direct current bus judgment voltage by adopting an alternating current power grid voltage instantaneous value and an alternating current side inductance current, substituting an alternating current power grid voltage average value of the alternating current power grid voltage instantaneous value, the alternating current side inductance current and a single-phase alternating current power supply into a preset first charging function to calculate a first charging modulation signal, wherein the first charging modulation signal comprises a charging modulation signal of a sixth fully-controlled switch diode group and a charging modulation signal of a fourth fully-controlled switch diode group, and obtaining the charging modulation signal of the sixth fully-controlled switch diode group based on the alternating current power grid voltage average value when the alternating current power grid voltage instantaneous value and the alternating current side inductance current are both larger than 0; when the alternating current power grid voltage instantaneous value and the alternating current side inductance current are smaller than 0, a charging modulation signal of a fourth full-control switch diode group can be obtained based on the alternating current power grid voltage average value; substituting the voltage instantaneous value of the storage battery into a preset second charging function to calculate a second charging modulation signal, wherein the second charging modulation signal is specifically a first full-control switch diode group S H Is provided; presetting a first charging function, specifically:
wherein v is mod-sa2 A charging modulation signal for the sixth fully-controlled switching diode group; v mod-sb2 A charging modulation signal for the fourth fully-controlled switching diode group; v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref Presetting a direct current bus reference voltage; v (V) tri Presetting carrier signal amplitude; u (u) s Is an instantaneous value of the ac grid voltage; i.e L1 Is an ac side inductor current.
Presetting a second charging function, specifically:
wherein,is a first fully-controlled switch diode group S H Is provided; u (u) b A battery voltage instantaneous value; v (V) ref Presetting a direct current bus reference voltage; v (V) tri For presetting the carrier signal amplitude.
Further, a first charging modulation signal, a direct current bus capacitor voltage, an alternating current side inductance current and an alternating current power grid voltage instantaneous value are input into a first charging control model to generate a first PWM charging control signal, wherein the first charging control model is a control model of an alternating current-direct current full-control H-bridge converter in a charging state, voltage-current double closed loop PI control is adopted, stable direct current bus voltage and power grid current with low harmonic content can be obtained, the method comprises a first voltage outer loop controller, a first current inner loop controller, a first trigger selector, a first comparator and a first single-phase power grid voltage phase-locked loop, and the data processing process of the first charging control model is as follows:
Referring to fig. 2, (1) is voltage outer loop control, for preset dc bus reference voltage V ref And a DC bus capacitor voltage u dc Subtracting, determining a first DC bus voltage difference, inputting the first DC bus voltage difference to the first voltage outer ring controller, and outputting DC bus charging reference power (DC bus reference power P in charging state) ref ) The method comprises the steps of carrying out a first treatment on the surface of the Instantaneous value u of AC network voltage s Input to a first single-phase grid voltage phase-locked loop, and output a first current unit amplitude i α And a second current unit amplitude i β The method comprises the steps of carrying out a first treatment on the surface of the (5) For calculating the effective value of the active current, charging reference power for a direct current bus and the effective value V of the voltage of an alternating current power grid of a single-phase alternating current power supply x Dividing operation is carried out, a first active component effective value (active component effective value of a current signal) is determined, product operation is carried out on the first active component effective value and a second current unit value, and a first active current component is output; (4) for calculating reactive current effective value, alternating current network voltage effective value V of single-phase alternating current power supply is adopted x And preset reactive power value Q of power grid 0 Dividing (reactive power reference value set by power grid), determining effective value of first passive component and comparing it with first current unit amplitude value i α Performing product operation and outputting a first active current component; (2) for current inner loop control, the sum of the first active current component and the first active current component, i.e. the first DC bus operation current i ref The first error current is taken as an input signal of a current PI controller, so as to output a first voltage signal; (3) for ac network voltage instantaneous value u s Positive and negative selection v mod-sa2 Or v mod-sb2 I.e. v mod-sa2 、v mod-sb2 Inputting the voltage instantaneous value of the alternating current power grid and the voltage instantaneous value of the alternating current power grid into a first trigger selector, and if the voltage instantaneous value of the alternating current power grid is more than or equal to 0, inputting v mod-sa2 As a first target charging modulation signal, outputting v if the instantaneous value of the AC network voltage is less than 0 mod-sb2 As a first target charge modulation signal and output; finally, adding the first voltage signal and the first target charging modulation signal to determine a first target signal; inputting a first target signal and a preset triangular wave signal (triangular waveform) to a first comparator to generate a first PWM charging control signal, specifically, outputting a current PI controller and a first target charging toneThe sum of the control signals is compared with the triangular waveform to obtain a PWM control signal, namely, a first target signal and the triangular waveform are input to the first comparator together, if the first target signal is smaller than the triangular waveform, a low level 0 is output as a first PWM charging control signal, and if the first target signal is larger than or equal to the triangular waveform, a high level 1 is output as a first PWM charging control signal, wherein the first PWM charging control signal is used for controlling the on or off of the fourth full-control switch diode group Sb2 and the sixth full-control switch diode group Sa 2.
Further, referring to fig. 3, in order to realize active power and reactive power control of the power grid, the present application needs to perform phase locking on the power grid voltage, and obtain the phase ω of the ac power grid voltage after passing through a single-phase power grid voltage phase-locked loop t And generating a current unit amplitude i with unit amplitude after sine and cosine α And current unit amplitude i β The two are respectively used as the direct current bus operation current i ref Active and reactive component basis values of (a).
In the present embodiment, the ac grid voltage average V of the single-phase ac power supply s The voltage effective value V of the alternating current power grid of the single-phase alternating current power supply can be obtained through a Hall sensor according to a preset carrier period x Can be obtained by a Hall sensor, and the voltage average value V of an alternating current power grid s And an ac mains voltage effective value V x The detection may be performed by other conventional detection means, and is not particularly limited herein.
Further, a second charging modulation signal, a voltage instantaneous value of the storage battery and a current of the storage battery are input to a second charging control model to generate a second PWM charging control signal, wherein the second charging control model is a control model of the direct current-direct current power double-quadrant converter in a charging state, a control mode of combining voltage-current double-closed loop control and constant current control is adopted, and stable storage battery voltage and charging current can be obtained, the method comprises a second voltage outer loop controller, a second current inner loop controller, a second trigger selector and a second comparator, and a data processing process of the second charging control model is as follows:
Referring to fig. 4, (1) is a reference voltage V for a preset battery pack bref And instantaneous value u of battery voltage b Performing difference to obtain a voltage difference value of the storage battery pack, inputting the voltage difference value to a second voltage outer ring controller, determining the reference power of the storage battery pack and taking the reference power as the input of a second trigger selector; (2) to preset the reference current I of the storage battery bref The storage battery voltage difference value and the storage battery reference power are input into the second trigger selector together, if the storage battery reference power is greater than or equal to 0, the preset storage battery reference current is used as target electrical data and output, and if the storage battery reference power is less than 0, the storage battery voltage difference value is used as target electrical data and output; (3) in order to take the difference between the output target electrical data and the current of the storage battery, namely the electrical parameter difference value, as the input of the second current inner loop controller, the second voltage signal and the second charging modulation signal v are obtained after the processing of the second current inner loop controller mod2 I.e. first fully-controlled switching diode group S H Charging modulation signal of (a)Performing addition operation to determine a second target signal; inputting a second target signal and a preset triangular wave signal into a second comparator for comparison, outputting a low level 0 as a second PWM charging control signal if the second target signal is smaller than the triangular wave, and outputting a high level 1 as a second PWM charging control signal if the second target signal is larger than or equal to the triangular wave, wherein the second PWM charging control signal is used for controlling a first fully-controlled switch diode group S H On or off.
Further, if the dc bus voltage meets the preset discharging condition, inputting the dc bus capacitor voltage and the battery current to a first discharging control model to generate a first PWM discharging control signal and a dc bus discharging reference power, where the first discharging control model is a control model of the dc-dc power double-limit converter in a discharging state, and is used to stabilize the dc bus voltage, and includes a third voltage outer loop controller and a third current inner loop controllerThe voltage and current double closed-loop control is adopted by the controller and the third comparator, so that the voltage of the direct current bus can be stabilized at V ref The obtained feedforward signal v mod3 I.e. second fully-controlled switching diode group S L The discharge modulation signal of the first discharge control model is used as a control signal together with the output of the current loop, and the data processing process of the first discharge control model specifically comprises the following steps:
referring to fig. 5, a reference voltage V is preset for a dc bus ref And a DC bus capacitor voltage u dc Subtracting, determining the voltage difference of the second DC bus, inputting to the third voltage outer ring controller, and outputting DC bus discharge reference power (DC bus reference power P in discharge state) ref ) The method comprises the steps of carrying out a first treatment on the surface of the Substituting the reference power of the DC bus discharge into a preset second discharge function to calculate a second discharge modulation signal (feedforward signal v mod3 I.e. second fully-controlled switching diode group S L Is a discharge modulation signal of (a); discharging reference power to direct current bus and presetting reference voltage V of storage battery bref Dividing operation is carried out, and the operation current of the storage battery is determined and is combined with the acquired current i of the storage battery b Performing subtraction operation to output a current difference value of the storage battery pack; inputting the current difference value of the storage battery pack to a third current inner loop controller, outputting a third voltage signal, and carrying out addition operation with the second discharge modulation signal to determine a third target signal; inputting a third target signal and a preset triangular wave signal into a third comparator for comparison, outputting a low level 0 as a first PWM discharge control signal if the third target signal is smaller than the triangular waveform, and outputting a high level 1 as a first PWM discharge control signal if the third target signal is larger than or equal to the triangular waveform, wherein the first PWM discharge control signal is used for controlling a second fully-controlled switch diode group S L Is turned on or off; presetting a second discharge function, specifically:
wherein v is mod3 Modulating the signal for a second discharge; p (P) ref Reference for discharging DC busA power; i bref Presetting a reference current of a storage battery; v (V) ref Presetting a direct current bus reference voltage; v (V) tri For presetting the carrier signal amplitude.
Further, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and an alternating current power grid voltage average value of a single-phase alternating current power supply are substituted into a preset first discharging function, a first discharging modulation signal is calculated, and a fifth full-control switch diode group S is controlled a1 And a sixth fully-controlled switching diode group S a2 All are turned on, wherein the first discharge modulation signal comprises a third fully-controlled switch diode group S b1 Discharge modulation signal of (a) and fourth fully-controlled switching diode group S b2 When the instantaneous value of the AC power grid voltage is greater than 0 and the inductance current at the AC side is less than 0, the fourth full-control switch diode group S can be obtained based on the average value of the AC power grid voltage b2 When the instantaneous value of the AC power grid voltage is smaller than 0 and the inductance current at the AC side is larger than 0, the third fully-controlled switch diode group S can be obtained based on the average value of the AC power grid voltage b1 A first discharging function is preset, specifically:
wherein S is a1 A fifth fully-controlled switch diode group; s is S a2 A sixth fully-controlled switch diode group; v mod-sb2 Is a fourth fully-controlled switch diode group S b2 Is a discharge modulation signal of (a); v mod-sb1 Is a third fully-controlled switch diode group S b1 Is a discharge modulation signal of (a); v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref Presetting a direct current bus reference voltage; v (V) tri Presetting carrier signal amplitude; u (u) s Is an instantaneous value of the ac grid voltage; i.e L1 For communicationSide inductor current.
Further, the first discharge modulation signal, an alternating current grid voltage instantaneous value, a direct current bus discharge reference power and an alternating current side inductance current are input into a second discharge control model to generate a second PWM discharge control signal, wherein the second discharge control model is a control model of the alternating current-direct current full control H-bridge converter in a discharge state and is used for controlling grid side current, and v is obtained mod-sb2 、v mod-sb1 The feedforward compensation is added into double closed-loop control, so that the control capability of a controller can be enhanced, the response capability of voltage and current regulation is improved, and the current ripple is effectively reduced, and the feedforward compensation comprises a second discharge control model, a third discharge control model and a fourth discharge control model, wherein the second discharge control model comprises a second single-phase power grid voltage phase-locked loop, a fourth current inner loop controller, a fourth trigger selector and a fourth comparator, and the data processing process of the second discharge control model specifically comprises the following steps:
referring to fig. 6, an ac grid voltage instantaneous value is input to a second single-phase grid voltage phase-locked loop, and a third current unit amplitude value and a fourth current unit amplitude value are output; dividing an alternating current power grid voltage effective value of a single-phase alternating current power supply and preset power grid reactive power to determine a second reactive component effective value, multiplying the second reactive component effective value by a third current unit amplitude value, and outputting a second reactive current component; dividing the reference power of the DC bus discharge and the effective value of the AC grid voltage of the single-phase AC power supply, determining the effective value of the second active component, multiplying the effective value of the second active component by the fourth current unit amplitude, and outputting the second active current component; adopting a second active current component and a second reactive current component to carry out addition operation, determining a second direct current bus operation current, carrying out subtraction operation with an alternating current side inductance current, and outputting a second error current; will v mod-sb2 、v mod-sb1 Inputting the instantaneous value of the AC power grid voltage into a fourth trigger selector, and if the instantaneous value of the AC power grid voltage is more than or equal to 0, inputting v mod-sb1 As a first target discharge modulation signal, and outputting, if the instantaneous value of the AC network voltage is less than 0, v mod-sb2 Discharging the modulated signal as a first target and outputting the modulated signal; inputting the second error current to a fourth current inner loop controller, outputting a fourth voltage signal andthe first target discharge modulation signal is subjected to addition operation, and a fourth target signal is determined; inputting a fourth target signal and a preset triangular wave signal into a fourth comparator, outputting a low level 0 as a second PWM discharge control signal if the fourth target signal is smaller than the triangular wave, and outputting a high level 1 as a second PWM discharge control signal if the fourth target signal is larger than or equal to the triangular wave, wherein the second PWM discharge control signal is used for controlling a third fully-controlled switch diode group S b1 And fourth full-control switch diode group S b2 Is turned on or off.
As a further improvement, the battery pack circuit module comprises a direct current bus filter, a direct current power double-limit converter 5 and a battery pack capacity balancing circuit 6;
two ends of the direct current power double-phase limit converter 5 are respectively connected with a direct current bus filter and a storage battery capacity equalization circuit 6; the direct current bus filter is connected with the alternating current-direct current full-control bridge converter 5; the direct current bus filter, the direct current power double-phase limit converter 5 and the storage battery capacity equalization circuit 6 are connected with the microprocessor module;
The direct current bus filter is used for generating direct current bus capacitor voltage and transmitting the direct current bus capacitor voltage to the microprocessor module; the direct-current power double-quadrant converter 5 is used for generating storage battery current and transmitting the storage battery current to the microprocessor module; the battery capacity equalization circuit 6 is used for generating the battery voltage instantaneous value and transmitting the battery voltage instantaneous value to the microprocessor module.
As a further improvement, the single-phase ac power grid 1 comprises a first hall voltage sensor 8, a first capacitor and a single-phase ac power supply;
the first capacitor is respectively connected with the single-phase alternating current power supply and the first Hall voltage sensor 8 in parallel; the first capacitor is connected with the AC/DC full-control bridge converter 2, and the first Hall voltage sensor 8 is connected with the microprocessor module;
the first hall voltage sensor 8 is used for acquiring an ac grid voltage instantaneous value of the single-phase ac power supply and transmitting the ac grid voltage instantaneous value to the microprocessor module.
As a further improvement, the ac-dc full-control bridge converter 8 further comprises a first resistor, a first hall current sensor 9 and a first inductor;
the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first resistor is connected with the first end of the first Hall current sensor 9; the second end of the first Hall current sensor 9 is connected with the first end of the first inductor, and the second end of the first inductor and the second end of the first capacitor are both connected with the full-control switch diode module; the full-control switch diode module is connected with the direct current bus filter in parallel; the full-control switch diode module and the first Hall current sensor 9 are connected with the microprocessor module;
The first hall current sensor 9 is used for acquiring an alternating-current side inductance current of the first inductor and transmitting the inductance current to the microprocessor module;
the full-control switch diode module is used for responding to the PWM charging control signal or the PWM discharging control signal sent by the microprocessor module to turn on or off.
As a further improvement, the dc bus filter includes a second inductor, a second resistor, a second capacitor, a dc bus capacitor 4, and a second hall voltage sensor 10;
the first end of the second inductor is connected with the first end of the direct current bus capacitor 4, and the second end of the second inductor is connected with the first end of the second resistor; the second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the direct current bus capacitor; the direct current bus capacitor 4 is respectively connected with the alternating current-direct current full-control bridge converter 2 and the direct current power double-quadrant converter 5 in parallel; the second Hall voltage sensor 10 is connected with the microprocessor module;
the second hall voltage sensor 10 is configured to obtain a dc bus capacitor voltage of the dc bus capacitor 4 and transmit the dc bus capacitor voltage to the microprocessor module.
As a further improvement, the fully-controlled switching diode group includes a first fully-controlled switching diode group and a second fully-controlled switching diode group; the direct-current power double-limit converter 5 further comprises a third resistor, a third inductor and a second Hall current sensor 11;
The first end of the first full-control type switch diode group is connected with the first end of the direct-current bus capacitor 4, and the second end of the first full-control type switch diode group is respectively connected with the first end of the third resistor and the first end of the second full-control type switch diode group; the second end of the second full-control switch diode group is respectively connected with the second end of the direct-current bus capacitor 4 and the storage battery capacity balancing circuit 6, and the second end of the third resistor is connected with the first end of the third inductor; the second end of the third inductor is connected with the first end of the second Hall current sensor 11, and the second end of the second Hall current sensor 11 is connected with the storage battery capacity balancing circuit 6; the first full-control type switch diode group, the second full-control type switch diode group and the second Hall current sensor 11 are all connected with the microprocessor module;
the second hall current sensor 11 is used for acquiring the battery pack current of the battery pack capacity balancing circuit 6 and transmitting the battery pack current to the microprocessor module;
the first full-control switch diode group is used for responding to the PWM charging control signal sent by the microprocessor module to turn on or turn off;
the second full-control type switch diode group is used for responding to the PWM discharge control signal sent by the microprocessor module to turn on or turn off.
As a further improvement, the battery capacity equalization circuit 6 includes a plurality of groups of battery switch circuits and a third hall voltage sensor 12, each group of battery switch circuits including a third full-control type switch and a cascade battery, a first full-control type switch, a second full-control type switch;
the first full-control switch, the second full-control switch and the third Hall voltage sensor 12 are all connected with the microprocessor module; the first fully-controlled switch is connected with the second Hall current sensor 11 in series; the third full-control switch is connected in parallel between the storage battery and the first full-control switch;
the total number of the storage battery switch circuits is the same as the total number N of the storage batteries corresponding to the storage battery capacity balancing circuits, the storage batteries are sequentially connected in series to form a storage battery 7, and a third Hall voltage sensor 12 is connected in parallel with the storage battery 7; the number of the storage batteries of each group of storage battery switch circuits is sequentially increased and is equal to the group number of the storage battery switch circuits, N is more than or equal to 1 and less than or equal to N, and N is an integer;
the third hall voltage sensor 12 is used for acquiring the instantaneous value of the battery voltage of the battery and transmitting the instantaneous value to the microprocessor module.
It should be noted that, the battery capacity equalization circuit 6 is composed of a plurality of groups of battery switch circuits and a third hall voltage sensor 12, each group of battery switch circuits is composed of a third fully-controlled switch, a battery, a first fully-controlled switch and a second fully-controlled switch, the number of the batteries of each group of battery switch circuits is sequentially increased and is equal to the group number of the battery switch circuits, and the total group number of the battery switch circuits is the same as the total number N of the batteries corresponding to the battery capacity equalization circuit 6; for example, assuming that the total number of groups of the battery switch circuits is 10, and the total number N of batteries corresponding to the battery capacity balancing circuit 6 is also 10, the first group of battery switch circuits is composed of one battery, a first fully-controlled switch s1+, a second fully-controlled switch s1+ and a third fully-controlled switch s2+, and the connection relationship is that one battery, the first fully-controlled switch s1+, the second fully-controlled switch s1+ and the third fully-controlled switch s2+ are connected in parallel between one battery and the first fully-controlled switch s1+; the second group of storage battery switching circuits consists of two storage batteries, a first full-control switch S1+, a second full-control switch S2+ and a third full-control switch S3+, wherein the connection relationship of the two storage batteries, the first full-control switch S1+, the second full-control switch S2+ and the third full-control switch S3+ is cascade connection between the two storage batteries and the first full-control switch S1+.
As a further improvement, the preset charge control model includes a first charge control model and a second charge control model; the preset discharge control model comprises a first discharge control model and a second discharge control model; the PWM charging control signals comprise a first PWM charging control signal and a second PWM charging control signal; the PWM discharge control signals comprise a first PWM discharge control signal and a second PWM discharge control signal; the microprocessor module is specifically used for:
calculating the judgment voltage of a direct current bus by adopting an alternating current power grid voltage instantaneous value and an alternating current side inductance current; when the direct current bus judges that the voltage meets the preset charging condition, substituting an alternating current power grid voltage instantaneous value, an alternating current side inductance current and an alternating current power grid voltage average value of the single-phase alternating current power supply into a preset first charging function, and calculating a first charging modulation signal; substituting the voltage instantaneous value of the storage battery into a preset second charging function, and calculating a second charging modulation signal; inputting a first charging modulation signal, a direct current bus capacitor voltage, an alternating current side inductance current and an alternating current power grid voltage instantaneous value into a first charging control model to generate a first PWM charging control signal; inputting the second charging modulation signal, the battery voltage instantaneous value and the battery current into a second charging control model to generate a second PWM charging control signal; when the direct current bus judges that the voltage meets the preset discharging condition, the direct current bus capacitor voltage and the storage battery current are input into a first discharging control model to generate a first PWM discharging control signal and direct current bus discharging reference power; substituting an alternating current power grid voltage instantaneous value, an alternating current side inductance current and an alternating current power grid voltage average value of a single-phase alternating current power supply into a preset first discharging function, and calculating a first discharging modulation signal; and inputting the first discharge modulation signal, the alternating current grid voltage instantaneous value, the direct current bus discharge reference power and the alternating current side inductance current into a second discharge control model to generate a second PWM discharge control signal.
It should be noted that, according to the power direction of charging and discharging of the storage battery, the balanced charging and discharging control of the storage battery provided by the application is divided into two operation modes: a charge state (mode) and a discharge state, i.e., an H-bridge rectification mode (the grid charges the battery) and an H-bridge inversion mode (the battery discharges to the grid); in a charging state, an alternating current power grid charges a storage battery pack, a DC/AC converter (alternating current-direct current full-control H-bridge converter) boosts and rectifies the voltage to stabilize direct current voltage, the DC/DC converter (direct current-direct current power double-image limit converter) is used as a controlled current source to perform voltage reduction operation, power is supplied to the storage battery pack, and a CBC circuit (storage battery capacity balancing circuit) performs capacity calibration on each storage battery in the storage battery pack.
Further, in the charging state, the switching state of the ac-dc fully-controlled H-bridge converter is analyzed, and the application adopts the voltage of the single-phase power grid, assuming the ac side inductance L 1 Is large enough to ignore the inductance resistance r 1 Simultaneously controlling the synchronization of the grid current and the grid voltage to realize that the grid-side power factor is lambda=1; when us is>0、i L1 >At 0, at first, S a2 Conduction, S a1 、S b1 、S b2 And (5) switching off. According to kirchhoff's voltage law, the relationship of voltages at this time is:
Wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a function of the inductance value of the capacitor.
Further, due to L 1 The voltage is u s Thus i L1 Increase, L 1 In a charged state. Subsequently, S a1 、S a2 、S b1 、S b2 All are turned off, i L1 Through S a1 、S b2 The freewheeling diode flows to the second stage, where the voltage relationship is:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a value of inductance of (a); u (u) dc Is the voltage of the DC bus capacitor.
Based on the above, L 1 The voltage is u s -u dc ，L 1 In a discharge state. When u is s ＜0、i L1 When < 0, S b2 Open, S a2 、S a1 、S b1 Shut off, i L1 Through S b2 Switch and S a2 Freewheeling diode, thereby obtaining:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a function of the inductance value of the capacitor.
Based on the above, S a1 、S a2 、S b1 、S b2 All are turned off, i L1 Through S a2 、S b1 The freewheeling diode flows to the second stage, and the kirchhoff voltage relationship is:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a value of inductance of (a); u (u) dc Is the voltage of the DC bus capacitor.
Further, L 1 The voltage is u s +u dc Let i L1 Increase, L 1 Is in a charged state; define Don as the on-duty of the switch, D on ＝t on /T，t on The switch is turned on for a time period of T carrier wave, and a switch signal S is arranged when the switch is turned on on =1, duty cycle when the switch is off D off ＝1-D on At this time S on =0. Table one is the H-bridge switch state table:
list H bridge switch state list (λ=1)
Based on the above, according to Table I, when the H-bridge is operating in rectifying mode, in u s >0、i L1 >At 0, L 1 Charging S a1 、S a2 、S b1 、S b2 Correspond to S on ＝(0100)，L 1 Discharge S a1 、S a2 、S b1 、S b2 Correspond to S on = (0 0 0 0); in u s ＜0、i L1 When < 0, L 1 Discharge S a1 、S a2 、S b1 、S b2 Correspond to S on ＝(0 0 0 1)，L 1 Charging S a1 、S a2 、S b1 、S b2 Correspond to S on = (0 0 0 0), it can be seen that only one switch is on at the same time in the whole process; let u be within a preset carrier period T s Is of average value V s ，u dc Is of average value V dc ，L 1 Average value of I L Based on the above formula, u s >0、i L1 >The state space average equation of the H-bridge at 0 is
V s I L T＝V dc I L t off
Wherein V is s An ac grid voltage average value that is a single-phase ac power supply; i L Is the inductance L 1 Is set according to the current average value of (a); v (V) dc The voltage average value of the direct current bus capacitor is; t is a preset carrier period; t is t off Is the switch off time.
Further, define D Sa2 Is S a2 On duty ratio, D Sa2 ＝t sa2 /T，t sa2 For Sa2 on time, the DC bus voltage can be considered to be equal to the reference voltage V when the system is operating stably dc ＝V ref It is possible to obtain:
wherein D is sa2 Is S a2 An on duty cycle; v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref The reference voltage of the direct current bus is preset.
Based on the above, when u s ＜0、i L1 When < 0, S b2 The on duty ratio is
Wherein D is Sb2 Is S b2 An on duty cycle; v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref Is to preset DC bus parameterAnd (5) checking voltage.
Further, the amplitude of the carrier signal is defined as V tri Modulating a wave signal to v mod According to the PWM technical properties, a preset first charging function may be obtained:
wherein v is mod-sa2 A charging modulation signal for the sixth fully-controlled switching diode group; v mod-sb2 A charging modulation signal for the fourth fully-controlled switching diode group; v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref Presetting a direct current bus reference voltage; v (V) tri Presetting carrier signal amplitude; u (u) s Is an instantaneous value of the ac grid voltage; i.e L1 Is an ac side inductor current.
Further, when the storage battery pack is charged, the DC-DC converter operates as a step-down chopper circuit, S H Control L 3 Charge and discharge, S L The switching state of the DC-DC converter is always kept in the off state, and the second table is a switching state table of the DC-DC converter:
switch state meter of meter two DC-DC converter (GtB)
Further, S H Conduction, S L Shut off, u dc Through S H Is L 3 Charging, i b Raised. From kirchhoff's voltage law, we can get:
wherein u is dc Capacitor electricity for DC busPressing; l is inductance L 1 Is a value of inductance of (a); i.e b A battery current; u (u) b Is a storage battery.
Further, S H Turn off, S L Shut off, i b Through S L The freewheeling diode of (1) forms a loop through the storage battery, L 3 Discharge, i b And (3) lowering. From kirchhoff's voltage law, we can get:
wherein L is inductance L 1 Is a value of inductance of (a); i.e b A battery current; u (u) b Is a storage battery.
Further, u is within a preset carrier period T b Is of average value V b ，u dc Is of average value V dc ，i b Average value of I b Based on the above, u can be obtained s >0、i L1 >The state space average equation for the DC-DC converter at 0 is:
V b I b T＝V dc I b t SH
wherein V is b The average voltage value of the storage battery pack; i b An average current value of the battery pack; v (V) dc The average voltage value of the DC bus capacitor; t is t SH Is S H On time.
Further, define D SH Is S H On duty ratio, D SH ＝t SH /T，t SH Is S H On time, u when the system is running steadily dc ＝V ref (dc bus reference voltage), one can obtain:
wherein D is SH Is S H An on duty cycle; u (u) b Is the battery voltage; v (V) ref For presetting DC bus referenceA voltage.
Based on the above basis, a preset second charging function can be obtained, specifically:
wherein,is a first fully-controlled switch diode group S H Is provided; u (u) b A battery voltage instantaneous value; v (V) ref Presetting a direct current bus reference voltage; v (V) tri For presetting the carrier signal amplitude.
Further, in a discharging state, the storage battery transmits electric energy to an alternating current power grid, the H-bridge is in an active inversion state, the DC/DC converter is operated in a boosting chopper mode, and the power factor lambda at the power grid side is adjustable according to actual requirements. The storage battery is discharged in a constant current manner, and the CBC circuit inputs the storage battery as required so as to meet the power requirement of an alternating current power grid; for the analysis of the H-bridge switching state, in the discharge state, the accumulator transfers electrical energy into the network, network voltage u s And current i L1 The opposite direction. When u is s >0、i L1 < 0, first, S a1 Conduction, S a2 、S b1 、S b2 The switch is turned off, and the iL1 is connected with the diode in parallel through the Sa1 switch and the Sb 1. From kirchhoff's voltage law:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a function of the inductance value of the capacitor.
Further, due to L 1 The voltage is u s Thus i L1 Increase, L 1 In a charged state, then S a1 、S b2 Conducting S a2 、S b1 Shut off, i L1 Through S a1 、S b2 This isThe time-voltage relationship is:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a value of inductance of (a); u (u) dc Is the voltage of the DC bus capacitor.
Based on the above, L 1 The voltage is u s -u dc ，L 1 In a discharge state when u s <0、i L1 >0，S a2 Open, S a1 、S b1 、S b2 Shut off, can be obtained:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a function of the inductance value of the capacitor.
Further, due to u s ＜0，L 1 The voltage is u s ，i L1 Lowering, L 1 In a discharge state; subsequently, S a2 、S b1 Conduction, S a1 、S b2 All turn-off, at this time kirchhoff voltage relationship is:
wherein u is s Is an instantaneous value of the ac grid voltage; i.e L1 Is the inductance current of the alternating current side; l is inductance L 1 Is a value of inductance of (a); u (u) dc Is the voltage of the DC bus capacitor.
Based on the above, L 1 The voltage is u s +u dc Let i L1 Increase, L 1 In the charged state, the switching state table (λ= -1) of the H-bridge converter in the discharged state is shown in table three. According to Table IV, in us>0. if iL1 < 0, sa1, sa2, sb1, sb2 correspond to son= (1 0 0 0) during L1 charging, and Sa1, sa2, sb1, sb2 correspond to son= (1 0 0 1) during L1 discharging; at us < 0, iL1>At 0, sa1, sa2, sb1, sb2 correspond to son= (0 1 0 0) at L1 charge, and Sa1, sa2, sb1, sb2 correspond to son= (0 1 1 0) at L1 discharge.
Three H-bridge switch state table (lambda= -1) (BtG)
Further, according to the average state analysis of the charging mode, an operation formula of the modulation signal in the discharging mode can be obtained, namely, a first discharging function is preset, specifically:
/>
Wherein S is a1 A fifth fully-controlled switch diode group; s is S a2 A sixth fully-controlled switch diode group; v mod-sb2 Is a fourth fully-controlled switch diode group S b2 Is a discharge modulation signal of (a); v mod-sb1 Is a third fully-controlled switch diode group S b1 Is a discharge modulation signal of (a); v (V) s An ac grid voltage average value that is a single-phase ac power supply; v (V) ref Presetting a direct current bus reference voltage; v (V) tri Presetting carrier signal amplitude; u (u) s Is an instantaneous value of the ac grid voltage; i.e L1 Is an ac side inductor current.
Further, in the discharging mode, for the analysis of the switching state of the DC-DC converter, the DC-DC converter is operated in a boosting mode, SH is turned off, the voltages of the storage batteries are raised by the SL and SH antiparallel diodes, and table four is a table of the switching state of the DC-DC converter in the discharging mode.
Switch state table of four DC-DC converter (BtG)
Further, according to the state averaging principle, there is a steady state:
wherein D is SL Is S L : an on duty cycle; u (u) b Is the battery voltage; v (V) ref The reference voltage of the direct current bus is preset.
Further, neglecting circuit power loss, system power balance can be obtained:
wherein D is SL Is S L : an on duty cycle; v (V) ref Presetting a direct current bus reference voltage; p (P) ref Reference power for a direct current bus; i bref And presetting a reference current of the storage battery.
Based on the above basis, a preset second discharge function can be obtained, specifically:
wherein v is mod3 Modulating the signal for a second discharge; p (P) ref Discharging reference power for the direct current bus; i bref Presetting a reference current of a storage battery; v (V) ref Presetting a direct current bus reference voltage; v (V) tri For presetting the carrier signal amplitude.
As a further refinement, the first charge control model includes a first voltage outer loop controller, a first current inner loop controller, a first trigger selector, a first comparator, and a first single-phase grid voltage phase-locked loop; the data processing process of the first charge control model specifically comprises the following steps:
inputting an alternating current power grid voltage instantaneous value into a first single-phase power grid voltage phase-locked loop, and outputting a first current unit amplitude value and a second current unit amplitude value; subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a first direct current bus voltage difference value, inputting the first direct current bus voltage difference value to a first voltage outer ring controller, and outputting direct current bus charging reference power; dividing the direct current bus charging reference power and the effective value of the alternating current power grid voltage of the single-phase alternating current power supply, determining the effective value of the first active component, performing product operation with the second current unit amplitude, and outputting the first active current component; dividing an alternating current power grid voltage effective value of a single-phase alternating current power supply and preset power grid reactive power to determine a first active component effective value, multiplying the first active component effective value by a first current unit amplitude value, and outputting a first active current component; adopting a first active current component and a first active current component to perform addition operation, determining a first direct current bus operation current, performing subtraction operation with an alternating current side inductance current, and outputting a first error current; inputting a first charging modulation signal and an alternating current grid voltage instantaneous value into a first trigger selector, and outputting a first target charging modulation signal; inputting a first error current to a first current inner loop controller, outputting a first voltage signal, and performing addition operation with a first target charging modulation signal to determine a first target signal; the first target signal and the preset triangular wave signal are input to a first comparator, and a first PWM charging control signal is generated.
As a further refinement, the second charge control model includes a second voltage outer loop controller, a second current inner loop controller, a second trigger selector, and a second comparator; the data processing process of the second charge control model specifically comprises the following steps:
subtracting a preset storage battery reference voltage from a storage battery voltage instantaneous value, outputting a storage battery voltage difference value, inputting the storage battery voltage difference value to a second voltage outer ring controller, and determining storage battery reference power; inputting a preset storage battery reference current, a storage battery voltage difference value and a storage battery reference power into a second trigger selector, outputting target electrical data, performing subtraction operation with the storage battery current, and outputting an electrical parameter difference value; inputting the electrical parameter difference value into a second current inner loop controller, outputting a second voltage signal, and carrying out addition operation with a second charging modulation signal to determine a second target signal; and inputting the second target signal and the preset triangular wave signal to a second comparator to generate a second PWM charging control signal.
As a further improvement, the first discharge control model includes a third voltage outer loop controller, a third current inner loop controller, and a third comparator; the data processing process of the first discharge control model specifically comprises the following steps:
Subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a second direct current bus voltage difference value, inputting the second direct current bus voltage difference value to a third voltage outer ring controller, and outputting direct current bus discharge reference power; substituting the direct current bus discharge reference power into a preset second discharge function, and calculating a second discharge modulation signal; dividing the direct current bus discharging reference power and the preset storage battery reference voltage, determining storage battery operation current, subtracting the storage battery operation current from the storage battery current, and outputting a storage battery current difference value; inputting the current difference value of the storage battery pack to a third current inner loop controller, outputting a third voltage signal, and carrying out addition operation with the second discharge modulation signal to determine a third target signal; and inputting the third target signal and the preset triangular wave signal to a third comparator to generate a first PWM discharge control signal.
As a further improvement, the second discharge control model includes a second single-phase grid voltage phase-locked loop, a fourth current inner loop controller, a fourth trigger selector, and a fourth comparator; the data processing process of the second discharge control model specifically comprises the following steps:
inputting the instantaneous value of the alternating current power grid voltage into a second single-phase power grid voltage phase-locked loop, and outputting a third current unit amplitude value and a fourth current unit amplitude value; dividing an alternating current power grid voltage effective value of a single-phase alternating current power supply and preset power grid reactive power to determine a second reactive component effective value, multiplying the second reactive component effective value by a third current unit amplitude value, and outputting a second reactive current component; dividing the reference power of the DC bus discharge and the effective value of the AC grid voltage of the single-phase AC power supply, determining the effective value of the second active component, multiplying the effective value of the second active component by the fourth current unit amplitude, and outputting the second active current component; adopting a second active current component and a second reactive current component to carry out addition operation, determining a second direct current bus operation current, carrying out subtraction operation with an alternating current side inductance current, and outputting a second error current; inputting the first discharge modulation signal and the alternating current grid voltage instantaneous value to a fourth trigger selector, and outputting a first target discharge modulation signal; inputting the second error current to a fourth current inner loop controller, outputting a fourth voltage signal, and performing addition operation with the first target discharge modulation signal to determine a fourth target signal; and inputting the fourth target signal and the preset triangular wave signal to a fourth comparator to generate a second PWM discharge control signal.
As a further improvement, the microprocessor module is also used for:
when the direct current bus judges that the voltage meets the preset charging condition, comparing the voltage instantaneous value of the storage battery in the electrical data of the storage battery with a preset voltage value of the storage battery;
if the voltage instantaneous value of the storage battery is smaller than the preset voltage value of the storage battery, charging the storage battery in the storage battery capacity balancing circuit by adopting the storage battery current in the storage battery electrical data;
if the voltage instantaneous value of the storage battery is equal to a preset voltage value of the storage battery, based on a coulomb integration method, respectively carrying out capacity calibration on each storage battery by adopting the charge state of each storage battery in the storage battery and the current of the storage battery, and controlling a first full-control switch, a second full-control switch and a third full-control switch in a capacity balancing circuit of the storage battery to be turned on or turned off;
when the direct current bus judges that the voltage meets the preset discharging condition, the direct current bus discharging reference power is input to a preset updating function to carry out iterative operation, and the number of initial basic batteries is determined;
when the number of the initial basic group batteries is equal to the total number of the storage batteries corresponding to the storage battery capacity balancing circuit, the current number of the initial basic group batteries is used as the number of the target basic group batteries, and the first full-control switch and the second full-control switch are controlled to be turned on.
In the state of charge, the switch state of the storage battery CBC capacity calibration circuit is analyzed, when the electric quantity of the storage battery is insufficient, the storage battery is charged with a large current and a constant current, which are given in a manufacturer data manual, the voltage of the storage battery is increased, when the voltage reaches a given voltage value (Ubref) in the manual, the storage battery is converted into a constant voltage and a small current for charging, and when the charging is ended, the capacity of part of the storage battery cannot reach 100% due to the difference among the storage batteries. Table III is a CBC switch state table. Battery charging is therefore divided into two processes: if u b <U bref And (3) carrying out heavy-current constant-current charging, conducting S1+ and Sn, (S2+,. The first and second full-control type switches S1 to n-1) and (S1+,. The first and second full-control type switches Sn-1) are all turned off, namely charging the storage battery pack in the storage battery pack capacity balancing circuit by adopting storage battery pack current in storage battery pack electrical data, and controlling the first full-control type switch S1+ and the n second full-control type switch Sn to be turned on, and controlling the 1 st second full-control type switch S1 to the n-1 full-control type switch Sn-1 and the third full-control type switch (S2+), the first and second full-control type switches Sn+) to be turned off.
Three CBC switch state table (GtB)
Further, referring to FIG. 7, if u b ＝U bref Performing constant-voltage low-current charging, and performing capacity calibration on the batteries with partial capacity deficiency to enable the capacities to reach 100%, namely performing capacity calibration on the batteries by adopting the charge states of the batteries in the battery and the battery currents based on a coulomb integration method if the instantaneous value of the battery voltage is smaller than a preset voltage value of the battery, and controlling a first full-control switch, a second full-control switch and a third full-control switch in a battery capacity balancing circuit 6 to be turned on or turned off; for example, using N batteries as an example and N being an even number, the coulombic integration method is employed to determine the current state of each battery among the N batteries The state of charge of the storage battery is sequentially detected and updated, a fully-controlled switch corresponding to the serial number of the storage battery is controlled by a microprocessor module to be turned off, after all storage batteries are subjected to SOC detection and update processing (i.e. i=N), the initial updated state of charge of the storage battery can be obtained, in the process of SOC detection and update of the storage battery, all storage batteries with insufficient capacity are selected based on the initial updated state of charge of the storage battery, and the storage batteries are processed by an array a [ j ]]J is the number of batteries with insufficient capacity, and the maximum value is jmax=m. Next, at a [ j ]]Selected from a 2,4,6]The first group is configured, calibration charging is carried out, and a full-control switch corresponding to the serial number of the storage battery is controlled to be turned on or off, when a [2,4,6.. Multidot.M]When all the storage batteries have 100% capacity, a 1,3,5]And (3) performing calibration charging, and performing reciprocating circulation until the electric quantity of all the storage batteries reaches 100%, wherein if the electric quantity of all the storage batteries reaches 100%, the third full-control switch, the first full-control switch and the second full-control switch in the storage battery capacity balancing circuit 6 are all turned off after being controlled by the microprocessor module. The coulomb integration method specifically comprises the following steps:
Wherein,updating the battery state of charge for the initial of the ith battery; />The current battery state of charge for the ith battery; />Is the rated capacity of the storage battery; i.e b Is the battery current.
Further, in the discharging state, according to the power requirement of the power grid, the CBC selects the least number of storage batteries from small to large according to the sequence numberThe base group is placed, and when the voltage of the adjacent storage batteries is larger than the average voltage of the base group, the CBC puts the adjacent storage batteries into operation, and the like until all the storage batteries are added into the base group. Table six is a CBC switch state table in discharge mode, U in the table bx And the voltage of the storage battery pack is obtained after the x storage batteries are connected in series.
Six CBC switch state table (BtG)
Further, referring to fig. 8, since the end voltage of the battery is reduced due to the increase of the discharge depth, as the discharge proceeds, the number of the batteries of the basic group is gradually increased until all the batteries are added, for example, based on a preset update function, the current number x of the batteries of the basic group is calculated to be 10 by using the reference power of the dc bus discharge, 10 batteries are selected to form the basic battery group according to the serial number order of the batteries, and S is caused to 1+ And S is 10_ Opening, obtaining single-section voltage of adjacent storage batteries, namely single-section storage battery voltage with the serial number of 11, comparing the single-section voltage with the average voltage of the basic storage battery pack, adding storage batteries with the serial number of 11 on the basis of 10 storage batteries forming the basic storage battery pack if the single-section storage battery voltage is larger than the average voltage of the basic storage battery pack, namely enabling x+1 to obtain a new basic storage battery pack formed by 11 storage batteries, and controlling S if the quantity x of the basic storage battery pack is unequal to the total quantity N of the storage batteries 1+ And S is 11_ Starting, and continuing iterative operation based on a preset updating function until all the storage batteries are added into a basic storage battery pack, namely the quantity x of the storage batteries of the basic storage battery pack is equal to the total quantity N of the storage batteries, and starting after all the storage batteries are added into the basic storage battery pack and the serial numbers S10_,. In fig. 8, U is the rated voltage of the single battery.
The preset updating function is specifically:
wherein x is the number of storage batteries of the basic group; p (P) ref For DC bus reference power P in charged state ref ；I bref Presetting a reference current of a storage battery; u is the rated voltage of the single storage battery; u (u) x+1 Is the single-section voltage of the adjacent storage battery; u (u) p Is the average voltage of the base battery.
In the present embodiment, the state of charge V of each battery x The average voltage of the base battery pack, the voltages of the adjacent battery cells, and the states of charge of the respective batteries may be obtained by other existing detection means, and are not particularly limited herein.
In the embodiment of the invention, the invention provides a storage battery pack balanced charge-discharge control device, which comprises a microprocessor module, a single-phase alternating current power grid, an alternating current-direct current full-control bridge converter and a storage battery pack circuit module, wherein the microprocessor module is used for controlling the charge-discharge of the storage battery pack; the two ends of the AC/DC full-control bridge converter are respectively connected with a single-phase AC power grid and the storage battery pack circuit module; the single-phase alternating current power grid is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module; the AC-DC full-control bridge converter is used for generating an AC side inductance current and transmitting the inductance current to the microprocessor module; the storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module; the microprocessor module is used for calculating a direct current bus judgment voltage by adopting an alternating current power grid voltage instantaneous value and an alternating current side inductance current, generating a PWM charging control signal according to a preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and storage battery electrical data when the direct current bus judgment voltage meets preset charging conditions, and generating a PWM discharging control signal according to the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets preset discharging conditions; the PWM charging control signal and the PWM discharging control signal are used for controlling a full-control switch diode module in the AC/DC full-control bridge converter and a full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off; according to the scheme, the alternating current power grid voltage instantaneous value and the alternating current side inductance current are adopted, the direct current bus judgment voltage is calculated, when the direct current bus judgment voltage meets the preset charging condition or the preset discharging condition, the corresponding PWM charging control signal or PWM discharging control signal is generated based on the preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data or the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data, and then the fully-controlled switch diode module and the fully-controlled switch diode group are controlled to be turned on or turned off according to the PWM charging control signal or the PWM discharging control signal, and shunt is not needed when a resistor is connected to each battery in parallel for charging, so that stable storage battery voltage and charging current are obtained, and the service life of the storage battery is further prolonged; meanwhile, active and reactive control can be carried out on the power grid side in the charging and discharging process of the storage battery; having inter-cell charge balancing capability during battery charging; the charge and discharge current is controllable, the ripple content is low, and the service life of the battery is prolonged; the storage battery capacity balancing circuit can actively calibrate the storage battery with insufficient capacity autonomously; the power balance control strategy is completely integrated into the control algorithm of the charger; the control process of the main circuit topological structure and the power bidirectional flow is given; the action process of the switching device is given according to the direction of the voltage and the current of the power grid.
Referring to fig. 9, fig. 9 is a flowchart illustrating a method for controlling balanced charge and discharge of a battery pack according to a second embodiment of the present invention.
Step 901, when electrical data of a storage battery, an alternating current grid voltage instantaneous value and an alternating current side inductance current are received, calculating a direct current bus judgment voltage by adopting the alternating current grid voltage instantaneous value and the alternating current side inductance current.
In this embodiment, when the battery pack electrical data, the ac grid voltage instantaneous value, and the ac side inductor current are received, the dc bus judgment voltage is calculated using the ac grid voltage instantaneous value and the ac side inductor current.
And 902, when the direct current bus judges that the voltage meets the preset charging condition, generating a PWM charging control signal according to a preset charging control model, an alternating current grid voltage instantaneous value, an alternating current side inductance current and electric data of the storage battery.
In this embodiment, when the dc bus determines that the voltage meets the preset charging condition, a PWM charging control signal is generated according to the preset charging control model, the ac grid voltage instantaneous value, the ac side inductor current, and the battery pack electrical data.
Step 903, when the direct current bus judges that the voltage meets the preset discharging condition, generating a PWM discharging control signal according to a preset discharging control model, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and electric data of a storage battery pack; the PWM charging control signal and the PWM discharging control signal are used for controlling the full-control switch diode module in the AC/DC full-control bridge converter and the full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
In the embodiment, when the direct current bus judges that the voltage meets the preset discharge condition, a PWM discharge control signal is generated according to a preset discharge control model, an alternating current grid voltage instantaneous value, an alternating current side inductance current and storage battery pack electrical data; the PWM charging control signal and the PWM discharging control signal are used for controlling the full-control switch diode module in the AC/DC full-control bridge converter and the full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
In the embodiment of the invention, the invention provides a storage battery balanced charge-discharge control method, which is used for calculating a direct current bus judgment voltage by adopting an alternating current power grid voltage instantaneous value and an alternating current side induction current when receiving storage battery electric data, an alternating current power grid voltage instantaneous value and an alternating current side induction current; when the direct current bus judges that the voltage meets the preset charging condition, generating a PWM charging control signal according to a preset charging control model, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and electric data of the storage battery; when the direct current bus judges that the voltage meets the preset discharging condition, generating PWM discharging control signals according to a preset discharging control model, an alternating current power grid voltage instantaneous value, an alternating current side inductance current and electric data of a storage battery pack, wherein the PWM charging control signals and the PWM discharging control signals are used for controlling a full-control switch diode module in an alternating current-direct current full-control bridge converter and a full-control switch diode group in a direct current power double-quadrant converter to be turned on or turned off; according to the scheme, the alternating current power grid voltage instantaneous value and the alternating current side inductance current are adopted, the direct current bus judgment voltage is calculated, when the direct current bus judgment voltage meets the preset charging condition or the preset discharging condition, the corresponding PWM charging control signal or PWM discharging control signal is generated based on the preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data or the preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data, and then the full-control switch diode module and the full-control switch diode group are controlled to be turned on or off according to the PWM charging control signal or the PWM discharging control signal.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (14)
1. The device is characterized by comprising a microprocessor module, a single-phase alternating-current power grid, an alternating-current and direct-current full-control bridge converter and a storage battery circuit module;
two ends of the AC/DC full-control bridge converter are respectively connected with the single-phase AC power grid and the storage battery pack circuit module;
the single-phase alternating current power grid, the alternating current-direct current full-control bridge converter and the storage battery pack circuit module are all connected with the microprocessor module;
the single-phase alternating current power grid is used for generating an alternating current power grid voltage instantaneous value and transmitting the alternating current power grid voltage instantaneous value to the microprocessor module;
the AC/DC full-control bridge converter is used for generating an AC side inductance current and transmitting the AC side inductance current to the microprocessor module;
the storage battery circuit module is used for generating storage battery electrical data and transmitting the storage battery electrical data to the microprocessor module;
the microprocessor module is used for calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side inductance current, generating a PWM charging control signal according to a preset charging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets a preset charging condition, and generating a PWM discharging control signal according to a preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery electrical data when the direct current bus judgment voltage meets a preset discharging condition;
The PWM charging control signal and the PWM discharging control signal are used for controlling the full-control switch diode module in the AC/DC full-control bridge converter and the full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
2. The battery pack equalization charge-discharge control device of claim 1, wherein said battery pack electrical data comprises a battery pack voltage instantaneous value, a dc bus capacitor voltage, and a battery pack current; the storage battery pack circuit module comprises a direct current bus filter, a direct current power double-quadrant converter and a storage battery pack capacity balancing circuit;
two ends of the direct current power double-image limit converter are respectively connected with the direct current bus filter and the storage battery capacity balancing circuit;
the direct current bus filter is connected with the alternating current-direct current full-control bridge converter;
the direct current bus filter, the direct current power double-quadrant converter and the storage battery capacity balancing circuit are all connected with the microprocessor module;
the direct current bus filter is used for generating direct current bus capacitor voltage and transmitting the direct current bus capacitor voltage to the microprocessor module;
The direct-current power double-limit converter is used for generating storage battery current and transmitting the storage battery current to the microprocessor module;
the storage battery capacity equalization circuit is used for generating a storage battery voltage instantaneous value and transmitting the storage battery voltage instantaneous value to the microprocessor module.
3. The battery pack equalization charge-discharge control device of claim 1, wherein said single-phase ac power grid comprises a first hall voltage sensor, a first capacitor, and a single-phase ac power source;
the first capacitor is respectively connected with the single-phase alternating current power supply and the first Hall voltage sensor in parallel;
the first capacitor is connected with the AC/DC full-control bridge converter, and the first Hall voltage sensor is connected with the microprocessor module;
the first Hall voltage sensor is used for acquiring an alternating current grid voltage instantaneous value of the single-phase alternating current power supply and transmitting the alternating current grid voltage instantaneous value to the microprocessor module.
4. The battery pack equalization charge-discharge control device of claim 3, wherein said ac-dc full-control bridge inverter further comprises a first resistor, a first hall current sensor, and a first inductor;
the first end of the first resistor is connected with the first end of the first capacitor, and the second end of the first resistor is connected with the first end of the first Hall current sensor;
The second end of the first Hall current sensor is connected with the first end of the first inductor, and the second end of the first inductor and the second end of the first capacitor are both connected with the full-control switch diode module;
the full-control switch diode module is connected with the direct current bus filter in parallel;
the full-control switch diode module and the first Hall current sensor are connected with the microprocessor module;
the first Hall current sensor is used for acquiring the alternating-current side inductance current of the first inductor and transmitting the alternating-current side inductance current to the microprocessor module;
the full-control switch diode module is used for responding to the PWM charging control signal or the PWM discharging control signal sent by the microprocessor module to turn on or turn off.
5. The battery pack equalization charge-discharge control device of claim 2, wherein the dc bus filter comprises a second inductance, a second resistance, a second capacitance, a dc bus capacitance, and a second hall voltage sensor;
the first end of the second inductor is connected with the first end of the direct current bus capacitor, and the second end of the second inductor is connected with the first end of the second resistor;
The second end of the second resistor is connected with the first end of the second capacitor, and the second end of the second capacitor is connected with the second end of the direct current bus capacitor;
the direct current bus capacitor is respectively connected with the alternating current-direct current full-control bridge converter and the direct current power double-image limit converter in parallel;
the second Hall voltage sensor is connected with the microprocessor module;
the second Hall voltage sensor is used for acquiring the voltage of the direct-current bus capacitor and transmitting the voltage to the microprocessor module.
6. The battery pack equalization charge-discharge control device of claim 5, wherein said set of fully-controlled switching diodes comprises a first set of fully-controlled switching diodes and a second set of fully-controlled switching diodes; the direct-current power double-quadrant converter further comprises a third resistor, a third inductor and a second Hall current sensor;
the first end of the first full-control type switch diode group is connected with the first end of the direct current bus capacitor, and the second end of the first full-control type switch diode group is respectively connected with the first end of the third resistor and the first end of the second full-control type switch diode group;
The second end of the second full-control switch diode group is respectively connected with the second end of the direct current bus capacitor and the storage battery capacity balancing circuit, and the second end of the third resistor is connected with the first end of the third inductor;
the second end of the third inductor is connected with the first end of the second Hall current sensor, and the second end of the second Hall current sensor is connected with the storage battery capacity balancing circuit;
the first full-control type switch diode group, the second full-control type switch diode group and the second Hall current sensor are all connected with the microprocessor module;
the second Hall current sensor is used for acquiring the battery pack current of the battery pack capacity balancing circuit and transmitting the battery pack current to the microprocessor module;
the first full-control switch diode group is used for responding to the PWM charging control signal sent by the microprocessor module to turn on or turn off;
the second full-control switch diode group is used for responding to the PWM discharge control signal sent by the microprocessor module to be turned on or turned off.
7. The battery pack equalization charge-discharge control device of claim 6, wherein said battery pack capacity equalization circuit comprises a plurality of sets of battery switch circuits and a third hall voltage sensor, each set of said battery switch circuits comprising a third fully-controlled switch and a cascaded battery, a first fully-controlled switch, a second fully-controlled switch;
The first full-control switch, the second full-control switch and the third Hall voltage sensor are all connected with the microprocessor module;
the first full-control switch is connected with the second Hall current sensor in series;
the third full-control switch is connected in parallel between the storage battery and the first full-control switch;
the total number of the storage battery switch circuits is the same as the total number N of storage batteries corresponding to the storage battery capacity balancing circuits, the storage batteries are sequentially connected in series to form a storage battery pack, and the third Hall voltage sensor is connected in parallel with the storage battery pack;
the number N of the storage batteries of each group of storage battery switch circuits is sequentially increased and is equal to the group number of the storage battery switch circuits, N is more than or equal to 1 and less than or equal to N, and N is an integer;
the third Hall voltage sensor is used for acquiring the voltage instantaneous value of the storage battery pack and transmitting the voltage instantaneous value to the microprocessor module.
8. The battery pack equalization charge-discharge control device of claim 3, wherein said preset charge control model comprises a first charge control model and a second charge control model; the preset discharge control model comprises a first discharge control model and a second discharge control model; the PWM charging control signals comprise a first PWM charging control signal and a second PWM charging control signal; the PWM discharge control signals comprise a first PWM discharge control signal and a second PWM discharge control signal; the microprocessor module is specifically configured to:
Calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side inductance current;
when the direct current bus judges that the voltage meets a preset charging condition, substituting the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the alternating current power grid voltage average value of the single-phase alternating current power supply into a preset first charging function, and calculating a first charging modulation signal;
substituting the instantaneous value of the voltage of the storage battery into a preset second charging function, and calculating a second charging modulation signal;
inputting the first charging modulation signal, the direct-current bus capacitor voltage, the alternating-current side inductance current and the alternating-current power grid voltage instantaneous value into a first charging control model to generate a first PWM charging control signal;
inputting the second charging modulation signal, the battery voltage instantaneous value and the battery current into a second charging control model to generate a second PWM charging control signal;
when the direct current bus judging voltage meets a preset discharging condition, inputting the direct current bus capacitor voltage and the storage battery current into a first discharging control model to generate a first PWM discharging control signal and direct current bus discharging reference power;
Substituting the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the alternating current power grid voltage average value of the single-phase alternating current power supply into a preset first discharging function, and calculating a first discharging modulation signal;
and inputting the first discharge modulation signal, the alternating current grid voltage instantaneous value, the direct current bus discharge reference power and the alternating current side inductance current into a second discharge control model to generate a second PWM discharge control signal.
9. The battery pack equalization charge-discharge control device of claim 8, wherein the first charge control model comprises a first voltage outer loop controller, a first current inner loop controller, a first trigger selector, a first comparator, and a first single-phase grid voltage phase-locked loop; the data processing process of the first charging control model specifically comprises the following steps:
inputting the alternating current power grid voltage instantaneous value into a first single-phase power grid voltage phase-locked loop, and outputting a first current unit amplitude value and a second current unit amplitude value;
subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a first direct current bus voltage difference value, inputting the first direct current bus voltage difference value to a first voltage outer ring controller, and outputting direct current bus charging reference power;
Dividing the direct current bus charging reference power and the alternating current grid voltage effective value of the single-phase alternating current power supply to determine a first active component effective value, performing product operation with the second current unit amplitude, and outputting a first active current component;
dividing the effective value of the alternating current power grid voltage of the single-phase alternating current power supply with the preset power grid reactive power to determine a first active component effective value, multiplying the first active component effective value with the first current unit amplitude to output a first active current component;
adopting the first active current component and the first active current component to perform addition operation, determining a first direct current bus operation current, performing subtraction operation with the alternating current side inductance current, and outputting a first error current;
inputting the first charging modulation signal and the alternating current grid voltage instantaneous value to a first trigger selector, and outputting a first target charging modulation signal;
inputting the first error current to a first current inner loop controller, outputting a first voltage signal, and performing addition operation with the first target charging modulation signal to determine a first target signal;
and inputting the first target signal and the preset triangular wave signal to a first comparator to generate a first PWM charging control signal.
10. The battery pack equalization charge-discharge control device of claim 8, wherein said second charge control model comprises a second voltage outer loop controller, a second current inner loop controller, a second trigger selector, and a second comparator; the data processing process of the second charge control model specifically comprises the following steps:
subtracting the preset reference voltage of the storage battery and the instantaneous value of the voltage of the storage battery, outputting a voltage difference value of the storage battery and inputting the voltage difference value of the storage battery to a second voltage outer ring controller, and determining the reference power of the storage battery;
inputting a preset storage battery reference current, the storage battery voltage difference value and the storage battery reference power into a second trigger selector, outputting target electrical data, performing subtraction operation with the storage battery current, and outputting an electrical parameter difference value;
inputting the electrical parameter difference value to a second current inner loop controller, outputting a second voltage signal, and performing addition operation with the second charging modulation signal to determine a second target signal;
and inputting the second target signal and the preset triangular wave signal to a second comparator to generate a second PWM charging control signal.
11. The battery pack equalization charge-discharge control device of claim 8, wherein said first discharge control model comprises a third voltage outer loop controller, a third current inner loop controller, and a third comparator; the data processing process of the first discharge control model specifically comprises the following steps:
Subtracting the preset direct current bus reference voltage and the direct current bus capacitor voltage, determining a second direct current bus voltage difference value, inputting the second direct current bus voltage difference value to a third voltage outer ring controller, and outputting direct current bus discharge reference power;
substituting the direct current bus discharge reference power into a preset second discharge function, and calculating a second discharge modulation signal;
dividing the direct current bus discharging reference power and a preset storage battery reference voltage to determine storage battery operation current, subtracting the storage battery operation current from the storage battery current, and outputting a storage battery current difference;
inputting the current difference value of the storage battery pack to a third current inner loop controller, outputting a third voltage signal, and carrying out addition operation with the second discharge modulation signal to determine a third target signal;
and inputting the third target signal and the preset triangular wave signal to a third comparator to generate a first PWM discharge control signal.
12. The battery pack equalization charge-discharge control device of claim 8, wherein the second discharge control model comprises a second single-phase grid voltage phase-locked loop, a fourth current inner loop controller, a fourth trigger selector, and a fourth comparator; the data processing process of the second discharge control model specifically comprises the following steps:
Inputting the alternating current power grid voltage instantaneous value into a second single-phase power grid voltage phase-locked loop, and outputting a third current unit amplitude value and a fourth current unit amplitude value;
dividing the effective value of the alternating current power grid voltage of the single-phase alternating current power supply with the preset power grid reactive power to determine a second reactive component effective value, multiplying the second reactive component effective value with the third current unit amplitude to output a second reactive current component;
dividing the reference power of the direct current bus and the effective value of the alternating current power grid voltage of the single-phase alternating current power supply, determining the effective value of a second active component, performing product operation with the fourth current unit amplitude, and outputting the second active current component;
adopting the second active current component and the second reactive current component to perform addition operation, determining a second direct current bus operation current, performing subtraction operation with the alternating current side inductance current, and outputting a second error current;
inputting the first discharge modulation signal and the alternating current grid voltage instantaneous value to a fourth trigger selector, and outputting a first target discharge modulation signal;
inputting the second error current to a fourth current inner loop controller, outputting a fourth voltage signal, and performing addition operation with the first target discharge modulation signal to determine a fourth target signal;
And inputting the fourth target signal and the preset triangular wave signal to a fourth comparator to generate a second PWM discharge control signal.
13. The battery pack equalization charge-discharge control device of claim 8, wherein said microprocessor module is further configured to:
when the direct current bus judges that the voltage meets a preset charging condition, comparing a storage battery voltage instantaneous value in the storage battery electrical data with a preset storage battery given voltage value;
if the voltage instantaneous value of the storage battery is smaller than the given voltage value of the preset storage battery, charging the storage battery in the storage battery capacity balancing circuit by adopting the storage battery current in the storage battery electrical data;
if the voltage instantaneous value of the storage battery pack is equal to the preset voltage value of the storage battery pack, respectively carrying out capacity calibration on each storage battery by adopting the charge state of each storage battery in the storage battery pack and the current of the storage battery pack based on a coulomb integration method, and controlling a first full-control switch, a second full-control switch and a third full-control switch in a capacity balancing circuit of the storage battery pack to be turned on or turned off;
when the direct current bus judges that the voltage meets the preset discharging condition, the direct current bus discharging reference power is input to a preset updating function to carry out iterative operation, and the number of initial basic batteries is determined;
When the number of the initial basic group batteries is equal to the total number of the storage batteries corresponding to the storage battery capacity balancing circuit, the current number of the initial basic group batteries is used as the number of the target basic group batteries, and the first full-control switch and the second full-control switch are controlled to be turned on.
14. The method for controlling the balanced charge and discharge of the storage battery pack is characterized by comprising the following steps of:
when electric data of a storage battery, an alternating current power grid voltage instantaneous value and an alternating current side induction current are received, calculating a direct current bus judgment voltage by adopting the alternating current power grid voltage instantaneous value and the alternating current side induction current;
when the direct current bus judges that the voltage meets a preset charging condition, generating a PWM charging control signal according to a preset charging control model, the alternating current grid voltage instantaneous value, the alternating current side inductance current and the storage battery pack electrical data;
when the direct current bus judges that the voltage meets a preset discharging condition, generating a PWM discharging control signal according to a preset discharging control model, the alternating current power grid voltage instantaneous value, the alternating current side inductance current and the storage battery pack electrical data; the PWM charging control signal and the PWM discharging control signal are used for controlling a full-control switch diode module in the AC/DC full-control bridge converter and a full-control switch diode group in the DC power double-quadrant converter to be turned on or turned off.
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