CN112953193B - Three-phase PFC soft start current impact inhibition method and device, charger and medium - Google Patents

Three-phase PFC soft start current impact inhibition method and device, charger and medium Download PDF

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Publication number
CN112953193B
CN112953193B CN202110272364.5A CN202110272364A CN112953193B CN 112953193 B CN112953193 B CN 112953193B CN 202110272364 A CN202110272364 A CN 202110272364A CN 112953193 B CN112953193 B CN 112953193B
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bus voltage
current bus
direct current
command value
phase pfc
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CN112953193A (en
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施向前
李生超
张宇探
唐志俊
纪晓泳
陈磊敏
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United Automotive Electronic Systems Co Ltd
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United Automotive Electronic Systems Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M1/00—Details of apparatus for conversion
    • H02M1/36—Means for starting or stopping converters
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
    • H02J7/02—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries for charging batteries from ac mains by converters
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Rectifiers (AREA)

Abstract

The invention provides a method and a device for inhibiting three-phase PFC soft start current surge, a charger and a medium. The three-phase PFC soft start current surge suppression method comprises the following steps: updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value; loop calculation is carried out according to the updated direct current bus voltage command value, and a modulated wave signal of the three-phase PFC is obtained; acquiring the duty ratio of the three-phase PFC according to the modulated wave signal; and generating PWM signals according to the duty ratio, and driving the power devices of the three-phase PFC to be turned off and turned on. According to the three-phase PFC soft start current surge suppression method, the device, the charger and the medium, provided by the invention, on the premise of not increasing any hardware cost, the current surge at the moment of PFC start can be effectively suppressed, the stable establishment of the voltage of the direct-current bus is ensured, and the stability and the reliability of the vehicle-mounted charger are obviously improved.

Description

Three-phase PFC soft start current impact inhibition method and device, charger and medium
Technical Field
The invention belongs to the technical field of circuit control, and particularly relates to a three-phase PFC soft start current surge suppression method, a device and a storage medium.
Background
With the development of new energy automobiles represented by plug-in type, especially the high-speed development of pure electric automobiles, a great deal of convenience is brought to the travel and life modes of people. In recent years, electric drive technology for automobiles has received increasing attention. The vehicle-mounted charger is used as one of core parts of the new energy automobile, and stable and reliable operation is an important index of the working performance of the vehicle-mounted charger.
Referring to fig. 1 and 2, fig. 1 is a schematic diagram of a typical vehicle-mounted charger system architecture; fig. 2 is a schematic diagram of the three-phase PFC of fig. 1. PFC (Power Factor Correction) in fig. 1 converts ac grid voltage into stable dc bus voltage while ensuring good input ac current sine and consistent grid voltage phase. LLC (Resonant Converter) is responsible for converting the dc bus voltage established by PFC into a suitable dc charging voltage for charging the high voltage battery pack.
As the interface of the power grid and the input of LLC, PFC faces severe working conditions such as power grid distortion, unbalance, harmonic waves and the like, current impact is easy to occur in the starting process, the PFC voltage building failure is caused by light weight, the vehicle-mounted charger cannot work normally, the hardware circuit is damaged by heavy weight, and the vehicle-mounted charger recalls and compensates.
A rush current suppression circuit is generally used in the prior art to suppress the rush current. One of them is a method of using a line in which a surge current suppressing impedance is connected in parallel with a relay on an AC side or a DC (direct current) line, but since this method uses a mechanical switch, there are drawbacks as follows:
1. the reliability is poor due to the problem of the switch lifetime.
2. The additional rush current is required to suppress the current, so that the cost is increased, and the difficulty of circuit design layout is increased.
3. Due to the reasons of maintenance, time delay and the like of the trigger circuit, the circuit is easy to be in a failure state and is difficult to truly realize the protection of the impact current under the states of power supply transient, repeated starting and the like.
Another way is to use controlled switches such as thyristors in a conventional PFC (power factor correction) line rectifier bridge, but special protection functions are difficult to achieve due to inflexibility of control by the use of semi-controlled devices. The use of non-isolated bi-directional operating circuits and a separate charging and inverting circuit architecture leads to increased cost and size.
Therefore, how to provide a method for suppressing the soft start current surge of the three-phase PFC to overcome the above-mentioned drawbacks in the prior art is becoming one of the technical problems to be solved by those skilled in the art.
It should be noted that the information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to overcome the defects in the prior art, and provides a three-phase PFC soft start current surge suppression method, a device, a charger and a medium, which aim to effectively suppress current surge at the moment of PFC start and ensure stable establishment of direct-current bus voltage on the premise of not increasing any hardware cost, thereby improving the stability and reliability of a vehicle-mounted charger.
In order to achieve the above purpose, the present invention is realized by the following technical scheme: a three-phase PFC soft start current surge suppression method comprises the following steps:
S1: updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value;
s2: performing loop calculation according to the updated direct current bus voltage command value to obtain a modulated wave signal of the three-phase PFC;
s3: acquiring the duty ratio of the three-phase PFC according to the modulated wave signal; and generating PWM signals according to the duty ratio, and driving the power devices of the three-phase PFC to be turned off and turned on.
Optionally, after receiving the start instruction, before executing step S1, the method further includes the following steps:
S01: judging whether the power grid voltage accords with a preset voltage stability index, if so, selecting an angle corresponding to a preset fixed position of the power grid voltage, and executing step S1 when the angle is detected; if not, executing step S02;
s02: the initial modulation degree is set and step S01 is performed.
Optionally, the method for judging whether the power grid voltage meets the preset voltage stability index includes:
acquiring a fundamental wave positive sequence reactive shaft component according to the power grid voltage;
calculating a power grid voltage angle according to the fundamental wave positive sequence reactive axis component;
If the power grid voltage frequency is maintained in a preset range through a plurality of preset periods or within a preset period duration, the power grid voltage accords with a preset voltage stability index; otherwise, the power grid voltage does not accord with a preset voltage stability index.
Optionally, in step S02, the method for acquiring the initial modulation degree includes obtaining by:
Wherein U m is an initial modulation degree, U rms is an effective value of grid phase voltage, and U dc is an actual value of direct current bus voltage.
Optionally, in step S01, the method for selecting an angle corresponding to a preset fixed position of the grid voltage includes:
and selecting an angle corresponding to the preset fixed position at any angle position in the power grid voltage angle range.
Optionally, in step S1, the method for updating the dc bus voltage command value according to the dc bus voltage target value and the dc bus voltage command value includes:
if the direct current bus voltage command value is more than or equal to the direct current bus voltage target value, updating the direct current bus voltage command value according to a first preset strategy; otherwise, updating the direct current bus voltage command value according to a second preset strategy.
Optionally, the method for updating the direct current bus voltage command value according to the first preset strategy includes: the dc bus voltage command value is updated by,
uref＝utgt
Wherein u ref is the updated direct current bus voltage command value; u tgt is the dc bus voltage target value.
Optionally, according to a second preset strategy, the method for updating the direct current bus voltage command value comprises the following steps: the dc bus voltage command value is updated by,
uref＝uref_old+Δu
Wherein u ref is an updated direct current bus voltage command value, u ref_old is the direct current bus voltage command value, deltau is a voltage increment, and the voltage increment is determined according to the direct current bus voltage target value, the direct current bus voltage actual value at the starting time and the three-phase PFC starting time.
Alternatively, the voltage increment is obtained by:
Δu＝(utgt－udc)/t
Wherein Δu is the voltage increment, u tgt is the target value of the dc bus voltage, u dc is the actual value of the dc bus voltage at the starting time, and t is the starting time of the three-phase PFC.
In order to achieve the above object, the present invention also provides a three-phase PFC soft start current surge suppression device, including,
The direct-current bus voltage soft start module is configured to update the direct-current bus voltage command value according to the direct-current bus voltage target value and the direct-current bus voltage command value;
The loop calculation module is configured to perform loop calculation according to the updated direct current bus voltage command value to acquire a modulated wave signal of the three-phase PFC;
The driving signal output module is configured to acquire the duty ratio of the three-phase PFC according to the modulated wave signal; and the PWM signal is generated according to the duty ratio, and the power device of the three-phase PFC is driven to be turned off and turned on.
Optionally, the system further comprises a power grid voltage extraction module and a phase locking module;
the power grid voltage extraction module is configured to acquire fundamental wave positive sequence reactive shaft components according to power grid voltage;
the phase-locking module is configured to calculate a power grid voltage angle according to the fundamental wave positive sequence reactive axis component;
the phase locking module is further used for setting an initial modulation degree to enable the difference value between the power grid voltage and the three-phase PFC modulation voltage to meet a preset difference value threshold value when the power grid voltage does not meet a preset voltage stability index; and then the soft start module is used for realizing soft start current surge suppression of the three-phase PFC.
In order to achieve the above purpose, the invention also provides a charger, which adopts the three-phase PFC soft start current surge suppression method described in any one of the above to control or comprises the three-phase PFC soft start current surge suppression device described in any one of the above.
In order to achieve the above object, the present invention further provides a computer-readable storage medium having stored thereon computer-executable instructions that, when executed, implement the steps of the three-phase PFC soft start current surge suppression method according to any one of the above.
Compared with the prior art, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium have the following beneficial effects:
The invention provides a three-phase PFC soft start current surge suppression method, which comprises the following steps: updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value; performing loop calculation according to the updated direct current bus voltage command value to obtain a modulated wave signal of the three-phase PFC; acquiring the duty ratio of the three-phase PFC according to the modulated wave signal; and generating PWM signals according to the duty ratio, and driving the power devices of the three-phase PFC to be turned off and turned on. So configured, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium provided by the invention have the advantages that the design of the three-phase PFC circuit is not required to be modified, and the hardware cost is reduced; and the method has good adaptability to ideal power grid working conditions, unbalanced power grid working conditions, distorted power grid working conditions and typical harmonic power grid working conditions, no obvious impact current exists in the starting process, and no obvious overshoot exists in the direct current bus voltage establishment process. Furthermore, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium are suitable for the high-power charger, can realize continuous start and stop, namely can realize stable start no matter the voltage value of the current direct-current bus. Furthermore, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium provided by the invention are not limited to the topological structure of the three-phase PFC hardware main circuit, and have wide application fields including the field of new energy automobiles and three-phase PFC products applied to other fields, such as a photovoltaic grid-connected inverter, an active power filter and the like. Therefore, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium provided by the invention can effectively suppress the current surge at the moment of PFC start on the premise of not increasing any hardware cost, ensure the stable establishment of the voltage of the direct-current bus, and obviously improve the stability and the reliability of the vehicle-mounted charger.
Drawings
FIG. 1 is a schematic diagram of a typical vehicle-mounted charger system architecture;
Fig. 2 is a schematic structural diagram of the three-phase PFC of fig. 1;
Fig. 3 is a general flow chart of a method for suppressing soft start current surge of a three-phase PFC according to an embodiment of the present invention;
Fig. 4 is a schematic flow chart of a method for suppressing soft start current surge of a three-phase PFC according to an embodiment of the present invention;
Fig. 5 is a schematic structural diagram of a three-phase PFC soft start current surge suppression device according to an embodiment of the present invention;
Fig. 6 is a schematic diagram of a control block diagram of a three-phase PFC soft start current surge suppression device and a three-phase PFC according to an embodiment of the present invention;
FIG. 7 is a block diagram of a control method of the phase lock module in FIG. 6;
FIG. 8 is a block diagram of a control method of the DC bus voltage soft start module in FIG. 6;
wherein reference numerals are as follows:
100-power grid, 210-filter, 220-power device and 300-DC bus;
510-a power grid voltage extraction module, 520-a phase locking module, 530-a direct current bus voltage soft start module, 540-a loop calculation module and 550-a driving signal output module.
Detailed Description
The invention aims at providing a three-phase PFC soft start current surge suppression method, a device, a charger and a medium, wherein the starting current surge suppression method is added into three-phase PFC converter software, so that the three-phase PFC is reasonably controlled during starting, current surge at the moment of starting the PFC is effectively suppressed, stable establishment of direct-current bus voltage is ensured, and the stability and reliability of the vehicle-mounted charger are remarkably improved.
In order to make the purposes, advantages and features of the invention more clear, the method, the device, the charger and the medium for suppressing the soft start current surge of the three-phase PFC provided by the invention are further described in detail below with reference to the accompanying drawings. It should be noted that the drawings are in a very simplified form and are all to a non-precise scale, merely for convenience and clarity in aiding in the description of embodiments of the invention. It should be understood that the drawings are not necessarily to scale, emphasis instead being placed upon illustrating the principles of the invention. Specific design features of the invention disclosed herein, including for example, specific dimensions, orientations, positions, and configurations, will be determined in part by the specific intended application and use environment. In the embodiments described below, the same reference numerals are used in common between the drawings to denote the same parts or parts having the same functions, and the repetitive description thereof may be omitted. In this specification, like reference numerals and letters are used to designate like items, and thus once an item is defined in one drawing, no further discussion thereof is necessary in subsequent drawings.
These terms so used may be substituted where appropriate. Similarly, if a method described herein comprises a series of steps, and the order of the steps presented herein is not necessarily the only order in which the steps may be performed, and some of the described steps may be omitted and/or some other steps not described herein may be added to the method.
The embodiment provides a three-phase PFC soft start current surge suppression method. For easy understanding and description, the general flow of the three-phase PFC soft start current surge suppression method according to the present embodiment is described below, and then a specific description of each step is developed. Referring to fig. 3, fig. 3 is a general flow chart of the three-phase PFC soft start current surge suppression method according to the present embodiment. As can be seen from fig. 3, the method for suppressing the soft start current surge of the three-phase PFC provided by the present invention includes the following steps:
s1: and updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value.
S2: and carrying out loop calculation according to the updated direct current bus voltage command value to obtain a modulated wave signal of the three-phase PFC.
S3: acquiring the duty ratio of the three-phase PFC according to the modulated wave signal; and generating PWM signals according to the duty ratio, and driving the power devices of the three-phase PFC to be turned off and turned on.
In particular, according to the actual working condition, in the process of starting the three-phase PFC, the steps S1 to S3 may need to be repeated several times, which is not limited in the present invention.
It can be appreciated that the application field of the three-phase PFC soft start current surge suppression method is not limited, and the application field includes the field of new energy automobiles, and also includes, but is not limited to, three-phase PFC products applied to other fields, such as a photovoltaic grid-connected inverter, an active power filter, and the like.
So configured, the three-phase PFC soft start current surge suppression method provided by the invention has the advantages that the circuit design of the three-phase PFC is not required to be modified, and the hardware cost is reduced; and the method has good adaptability to ideal power grid working conditions, unbalanced power grid working conditions, distorted power grid working conditions and typical harmonic power grid working conditions, no obvious impact current exists in the starting process, and no obvious overshoot exists in the direct current bus voltage establishment process. Furthermore, the three-phase PFC soft start current surge suppression method provided by the invention is suitable for a relatively high-power charger, and can realize continuous startup and shutdown, namely stable startup can be realized no matter what the current DC bus voltage value is.
Preferably, after receiving the start command, before executing step S1, the method further includes the following steps:
S01: judging whether the power grid voltage accords with a preset voltage stability index, if so, selecting an angle corresponding to a preset fixed position of the power grid voltage, and executing step S1 when the angle is detected; if not, executing step S02;
s02: the initial modulation degree is set and step S01 is performed.
Preferably, referring to fig. 4, fig. 4 is a schematic flow chart of a method for suppressing soft start current surge of a three-phase PFC according to a preferred embodiment. As can be seen from fig. 4, after receiving the start command, the method for determining whether the power grid voltage meets the preset voltage stability index includes: acquiring fundamental wave positive sequence reactive shaft components eq according to the power grid voltage; and calculating the power grid voltage angle theta according to the fundamental wave positive sequence reactive axis component eq. If the power grid voltage frequency is maintained in a preset range through a plurality of preset periods or within a preset period duration, the power grid voltage accords with a preset voltage stability index; otherwise, the power grid voltage does not accord with a preset voltage stability index. It is to be understood that the present invention is not limited to the specific content of the preset voltage stability indicator, and as described above, in one embodiment, the preset voltage stability indicator may be a power grid stability indicator according to a specified number of periods of power grid operation, or may be a power grid stability indicator according to a preset range of power grid voltage frequency maintained within a certain time range.
Preferably, in step S02, the method for obtaining the initial modulation degree includes obtaining by:
In the formula, U m is an initial modulation degree, U rms is an effective value of grid phase voltage, and U dc is an actual value of direct current bus voltage at starting time. It will be appreciated that this is merely a description of an exemplary preferred embodiment and that the manner in which the initial modulation degree is set may be different, but the basic principle is the same so as to minimize the difference between the grid voltage and the three-phase PFC modulation voltage.
Preferably, in step S01, the method for selecting an angle corresponding to a preset fixed position of the grid voltage includes: and selecting an angle theta 1 (corresponding to the detected theta 1 in fig. 4) corresponding to the preset fixed position at any angle position in the power grid voltage angle range. For example, the range of the power grid voltage angle theta is 0-2 pi, any value of 0-2 pi is selected as theta 1, for example, theta 1 is 0, the three-phase PFC is ensured to be put into operation at a power grid voltage fixed position when being started each time, and the robustness of the system is improved.
Preferably, in step S1, the method for obtaining the dc bus voltage command value according to the dc bus voltage target value and the dc bus voltage command value includes: if the direct current bus voltage command value is more than or equal to the direct current bus voltage target value, updating the direct current bus voltage command value according to a first preset strategy; otherwise, updating the direct current bus voltage command value according to a second preset strategy. Specifically, the dc bus voltage target value is a stable dc voltage value, such as 800V, that is desired to be established by the three-phase PFC. The actual value of the dc bus voltage at the start-up time is between the grid-independent rectified voltage (voltage before the start of the three-phase PFC) and the target value of the dc bus voltage, for example 500V.
Preferably, the method for updating the direct current bus voltage command value according to the first preset strategy includes: the dc bus voltage command value is updated by,
uref＝utgt
Wherein u ref is the updated direct current bus voltage command value; u tgt is the dc bus voltage target value. It should be understood that the foregoing description is merely a description of the preferred embodiment, and the present invention is not limited to a specific method for obtaining the dc bus voltage command value, for example, in still another embodiment, the dc bus voltage actual value u dc at the starting time may be decremented to the dc bus voltage target value u tgt at a certain decrementing rate; in other embodiments, the direct current bus voltage command value u ref is smoothly reduced to the direct current bus voltage target value u tgt within a set period of time, which is not described in detail herein.
Further, the method for updating the direct current bus voltage command value according to the second preset strategy comprises the following steps: the dc bus voltage command value is updated by,
uref＝uref_old+Δu
Wherein u ref is an updated direct current bus voltage command value, u ref_old is the direct current bus voltage command value, deltau is a voltage increment, and the voltage increment is determined according to the direct current bus voltage target value, the direct current bus voltage actual value at the starting time and the three-phase PFC starting time.
Preferably, the voltage increment is obtained by:
Δu＝(utgt－udc)/t
Wherein Δu is the voltage increment, u tgt is the target value of the dc bus voltage, u dc is the actual value of the dc bus voltage at the starting time, and t is the starting time of the three-phase PFC. For example, if the dc bus voltage target value u tgt is 800V, the dc bus voltage actual value u dc at the start time is 500V, and the three-phase PFC start time is 10s, then according to the above formula: the voltage increment Δu= (800-500)/10=30v.
The dc bus voltage command value changes to 500V, 530V, 560V, 590V, 620V, 650V, 680V, 710V, 740V, 770V, 800V, and then 800V.
After that, step S2 is performed: and carrying out loop calculation according to the direct current bus voltage command value to obtain a modulated wave signal of the three-phase PFC. And step S3, converting the modulated wave signals of the three-phase PFC into three-phase PFC duty ratios, generating PWM signals to drive the power device to be turned on and off, and completing the control strategy operation.
In conclusion, the three-phase PFC soft start current surge suppression method provided by the invention is suitable for a relatively high-power charger, has good adaptability to ideal power grid working conditions, unbalanced power grid working conditions, distorted power grid working conditions and typical harmonic power grid working conditions, has no obvious surge current in the starting process, and has no obvious overshoot in the direct-current bus voltage establishment process. Furthermore, the three-phase PFC soft start current surge suppression method provided by the invention can realize continuous start and stop, namely stable start can be realized no matter what the current direct current bus voltage value is, no obvious surge current exists in the starting process, and no obvious overshoot exists in the direct current bus voltage establishment process. The method effectively inhibits current impact at the moment of PFC starting, ensures stable establishment of the voltage of the direct-current bus, and remarkably improves stability and reliability of the vehicle-mounted charger. Furthermore, the three-phase PFC soft start current surge suppression method provided by the invention can ensure that the power grid voltage and the PFC alternating current side voltage are as close as possible at the starting moment of the three-phase PFC, and greatly reduces the risk of damage caused by the current surge of a hardware circuit.
Still another embodiment of the present invention further provides a three-phase PFC soft start current surge suppression device, referring to fig. 5, fig. 5 is a schematic structural diagram of the three-phase PFC soft start current surge suppression device according to the present embodiment, including a dc bus voltage soft start module 530, a loop calculation module 540, and a driving signal output module 550.
Specifically, the dc bus voltage soft start module 530 is configured to update the dc bus voltage command value according to the dc bus voltage target value and the dc bus voltage command value. The loop calculation module 530 is configured to perform loop calculation according to the updated dc bus voltage command value, and obtain a modulated wave signal of the three-phase PFC. The driving signal output module 550 is configured to obtain a duty ratio of the three-phase PFC according to the modulated wave signal; and the PWM signal is generated according to the duty ratio, and the power device of the three-phase PFC is driven to be turned off and turned on.
Preferably, in a preferred embodiment, the three-phase PFC soft start current surge suppression device further includes a grid voltage extraction module 510 and a phase lock module 520. Specifically, the grid voltage extraction module 510 is configured to obtain a fundamental positive sequence reactive axis component according to the grid voltage. The phase-locking module 520 is configured to calculate a grid voltage angle from the fundamental positive sequence reactive axis component; the phase lock module 520 is further configured to set an initial modulation degree so that a difference between the grid voltage and the three-phase PFC modulated voltage meets a preset difference threshold when the grid voltage does not meet a preset voltage stability index, and preferably, the preset difference threshold is 0, that is: the difference between the grid voltage and the three-phase PFC modulation voltage is minimal, thereby ensuring no current surge. And then the soft start module 530 is used to implement soft start current surge suppression of the three-phase PFC.
Particularly, the three-phase PFC soft start current surge suppression device provided by the invention does not limit the topological structure of the three-phase PFC hardware main circuit. Moreover, the application fields are wide, the application fields comprise the new energy automobile field and three-phase PFC products applied to other fields, such as a photovoltaic grid-connected inverter, an active power filter and the like.
For easy understanding and description, please refer to fig. 6, fig. 6 is a schematic diagram of a control block diagram of the three-phase soft start current surge suppression device and the three-phase PFC according to the present embodiment. Wherein the three-phase PFC includes a filter 210 and a power device 220. As can be seen from fig. 6, in the three-phase PFC soft start current surge suppression device according to the present invention, the power grid voltage extraction module 510 extracts a fundamental positive sequence reactive axis component eq from the power grid 100 for the three-phase power grid voltage. The phase-locking module 520 calculates the power grid voltage angle θ according to eq, then determines whether the power grid voltage angle θ is stable, and detects an angle θ 1 corresponding to a certain fixed position of the power grid voltage (after the power grid voltage is stable, selects an angle θ1 corresponding to the preset fixed position), and if the condition is not satisfied, sets an initial modulation degreeWherein U m is an initial modulation degree, U rms is an effective value of the grid phase voltage, and U dc is an actual value of the direct current bus voltage at the starting moment. Referring to fig. 7, fig. 7 is a block diagram of a control method of the phase lock module. When the grid voltage angle θ is stable and the angle θ 1 corresponding to a certain fixed position of the grid voltage is detected, the dc bus voltage soft start module 530 starts to work, and determines whether the dc bus voltage command value u ref exceeds the dc bus voltage target value u tgt. The dc bus voltage target u tgt is a stable dc voltage established for the desired PFC, such as 800V. The value is between the grid uncontrolled rectified voltage and u tgt, such as 600V, if u ref≥utgt, the updated dc bus voltage command value u ref＝utgt; otherwise, u ref increases the voltage increment Δu on the basis of the pre-update dc bus voltage command value u ref. The magnitude of Δu depends on the dc bus voltage target value u tgt, the dc bus voltage value u dc at the starting time and the three-phase PFC starting time t, referring to fig. 8, fig. 8 is a block diagram of a control method of the dc bus voltage soft start module. The loop calculation module 540 performs loop calculation according to the dc bus voltage command value u ref, to obtain a three-phase PFC modulated wave signal Um. The driving signal output module 550 is responsible for converting the three-phase PFC modulated wave signal Um into a three-phase PFC duty ratio, and generating a PWM signal to drive the power device 220 to turn on and off, so as to complete the present control strategy operation.
So configured, the three-phase PFC soft start current surge suppression device provided by the invention can be arranged in the three-phase PFC converter software in a software mode, so that the design of a three-phase PFC circuit is not required to be modified, and the hardware cost is reduced; and the method has good adaptability to ideal power grid working conditions, unbalanced power grid working conditions, distorted power grid working conditions and typical harmonic power grid working conditions, no obvious impact current exists in the starting process, and no obvious overshoot exists in the direct current bus voltage establishment process. Furthermore, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium are suitable for the high-power charger, can realize continuous start and stop, namely can realize stable start no matter the voltage value of the current direct-current bus.
Based on the same inventive concept, a further embodiment of the present invention further provides a charger, where the charger uses the three-phase PFC soft start current surge suppression method described in any one of the above to control or includes the three-phase PFC soft start current surge suppression device described in any one of the above.
The charger provided by the invention and the three-phase PFC soft start current surge suppression method provided by any one of the embodiments or the three-phase PFC soft start current surge suppression device provided by any one of the embodiments belong to the same inventive concept, so that the charger has at least the same beneficial effects, and no detailed description is given here.
The present invention also provides a readable storage medium having stored therein a computer program which, when executed by a processor, can implement the steps of the three-phase PFC soft start current surge suppression method described above. The foregoing and detailed description of specific steps are not repeated herein.
The readable storage medium provided by the invention and the three-phase PFC soft start current surge suppression method provided by any one of the embodiments belong to the same inventive concept, so that the readable storage medium has at least the same beneficial effects, and will not be described in detail herein.
The readable storage media of embodiments of the present invention may take the form of any combination of one or more computer-readable media. The readable medium may be a computer readable signal medium or a computer readable storage medium. The computer readable storage medium can be, for example, but not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the computer-readable storage medium would include the following: an electrical connection having one or more wires, a portable computer hard disk, a hard disk, random Access Memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disc read-only memory (CD-ROM), an optical storage device, a magnetic storage device, or any suitable combination of the foregoing. In the context of this document, a computer readable storage medium may be any tangible medium that can contain, or store a program for use by or in connection with an instruction execution system, apparatus, or device.
The computer readable signal medium may include a propagated data signal with computer readable program code embodied therein, either in baseband or as part of a carrier wave. Such a propagated data signal may take any of a variety of forms, including, but not limited to, electro-magnetic, optical, or any suitable combination of the foregoing. A computer readable signal medium may also be any computer readable medium that is not a computer readable storage medium and that can communicate, propagate, or transport a program for use by or in connection with an instruction execution system, apparatus, or device.
Computer program code for carrying out operations of the present invention may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, smalltalk, C ++ and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computer (for example, through the Internet using an Internet service provider).
In summary, the three-phase PFC soft start current surge suppression method, the device, the charger and the medium provided by the invention can effectively suppress the current surge at the moment of PFC start on the premise of not increasing any hardware cost, ensure the stable establishment of the voltage of the direct-current bus, and obviously improve the stability and the reliability of the vehicle-mounted charger.
It should be noted that the apparatus and methods disclosed in the embodiments herein may be implemented in other ways. The apparatus embodiments described above are merely illustrative, for example, flow diagrams and block diagrams in the figures illustrate the architecture, functionality, and operation of possible implementations of apparatus, methods and computer program products according to various embodiments herein. In this regard, each block in the flowchart or block diagrams may represent a module, segment, or portion of code, which comprises one or more executable instructions for implementing the specified logical function(s). It should also be noted that in some alternative implementations, the functions noted in the block may occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and/or flowchart illustration, and combinations of blocks in the block diagrams and/or flowchart illustration, can be implemented by special purpose hardware-based systems which perform the specified functions or acts, or combinations of special purpose hardware and computer instructions.
In addition, the functional modules in the embodiments herein may be integrated together to form a single part, or the modules may exist alone, or two or more modules may be integrated to form a single part.
In the description of the present specification, a description referring to terms "one embodiment," "some embodiments," "examples," "specific examples," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms are not necessarily directed to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, the different embodiments or examples described in this specification and the features of the different embodiments or examples may be combined and combined by those skilled in the art without contradiction.
In summary, the foregoing embodiments of the present invention are described in detail with respect to different configurations of the method, the apparatus, the charger and the medium for suppressing soft start current of the three-phase PFC, however, the foregoing description is merely illustrative of the preferred embodiments of the present invention, and not limiting the scope of the present invention, which includes but is not limited to the configurations listed in the foregoing embodiments, and any changes and modifications made by those skilled in the art according to the foregoing disclosure are within the scope of the claims.

Claims (11)

1. The method for inhibiting the soft start current surge of the three-phase PFC is characterized by comprising the following steps of:
S1: updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value;
s2: performing loop calculation according to the updated direct current bus voltage command value to obtain a modulated wave signal of the three-phase PFC;
s3: acquiring the duty ratio of the three-phase PFC according to the modulated wave signal; generating a PWM signal according to the duty ratio, and driving the turn-off and turn-on of a power device of the three-phase PFC;
The updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value comprises the following steps:
If the direct current bus voltage command value is more than or equal to the direct current bus voltage target value, updating the direct current bus voltage command value according to a first preset strategy; otherwise, updating the direct current bus voltage command value according to a second preset strategy;
The updating the direct current bus voltage command value according to the second preset strategy comprises the following steps:
the dc bus voltage command value is updated by,
=/> +Δu
In the method, in the process of the invention,For the updated DC bus voltage command value,/>And delta u is a voltage increment for the direct current bus voltage command value, and is determined according to the direct current bus voltage target value, the direct current bus voltage actual value at the starting time and the three-phase PFC starting time.
2. The method of claim 1, further comprising the steps of, after receiving a start command, before executing step S1:
S01: judging whether the power grid voltage accords with a preset voltage stability index, if so, selecting an angle corresponding to a preset fixed position of the power grid voltage, and executing step S1 when the angle is detected; if not, executing step S02;
s02: the initial modulation degree is set and step S01 is performed.
3. The method for suppressing three-phase PFC soft start current surge according to claim 2, wherein the method for determining whether the grid voltage meets a preset voltage stability indicator includes:
acquiring a fundamental wave positive sequence reactive shaft component according to the power grid voltage;
calculating a power grid voltage angle according to the fundamental wave positive sequence reactive axis component;
If the power grid voltage frequency is maintained in a preset range through a plurality of preset periods or within a preset period duration, the power grid voltage accords with a preset voltage stability index; otherwise, the power grid voltage does not accord with a preset voltage stability index.
4. The method of suppressing the soft start current surge of the three-phase PFC according to claim 2, wherein in step S02, the method of obtaining the initial modulation degree includes obtaining by: In the above, the ratio of/> For the initial modulation degree,/>Is the effective value of the phase voltage of the power grid,/>The actual value of the DC bus voltage at the starting moment.
5. The method of claim 4, wherein in step S01, the method for selecting an angle corresponding to a predetermined fixed position of the grid voltage comprises:
and selecting an angle corresponding to the preset fixed position at any angle position in the power grid voltage angle range.
6. The method of claim 1, wherein the method for updating the dc bus voltage command value according to the first preset strategy comprises: the dc bus voltage command value is updated by,= />In the above, the ratio of/>The direct current bus voltage command value is given; /(I)Is the direct current bus voltage target value.
7. The method of claim 1, wherein the voltage increment is obtained by: Δu=－/>）/t
Where Deltau is the voltage increment,For the DC bus voltage target value,/>And t is the starting time of the three-phase PFC, and is the actual value of the voltage of the direct-current bus at the starting time.
8. A three-phase PFC soft start current surge suppression device is characterized by comprising,
The direct-current bus voltage soft start module is configured to update the direct-current bus voltage command value according to the direct-current bus voltage target value and the direct-current bus voltage command value;
The loop calculation module is configured to perform loop calculation according to the updated direct current bus voltage command value to acquire a modulated wave signal of the three-phase PFC;
the driving signal output module is configured to acquire the duty ratio of the three-phase PFC according to the modulated wave signal; the PWM signal is generated according to the duty ratio, and the power device of the three-phase PFC is driven to be turned off and on;
The updating the direct current bus voltage command value according to the direct current bus voltage target value and the direct current bus voltage command value comprises the following steps:
If the direct current bus voltage command value is more than or equal to the direct current bus voltage target value, updating the direct current bus voltage command value according to a first preset strategy; otherwise, updating the direct current bus voltage command value according to a second preset strategy;
The updating the direct current bus voltage command value according to the second preset strategy comprises the following steps:
the dc bus voltage command value is updated by,
= />+Δu
In the method, in the process of the invention,For the updated DC bus voltage command value,/>And delta u is a voltage increment for the direct current bus voltage command value, and is determined according to the direct current bus voltage target value, the direct current bus voltage actual value at the starting time and the three-phase PFC starting time.
9. The apparatus of claim 8, further comprising a grid voltage extraction module and a phase lock module;
the power grid voltage extraction module is configured to acquire fundamental wave positive sequence reactive shaft components according to power grid voltage;
the phase-locking module is configured to calculate a power grid voltage angle according to the fundamental wave positive sequence reactive axis component;
the phase locking module is further used for setting an initial modulation degree to enable the difference value between the power grid voltage and the three-phase PFC modulation voltage to meet a preset difference value threshold value when the power grid voltage does not meet a preset voltage stability index; and then the soft start module is used for realizing soft start current surge suppression of the three-phase PFC.
10. A charger characterized in that it adopts the three-phase PFC soft start current surge suppression method according to any one of claims 1 to 7 to control or includes the three-phase PFC soft start current surge suppression device according to any one of claims 8 to 9.
11. A computer readable storage medium having stored thereon computer executable instructions, characterized in that the steps of the three-phase PFC soft start current surge suppression method according to any of claims 1-7 are implemented when the computer executable instructions are executed.
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