CN116961206A - Control method of voltage conversion circuit, voltage conversion circuit and energy storage device - Google Patents
Control method of voltage conversion circuit, voltage conversion circuit and energy storage device Download PDFInfo
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- CN116961206A CN116961206A CN202311222541.4A CN202311222541A CN116961206A CN 116961206 A CN116961206 A CN 116961206A CN 202311222541 A CN202311222541 A CN 202311222541A CN 116961206 A CN116961206 A CN 116961206A
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- 238000006243 chemical reaction Methods 0.000 title claims abstract description 232
- 238000004146 energy storage Methods 0.000 title claims abstract description 25
- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000003990 capacitor Substances 0.000 claims description 118
- 238000010586 diagram Methods 0.000 description 4
- 230000002457 bidirectional effect Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- 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
- H02J7/36—Arrangements using end-cell switching
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- 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
- H02J7/007—Regulation of charging or discharging current or voltage
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Abstract
The application belongs to the technical field of circuits, and provides a control method of a voltage conversion circuit, the voltage conversion circuit and energy storage equipment. The control method of the voltage conversion circuit comprises the steps of obtaining a first voltage of a first battery and a second voltage of a second battery, comparing the first voltage with a first preset voltage, and generating a switch switching signal according to a comparison result so as to control the working state of the switch switching circuit. Through setting up the switch switching circuit for can be according to the voltage condition of first battery and second battery, control the operating condition of switch switching circuit, thereby change the connected mode of first direct current conversion circuit and second direct current conversion circuit, so that the voltage on the direct current bus can all be reached the settlement voltage with the first battery and the second battery that are in different voltage conditions, solved the narrower problem of direct current conversion circuit input and output voltage, thereby guarantee energy storage device's steady operation, energy storage device's application scenario has been widened.
Description
Technical Field
The application belongs to the technical field of circuits, and particularly relates to a control method of a voltage conversion circuit, the voltage conversion circuit and energy storage equipment.
Background
The direct current-direct current (DC/DC) converter is a common voltage conversion device, and can be widely used as a module in direct current products such as direct current charging piles or direct current solid-state transformers.
DC/DC conversion circuits currently in use are typically implemented using Boost circuits. However, when the input and output of the DC/DC conversion circuit differ by several times, the design difficulty of the DC/DC conversion circuit increases due to the limitation of the topology of the Boost circuit itself, the inductance design is not easy to be realized, and the temperature rise is excessive, resulting in higher cost.
It can be seen that the conventional DC/DC conversion circuit often has a problem of narrow input and output voltages.
Disclosure of Invention
The application aims to provide a control method of a voltage conversion circuit, the voltage conversion circuit and energy storage equipment, and aims to solve the problem that the input voltage and the output voltage of the existing DC/DC conversion circuit are usually narrower.
A first aspect of an embodiment of the present application provides a method for controlling a voltage conversion circuit, the voltage conversion circuit being applied to an energy storage device, the voltage conversion circuit including: the direct current conversion circuit comprises a first direct current conversion circuit, a second direct current conversion circuit, a direct current bus, a first bus capacitor, a second bus capacitor, a switch switching circuit and an alternating current conversion circuit, wherein a first end of the first direct current conversion circuit is used for being connected with a first battery, a second end of the first direct current conversion circuit is connected with the direct current bus, a first end of the second direct current conversion circuit is used for being connected with a second battery, a second end of the second direct current conversion circuit is connected with the direct current bus, a first end of the first bus capacitor is connected with an anode end of the direct current bus, a second end of the first bus capacitor is connected with a cathode end of the second bus capacitor, a first end of the alternating current conversion circuit is connected with the direct current bus, a second end of the alternating current conversion circuit is used for being connected with an alternating current load, and the switch switching circuit is respectively connected with the first direct current conversion circuit, the second direct current conversion circuit, the first bus and the first bus capacitor; the control method of the voltage conversion circuit comprises the following steps:
Acquiring a first voltage of the first battery and a second voltage of the second battery;
comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, wherein the switch switching signal is used for controlling the working state of the switch switching circuit, and the switch switching circuit is used for controlling the connection mode of the first direct current conversion circuit and the second direct current conversion circuit.
In one embodiment, the comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, where the switch switching signal is used to control an operating state of the switch switching circuit includes:
and when the first voltage and the second voltage are both greater than or equal to the first preset voltage, generating a first switch switching signal, wherein the first switch switching signal is used for controlling the switch switching circuit to work in a parallel working state.
In one embodiment, the comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, where the switch switching signal is used to control an operating state of the switch switching circuit includes:
And when the first voltage and the second voltage are smaller than the first preset voltage, generating a second switch switching signal, wherein the second switch switching signal is used for controlling the switch switching circuit to work in a series connection working state.
In one embodiment, the comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, where the switch switching signal is used to control an operating state of the switch switching circuit includes:
when the first voltage is greater than or equal to the first preset voltage and the second voltage is smaller than the first preset voltage, generating a third switch switching signal, wherein the third switch switching signal is used for controlling the switch switching circuit to work in a serial working state;
and when the second voltage is greater than or equal to the first preset voltage and the first voltage is smaller than the first preset voltage, generating a fourth switch switching signal, wherein the fourth switch switching signal is used for controlling the switch switching circuit to work in a series connection working state.
A second aspect of an embodiment of the present application provides a voltage conversion circuit applied to an energy storage device, the voltage conversion circuit including:
A first direct current conversion circuit, a first end of which is used for connecting a first battery;
the first end of the second direct current conversion circuit is used for being connected with a second battery;
the second end of the first direct current conversion circuit is connected with the direct current bus, and the second end of the second direct current conversion circuit is connected with the direct current bus;
the first end of the first bus capacitor is connected with the positive electrode end of the direct current bus;
the second end of the first bus capacitor is connected with the first end of the second bus capacitor, and the second end of the second bus capacitor is connected with the negative end of the direct current bus;
the first end of the alternating current conversion circuit is connected with the direct current bus, and the second end of the alternating current conversion circuit is used for being connected with an alternating current load;
the switch switching circuit is respectively connected with the first direct current conversion circuit, the second direct current conversion circuit, the direct current bus, the first bus capacitor and the second bus capacitor; the switch switching circuit is used for controlling the connection mode of the first direct current conversion circuit and the second direct current conversion circuit;
The main control circuit is respectively connected with the first battery, the second battery and the switch switching circuit and is used for acquiring the first voltage of the first battery and the second voltage of the second battery; comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, wherein the switch switching signal is used for controlling the working state of the switch switching circuit.
In one embodiment, the switch switching circuit includes:
the first end of the first switching unit is connected with the negative electrode end of the first direct current conversion circuit, and the second end of the first switching unit is connected with the first end of the second bus capacitor or the second end of the second bus capacitor;
and the first end of the second switching unit is connected with the positive electrode end of the second direct current conversion circuit, and the second end of the second switching unit is connected with the first end of the first bus capacitor or the second end of the first bus capacitor.
In one embodiment, the master control circuit is configured to generate a first switch switching signal when the first voltage and the second voltage are both greater than or equal to the first preset voltage, where the first switch switching signal is used to control a second end of the first switching unit to be connected with a second end of the second bus capacitor;
The first switch switching signal is also used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor.
In one embodiment, the master control circuit is configured to generate a second switch switching signal when the first voltage and the second voltage are both less than the first preset voltage, where the second switch switching signal is used to control the second end of the first switching unit to be connected with the first end of the second bus capacitor;
the second switch switching signal is also used for controlling the second end of the second switching unit to be connected with the second end of the first bus capacitor.
In one embodiment, the master control circuit is configured to generate a third switching signal when the first voltage is greater than or equal to the first preset voltage and the second voltage is less than the first preset voltage, where the third switching signal is used to control a second end of the first switching unit to be connected with a second end of the second bus capacitor;
the third switch switching signal is also used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor;
the main control circuit is further configured to generate a fourth switching signal when the second voltage is greater than or equal to the first preset voltage and the first voltage is less than the first preset voltage, where the fourth switching signal is used to control the second end of the first switching unit to be connected with the second end of the second bus capacitor;
The fourth switch switching signal is further used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor.
A third aspect of the embodiments of the present application provides an energy storage device, which is manufactured by using the control method of the voltage conversion circuit provided in any one of the embodiments;
alternatively, the energy storage device includes a voltage conversion circuit as provided in any of the embodiments above.
Compared with the prior art, the embodiment of the application has the beneficial effects that: the embodiment of the application provides a control method of a voltage conversion circuit, which is characterized in that a first voltage of a first battery and a second voltage of a second battery are obtained, the first voltage and the second voltage are compared with a first preset voltage, and a switch switching signal is generated according to a comparison result so as to control the working state of the switch switching circuit. Through setting up the switch switching circuit for can be according to the voltage condition of first battery and second battery, control the operating condition of switch switching circuit, thereby change the connected mode of first direct current conversion circuit and second direct current conversion circuit, so that the voltage on the direct current bus can all be reached the settlement voltage with the first battery and the second battery that are in different voltage conditions, solved the narrower problem of direct current conversion circuit input and output voltage, thereby guarantee energy storage device's steady operation, energy storage device's application scenario has been widened.
Drawings
Fig. 1 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present application;
fig. 2 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present application;
fig. 3 is a schematic diagram of a voltage conversion circuit according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a voltage conversion circuit according to an embodiment of the present application.
Description of the embodiments
In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the application is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.
It will be understood that when an element is referred to as being "mounted" or "disposed" on another element, it can be directly on the other element or be indirectly on the other element. When an element is referred to as being "connected to" another element, it can be directly connected to the other element or be indirectly connected to the other element.
It is to be understood that the terms "length," "width," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," and the like are merely for convenience in describing and simplifying the description based on the orientation or positional relationship shown in the drawings, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus are not to be construed as limiting the application.
Furthermore, the terms "first," "second," and the like, are used for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include one or more such feature. In the description of the present application, the meaning of "a plurality" is two or more, unless explicitly defined otherwise.
The direct current-direct current (DC/DC) converter is a common voltage conversion device, and can be widely used as a module in direct current products such as direct current charging piles or direct current solid-state transformers.
DC/DC conversion circuits currently in use are typically implemented using Boost circuits. However, when the input and output of the DC/DC conversion circuit differ by several times, the design difficulty of the DC/DC conversion circuit is increased due to the limitation of the topology of the Boost circuit itself, which is not easy to be implemented, and the temperature rise is excessive, which results in higher cost.
It can be seen that the conventional DC/DC conversion circuit often has a problem of narrow input and output voltages.
In order to solve the above technical problems, referring to fig. 1, an embodiment of the present application provides a control method of a voltage conversion circuit, where the voltage conversion circuit is applied to an energy storage device, the voltage conversion circuit includes: the first dc conversion circuit 10, the second dc conversion circuit 20, a dc BUS (bus+, BUS-), a first BUS capacitor 40, a second BUS capacitor 50, a switching circuit 30, and an ac conversion circuit 60.
Specifically, a first end of the first dc conversion circuit 10 is used to connect to the first battery 100, and a second end of the first dc conversion circuit 10 is connected to a dc BUS (bus+, BUS-); the first end of the second direct current conversion circuit 20 is used for connecting the second battery 200, and the second end of the second direct current conversion circuit 20 is connected with a direct current BUS (BUS+, BUS-); the first end of the first BUS capacitor 40 is connected with the positive electrode end BUS+ of the direct current BUS, the second end of the first BUS capacitor 40 is connected with the first end of the second BUS capacitor 50, and the second end of the second BUS capacitor 50 is connected with the negative electrode end BUS-of the direct current BUS; a first end of the ac conversion circuit 60 is connected to a dc BUS (bus+, BUS-) and a second end of the ac conversion circuit 60 is connected to an ac load 300; the switching circuit 30 is connected to the first dc conversion circuit 10, the second dc conversion circuit 20, a dc BUS (bus+, BUS-), the first BUS capacitor 40, and the second BUS capacitor 50, respectively.
Further, the control method of the voltage conversion circuit includes: a first voltage of the first battery 100 is acquired, and a second voltage of the second battery 200 is acquired. Comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, wherein the switch switching signal is used for controlling the working state of a switch switching circuit 30, and the switch switching circuit 30 is used for controlling the connection mode of the first direct current conversion circuit 10 and the second direct current conversion circuit 20; the first preset voltage is related to one half of the set voltage of the dc BUS (bus+, BUS-) and may be obtained by subtracting a compensation difference from one half of the set voltage of the dc BUS (bus+, BUS-).
In the present embodiment, the first dc conversion circuit 10 and the second dc conversion circuit 20 are used to perform dc conversion processing on the first voltage and the second voltage provided by the first battery 100 and the second battery 200, respectively, and then charge the first BUS capacitor 40 and the second BUS capacitor 50 on the dc BUS (bus+, BUS-) so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage, and then the ac conversion circuit 60 is used to perform ac conversion processing according to the voltage on the dc BUS (bus+, BUS-) to supply power to the connected ac load 300, thereby realizing that the battery supplies power to the ac load 300.
In this embodiment, since the voltages of the first battery 100 and the second battery 200 will change, the different voltages need to pass through the first dc conversion circuit 10 and the second dc conversion circuit 20, so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage to ensure the stable operation of the circuit.
In the present embodiment, the switching circuit 30 is used to control the connection modes of the first dc conversion circuit 10 and the second dc conversion circuit 20. Specifically, the operation state of the switch switching circuit 30 is controlled by acquiring the first voltage of the first battery 100 and the second voltage of the second battery 200, comparing the first voltage and the second voltage with the first preset voltage, and generating a switch switching signal according to the comparison result. According to the application, by arranging the switch switching circuit 30, the working state of the switch switching circuit 30 can be controlled according to the voltage conditions of the first battery 100 and the second battery 200, so that the connection modes of the first direct current conversion circuit 10 and the second direct current conversion circuit 20 are changed, the first battery 100 and the second battery 200 which are in different voltage conditions can reach the set voltage with the voltage on the direct current BUS (BUS+, BUS-) and the problem that the input and output voltages of the direct current conversion circuit are narrower is solved. Thus, the stable operation of the circuit is ensured, and the application only adds the switch switching circuit 30, does not need additional complex design, and simplifies the circuit.
In one embodiment, comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to the comparison result, where the switch switching signal is used to control the operating state of the switch switching circuit 30 includes: when the first voltage and the second voltage are both greater than or equal to the first preset voltage, a first switch switching signal is generated, and the first switch switching signal is used for controlling the switch switching circuit 30 to work in the parallel working state.
In this embodiment, when the first voltage and the second voltage are both greater than or equal to the first preset voltage, it is indicated that the voltages of the first battery 100 and the second battery 200 are both greater, the voltages of the first battery 100 and the second battery 200 are closer to the voltages on the dc BUS (bus+, BUS-) and a first switch switching signal is generated at this time, and the first switch switching signal is used to control the switch switching circuit 30 to operate in the parallel operation state. When the switching circuit 30 is operated in the parallel operation state, the first dc conversion circuit 10 and the second dc conversion circuit 20 are in the parallel state, and the first dc conversion circuit 10 and the second dc conversion circuit 20 charge the first BUS capacitor 40 and the second BUS capacitor 50 together so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage.
In the present embodiment, when the voltages of the first battery 100 and the second battery 200 are closer to the voltages on the dc buses (bus+, BUS-) then the first dc conversion circuit 10 and the second dc conversion circuit 20 operate in a parallel configuration, and the first dc conversion circuit 10 and the second dc conversion circuit 20 charge the dc buses (bus+, BUS-) at the same time. If the input and output voltages are relatively close, the power device can be reduced in size and specification, and space and cost are saved when the same power is transmitted. Therefore, the voltage power device can save the type selection and design difficulty of the voltage power device by judging the input and output voltage difference and adjusting the structure. In the parallel operation state, the voltage difference between the input first direct current conversion circuit 10 and the second direct current conversion circuit 20 and the direct current BUS (bus+, BUS-) is smaller, and the first direct current conversion circuit 10 and the second direct current conversion circuit 20 can jointly bear power when connected in parallel, so that the current design takes half of the current, and the power device selection cost and the design difficulty are saved.
In one embodiment, the first preset voltage may be obtained by subtracting a compensation difference from one half of the set voltage of the dc BUS (bus+, BUS-) and by setting the first preset voltage to be obtained by subtracting one compensation difference from one half of the set voltage of the dc BUS (bus+, BUS-) and by controlling the connection states of the first dc conversion circuit and the second dc conversion circuit more accurately, when the voltage phase difference between the first dc conversion circuit 10 and the second dc conversion circuit 20 and the dc BUS (bus+, BUS-) is smaller, the first dc conversion circuit 10 and the second dc conversion circuit 20 are controlled to share power in parallel, and the current design is half of that, so that the power device type selection cost and the design difficulty are saved.
In one embodiment, comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to the comparison result, where the switch switching signal is used to control the operating state of the switch switching circuit 30 includes: when the first voltage and the second voltage are both smaller than the first preset voltage, a second switch switching signal is generated, and the second switch switching signal is used for controlling the switch switching circuit 30 to work in the series working state.
In this embodiment, when the first voltage and the second voltage are both smaller than the first preset voltage, it is indicated that the voltages of the first battery 100 and the second battery 200 are both smaller, the voltages of the first battery 100 and the second battery 200 are far different from the voltages on the dc BUS (bus+, BUS-) and a second switch switching signal is generated at this time, and the second switch switching signal is used to control the switch switching circuit 30 to operate in the series operation state. When the switch switching circuit 30 is operated in the series operation state, the first dc conversion circuit 10 and the second dc conversion circuit 20 are in the series state, and at this time, the first dc conversion circuit 10 charges the first BUS capacitor 40, and the second dc conversion circuit 20 charges the second BUS capacitor 50, so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage.
In the present embodiment, when the voltages of the first battery 100 and the second battery 200 differ from the voltages on the dc buses (bus+, BUS-) by a relatively large amount, if the first dc conversion circuit 10 and the second dc conversion circuit 20 are still in a series state, the first dc conversion circuit 10 and the second dc conversion circuit 20 need to be designed with a relatively complex circuit structure due to a relatively large input/output voltage difference, or a device with a relatively high voltage specification is used, thereby increasing the circuit cost.
For example, the voltages of the first battery 100 and the second battery 200 are 90V, and the set voltage on the dc BUS (bus+, BUS-) is 450V, at which time 450V is 5 times the 90V. If the first dc conversion circuit 10 and the second dc conversion circuit 20 are in a series state, the input current is substantially unchanged, and the normal operation is transmitted. However, the input of 90V, the output of the first dc conversion circuit 10 and the output of the second dc conversion circuit 20 only need 450V/2=225V, so that the cost of materials and the difficulty of design can be greatly saved.
In one embodiment, comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to the comparison result, where the switch switching signal is used to control the operating state of the switch switching circuit 30 includes: when the first voltage is greater than or equal to the first preset voltage and the second voltage is less than the first preset voltage, a third switch switching signal is generated, and the third switch switching signal is used for controlling the switch switching circuit 30 to work in the parallel working state. When the second voltage is greater than or equal to the first preset voltage and the first voltage is less than the first preset voltage, a fourth switch switching signal is generated, and the fourth switch switching signal is used for controlling the switch switching circuit 30 to work in a parallel working state.
In this embodiment, when any one of the first voltage and the second voltage is smaller than the first preset voltage and any one of the first voltage and the second voltage is greater than or equal to the first preset voltage, it is indicated that the voltage of one of the first battery 100 and the second battery 200 is lower, and at this time, in order to solve the imbalance problem of the first battery and the second battery, a third switch switching signal or a fourth switch switching signal is generated, and both the third switch switching signal and the fourth switch switching signal are used to control the switch switching circuit 30 to operate in the parallel operation state. At this time, the first and second dc conversion circuits 10 and 20 charge the first and second BUS capacitors 40 and 50 at the same time so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage. According to the design, the material cost and the design difficulty can be greatly saved.
The embodiment of the application also provides a voltage conversion circuit, referring to fig. 2, the voltage conversion circuit is applied to energy storage equipment, and the voltage conversion circuit comprises: the first dc conversion circuit 10, the second dc conversion circuit 20, a dc BUS (bus+, BUS-), a first BUS capacitor 40, a second BUS capacitor 50, a switching circuit 30, an ac conversion circuit 60, and a main control circuit 70.
Specifically, a first end of the first dc link circuit 10 is used to connect the first battery 100. The first end of the second dc conversion circuit 20 is used for connecting the second battery 200; the second end of the first direct current conversion circuit 10 is connected with a direct current BUS (BUS+, BUS-) and the second end of the second direct current conversion circuit 20 is connected with a direct current BUS (BUS+, BUS-); the first end of the first BUS capacitor 40 is connected with the positive electrode end BUS+ of the direct current BUS; the second end of the first BUS capacitor 40 is connected with the first end of the second BUS capacitor 50, and the second end of the second BUS capacitor 50 is connected with the negative electrode end BUS-of the direct current BUS; a first end of the ac conversion circuit 60 is connected to a dc BUS (bus+, BUS-) and a second end of the ac conversion circuit 60 is connected to an ac load 300; the switching circuit 30 is connected to the first dc conversion circuit 10, the second dc conversion circuit 20, a dc BUS (bus+, BUS-), the first BUS capacitor 40, and the second BUS capacitor 50, respectively; the switch switching circuit 30 is used for controlling the connection modes of the first direct current conversion circuit 10 and the second direct current conversion circuit 20; the main control circuit 70 is respectively connected with the first battery 100, the second battery 200 and the switch switching circuit 30, and the main control circuit 70 is used for obtaining a first voltage of the first battery 100 and obtaining a second voltage of the second battery 200; the first voltage and the second voltage are compared with a first preset voltage, and a switch switching signal is generated according to the comparison result, wherein the switch switching signal is used for controlling the working state of the switch switching circuit 30.
In the present embodiment, the first dc conversion circuit 10 is a bidirectional conversion circuit, and the first dc conversion circuit 10 is configured to perform dc conversion processing on a first voltage of the first battery 100 and output the processed voltage to a dc BUS (bus+, BUS "), or the first dc conversion circuit 10 is configured to perform dc conversion processing on a voltage on the dc BUS (bus+, BUS-) and output the processed voltage to the first battery 100. The second dc conversion circuit 20 is a bidirectional conversion circuit, and the second dc conversion circuit 20 is configured to perform dc conversion on the second voltage of the second battery 200 and output the second voltage to the dc BUS (bus+, BUS "), or the second dc conversion circuit 20 is configured to perform dc conversion on the voltage on the dc BUS (bus+, BUS-) and output the second voltage to the second battery 200.
In this embodiment, the ac conversion circuit 60 is a bidirectional conversion circuit, the ac conversion circuit 60 is configured to ac-convert a voltage on a dc BUS (bus+, BUS-) and output the voltage to the ac load 300, and when the ac load 300 becomes a power grid, the ac conversion circuit 60 is also configured to ac-dc convert the ac of the voltage and output the ac to the dc BUS (bus+, BUS-).
In this embodiment, since the voltages of the first battery 100 and the second battery 200 will change, the different voltages need to pass through the first dc conversion circuit 10 and the second dc conversion circuit 20 to make the voltage on the dc BUS (bus+, BUS-) reach the set voltage, so as to ensure the stable operation of the circuit.
In the present embodiment, the main control circuit 70 is used for controlling the operation state of the switch switching circuit 30, and the switch switching circuit 30 is used for controlling the connection modes of the first dc conversion circuit 10 and the second dc conversion circuit 20. Specifically, the main control circuit 70 obtains the first voltage of the first battery 100 and the second voltage of the second battery 200, compares the first voltage and the second voltage with a first preset voltage, and generates a switch switching signal according to the comparison result to control the working state of the switch switching circuit 30. According to the application, by arranging the switch switching circuit 30, the working state of the switch switching circuit 30 can be controlled according to the voltage conditions of the first battery 100 and the second battery 200, so that the connection modes of the first direct current conversion circuit 10 and the second direct current conversion circuit 20 are changed, the first battery 100 and the second battery 200 which are in different voltage conditions can enable the voltage on the direct current buses (BUS+, BUS-) to reach the set voltage, the problem that the input and output voltages of the direct current conversion circuit are narrower is solved, and the stable operation of the circuit is ensured; in addition, the application only adds the switch switching circuit 30, does not need additional complex design, and simplifies the circuit.
In one embodiment, referring to fig. 3, the switch switching circuit 30 includes: a first switching unit 31 and a second switching unit 32.
Specifically, the first end of the first switching unit 31 is connected to the negative terminal of the first dc link circuit 10, and the second end of the first switching unit 31 is connected to the first end of the second bus capacitor 50 or the second end of the second bus capacitor 50. The first end of the second switching unit 32 is connected to the positive terminal of the second dc conversion circuit 20, and the second end of the second switching unit 32 is connected to the first end of the first bus capacitor 40 or the second end of the first bus capacitor 40.
In the present embodiment, by setting the switch switching circuit 30 to the first switching unit 31 and the second switching unit 32, the connection modes of the first dc conversion circuit 10 and the second dc conversion circuit 20 can be controlled, so that when the first voltage and the second voltage are in different ranges, the first voltage and the second voltage can be raised to the set voltages of the dc buses (bus+, BUS-) and the application scenario of the circuit is increased.
In one embodiment, the master control circuit 70 is configured to generate a first switch switching signal when the first voltage and the second voltage are both greater than or equal to a first preset voltage, where the first switch switching signal is used to control the second end of the first switching unit 31 to be connected to the second end of the second bus capacitor 50; the first switch switching signal is further used to control the second terminal of the second switching unit 32 to be connected to the first terminal of the first bus capacitor 40.
In this embodiment, the first switch switching signal is used to control the second end of the first switching unit 31 to be connected to the second end of the second bus capacitor 50; the first switch switching signal is further used to control the second terminal of the second switching unit 32 to be connected to the first terminal of the first bus capacitor 40. Thus, the switch switching circuit 30 is operated in the parallel operation state, and the first dc conversion circuit 10 and the second dc conversion circuit 20 are in the parallel connection mode, so that the first dc conversion circuit 10 and the second dc conversion circuit 20 charge the first BUS capacitor 40 and the second BUS capacitor 50 together, so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage.
In one embodiment, the master control circuit 70 is configured to generate a second switching signal when the first voltage and the second voltage are both less than the first preset voltage, where the second switching signal is used to control the second terminal of the first switching unit 31 to be connected to the first terminal of the second bus capacitor 50; the second switch signal is further used to control the second terminal of the second switching unit 32 to be connected to the second terminal of the first bus capacitor 40.
In this embodiment, the second switch switching signal is used to control the second end of the first switching unit 31 to be connected to the first end of the second bus capacitor 50; the second switch signal is further used to control the second terminal of the second switching unit 32 to be connected to the second terminal of the first bus capacitor 40. Thus, the switch switching circuit 30 is operated in a series operation state, and the first dc conversion circuit 10 and the second dc conversion circuit 20 are in a series connection mode, so that the first dc conversion circuit 10 charges the first BUS capacitor 40, and the second dc conversion circuit 20 charges the second BUS capacitor 50, so that the voltage on the dc BUS (bus+, BUS-) reaches the set voltage.
In one embodiment, the master control circuit 70 is configured to generate a third switching signal when the first voltage is greater than or equal to a first preset voltage and the second voltage is less than the first preset voltage, where the third switching signal is used to control the second end of the first switching unit 31 to be connected to the second end of the second bus capacitor 50; the third switching signal is further used to control the second terminal of the second switching unit 32 to be connected to the first terminal of the first bus capacitor 40. The main control circuit 70 is further configured to generate a fourth switching signal when the second voltage is greater than or equal to the first preset voltage and the first voltage is less than the first preset voltage, where the fourth switching signal is used to control the second end of the first switching unit 31 to be connected to the second end of the second bus capacitor 50; the fourth switch switching signal is further used for controlling the second terminal of the second switching unit 32 to be connected to the first terminal of the first bus capacitor 40.
In this embodiment, when the voltage of any one of the batteries is lower than the first preset voltage, the second end of the first switching unit 31 is controlled to be connected with the second end of the second BUS capacitor 50, the second end of the second switching unit 32 is controlled to be connected with the first end of the first BUS capacitor 40, the switching circuit 30 is operated in the parallel operation state, and the first dc conversion circuit 10 and the second dc conversion circuit 20 are in the parallel connection mode, so that the first dc conversion circuit 10 and the second dc conversion circuit 20 charge the first BUS capacitor 40 and the second BUS capacitor 50 at the same time, so that the voltage on the dc buses (bus+, BUS-) reaches the set voltage.
In one embodiment, referring to fig. 4, the first direct current conversion circuit 10 includes: the first capacitor C1, the first inductor L1, the first switching tube Q1 and the second switching tube Q2.
Specifically, the first end of the first capacitor C1 and the first end of the first inductor L1 are commonly connected to the positive end of the first battery 100, the second end of the first inductor L1 and the first end of the first switching tube Q1 are commonly connected to the first end of the second switching tube Q2, the second end of the second switching tube Q2 is connected to the switching circuit 30, and the second end of the first capacitor C1 and the second end of the first switching tube Q1 are commonly connected to the negative end of the first battery 100.
In one embodiment, referring to fig. 4, the second dc conversion circuit 20 includes: the second capacitor C2, the second inductor L2, the third switching tube Q3 and the fourth switching tube Q4.
Specifically, the first end of the second capacitor C2 and the first end of the second inductor L2 are commonly connected to the positive end of the second battery 200, the second end of the second inductor L2 and the first end of the third switching tube Q3 are commonly connected to the first end of the fourth switching tube Q4, the second end of the fourth switching tube Q4 is connected to the switching circuit 30, and the second end of the second capacitor C2 and the second end of the third switching tube Q3 are commonly connected to the negative end of the second battery 200.
In one embodiment, referring to fig. 4, the first bus capacitor 40 includes: a sixth capacitance C6; the second bus bar capacitor 50 includes: and a seventh capacitor C7. Specifically, the first end of the sixth capacitor C6 is connected to the positive terminal bus+ of the dc BUS, the second end of the sixth capacitor C6 is connected to the first end of the second BUS capacitor 50, and the second end of the seventh capacitor C7 is connected to the negative terminal BUS of the dc BUS.
In one embodiment, referring to fig. 4, the switch switching circuit 30 includes: a first switch K1 and a second switch K2.
Specifically, for example, the first switching unit 31 includes a first switch K1, the second switching unit 32 includes a second switch K2, a first end of the first switch K1 is connected to the negative terminal of the first dc link converter circuit 10, and a second end of the first switch K1 is connected to the first end of the seventh capacitor C7 or the second end of the seventh capacitor C7; the first end of the second switch K2 is connected to the positive terminal of the second dc conversion circuit 20, and the second end of the second switch K2 is connected to the first end of the sixth capacitor C6 or the second end of the sixth capacitor C6.
In one embodiment, referring to fig. 4, the first switch K1 and the second switch K2 are single pole double throw switches.
In one embodiment, referring to fig. 4, the ac conversion circuit 60 includes: fifth switching tube Q5, sixth switching tube Q6, seventh switching tube Q7, eighth switching tube Q8, ninth switching tube Q9, tenth switching tube Q10, third inductance L3, fourth inductance L4, fifth inductance L5, third capacitance C3, fourth capacitance C4 and fifth capacitance C5.
Specifically, the first end of the fifth switching tube Q5, the first end of the seventh switching tube Q7 and the first end of the ninth switching tube Q9 are all connected to the positive terminal bus+ of the dc BUS, the second end of the fifth switching tube Q5 is connected to the first end of the sixth switching tube Q6, the second end of the seventh switching tube Q7 is connected to the first end of the eighth switching tube Q8, the second end of the ninth switching tube Q9 is connected to the first end of the tenth switching tube Q10, the second end of the sixth switching tube Q6, the second end of the eighth switching tube Q8 and the second end of the tenth switching tube Q10 are all connected to the negative terminal BUS-of the dc BUS, the first end of the third inductor L3 is connected to the second end of the fifth switching tube Q5, the first end of the fourth inductor L4 is connected to the second end of the seventh switching tube Q7, the first end of the fifth inductor L5 is connected to the second end of the ninth switching tube Q8, the second end of the third inductor L3 is connected to the second end of the fifth switching tube Q9, the second end of the third inductor L3 is connected to the fourth end of the fourth inductor C3 and the fifth capacitor C4 is connected to the fifth end of the fourth capacitor C3 and the fifth capacitor C4, and the fourth end of the fourth capacitor C3 is connected to the fifth end of the fourth capacitor C4 is connected to the fifth end of the fifth capacitor 300.
The embodiment of the application also provides energy storage equipment, which is manufactured by adopting the control method of the voltage conversion circuit provided by any embodiment;
alternatively, the energy storage device comprises a voltage conversion circuit as provided in any of the embodiments described above.
In this embodiment, the energy storage device is manufactured by adopting the control method of the voltage conversion circuit provided in any one of the embodiments; alternatively, the voltage conversion circuit provided in any of the above embodiments is integrated in an energy storage device, and the working state of the switch switching circuit 30 is controlled by acquiring the first voltage of the first battery 100 and the second voltage of the second battery 200, comparing the first voltage and the second voltage with the first preset voltage, and generating a switch switching signal according to the comparison result. By arranging the switch switching circuit 30, the working state of the switch switching circuit 30 can be controlled according to the voltage conditions of the first battery 100 and the second battery 200, so that the connection modes of the first direct current conversion circuit 10 and the second direct current conversion circuit 20 are changed, the first battery 100 and the second battery 200 which are in different voltage conditions can reach the set voltage with the voltage on the direct current BUS (BUS+, BUS-) and the problem that the input voltage and the output voltage of the direct current conversion circuit are narrower is solved, the stable operation of the energy storage device is ensured, and the application scene of the energy storage device is widened.
In the foregoing embodiments, the descriptions of the embodiments are emphasized, and in part, not described or illustrated in any particular embodiment, reference is made to the related descriptions of other embodiments.
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 over 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.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The above embodiments are only for illustrating the technical solution of the present application, and are not limiting; although the application 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 application, and are intended to be included in the scope of the present application.
Claims (10)
1. A control method of a voltage conversion circuit, wherein the voltage conversion circuit is applied to an energy storage device, the voltage conversion circuit comprising: the direct current conversion circuit comprises a first direct current conversion circuit, a second direct current conversion circuit, a direct current bus, a first bus capacitor, a second bus capacitor, a switch switching circuit and an alternating current conversion circuit, wherein a first end of the first direct current conversion circuit is used for being connected with a first battery, a second end of the first direct current conversion circuit is connected with the direct current bus, a first end of the second direct current conversion circuit is used for being connected with a second battery, a second end of the second direct current conversion circuit is connected with the direct current bus, a first end of the first bus capacitor is connected with an anode end of the direct current bus, a second end of the first bus capacitor is connected with a cathode end of the second bus capacitor, a first end of the alternating current conversion circuit is connected with the direct current bus, a second end of the alternating current conversion circuit is used for being connected with an alternating current load, and the switch switching circuit is respectively connected with the first direct current conversion circuit, the second direct current conversion circuit, the first bus and the first bus capacitor; the control method of the voltage conversion circuit comprises the following steps:
Acquiring a first voltage of the first battery and a second voltage of the second battery;
comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, wherein the switch switching signal is used for controlling the working state of the switch switching circuit, and the switch switching circuit is used for controlling the connection mode of the first direct current conversion circuit and the second direct current conversion circuit.
2. The method for controlling a voltage conversion circuit according to claim 1, wherein comparing the first voltage and the second voltage with a first preset voltage and generating a switch switching signal according to a comparison result, the switch switching signal being used for controlling an operation state of the switch switching circuit comprises:
and when the first voltage and the second voltage are both greater than or equal to the first preset voltage, generating a first switch switching signal, wherein the first switch switching signal is used for controlling the switch switching circuit to work in a parallel working state.
3. The method for controlling a voltage conversion circuit according to claim 1, wherein comparing the first voltage and the second voltage with a first preset voltage and generating a switch switching signal according to a comparison result, the switch switching signal being used for controlling an operation state of the switch switching circuit comprises:
And when the first voltage and the second voltage are smaller than the first preset voltage, generating a second switch switching signal, wherein the second switch switching signal is used for controlling the switch switching circuit to work in a series connection working state.
4. The method for controlling a voltage conversion circuit according to claim 1, wherein comparing the first voltage and the second voltage with a first preset voltage and generating a switch switching signal according to a comparison result, the switch switching signal being used for controlling an operation state of the switch switching circuit comprises:
when the first voltage is greater than or equal to the first preset voltage and the second voltage is smaller than the first preset voltage, generating a third switch switching signal, wherein the third switch switching signal is used for controlling the switch switching circuit to work in a parallel working state;
and when the second voltage is greater than or equal to the first preset voltage and the first voltage is smaller than the first preset voltage, generating a fourth switch switching signal, wherein the fourth switch switching signal is used for controlling the switch switching circuit to work in a parallel working state.
5. A voltage conversion circuit for use in an energy storage device, the voltage conversion circuit comprising:
A first direct current conversion circuit, a first end of which is used for connecting a first battery;
the first end of the second direct current conversion circuit is used for being connected with a second battery;
the second end of the first direct current conversion circuit is connected with the direct current bus, and the second end of the second direct current conversion circuit is connected with the direct current bus;
the first end of the first bus capacitor is connected with the positive electrode end of the direct current bus;
the second end of the first bus capacitor is connected with the first end of the second bus capacitor, and the second end of the second bus capacitor is connected with the negative end of the direct current bus;
the first end of the alternating current conversion circuit is connected with the direct current bus, and the second end of the alternating current conversion circuit is used for being connected with an alternating current load;
the switch switching circuit is respectively connected with the first direct current conversion circuit, the second direct current conversion circuit, the direct current bus, the first bus capacitor and the second bus capacitor; the switch switching circuit is used for controlling the connection mode of the first direct current conversion circuit and the second direct current conversion circuit;
The main control circuit is respectively connected with the first battery, the second battery and the switch switching circuit and is used for acquiring the first voltage of the first battery and the second voltage of the second battery; comparing the first voltage and the second voltage with a first preset voltage, and generating a switch switching signal according to a comparison result, wherein the switch switching signal is used for controlling the working state of the switch switching circuit.
6. The voltage conversion circuit of claim 5, wherein the switch-switching circuit comprises:
the first end of the first switching unit is connected with the negative electrode end of the first direct current conversion circuit, and the second end of the first switching unit is connected with the first end of the second bus capacitor or the second end of the second bus capacitor;
and the first end of the second switching unit is connected with the positive electrode end of the second direct current conversion circuit, and the second end of the second switching unit is connected with the first end of the first bus capacitor or the second end of the first bus capacitor.
7. The voltage conversion circuit according to claim 6, wherein the master control circuit is configured to generate a first switching signal when the first voltage and the second voltage are both greater than or equal to the first preset voltage, the first switching signal being configured to control a second end of the first switching unit to be connected to a second end of the second bus capacitor;
The first switch switching signal is also used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor.
8. The voltage conversion circuit according to claim 6, wherein the master control circuit is configured to generate a second switching signal when the first voltage and the second voltage are both less than the first preset voltage, the second switching signal being configured to control a second end of the first switching unit to be connected to a first end of the second bus capacitor;
the second switch switching signal is also used for controlling the second end of the second switching unit to be connected with the second end of the first bus capacitor.
9. The voltage conversion circuit according to claim 6, wherein the master control circuit is configured to generate a third switching signal when the first voltage is greater than or equal to the first preset voltage and the second voltage is less than the first preset voltage, the third switching signal being configured to control the second terminal of the first switching unit to be connected to the second terminal of the second bus capacitor;
the third switch switching signal is also used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor;
The main control circuit is further configured to generate a fourth switching signal when the second voltage is greater than or equal to the first preset voltage and the first voltage is less than the first preset voltage, where the fourth switching signal is used to control the second end of the first switching unit to be connected with the second end of the second bus capacitor;
the fourth switch switching signal is further used for controlling the second end of the second switching unit to be connected with the first end of the first bus capacitor.
10. An energy storage device manufactured by the control method of the voltage conversion circuit according to any one of claims 1 to 4;
alternatively, the energy storage device comprises a voltage conversion circuit as claimed in any of claims 5-9.
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