Transformer circuit control method and device, parallel UPS system

Abstract

The present invention provides a transformer circuit control method and device, and a parallel UPS system, wherein the method is applied to any transformer circuit in a parallel transformer circuit, wherein the parallel transformer circuit includes at least two transformer circuits, each transformer circuit is connected in parallel to the same battery pack, and the battery pack has no neutral line; the method includes: obtaining the real-time bus voltage corresponding to the target transformer circuit, determining the current given value based on the real-time bus voltage and the preset bus voltage given value; obtaining the positive bus inductance current and the negative bus inductance current corresponding to the target transformer circuit, controlling the first controllable switch of the target transformer circuit based on the current given value and the positive bus inductance current, and controlling the second controllable switch of the target transformer circuit based on the current given value and the negative bus inductance current, so as to realize the current sharing of the positive and negative bus inductance currents. The present invention can effectively suppress the DC circulating current between the transformer circuits caused by the shared battery pack.

Description

Technical Field

[0001] The present invention belongs to the technical field of power electronics, and more specifically, relates to a voltage conversion circuit control method and device, and a parallel UPS system. Background Art

[0002] With the continuous development of communication electronic technology, it is becoming more and more important to provide a continuous and stable power supply for the equipment or the entire electronic system. A single device is limited by its load-carrying capacity and can no longer meet the continuous operation of the equipment or system. Therefore, in order to improve the load-carrying capacity, parallel technology came into being.

[0003] However, the inventors of the present application discovered that, when at least two transformer circuits share the same battery pack and the shared battery pack has no neutral line, DC circulation current is easily generated between the various transformer circuits. Therefore, how to effectively suppress the DC circulation current between the transformer circuits under the condition of sharing a battery pack has become a problem that technical personnel in this field urgently need to solve. Summary of the invention

[0004] The object of the present invention is to provide a transformer circuit control method and device, and a parallel UPS system, so as to solve the DC circulation problem between transformer circuits under the condition of sharing a battery group existing in the prior art.

[0005] To achieve the above-mentioned purpose, the technical solution adopted by the present invention is to provide a transformer circuit control method, which is applied to any transformer circuit in a parallel transformer circuit, wherein the parallel transformer circuit includes at least two transformer circuits, each transformer circuit includes at least one first controllable switch, at least one second controllable switch, at least one positive bus inductor, at least one negative bus inductor, at least one capacitor corresponding to the positive bus inductor, and at least one capacitor corresponding to the negative bus inductor, wherein the first controllable switch is used to regulate the positive bus inductor current, and the second controllable switch is used to regulate the negative bus inductor current, and each transformer circuit is connected in parallel to the same battery pack, and the battery pack has no neutral line;

[0006] The voltage conversion circuit control method comprises:

[0007] Acquire a real-time bus voltage corresponding to the target transformer circuit, and determine a current given value based on the real-time bus voltage and a preset bus voltage given value;

[0008] A positive bus inductor current and a negative bus inductor current corresponding to a target transformer circuit are obtained, and a first controllable switch of the target transformer circuit is controlled based on the current given value and the positive bus inductor current, and a second controllable switch of the target transformer circuit is controlled based on the current given value and the negative bus inductor current to achieve current sharing of the positive and negative bus inductor currents.

[0009] Optionally, the controlling the first controllable switch of the target transformer circuit based on the current given value and the positive bus inductor current includes:

[0010] Determining a first controllable switch adjustment amount based on the current given value and the positive bus inductance current;

[0011] An unbalanced adjustment amount and a reference adjustment amount corresponding to a target transformer circuit are obtained, and a first controllable switch of the target transformer circuit is controlled based on the first controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount.

[0012] Optionally, the controlling the first controllable switch of the target transformer circuit based on the first controllable switch adjustment amount, the unbalance adjustment amount and the reference adjustment amount includes:

[0013] The sum of the first controllable switch adjustment amount and the reference adjustment amount is used as the first controllable switch basic adjustment amount;

[0014] The first controllable switch of the target transformer circuit is controlled based on the sum of the first controllable switch basic adjustment amount and the unbalanced adjustment amount.

[0015] Optionally, the controlling the second controllable switch of the target transformer circuit based on the current given value and the negative bus inductor current includes:

[0016] Determining a second controllable switch adjustment amount based on the current given value and the negative bus inductor current;

[0017] An unbalanced adjustment amount and a reference adjustment amount corresponding to the target transformer circuit are obtained, and the second controllable switch of the target transformer circuit is controlled based on the second controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount.

[0018] Optionally, the controlling the second controllable switch of the target transformer circuit based on the second controllable switch adjustment amount, the unbalance adjustment amount and the reference adjustment amount includes:

[0019] The sum of the second controllable switch adjustment amount and the reference adjustment amount is used as the second controllable switch basic adjustment amount;

[0020] The second controllable switch of the target transformer circuit is controlled based on the difference between the second controllable switch basic adjustment amount and the unbalanced adjustment amount.

[0021] Optionally, a method for determining an unbalanced adjustment amount corresponding to a target transformer circuit is as follows:

[0022] The real-time voltage difference between the positive and negative buses in the real-time bus voltage is calculated, and the unbalanced adjustment amount corresponding to the target transformer circuit is determined according to the real-time voltage difference.

[0023] Optionally, a method for determining a reference adjustment amount corresponding to a target voltage transformation circuit is as follows:

[0024] Acquiring a battery voltage of the battery pack and an initial bus voltage corresponding to a target voltage transformation circuit;

[0025] Determining a reference adjustment amount corresponding to a target voltage transformation circuit based on a voltage difference between the battery voltage and the initial bus voltage;

[0026] The initial bus voltage is the bus voltage corresponding to when the target transformer circuit is started.

[0027] Optionally, determining a reference adjustment amount corresponding to a target voltage transformation circuit based on a voltage difference between the battery voltage and the initial bus voltage includes:

[0028] The voltage difference between the battery voltage and the initial bus voltage is recorded as a reference voltage difference, and the ratio of the reference voltage difference to the initial bus voltage is used as a reference adjustment amount corresponding to the target voltage transformation circuit.

[0029] In another aspect of the present invention, a transformer circuit control device is provided, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the above-mentioned transformer circuit control method when executing the computer program.

[0030] Another aspect of the present invention further provides a parallel UPS system, comprising:

[0031] At least two UPSs, and at least two of the above transformer circuit control devices;

[0032] Each UPS contains at least one transformer circuit, each transformer circuit is connected in parallel and then connected to the same battery pack, and the battery pack has no neutral line;

[0033] The voltage conversion circuit control device is connected to the voltage conversion circuit in a one-to-one correspondence.

[0034] The beneficial effects of the voltage conversion circuit control method and device, and the parallel UPS system provided by the present invention are:

[0035] First, the inventor of the present application discovered that when at least two transformer circuits share the same battery pack and the shared battery pack has no neutral line, it is very easy for DC circulation to occur between the transformer circuits. On this basis, the present invention proposes a transformer circuit control method and device, and a parallel UPS system, that is, the current of the transformer circuit is controlled by using the bus voltage of the transformer circuit and the positive and negative bus inductance currents of the transformer circuit. Different from the prior art solution of directly controlling one group of switches and setting another group of switches to automatically follow, the present invention controls the first controllable switch and the second controllable switch at the same time, thereby better ensuring the balance of the bus voltage and suppressing the DC circulation between the transformer circuits. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0037] Figure 1 A schematic flow chart of a voltage transformer circuit control method provided by an embodiment of the present invention;

[0038] Figure 2 A control loop diagram of a voltage transformer circuit control method provided by an embodiment of the present invention;

[0039] Figure 3 A schematic diagram of the structure of a voltage conversion circuit control device provided by an embodiment of the present invention;

[0040] Figure 4 A schematic diagram of the structure of a parallel UPS system provided by an embodiment of the present invention;

[0041] Figure 5 A schematic diagram of a scenario including a parallel transformer circuit provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention.

[0043] The present invention will be further described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0044] The voltage transformer circuit control method is applied to any voltage transformer circuit in the parallel voltage transformer circuit. The parallel voltage transformer circuit includes at least two voltage transformer circuits, each of which includes at least one first controllable switch, at least one second controllable switch, at least one positive bus inductor, at least one negative bus inductor, at least one capacitor corresponding to the positive bus inductor, and at least one capacitor corresponding to the negative bus inductor. The first controllable switch is used to control the positive bus inductor current, and the second controllable switch is used to control the negative bus inductor current. At least two voltage transformer circuits are connected in parallel to the same battery pack, and the battery pack has no neutral line. For a specific circuit structure diagram, please refer to Figure 5 , Figure 5 It is a parallel transformer circuit composed of two transformer circuits. The transformer circuit adopts a T-type three-level structure and uses LC filtering. Each phase has 4 switch tubes, 2 vertical tubes and 2 horizontal tubes. Among them, BAT+ and BAT- are the positive and negative terminals of the battery pack respectively. Among them, the battery pack has no neutral line.

[0045] Among them, the transformer circuit described in the embodiment of the present invention can be a boost circuit, a buck circuit, or a buck-boost derivative circuit. Among them, the transformer circuits described in the embodiment of the present invention can be connected in parallel with a common bus or in parallel with non-common bus. They can be connected in parallel directly or indirectly through an inverter circuit, a load, etc., which are not limited here.

[0046] In a parallel structure, if the inductor currents corresponding to the positive and negative busbars are not evenly distributed, it is very easy to cause a circulating current between two adjacent parallel transformer circuits. Based on this problem, the embodiment of the present invention proposes the following solution:

[0047] Please refer to Figure 1 and Figure 2 , Figure 1 A schematic diagram of a transformer circuit control method according to an embodiment of the present invention is provided. Figure 2 A control loop diagram of a voltage transformer circuit control method provided by an embodiment of the present invention, the voltage transformer circuit control method comprising:

[0048] S101: Acquire a real-time bus voltage Vbus_fdb corresponding to a target transformer circuit, and determine a current given value based on the real-time bus voltage Vbus_fdb and a preset bus voltage given value Vbus_ref.

[0049] In this embodiment, the current given value is determined based on the real-time bus voltage Vbus_fdb and the preset bus voltage given value Vbus_ref, which can be described in detail as follows:

[0050] The bus voltage error value is determined based on the real-time bus voltage Vbus_fdb and the preset bus voltage set value Vbus_ref, and the bus voltage error value is input into the preset voltage loop controller to obtain the current set value.

[0051] S102: Obtain the positive bus inductance current I corresponding to the target transformer circuit L+ And the negative bus inductor current I L- , and based on the current given value and the positive bus inductance current I L+ The first controllable switch of the target transformer circuit is controlled based on the current given value and the negative bus inductor current I L- The second controllable switch of the target transformer circuit is controlled to achieve current sharing of the positive and negative bus inductor currents.

[0052] In this embodiment, in order to suppress various DC loop currents between transformer circuits caused by the shared battery pack, the deviation of the positive and negative discharge currents of the battery in each transformer circuit should be as small as possible, and the positive and negative discharge currents of the battery in the loop control need to be closed-loop controlled at the same time. Therefore, this embodiment controls the first controllable switch and the second controllable switch of the target transformer circuit at the same time. Specifically, when the positive bus voltage is greater than the negative bus voltage, the first controllable switch drive is reduced (reduced charging of the positive bus capacitor) and the second controllable switch drive is increased (increased charging of the negative bus capacitor) through PI regulation to achieve bus balance. When the positive bus is smaller than the negative bus, the opposite is true.

[0053] From the above description, it can be seen that the beneficial effects of the transformer circuit control method and device and the parallel UPS system provided by the embodiments of the present invention are:

[0054] First, the inventor of the present application discovered that when at least two transformer circuits share the same battery pack and the battery pack has no neutral line, it is very easy for DC circulation to occur between the transformer circuits. On this basis, the embodiment of the present invention proposes a transformer circuit control method and device, and a parallel UPS system, that is, the current of the transformer circuit is controlled by using the bus voltage of the transformer circuit and the positive and negative bus inductance currents of the transformer circuit. Different from the solution in the prior art that directly controls one group of switches and sets another group of switches to automatically follow, the embodiment of the present invention controls the first controllable switch and the second controllable switch at the same time, thereby better ensuring the balance of the bus voltage and suppressing the DC circulation between the transformer circuits.

[0055] Optional, please refer to Figure 2 As a specific implementation of the transformer circuit control method provided in an embodiment of the present invention, based on the current given value and the positive bus inductor current I L+ Controlling a first controllable switch of a target transformer circuit includes:

[0056] Based on the current given value and the positive bus inductance current I L+ A first controllable switch adjustment amount is determined.

[0057] Obtain the unbalanced adjustment value ΔV and the reference adjustment value V corresponding to the target transformer circuit base , based on the first controllable switch adjustment value, the unbalanced adjustment value ΔV and the reference adjustment value V base The first controllable switch of the target voltage transformation circuit is controlled.

[0058] In this embodiment, 1 / 2 of the current given value is used as the first controllable switch current given value, based on the first controllable switch current given value and the positive bus inductance current I L+ The positive bus inductor current error value is determined, the positive bus inductor current error value is input into a first preset current loop controller, and the ratio of the output of the first preset current loop controller to the initial bus voltage Vbus is used as the first controllable switch adjustment amount.

[0059] In this embodiment, the unbalanced adjustment amount can eliminate the information / action delay between the first controllable switch and the second controllable switch of the transformer circuit, so that the inductor currents corresponding to the positive and negative buses are kept consistent. The reference adjustment amount can effectively improve the control speed of the embodiment of the present invention, so that the inductor currents corresponding to the positive and negative buses reach the corresponding given values ​​faster, thereby achieving current sharing faster.

[0060] Optional, please refer to Figure 2 As a specific implementation of the transformer circuit control method provided by an embodiment of the present invention, controlling the first controllable switch of the target transformer circuit based on the first controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount includes:

[0061] The first controllable switch adjustment amount and the reference adjustment amount V base The sum is used as the basic adjustment variable of the first controllable switch.

[0062] The first controllable switch of the target voltage conversion circuit is controlled based on the sum of the first controllable switch basic adjustment amount and the unbalanced adjustment amount ΔV.

[0063] In this embodiment, the sum of the first controllable switch basic adjustment amount and the unbalanced adjustment amount ΔV is used as the first controllable switch adjustment amount, and a corresponding PWM wave is generated according to the first controllable switch adjustment amount. The PWM wave is used to control the first controllable switch of the target transformer circuit.

[0064] Optional, please refer to Figure 2 As a specific implementation of the transformer circuit control method provided in an embodiment of the present invention, based on the current given value and the negative bus inductance current I L- Controlling a second controllable switch of a target transformer circuit includes:

[0065] Based on the current given value and the negative bus inductance current I L- A second controllable switch adjustment amount is determined.

[0066] Obtain the unbalanced adjustment value ΔV and the reference adjustment value V corresponding to the target transformer circuit base , based on the second controllable switch adjustment value, the unbalanced adjustment value ΔV and the reference adjustment value V base The second controllable switch of the target voltage transformation circuit is controlled.

[0067] In this embodiment, based on the current given value and the negative bus inductance current I L- Determining the adjustment amount of the second controllable switch can be described in detail as follows:

[0068] 1 / 2 of the current given value is used as the second controllable switch current given value, and according to the second controllable switch current given value and the negative bus inductance current I L- Determine the negative bus inductor current error value, input the negative bus inductor current error value into the second preset current loop controller, and use the ratio of the second preset current loop controller output to the initial bus voltage Vbus as the second controllable switch adjustment amount.

[0069] In this embodiment, the unbalanced adjustment amount can eliminate the information / action delay between the first controllable switch and the second controllable switch on the transformer circuit, so that the inductor currents corresponding to the positive and negative buses remain consistent. The reference adjustment amount can effectively improve the control speed of the embodiment of the present invention, so that the inductor currents corresponding to the positive and negative buses reach the corresponding given values ​​more quickly, thereby achieving current sharing more quickly.

[0070] Optional, please refer to Figure 2 As a specific implementation of the transformer circuit control method provided by an embodiment of the present invention, the second controllable switch of the target transformer circuit is controlled based on the second controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount, including:

[0071] The second controllable switch adjustment amount and the reference adjustment amount V base The sum is used as the basic adjustment variable of the second controllable switch.

[0072] The second controllable switch of the target voltage transformation circuit is controlled based on the difference between the second controllable switch basic adjustment amount and the unbalanced adjustment amount ΔV.

[0073] In this embodiment, the difference between the second controllable switch basic adjustment amount and the unbalanced adjustment amount ΔV is used as the second controllable switch adjustment amount, and a corresponding PWM wave is generated according to the second controllable switch adjustment amount. The PWM wave is used to control the second controllable switch of the target transformer circuit.

[0074] The first controllable switch and the second controllable switch described in various embodiments of the present invention are for vertical pipes or horizontal pipes.

[0075] Optional, please refer to Figure 2 As a specific implementation of the transformer circuit control method provided by an embodiment of the present invention, a method for determining the unbalanced adjustment amount corresponding to the target transformer circuit is:

[0076] The real-time voltage difference between the positive and negative buses (VbusP is the positive bus voltage, VbusN is the negative bus voltage) in the real-time bus voltage is calculated, and the unbalanced adjustment amount ΔV corresponding to the target transformer circuit is determined according to the real-time voltage difference.

[0077] In this embodiment, the ratio of the real-time voltage difference to the preset bus voltage reference value Vbus_ref may be used as the unbalanced adjustment amount ΔV corresponding to the target transformer circuit.

[0078] Optional, please refer to Figure 2 As a specific implementation of the voltage transformer circuit control method provided by the embodiment of the present invention, the reference adjustment amount V corresponding to the target voltage transformer circuit base The method to determine is:

[0079] The battery voltage Vbat of the battery pack and the initial bus voltage Vbus corresponding to the target voltage transformation circuit are obtained.

[0080] The reference adjustment amount V corresponding to the target voltage transformation circuit is determined based on the voltage difference between the battery voltage Vbat and the initial bus voltage Vbus. base .

[0081] The initial bus voltage Vbus is the bus voltage corresponding to when the target transformer circuit is started.

[0082] Optional, please refer to Figure 2 As a specific implementation of the voltage conversion circuit control method provided by an embodiment of the present invention, determining a reference adjustment amount corresponding to the target voltage conversion circuit based on the voltage difference between the battery voltage and the initial bus voltage includes:

[0083] The voltage difference between the battery voltage Vbat and the initial bus voltage Vbus is recorded as the reference voltage difference, and the ratio of the reference voltage difference Vbat to the initial bus voltage Vbus is used as the reference adjustment amount V corresponding to the target voltage transformation circuit. base .

[0084] Another aspect of an embodiment of the present invention provides a transformer circuit control device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the above-mentioned transformer circuit control method when executing the computer program.

[0085] Please refer to Figure 3 , Figure 3 FIG. 1 is a schematic block diagram of a voltage transformer circuit control device provided by an embodiment of the present invention. Figure 3 The transformer circuit control device 300 in the embodiment shown may include: one or more processors 301, one or more input devices 302, one or more output devices 303 and one or more memories 304. The processors 301, input devices 302, output devices 303 and memories 304 communicate with each other via a communication bus 305. The memory 304 is used to store computer programs, which include program instructions. The processor 301 is used to execute the program instructions stored in the memory 304. The processor 301 is configured to call the program instructions to execute the steps in the above-mentioned method embodiments, for example Figure 1 The functions of steps S101 to S102 are shown.

[0086] It should be understood that in the embodiment of the present invention, the processor 301 may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc.

[0087] The input device 302 may include a touch panel, a fingerprint sensor (for collecting the user's fingerprint information and fingerprint direction information), a microphone, etc., and the output device 303 may include a display (LCD, etc.), a speaker, etc.

[0088] The memory 304 may include a read-only memory and a random access memory, and provide instructions and data to the processor 301. A portion of the memory 304 may also include a non-volatile random access memory. For example, the memory 304 may also store information about the device type.

[0089] In a specific implementation, the processor 301, input device 302, and output device 303 described in the embodiment of the present invention can execute the implementation methods described in the first and second embodiments of the transformer circuit control method provided in the embodiment of the present invention, and can also execute the implementation methods of the terminal described in the embodiment of the present invention, which will not be repeated here.

[0090] Please refer to Figure 4Another aspect of the embodiment of the present invention further provides a parallel UPS system, including:

[0091] At least two UPSs 40, and at least two transformer circuit control devices 41 described above.

[0092] Each UPS 40 includes at least one transformer circuit 42 therein. The transformer circuits 42 are connected in parallel to the same battery pack, and the battery pack has no neutral line.

[0093] The voltage conversion circuit control device 41 is connected to the voltage conversion circuit 42 in a one-to-one correspondence.

[0094] In this embodiment, the transformer circuit control device 41 is used to collect the real-time bus voltage, positive bus inductance current, and negative bus inductance current of the corresponding transformer circuit 42, and control the first controllable switch and the second controllable switch of the corresponding transformer circuit 42 based on the collected real-time bus voltage, positive bus inductance current, and negative bus inductance current.

[0095] The above are only specific embodiments of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed by the present invention, and these modifications or replacements should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention shall be based on the protection scope of the claims.

Claims

1. A transformer circuit control method, characterized in that: The transformer circuit control method is applied to any transformer circuit in a parallel transformer circuit, the parallel transformer circuit includes at least two transformer circuits, each transformer circuit includes at least one first controllable switch, at least one second controllable switch, at least one positive bus inductor, at least one negative bus inductor, at least one capacitor corresponding to the positive bus inductor, at least one capacitor corresponding to the negative bus inductor, the first controllable switch is used to regulate the positive bus inductor current, the second controllable switch is used to regulate the negative bus inductor current, and the transformer circuits are connected in parallel to the same battery pack, and the battery pack has no neutral line; The voltage conversion circuit control method comprises: Acquire a real-time bus voltage corresponding to the target transformer circuit, and determine a current given value based on the real-time bus voltage and a preset bus voltage given value; Acquire a positive bus inductor current and a negative bus inductor current corresponding to a target transformer circuit, and control a first controllable switch of the target transformer circuit based on the current given value and the positive bus inductor current, and control a second controllable switch of the target transformer circuit based on the current given value and the negative bus inductor current, so as to achieve current sharing of the positive and negative bus inductor currents; The controlling of the first controllable switch of the target transformer circuit based on the current given value and the positive bus inductance current includes: Determining a first controllable switch adjustment amount based on the current given value and the positive bus inductance current; Acquire an unbalanced adjustment amount and a reference adjustment amount corresponding to a target transformer circuit, and control a first controllable switch of the target transformer circuit based on the first controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount; The controlling the second controllable switch of the target transformer circuit based on the current given value and the negative bus inductance current includes: Determining a second controllable switch adjustment amount based on the current given value and the negative bus inductor current; Acquire an unbalanced adjustment amount and a reference adjustment amount corresponding to a target transformer circuit, and control a second controllable switch of the target transformer circuit based on the second controllable switch adjustment amount, the unbalanced adjustment amount and the reference adjustment amount; The method for determining the reference adjustment amount corresponding to the target voltage transformation circuit is as follows: Obtain the battery voltage of the battery pack and the initial bus voltage corresponding to the target transformer circuit; determine the reference adjustment amount corresponding to the target transformer circuit based on the voltage difference between the battery voltage and the initial bus voltage; wherein the initial bus voltage is the bus voltage corresponding to when the target transformer circuit is started.

2. The voltage conversion circuit control method according to claim 1, characterized in that: The controlling the first controllable switch of the target transformer circuit based on the first controllable switch adjustment amount, the unbalance adjustment amount and the reference adjustment amount includes: The sum of the first controllable switch adjustment amount and the reference adjustment amount is used as the first controllable switch basic adjustment amount; The first controllable switch of the target transformer circuit is controlled based on the sum of the first controllable switch basic adjustment amount and the unbalanced adjustment amount.

3. The voltage conversion circuit control method according to claim 1, characterized in that: The controlling the second controllable switch of the target transformer circuit based on the second controllable switch adjustment amount, the unbalance adjustment amount and the reference adjustment amount includes: The sum of the second controllable switch adjustment amount and the reference adjustment amount is used as the second controllable switch basic adjustment amount; The second controllable switch of the target transformer circuit is controlled based on the difference between the second controllable switch basic adjustment amount and the unbalanced adjustment amount.

4. The transformer circuit control method according to any one of claims 1 to 3, characterized in that: The method for determining the unbalanced adjustment amount corresponding to the target transformer circuit is: The real-time voltage difference between the positive and negative buses in the real-time bus voltage is calculated, and the unbalanced adjustment amount corresponding to the target transformer circuit is determined according to the real-time voltage difference.

5. The voltage conversion circuit control method according to claim 1, characterized in that: The determining of a reference adjustment amount corresponding to a target voltage transformation circuit based on a voltage difference between the battery voltage and the initial bus voltage includes: The voltage difference between the battery voltage and the initial bus voltage is recorded as a reference voltage difference, and the ratio of the reference voltage difference to the initial bus voltage is used as a reference adjustment amount corresponding to the target voltage transformation circuit.

6. A transformer circuit control device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method according to any one of claims 1 to 5 are implemented.

7. A parallel UPS system, characterized in that: include: At least two UPS and at least two transformer circuit control devices according to claim 6; Each UPS contains at least one transformer circuit, each transformer circuit is connected in parallel and then connected to the same battery pack, and the battery pack has no neutral line; The voltage conversion circuit control device is connected to the voltage conversion circuit in a one-to-one correspondence.

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