Phase-shifted control method and device for transformer

Abstract

The application relates to a transformer phase-shifting control method and device, computer equipment, a storage medium and a computer program product. The method comprises the following steps: in a first modulation period of the transformer, a first number of sub-modules in a first bridge arm and a fourth bridge arm of the transformer are respectively put into operation, and a second number of sub-modules in a second bridge arm and a third bridge arm are respectively put into operation; in a second modulation period of the transformer, the second number of sub-modules in the first bridge arm and the fourth bridge arm are respectively put into operation, and the first number of sub-modules in the second bridge arm and the third bridge arm are respectively put into operation. The method can improve the operation efficiency, current and voltage performance of the transformer.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of power transmission, in particular to a transformer phase-shift control method and device. BACKGROUND

[0002] With the proposal of the double carbon target in China, the policy of clean power supply in the power grid is gradually tightened. Due to the friendliness to high penetration rate of renewable energy access, the direct current power grid will have a good prospect in the development of future power grid. In the direct current power grid, the direct current transformer is a key converter equipment for completing power transmission and voltage conversion. In order to realize the interconnection of different voltage level direct current systems at the high voltage direct current transmission level, the modular multilevel converter (MMC) type direct current transformer has gradually become the focus in the field of high voltage direct current interconnection due to its modular structure, easy expansion and redundancy of sub-modules. In the modular multilevel converter type direct current transformer, phase-shift control strategies based on square wave, square wave, sine wave and triangular wave are adopted.

[0003] However, in the current phase-shift control strategy, the power loss of the direct current transformer is large, and the operating performance is reduced. SUMMARY

[0004] Therefore, it is necessary to provide a transformer phase-shift control method, device, computer equipment, computer readable storage medium and computer program product to solve the above technical problems.

[0005] In a first aspect, the present application provides a transformer phase-shift control method. The method comprises:

[0006] In the first modulation period of the transformer, a first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer are respectively put into operation, and a second number of sub-modules in the second bridge arm and the third bridge arm are respectively put into operation;

[0007] In the second modulation period of the transformer, the second number of sub-modules in the first bridge arm and the fourth bridge arm are respectively put into operation, and the first number of sub-modules in the second bridge arm and the third bridge arm are respectively put into operation;

[0008] The first modulation period and the second modulation period belong to the same switching period; the first number and the second number are determined based on the working parameters of the transformer.

[0009] In one of the embodiments, the working parameters include direct current parameters and capacitor voltage data.

[0010] The step of putting the first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer and putting the second number of sub-modules in the second bridge arm and the third bridge arm of the transformer respectively in the first modulation period of the transformer comprises the following steps:

[0011] The DC electrical parameter of the transformer DC side is obtained, and the capacitor voltage data of each sub-module of the transformer is obtained; the DC electrical parameter comprises a first DC voltage and a second DC voltage;

[0012] The first number and the second number are determined respectively according to the DC electrical parameter and the capacitor voltage data.

[0013] In one embodiment, the step of determining the first number and the second number respectively according to the DC electrical parameter and the capacitor voltage data comprises the following steps:

[0014] The AC electrical parameter of the transformer AC side in the first modulation period is obtained; the AC electrical parameter comprises a first AC voltage and a second AC voltage;

[0015] The first AC voltage and the second AC voltage are processed based on the DC electrical parameter and the capacitor voltage data to obtain the first number.

[0016] In one embodiment, the step of determining the first number and the second number respectively according to the DC electrical parameter and the capacitor voltage data comprises the following steps:

[0017] The AC electrical parameter of the transformer AC side in the second modulation period is obtained; the AC electrical parameter comprises a third AC voltage;

[0018] The first AC voltage and the third AC voltage are processed to obtain the second number.

[0019] In one embodiment, the second modulation period is a period that lags behind the first modulation period in the switching period.

[0020] In one embodiment, the proportion of the first modulation period and the second modulation period in the switching period is 0.5.

[0021] In a second aspect, the application further provides a transformer phase shift control device. The device comprises:

[0022] A first switching module is configured to put a first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer and put a second number of sub-modules in the second bridge arm and the third bridge arm of the transformer respectively in the first modulation period of the transformer.

[0023] a second switching module, configured to switch in the second number of sub-modules in the first bridge arm and the fourth bridge arm, and switch in the first number of sub-modules in the second bridge arm and the third bridge arm, respectively, in a second modulation period of the transformer; the first modulation period and the second modulation period belong to a same switching period; the first number and the second number are determined based on an operating parameter of the transformer.

[0024] In a third aspect, the present application provides a computer device. The computer device comprises a memory and a processor. The memory stores a computer program. The processor implements the following steps when executing the computer program:

[0025] switching in the first number of sub-modules in the first bridge arm and the fourth bridge arm, and switching in the second number of sub-modules in the second bridge arm and the third bridge arm, respectively, in a first modulation period of the transformer;

[0026] switching in the second number of sub-modules in the first bridge arm and the fourth bridge arm, and switching in the first number of sub-modules in the second bridge arm and the third bridge arm, respectively, in a second modulation period of the transformer;

[0027] the first modulation period and the second modulation period belong to a same switching period; the first number and the second number are determined based on an operating parameter of the transformer.

[0028] In a fourth aspect, the present application provides a computer readable storage medium. The computer readable storage medium stores a computer program. The computer program is executed by a processor to implement the following steps:

[0029] switching in the first number of sub-modules in the first bridge arm and the fourth bridge arm, and switching in the second number of sub-modules in the second bridge arm and the third bridge arm, respectively, in a first modulation period of the transformer;

[0030] switching in the second number of sub-modules in the first bridge arm and the fourth bridge arm, and switching in the first number of sub-modules in the second bridge arm and the third bridge arm, respectively, in a second modulation period of the transformer;

[0031] the first modulation period and the second modulation period belong to a same switching period; the first number and the second number are determined based on an operating parameter of the transformer.

[0032] In a fifth aspect, the present application provides a computer program product. The computer program product comprises a computer program. The computer program is executed by a processor to implement the following steps:

[0033] in the first modulation period of the transformer, respectively, a first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer are put into operation, and respectively, a second number of sub-modules in the second bridge arm and the third bridge arm are put into operation;

[0034] in the second modulation period of the transformer, respectively, the second number of sub-modules in the first bridge arm and the fourth bridge arm are put into operation, and respectively, the first number of sub-modules in the second bridge arm and the third bridge arm are put into operation;

[0035] the first modulation period and the second modulation period belong to the same switching period; the first number and the second number are determined based on the working parameters of the transformer.

[0036] The transformer phase-shift control method, device, computer equipment, storage medium and computer program product, by controlling the first bridge arm and the fourth bridge arm of the transformer to put into the first number of sub-modules in the first modulation period of the transformer, and controlling the second bridge arm and the third bridge arm to put into the second number of sub-modules; while in the second modulation period, the first bridge arm and the fourth bridge arm of the transformer are controlled to put into the second number of sub-modules, and the second bridge arm and the third bridge arm are controlled to put into the first number of sub-modules; the number of sub-modules that should be put into each bridge arm of the transformer is controlled, and the supporting pressure of part of the sub-module capacitor voltage is effectively utilized to offset part of the direct current voltage, which ensures the matching of the alternating current link voltage of the transformer in a wide direct current voltage range, and improves the operation efficiency, current and voltage performance of the transformer. BRIEF DESCRIPTION OF DRAWINGS

[0037] Figure 1 Fig. 1 is a schematic diagram of the topology structure of a modular multilevel converter type direct current transformer;

[0038] Figure 2 Fig. 2 is a schematic diagram of the structure of a half-bridge sub-module HB;

[0039] Figure 3 Fig. 3 is a schematic diagram of the operation waveform of a conventional phase-shift control strategy of a modular multilevel converter type direct current transformer;

[0040] Figure 4 Fig. 4 is a schematic diagram of the flow of a transformer phase-shift control method in an embodiment;

[0041] Figure 5 Fig. 5 is a schematic diagram of the operation waveform of a transformer phase-shift control method in an embodiment;

[0042] Figure 6 Fig. 6 is a schematic diagram of the structure of a transformer phase-shift control device in an embodiment. DETAILED DESCRIPTION

[0043] For the purposes of the present application, a more complete description of which will follow, reference will be made to the accompanying drawings referenced below. The drawings illustrate embodiments of the application. The application may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and fully convey the scope of the application to those skilled in the art.

[0044] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0045] Figure 1 The topology structure of a modular multilevel converter type direct current transformer (hereinafter referred to as a modular multilevel direct current transformer) is shown, wherein the direct current side V1 side and the direct current side V2 side structure of the modular multilevel direct current transformer are the same, wherein the V1 side includes bridge arm 1, bridge arm 2, bridge arm 3, bridge arm 4 and bridge arm reactor L arm , wherein bridge arm 1 and bridge arm 3 are both upper bridge arms, bridge arm 2 and bridge arm 4 are both lower bridge arms, and each bridge arm includes N half-bridge sub-modules HB, wherein a structural schematic diagram of the half-bridge sub-module HB is shown as Figure 2 ; V1 represents the direct current voltage of the V1 side, V2 represents the direct current voltage of the V2 side, v1 represents the alternating current voltage of the alternating current side v1 side, v2 represents the alternating current voltage of the alternating current side v2 side, k T is the transformation ratio coefficient of the alternating current transformer in the modular multilevel direct current transformer.

[0046] In the modular multilevel direct current transformer, the phase-shifted control strategy based on square wave is usually adopted, although the phase-shifted control strategy based on square wave is simple and has large transmission capacity, but this control strategy will bring a large alternating current link dv / dt, therefore, some researches propose phase-shifted control based on square wave, sine wave and triangular wave, on the basis of sacrificing control complexity, the reduction of alternating current link dv / dt is realized.

[0047] Taking the bridge arm voltage operating waveform of the V1 side as an example, Figure 3 The operating waveform diagram of the conventional phase-shifted control strategy of the modular multilevel direct current transformer is shown, wherein T hs is half of the switching period of the modular multilevel direct current transformer; it can be known from Figure 3 that in the first half of the switching period, the output voltages of bridge arm 1 and bridge arm 4 are both NV c , and the output voltages of bridge arm 2 and bridge arm 3 are both 0, in the first half of the switching period, the alternating current voltage of the v1 side is (-V1), and the alternating current voltage of the v2 side is (-k TV2); in the latter half of the switching cycle, the output voltage of the bridge arm 1 and the bridge arm 4 are both 0, and the output voltage of the bridge arm 2 and the bridge arm 3 are both NV c In the latter half of the switching cycle, the alternating voltage on the v1 side is V1, and the alternating voltage on the v2 side is k T V2; in the conventional phase-shifted control, no matter what kind of modulation wave is used, the voltage value on each bridge arm changes in the range of [0, NV c ], where N is the total number of sub-modules of each bridge arm in the modular multi-level DC transformer, V c is the capacitor voltage value of each sub-module in the steady state, and different modulation methods only bring different voltage change processes without affecting the change range;

[0048] However, in the above phase-shifted control strategy, the voltage amplitude of the DC transformer AC side is equal to the DC side voltage, and the voltage amplitude of the AC side cannot be actively controlled, so that when the DC voltage at both ends of the modular DC transformer does not match, a large reactive circulating current occurs, which increases the AC circulating current, the circulating current, the power loss of the converter, and reduces the operating performance of the DC transformer.

[0049] The transformer phase-shifted control method provided in the present application uses the voltage support of part of the sub-module capacitors to offset part of the DC voltage, which can enable the modular multi-level DC transformer to realize AC voltage amplitude matching in a wide DC voltage range, improve the operating performance of the modular multi-level DC transformer, and broaden the application scenarios of the modular multi-level DC transformer.

[0050] In order to make the purpose, technical scheme and advantages of the present application clearer and more apparent, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.

[0051] In one embodiment, as Figure 4 shown, a transformer phase-shifted control method is provided, which is applied to a modular multi-level DC transformer in Figure 1 for example, can include the following steps:

[0052] Step S410, in the first modulation cycle of the transformer, respectively put in the first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer, and respectively put in the second number of sub-modules in the second bridge arm and the third bridge arm;

[0053] Step S420, in the second modulation period of the transformer, respectively put in the second number of sub-modules in the first bridge arm and the fourth bridge arm, and respectively put in the first number of sub-modules in the second bridge arm and the third bridge arm; wherein, the first modulation period and the second modulation period belong to the same switching period; the first number and the second number are determined based on the working parameters of the transformer.

[0054] Specifically, taking the modular multilevel DC transformer in the transformer as an example, wherein the first bridge arm is bridge arm 1, the second bridge arm is bridge arm 2, the third bridge arm is bridge arm 3, and the fourth bridge arm is bridge arm 4. Figure 1

[0055] In the first modulation period of the modular multilevel DC transformer, respectively put in the first number of sub-modules in the bridge arm 1 and the bridge arm 4, and respectively put in the second number of sub-modules in the bridge arm 2 and the bridge arm 3; and in the second modulation period of the modular multilevel DC transformer, respectively put in the second number of sub-modules in the bridge arm 1 and the bridge arm 4, and respectively put in the first number of sub-modules in the bridge arm 2 and the bridge arm 3.

[0056] Wherein, the first modulation period and the second modulation period belong to the same switching period of the modular multilevel DC transformer; the first number and the second number can be determined based on the working parameters of the modular multilevel DC transformer.

[0057] In one embodiment, the second modulation period is the period that lags behind the first modulation period in the switching period.

[0058] Specifically, in the same switching period of the transformer, the second modulation period is entered only after the end of the first modulation period.

[0059] In one embodiment, the proportion of the first modulation period and the second modulation period in the switching period is 0.5.

[0060] Specifically, in the same switching period of the transformer, the proportion of the first modulation period and the second modulation period is 0.5, that is, the first modulation period is the first half of the switching period, and the second modulation period is the second half of the switching period.

[0061] The above transformer phase shift control method effectively utilizes the capacitor voltage of the sub-modules in the bridge arm by controlling the number of sub-modules put in each bridge arm in different modulation periods of the modular multilevel DC transformer, thereby ensuring the matching of the voltage amplitude on both sides of the AC transformer and realizing the improvement of the operating efficiency, current and voltage performance of the modular multilevel DC transformer.

[0062] In one embodiment, the working parameters include DC parameters and capacitor voltage data.

[0063] ​Before the steps of engaging a first number of sub-modules in the first and fourth arms of the transformer, and engaging a second number of sub-modules in the second and third arms, respectively, during the first modulation cycle of the transformer, the following may be included:

[0064] Obtain the DC electrical parameters of the transformer's DC side, and obtain the capacitor voltage data of each sub-module of the transformer; the DC electrical parameters include the first DC voltage and the second DC voltage;

[0065] Based on the DC electrical parameters and capacitor voltage data, determine the first quantity and the second quantity respectively.

[0066] Specifically, taking transformers as Figure 1 Taking a modular multilevel DC transformer as an example, the DC parameters of the DC side of the modular multilevel DC transformer are obtained. Further, the DC parameters may include a first DC voltage and a second DC voltage, wherein the first DC voltage is the DC voltage on the V1 side (i.e., V1 is the first DC voltage), and the second DC voltage is the DC voltage on the V2 side (i.e., V2 is the second DC voltage); and the capacitor voltage data of each sub-module of the modular multilevel DC transformer are obtained, i.e., the capacitor voltage value V of each sub-module in steady state is obtained. c Therefore, based on the acquired DC electrical parameters and capacitor voltage data, the first quantity and the second quantity can be determined respectively.

[0067] In one embodiment, the step of determining the first quantity and the second quantity based on the DC current parameters and capacitor voltage data may include:

[0068] The AC electrical parameters of the transformer AC side during the first modulation period are obtained; the AC electrical parameters include the first AC voltage and the second AC voltage.

[0069] Based on DC electrical parameters and capacitor voltage data, the first AC voltage and the second AC voltage are processed to obtain the first quantity.

[0070] Specifically, taking transformers as Figure 1 Taking a modular multilevel DC transformer as an example, the AC parameters of the AC side of the modular multilevel DC transformer in the first modulation period are obtained. Further, the AC parameters may include a first AC voltage and a second AC voltage, wherein the first AC voltage is the voltage data obtained by the v1 side in the first modulation period, and the second AC voltage is the voltage data obtained by the v2 side in the first modulation period.

[0071] Based on the DC electrical parameters and capacitor voltage data obtained above, the first AC voltage and the second AC voltage are processed to obtain the first quantity.

[0072] In one embodiment, it further includes:

[0073] obtaining an AC electrical parameter of an AC side of the transformer in a second modulation period; the AC electrical parameter comprises a third AC voltage;

[0074] processing the first AC voltage and the third AC voltage to obtain a second quantity.

[0075] Specifically, taking the modular multilevel DC transformer in the Figure 1 obtaining an AC electrical parameter of an AC side of the modular multilevel DC transformer in a second modulation period, and further, the AC electrical parameter can comprise a third AC voltage, which is voltage data obtained by the V1 side in the second modulation period;

[0076] Based on the first quantity obtained above, and processing the obtained first AC voltage and the third AC voltage, a second quantity can be obtained.

[0077] In order to better illustrate the technical solutions of the present application, a specific example will be described below:

[0078] In the phase-shifted control of the modular multilevel DC transformer, the voltage of each bridge arm satisfies the following formula (1):

[0079]

[0080] As can be seen from formula (1), the number of sub-modules put into the upper and lower bridge arms is always kept as N, and the number of sub-modules put into the bridge arm 1 is the same as that put into the bridge arm 4, and the number of sub-modules put into the bridge arm 2 is the same as that put into the bridge arm 3, so the capacitor voltage value V c of each sub-module at steady state is calculated by the following formula (2):

[0081]

[0082] Taking the bridge arm voltage running waveform of the V1 side as an example, the running waveform of the improved phase-shifted control method provided by the present application is shown in Figure 5 , wherein, taking the first quantity as N2 and the second quantity as N1 as an example, it can be seen that the difference between the improved phase-shifted control strategy of the present application and the conventional phase-shifted control strategy shown in Figure 3 lies in the switching mode of the sub-modules in the bridge arm; as can be seen from Figure 5 , in the first half of the switching period, the output voltage of the bridge arm 1 and the bridge arm 4 is both N2V c , and the output voltage of the bridge arm 2 and the bridge arm 3 is both (N-N2)V c ; in the second half of the switching period, the output voltage of the bridge arm 1 and the bridge arm 4 is both N1V c , and the output voltage of the bridge arm 2 and the bridge arm 3 is both (N-N1)V c ;

[0083] Further, a first alternating voltage (V1-2N2V c ) of the AC side v1 of the modular multilevel DC transformer in the first half of the switching period (the first modulation period) is obtained, and a second alternating voltage (-k T V2) of the AC side v2 of the modular multilevel DC transformer in the first half of the switching period is obtained. The improved phase-shifted control method provided in the present application can ensure the matching of the voltage amplitudes of the two sides of the AC transformer, i.e., the first alternating voltage (V1-2N2V c ) and the second alternating voltage (-k T V2) satisfy the following formula (3):

[0084] V1-2N2V c =-k T V2 (3)

[0085] In combination with formula (2), the first number N2 can be calculated by the following formula (4):

[0086]

[0087] wherein, round[] is a rounding function.

[0088] Further, a third alternating voltage (V1-2N1V c ) of the AC side v1 of the modular multilevel DC transformer in the second half of the switching period (the second modulation period) is obtained, and due to the symmetry of the AC side voltage, i.e., the first alternating voltage (V1-2N2V c ) and the third alternating voltage (V1-2N1V c ) satisfy the following formula (5):

[0089] V1-2N2V c =-(V1-2N1V c )

[0090] The second number N1 obtained from formula (5) can be calculated by the following formula (6):

[0091] N1=N-N2 (6)

[0092] In one embodiment, the steps of determining the first number and the second number according to the DC parameter and the capacitor voltage data can also include:

[0093] obtaining an AC parameter of the transformer AC side in the second modulation period; the AC parameter includes a fourth alternating voltage;

[0094] processing the third alternating voltage and the fourth alternating voltage based on the DC parameter and the capacitor voltage data to obtain the second number.

[0095] Specifically, also taking the modular multilevel DC transformer in the transformer as an example, a fourth alternating voltage of the AC side of the modular multilevel DC transformer in a second modulation period is obtained, and further, the fourth alternating voltage is voltage data obtained by the V2 side in the second modulation period.

[0096] In the specific examples provided above, the fourth alternating voltage k T V2 of the V2 side of the AC side of the modular multilevel DC transformer in the latter half of the switching period can be obtained. c Due to the improved phase-shift control method provided in the present application, the matching of the voltage amplitudes on both sides of the AC transformer can be ensured, that is, the third alternating voltage (V1-2N1V T ) and the fourth alternating voltage k c V2 satisfy the following formula (7):

[0097] V1-2N1V T =k V2 (7)

[0098] Combined with formula (2), the second number N1 can be calculated by the following formula (8):

[0099]

[0100] Where round[] is a rounding function.

[0101] Further, according to the relationship between the first number N2 and the second number N1 in formula (6), the first number N2 can be calculated by the following formula (9):

[0102] N2=N-N1 (9)

[0103] The above transformer phase-shift control method, by dynamically switching control of the sub-modules in the modular multilevel DC transformer, effectively utilizes the capacitor voltage of the sub-modules in the bridge arm, and utilizes the DC voltage information on both ends of the DC transformer, ensures the matching of the AC link voltage of the modular multilevel DC transformer in a wide DC voltage range, realizes the improvement of the operating efficiency and the current and voltage performance of the modular multilevel DC transformer, and at the same time, can reduce the power loss of the DC transformer, and the implementation method is simple and efficient, without adding hardware devices.

[0104] It should be understood that although the steps in the flowcharts involved in the embodiments described above are shown in sequence according to the arrows, the steps are not necessarily executed in the order indicated by the arrows. Unless otherwise specified herein, the execution of the steps is not strictly limited in sequence, and the steps can be executed in other orders. Moreover, at least some of the steps in the flowcharts involved in the embodiments described above can include multiple steps or multiple stages, which are not necessarily executed at the same time, but can be executed at different times, and the execution order of the steps or stages is not necessarily sequential, but can be alternately or alternately executed with at least part of other steps or steps or stages in other steps.

[0105] Based on the same inventive concept, the embodiments of the present application also provide a transformer phase shift control device for implementing the above-mentioned transformer phase shift control method. The implementation scheme for solving the problem provided by the device is similar to the implementation scheme described in the above method, so the specific limitations in one embodiment of the transformer phase shift control device provided below can refer to the limitations of the transformer phase shift control method described above, and will not be repeated here.

[0106] In one embodiment, as shown in Figure 6 A transformer phase shift control device is provided, comprising: a first switching module 610 and a second switching module 620, wherein:

[0107] The first switching module 610 is configured to switch in a first number of sub-modules in the first bridge arm and the fourth bridge arm and switch in a second number of sub-modules in the second bridge arm and the third bridge arm in a first modulation period of the transformer, respectively;

[0108] The second switching module 620 is configured to switch in the second number of sub-modules in the first bridge arm and the fourth bridge arm and switch in the first number of sub-modules in the second bridge arm and the third bridge arm in a second modulation period of the transformer, respectively; the first modulation period and the second modulation period belong to the same switching period; the first number and the second number are determined based on the operating parameters of the transformer.

[0109] In one embodiment, the operating parameters include DC parameters and capacitor voltage data;

[0110] Further comprising:

[0111] The data acquisition module is configured to acquire DC parameters on the DC side of the transformer and acquire capacitor voltage data of each sub-module of the transformer; the DC parameters include a first DC voltage and a second DC voltage;

[0112] The processing module is configured to determine the first quantity and the second quantity based on the DC parameter and the capacitor voltage data, respectively.

[0113] In one of the embodiments, the processing module is further configured to:

[0114] The AC parameter of the transformer AC side in the first modulation period is obtained; the AC parameter includes a first AC voltage and a second AC voltage.

[0115] The first AC voltage and the second AC voltage are processed based on the DC parameter and the capacitor voltage data to obtain the first quantity.

[0116] In one of the embodiments, the processing module is further configured to:

[0117] The AC parameter of the transformer AC side in the second modulation period is obtained; the AC parameter includes a third AC voltage.

[0118] The first AC voltage and the third AC voltage are processed to obtain the second quantity.

[0119] The above-mentioned modules in the transformer phase-shifting control device can be realized by software, hardware, or a combination thereof. The above-mentioned modules can be embedded in or independent of the processor in the computer device in hardware form, or can be stored in the memory in the computer device in software form, so as to be called and executed by the processor to perform the operations corresponding to the above-mentioned modules.

[0120] In one embodiment, a computer device is provided, which can be a terminal. The computer device includes a processor, a memory, a communication interface, a display screen, and an input device connected through a system bus. The processor of the computer device is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system and a computer program. The internal memory provides an environment for the operating system and the computer program in the non-volatile storage medium to run. The communication interface of the computer device is configured to perform wired or wireless communication with an external terminal. The wireless communication can be achieved through WIFI, mobile cellular network, NFC (Near Field Communication), or other technologies. The computer program is executed by the processor to implement a transformer phase-shifting control method. The display screen of the computer device can be a liquid crystal display screen or an electronic ink display screen. The input device of the computer device can be a touch layer overlaid on the display screen, or a key, trackball, or touchpad arranged on the shell of the computer device. In addition, an external keyboard, touchpad, or mouse can also be used.

[0121] In one embodiment, a computer device is also provided, including a memory and a processor, the memory storing a computer program, and the processor implementing the steps in the above method embodiments when executing the computer program.

[0122] In one embodiment, a computer readable storage medium is provided, storing a computer program, the computer program being executed by a processor to implement the steps in the above method embodiments.

[0123] In one embodiment, a computer program product is provided, including a computer program, the computer program being executed by a processor to implement the steps in the above method embodiments.

[0124] A person of ordinary skill in the art can understand that all or part of the processes in the above method embodiments can be completed by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer readable storage medium and can include the processes of the above method embodiments when executed. Any reference to a memory, database or other medium in the embodiments provided by the present application can include at least one of a non-volatile and volatile memory. The non-volatile memory can include a read-only memory (ROM), a magnetic tape, a floppy disk, a flash memory, an optical storage, a high-density embedded non-volatile memory, a resistive memory (ReRAM), a magnetoresistive random access memory (MRAM), a ferroelectric memory (FRAM), a phase change memory (PCM), a graphene memory, etc. The volatile memory can include a random access memory (RAM) or an external cache memory, etc. As an illustration but not limitation, the RAM can be in various forms, such as a static random access memory (SRAM) or a dynamic random access memory (DRAM), etc. The database involved in the embodiments provided by the present application can include at least one of a relational database and a non-relational database. The non-relational database can include a distributed database based on a block chain, etc., without being limited thereto. The processor involved in the embodiments provided by the present application can be a general processor, a central processing unit, a graphics processing unit, a digital signal processor, a programmable logic device, a data processing logic device based on quantum computing, etc., without being limited thereto.

[0125] Any technical features in the above embodiments can be combined, and for the sake of brevity, not all possible combinations are described above, however, as long as the combinations of technical features do not have contradictions, they shall be considered within the scope of the present disclosure.

[0126] The above embodiments only express several implementation manners of the present application, and the description is relatively specific and detailed, but it shall not be understood as a limitation on the patent scope of the present application. It shall be pointed out that, for ordinary skilled persons in the art, several modifications and improvements can be made without departing from the concept of the present application, and these shall be within the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the appended claims.

Claims

1. A phase-shift control method of a transformer, characterized by, The method comprises: In the first modulation period of the transformer, a first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer are respectively put into operation, and a second number of sub-modules in the second bridge arm and the third bridge arm are respectively put into operation; In the second modulation period of the transformer, the second number of sub-modules in the first bridge arm and the fourth bridge arm are respectively put into operation, and the first number of sub-modules in the second bridge arm and the third bridge arm are respectively put into operation; The first modulation period and the second modulation period belong to the same switching period, the second modulation period is the period that lags behind the first modulation period in the switching period, the proportion of the first modulation period and the second modulation period in the switching period is 0.5, and the first number and the second number are determined based on the working parameters of the transformer; The working parameters include direct current parameters and capacitor voltage data; Before the step of putting the first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer into operation and putting the second number of sub-modules in the second bridge arm and the third bridge arm into operation in the first modulation period of the transformer, the method comprises: Obtaining the direct current parameters on the direct current side of the transformer and obtaining the capacitor voltage data of each sub-module of the transformer; the direct current parameters include a first direct current and a second direct current; According to the direct current parameters and the capacitor voltage data, the first number and the second number are respectively determined.

2. The method of claim 1, wherein, The step of determining the first number and the second number according to the direct current parameters and the capacitor voltage data comprises: Obtaining the alternating current parameters of the transformer on the alternating current side in the first modulation period; the alternating current parameters include a first alternating current and a second alternating current; Based on the direct current parameters and the capacitor voltage data, the first alternating current and the second alternating current are processed to obtain the first number.

3. The method of claim 2, wherein, Further comprising: Obtaining the alternating current parameters of the transformer on the alternating current side in the second modulation period; the alternating current parameters include a third alternating current; Processing the first alternating current and the third alternating current to obtain the second number.

4. A phase-shift control device for a transformer, characterized by comprising: The device comprises: A first switching module is configured to put a first number of sub-modules in the first bridge arm and the fourth bridge arm of the transformer into operation and put a second number of sub-modules in the second bridge arm and the third bridge arm into operation in the first modulation period of the transformer; A second switching module is configured to put the second number of sub-modules in the first bridge arm and the fourth bridge arm into operation and put the first number of sub-modules in the second bridge arm and the third bridge arm into operation in the second modulation period of the transformer; the first modulation period and the second modulation period belong to the same switching period, the second modulation period is the period that lags behind the first modulation period in the switching period, the proportion of the first modulation period and the second modulation period in the switching period is 0.5, and the first number and the second number are determined based on the working parameters of the transformer; The working parameters include direct current parameters and capacitor voltage data. The device further comprises: a data acquisition module, configured to acquire the direct current parameters of the direct current side of the transformer and acquire the capacitor voltage data of each sub-module of the transformer; the direct current parameters include a first direct current voltage and a second direct current voltage; a processing module, configured to determine the first number and the second number respectively according to the direct current parameters and the capacitor voltage data. 5.A computer device, comprising a memory and a processor, wherein the memory stores a computer program, and the computer device is configured to perform the method according to any one of claims 1-4 when the computer program is executed by the processor. The processor executes the computer program to implement the steps of the method in any one of claims 1 to 3.

6. A computer-readable storage medium having stored thereon a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 3.

7. A computer program product comprising a computer program, characterized in that, The computer program is executed by the processor to implement the steps of the method in any one of claims 1 to 3.

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