CN110868064B - DC transformer, anti-droop control method, device, computer and storage medium - Google Patents

DC transformer, anti-droop control method, device, computer and storage medium Download PDF

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CN110868064B
CN110868064B CN201910998905.5A CN201910998905A CN110868064B CN 110868064 B CN110868064 B CN 110868064B CN 201910998905 A CN201910998905 A CN 201910998905A CN 110868064 B CN110868064 B CN 110868064B
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direct current
transformer
converter module
output voltage
voltage
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CN110868064A (en
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赵宇明
王静
刘国伟
艾精文
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Shenzhen Power Supply Bureau Co Ltd
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    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of dc power input into dc power output

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Abstract

The application relates to a direct current transformer, an anti-droop control method, an anti-droop control device, a computer and a storage medium, wherein the direct current transformer comprises at least two direct current-direct current converter modules, and the method comprises the following steps: acquiring input voltage of each converter module and output voltage of a direct current transformer; calculating the reference output voltage of each converter module according to the input voltage and the inverse droop coefficient of each converter module; calculating the phase shift amount of each converter module according to the output voltage of the direct-current transformer and the reference output voltage of each converter module; the output voltage of each converter module is controlled based on the phase shift amount. According to the method, the quantitative relation between the phase shift amount of the converter and the input voltage balance is obtained through calculation, and the decoupling control of the input voltage and the output voltage of the direct current transformer is realized by introducing the input voltage feedforward, so that the current balance of the input series output parallel direct current transformer can be realized, and the direct current transformer has better voltage stabilization performance.

Description

DC transformer, anti-droop control method, device, computer and storage medium
Technical Field
The present invention relates to the field of dc transformers, and in particular, to a dc transformer, an anti-droop control method, an anti-droop control device, a computer, and a storage medium.
Background
In an electric power system, a plurality of direct current-direct current converters are often connected in series at a high-voltage side to improve the voltage withstanding level, and connected in parallel at a low-voltage side to increase the current withstanding level to form a direct current transformer so as to improve the system capacity and realize the voltage matching and the electric energy transmission between high-voltage and low-voltage direct current power grids. Generally, a current-sharing control loop can be added to complete current balancing control, and the anti-droop control method is widely applied due to the fact that the anti-droop control method is simple in structure, easy to implement and high in reliability and modularization degree.
According to the traditional transformer anti-droop control method, the larger the anti-droop number of the controller is, the better the output current sharing characteristic is, but the poorer the output voltage regulation rate is, so that the traditional transformer anti-droop control method cannot give consideration to voltage stabilization and current sharing.
Disclosure of Invention
Therefore, it is necessary to provide a method and an apparatus for controlling an inverse droop of a dc transformer, a computer device, and a computer readable storage medium, which can balance the current of the dc transformer and make the dc transformer have a better voltage stabilization performance, in order to solve the technical problem that the conventional method for controlling an inverse droop of a transformer cannot achieve both current equalization and voltage stabilization.
A method of anti-droop control of a dc transformer, the dc transformer including at least two dc-to-dc converter modules, the method comprising:
acquiring input voltage of each DC-DC converter module and output voltage of the DC transformer;
calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module;
calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module;
and controlling the output voltage of each DC-DC converter module based on the phase shift amount.
According to the anti-droop control method of the direct current transformer, the quantitative relation between the phase shift amount of the converter and the input voltage balance is obtained through calculation, and the decoupling control of the input voltage and the output voltage of the direct current transformer is realized by introducing the input voltage feedforward, so that the current balance of the input series output parallel direct current transformer can be realized, and the direct current transformer has better voltage stabilization performance.
In one embodiment, the method further comprises:
and balancing the output current of each DC-DC converter module according to the phase shift amount.
In one embodiment, the method further comprises:
and controlling the phases of the inductive currents of the DC-DC converter modules to be different by 120 degrees in sequence so as to reduce the pulsation of the output voltage of the DC transformer.
In one embodiment, the dc transformer is an input series output parallel dc transformer; the DC-DC converter module is a double-active full-bridge DC-DC converter module.
An apparatus for controlling an anti-droop of a dc transformer, the dc transformer including at least two dc-dc converter modules, the apparatus comprising:
the sampling module is used for acquiring the input voltage of each DC-DC converter module and the output voltage of the DC transformer;
the reference calculation module is used for calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module;
the phase shift amount calculation module is used for calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module;
and the output control module is used for controlling the output voltage of each DC-DC converter module based on the phase shift amount.
According to the anti-droop control device of the direct current transformer, the quantitative relation between the phase shift amount of the converter and the input voltage balance is obtained through calculation, and input voltage feedforward is introduced to realize decoupling control of the input voltage and the output voltage of the direct current transformer, so that current balance of the input series output parallel direct current transformer can be realized, and the direct current transformer has good voltage stabilization performance.
In one embodiment, the output control module comprises:
and the single phase shift modulator is used for converting the phase shift amount into a driving pulse to act on the DC-DC converter modules so as to control the output voltage of each DC-DC converter module.
An anti-droop controlled DC transformer comprises at least two DC-DC converter modules and an anti-droop control device of the DC transformer;
the anti-droop control device of the direct current transformer is respectively connected with each direct current-direct current converter module and used for controlling the output voltage of each direct current-direct current converter module.
According to the anti-droop controlled direct current transformer, the quantitative relation between the phase shift amount of the converter and the input voltage balance is obtained through calculation, and input voltage feedforward is introduced to realize decoupling control of the input voltage and the output voltage of the direct current transformer, so that current balance of the input series output parallel direct current transformer can be realized, and the direct current transformer has good voltage stabilizing performance.
In one embodiment, the dc transformer is an input series output parallel dc transformer; the DC-DC converter module is a double-active full-bridge DC-DC converter module.
A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of the method when executing the program.
A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the above-mentioned method.
Drawings
Fig. 1 is a schematic flowchart of an anti-droop control method of a dc transformer according to an embodiment;
fig. 2 is a schematic flow chart illustrating an anti-droop control method for a dc transformer according to another embodiment;
fig. 3 is a schematic structural diagram of an anti-droop control apparatus of a dc transformer in one embodiment;
FIG. 4 is a schematic diagram of an embodiment of an inverse droop controlled DC transformer;
FIG. 5 is a schematic diagram of an embodiment of an output voltage waveform of a DC transformer;
FIG. 6 is a schematic diagram of an input voltage waveform of an embodiment of a DC to DC converter module;
FIG. 7 is a schematic diagram of an inductor current waveform of the DC to DC converter module in one embodiment;
fig. 8 is a graph illustrating a variation of the output voltage of the dc transformer with the input voltage according to an embodiment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present application and are not intended to limit the present application.
Fig. 1 is a schematic flowchart of an anti-droop control method of a dc transformer in an embodiment, as shown in fig. 1, in an embodiment, the anti-droop control method of the dc transformer includes:
step S120: and acquiring the input voltage of each DC-DC converter module and the output voltage of the DC transformer.
Step S140: and calculating the reference output voltage of each DC-DC converter module according to the input voltage of each DC-DC converter module and the inverse droop coefficient.
Step S160: and calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module.
Step S180: and controlling the output voltage of each DC-DC converter module based on the phase shift amount.
Specifically, the dc transformer is composed of i dc-dc converter modules, where i is greater than or equal to 2, and the i dc-dc converters may be connected in series at the high voltage side and in parallel at the low voltage side to form an input-series output-parallel type dc transformer. The dc-dc converter module may be specifically a dual-active full-bridge dc-dc converter module or the like. First, the input voltage U of each dc-dc converter module can be sampleddiAnd the output voltage U of the DC transformero(ii) a The input voltage U of each DC-DC converter modulediCalculating average input voltage U of each DC-DC converter module in DC transformeravgTo respectively calculate the reference output voltage U of each DC-DC converter modulerefi(ii) a Finally, the voltage U is output according to the referencerefiCalculating the phase shift D of each DC-DC converter moduleiAnd converting the obtained phase shift quantity into a driving pulse through a single phase shift modulator to act on the direct current transformer so as to realize the control of the output voltage of the direct current transformer.
Further, it may be assumed first that the input voltage and the output voltage of the dc transformer satisfy under steady state conditions:
Ud1f(D1)＝Ud2f(D2)＝…＝UdNf(DN)＝Uo
wherein D isiDenotes the phase shift amount of the ith DC-DC converter module, f (D)i) The voltage gain of the ith dc-dc converter module is shown. Meanwhile, according to the power conservation relation of the direct current transformer, the following can be obtained:
Uiniin＝Uoio
wherein iinIs the input current of the direct current transformer. Therefore, the relationship between the output current and the input current of the dc transformer can be obtained as follows:
io1f(D1)＝io2f(D2)＝…＝ioNf(DN)＝iin
thus, the ratio of the input voltage of the ith dc-dc converter module to the total input voltage of the dc transformer can be determined as:
Figure GDA0002987423920000051
when the DC transformer satisfies the input voltage/output current balance, the voltage gains of the DC-DC converter modules are the same, i.e., f (D) is satisfied1)＝f(D2)＝…＝f(DN) At this time, the ratio of the input voltage of the ith dc-dc converter module to the total input voltage of the dc transformer is:
Figure GDA0002987423920000052
further, in the straight lineControl of the current transformer due to the voltage gain function f (D)i) With the amount of phase shift DiIs increased by an increase in; at the same time, the voltage ratio MiIs a voltage gain function f (D)i) Is the decreasing function of. Therefore, when the phase shift amount DiAt increasing voltage ratio MiWill be reduced; this means that for the input series output parallel type dc transformer, increasing the phase shift amount of the i-th module will decrease the input voltage of its corresponding module, thereby decreasing the current/power shared by it.
According to the voltage relation of the direct current transformer under the voltage feedforward anti-droop control method, the output voltage expressions of the direct current-direct current converter module 1 and the direct current-direct current converter module 2 in the direct current transformer can be obtained to meet the following requirements:
Uref1+kinv1(Ud1-Uavg)＝Uref2+kinv2(Ud2-Uavg)
wherein, Uref1And Uref2The reference voltages of the DC-DC converter module 1 and the DC-DC converter module 2 during no-load are respectively; k is a radical ofinv1And kinv2The inverse droop coefficients of the dc-dc converter module 1 and the dc-dc converter module 2, respectively; u shaped1And Ud2The input voltages of the dc-dc converter module 1 and the dc-dc converter module 2, respectively; u shapeavgThe average input voltage of each DC-DC converter module of the DC transformer is obtained.
By combining the relationship between the input voltages of the dc-dc converter modules of the dc transformer, the input voltage expressions of the dc-dc converter module 1 and the dc-dc converter module 2 in the dc transformer can be calculated to satisfy:
Figure GDA0002987423920000061
wherein, UinThe total input voltage of the dc transformer.
According to a voltage unbalance formula and by combining input voltage expressions of a direct current-direct current converter module 1 and a direct current-direct current converter module 2 in a direct current transformer, calculating an inverse droop control method based on voltage feedforward, wherein the input voltage unbalance of the direct current-direct current converter module 1 and the direct current-direct current converter module 2 in the direct current transformer meets the following requirements:
Figure GDA0002987423920000062
and calculating the output voltage of the direct current transformer under the voltage feedforward anti-droop control method by combining the relationship between the output voltages and the input voltages of the direct current-direct current converter module 1 and the direct current-direct current converter module 2 in the direct current transformer under the voltage feedforward anti-droop control method to meet the following requirements:
Figure GDA0002987423920000063
further, the inverse droop coefficient of the dc transformer may be expressed as:
Figure GDA0002987423920000071
the voltage feedforward anti-droop control method suitable for the direct current transformer can be obtained by combining the derivation.
According to the anti-droop control method of the direct current transformer, the quantitative relation between the phase shift amount of the converter and the input voltage balance is obtained through calculation, and the decoupling control of the input voltage and the output voltage of the direct current transformer is realized by introducing the input voltage feedforward, so that the current balance of the input series output parallel direct current transformer can be realized, and the direct current transformer has better voltage stabilization performance.
Fig. 2 is a schematic flow chart of a step of acquiring a zero-crossing point time of an ac signal in an embodiment, as shown in fig. 2, in an embodiment, after step S120, the method further includes:
step S220: and balancing the output current of each DC-DC converter module according to the phase shift amount.
Step S240: and controlling the phases of the inductive currents of the direct current-direct current converter modules to be different by 120 degrees in sequence so as to reduce the pulsation of the output voltage of the direct current transformer.
Specifically, the phase shift D obtained according to the above stepsiAnd the amount of phase shift DiThe relation with the output current of the DC-DC converter module can be determined according to the phase shift quantity DiThe output current of the dc-dc converter module is regulated. For example, in a preferred embodiment, the inductive currents of the dc-dc converter modules of the dc transformer may be controlled to be equal, and at the same time, the inductive currents of the dc-dc converter modules are sequentially different by 120 °, so that the transmission power shared by the dc-dc converter modules in the dc transformer may be equal, and the ripple of the output voltage of the dc transformer may be effectively reduced.
Fig. 3 is a schematic structural diagram of an apparatus for controlling an inverse droop of a dc transformer in an embodiment, as shown in fig. 3, in an embodiment, an apparatus 300 for detecting a voltage includes: the sampling module 320 is configured to obtain an input voltage of each dc-dc converter module and an output voltage of the dc transformer; a reference calculation module 340, configured to calculate a reference output voltage of each dc-dc converter module according to the input voltage of each dc-dc converter module and the inverse droop coefficient; a phase shift amount calculation module 360, configured to calculate a phase shift amount of each dc-dc converter module according to the output voltage of the dc transformer and the reference output voltage of each dc-dc converter module; and an output control module 380 for controlling the output voltage of each dc-dc converter module based on the phase shift amount.
Specifically, in the anti-droop control apparatus 300 for a dc transformer, the sampling module 320 is connected to the input end and the output end of each dc-dc converter module to obtain the input voltage of each dc-dc converter module and the output voltage of the dc transformer, and send the obtained input voltage and output voltage data to the reference calculation module 340. The reference calculation module 340 calculates the reference output voltage of each dc-dc converter module according to the received input voltage and the inverse droop coefficient of each dc-dc converter module, and sends the obtained reference output voltage to the phase shift amount calculation module 360. The phase shift amount calculation module 360 calculates the phase shift amount of each dc-dc converter module according to the output voltage of the dc transformer and the reference output voltage of each dc-dc converter module, and sends the phase shift amount of each dc-dc converter module to the output control module 380. The output control module 380 controls the output voltage of each dc-dc converter module based on the phase shift amount according to the relationship between the phase shift amount and the output voltage. Further, in a preferred embodiment, the output control module 380 includes a single phase shift modulator, and the single phase shift modulator in the output control module 380 converts the phase shift amount into a driving pulse to act on the dc-dc converter modules to control the output voltage of each dc-dc converter module.
The anti-droop control device 300 of the dc transformer obtains the quantization relationship between the phase shift amount of the converter and the input voltage balance through calculation, and introduces the input voltage feedforward to realize the decoupling control of the input voltage and the output voltage of the dc transformer, thereby not only realizing the current balance of the input series output parallel dc transformer, but also enabling the dc transformer to have better voltage stabilization performance.
Fig. 4 is a schematic diagram illustrating an exemplary embodiment of an anti-droop controlled dc transformer, and as shown in fig. 4, in an exemplary embodiment, an anti-droop controlled dc transformer 500 includes at least two dc-dc converter modules 520 and the above-mentioned anti-droop control apparatus 300; the anti-droop control apparatus 300 of the dc transformer is connected to each dc-dc converter module 520, and is configured to control an output voltage of each dc-dc converter module 520.
Specifically, the anti-droop controlled dc transformer 500 includes N (N is greater than or equal to 2) identical dc-dc converter modules 520, only the 1 st dc-dc converter module, the 2 nd dc-dc converter module, and the nth dc-dc converter module are shown in the figure, and the specific number of the dc-dc converter modules may be determined according to actual situations. The number of the anti-droop control devices 300 of the dc transformer may be one, and each of the anti-droop control devices 300 of the dc transformer may be connected to each of the dc-dc converter modules 520, and the number of the anti-droop control devices 300 of the dc transformer may also be plural, for example, one anti-droop control device 300 of the dc transformer is provided at each of the dc-dc converter modules 520 and connected thereto.
Inverse droop control apparatus 300 for dc transformer inputs U to each dc-dc converter module 520diAnd the output voltage U of the DC transformer 500oSamples are taken and then based on the input voltage U of each DC-DC converter module 520diCalculating average input voltage U of each DC-DC converter module of DC transformeravgTo calculate the reference output voltage U of each DC-DC converter module 520 respectivelyrefiFinally, according to the reference output voltage UrefiCalculating the amount of phase shift D for each DC-DC converter module 520iThe obtained phase shift quantity DiThe driving pulse converted by the single phase shift modulator is applied to the dc transformer 500, so as to control the output voltage of the dc transformer 500.
The inverse droop controlled dc transformer 500 obtains the quantitative relationship between the phase shift amount of the converter and the input voltage balance through calculation, and introduces the input voltage feedforward to realize the decoupling control of the input voltage and the output voltage of the dc transformer, thereby not only realizing the current balance of the input series output parallel dc transformer, but also enabling the dc transformer to have better voltage stabilization performance.
Further, in an embodiment, the dc transformer 500 is an input-series output-parallel dc transformer; the dc-dc converter module 520 is a dual active full bridge dc-dc converter module. Among various types of direct current converters, the dual-active full-bridge direct current-direct current converter is suitable for being applied to emerging energy conversion systems such as energy storage and wind power generation due to the advantages of high power density, electrical isolation, bidirectional energy flow, easiness in realizing soft switching and the like. Due to the limitation of the capacity of a power device, a single double-active full-bridge direct current-direct current converter is difficult to apply to a direct current power grid interconnection system, a plurality of double-active full-bridge direct current-direct current converters are connected in series at a high-voltage side to improve the voltage withstanding level, and are connected in parallel at a low-voltage side to increase the current withstanding level, so that a series output parallel type direct current transformer is formed, and the system capacity can be effectively improved to realize voltage matching and electric energy transmission between high-voltage and low-voltage direct current power grids.
FIG. 5 is a diagram illustrating the output voltage waveform of the DC transformer 500 according to an embodiment, as shown in FIG. 5, where the abscissa is time t and the ordinate is the output voltage U of the DC transformer 500o. The dc transformer 500 is mainly divided into three stages during the start-up, which are a power supply side capacitor charging stage, an uncontrolled rectifying stage, and an inverse droop control stage based on voltage feedforward. In a specific embodiment, during the uncontrolled rectifying phase, the output voltage U of the DC transformer is measuredoWhen the voltage reaches 600V, the reverse droop control device 300 of the direct current transformer acts, the drive pulse is switched on to further control the output voltage UoTo 1000V, thereby achieving a soft start operation of the dc transformer 500.
FIG. 6 is a schematic diagram of an input voltage waveform of the DC-DC converter modules 520 according to one embodiment, as shown in FIG. 6, with time t on the abscissa and input voltage U on the ordinate for each DC-DC converter module 520dUnder the voltage feedforward-based anti-droop control method, the input voltage difference caused by each DC-DC converter module 520 in the soft start stage is rapidly eliminated, so that the voltage U of each DC-DC converter module 520 is rapidly eliminateddAnd balancing, thereby realizing transmission power balance of the direct current transformer 500.
FIG. 7 is a schematic diagram of the inductor current waveform of the DC-DC converter module according to one embodiment, as shown in FIG. 7, where the abscissa is time t and the ordinate is the inductor current i of each DC-DC converter module 520LUnder the voltage feedforward-based anti-droop control method, the inductor currents of the dc-dc converter modules 520 in the dc transformer 500 are almost equal, which indicates that the transmission power shared by the dc-dc converter modules 520The rates are equal, and the inductor currents of the dc-dc converter modules 520 differ by 120 ° in sequence, which reduces the ripple of the output voltage.
FIG. 8 is a graph illustrating the variation of the output voltage of the DC transformer with the input voltage according to an embodiment, as shown in FIG. 8, the abscissa is the average input voltage U of each DC-DC converter module 520 in the DC transformer 500avgThe ordinate is the output voltage U of the DC transformer 500oUnder the conventional reverse droop control method, the feedback of the input voltage has a large influence on the reference output voltage of the dc-dc converter module 520, so that the dc transformer 500 deviates from the original set value of the reference output voltage to some extent; meanwhile, when the input voltage changes, the output voltage of the dc transformer 500 has a large change range and poor voltage stabilization performance. In the voltage feedforward-based anti-droop control method of the embodiment, when the input voltage of the dc transformer 500 changes, the output voltage is always stabilized near the reference voltage, and the voltage stabilization performance is good.
In one embodiment, a computer device is provided, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, the processor executing the program to perform the steps of: acquiring input voltage of each DC-DC converter module and output voltage of a DC transformer; calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module; calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module; and controlling the output voltage of each DC-DC converter module based on the phase shift amount.
In one embodiment, a computer readable storage medium is provided, having a computer program stored thereon, which when executed by a processor, may cause the processor to perform the steps of: acquiring input voltage of each DC-DC converter module and output voltage of a DC transformer; calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module; calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module; and controlling the output voltage of each DC-DC converter module based on the phase shift amount.
For the above limitations of the computer-readable storage medium and the computer device, reference may be made to the above specific limitations of the method, which are not described herein again.
It should be noted that, as one of ordinary skill in the art can appreciate, all or part of the processes of the above methods may be implemented by instructing related hardware through a computer program, and the program may be stored in a computer-readable storage medium; the above described programs, when executed, may comprise the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM) or a Random Access Memory (RAM).
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present application, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the concept of the present application, which falls within the scope of protection of the present application. Therefore, the protection scope of the present patent shall be subject to the appended claims.

Claims (10)

1. The anti-droop control method of the direct current transformer comprises the following steps that the direct current transformer comprises at least two direct current-direct current converter modules, and the direct current transformer is an input-series output-parallel direct current transformer; characterized in that the method comprises:
acquiring input voltage of each DC-DC converter module and output voltage of the DC transformer;
calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module;
calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module;
and converting the phase shift quantity into a driving pulse through a single phase shift modulator, and applying the driving pulse to the direct current transformer so as to control the output voltage of each direct current-direct current converter module.
2. The method of claim 1, further comprising:
and balancing the output current of each DC-DC converter module according to the phase shift amount.
3. The method of claim 1, further comprising:
and controlling the phases of the inductive currents of the DC-DC converter modules to be different by 120 degrees in sequence so as to reduce the pulsation of the output voltage of the DC transformer.
4. The method of claim 1, wherein the dc-dc converter module is a dual active full bridge dc-dc converter module.
5. An anti-droop control device of a direct current transformer comprises at least two direct current-direct current converter modules, wherein the direct current transformer is an input-series output-parallel direct current transformer; characterized in that the device comprises:
the sampling module is used for acquiring the input voltage of each DC-DC converter module and the output voltage of the DC transformer;
the reference calculation module is used for calculating the reference output voltage of each DC-DC converter module according to the input voltage and the inverse droop coefficient of each DC-DC converter module;
the phase shift amount calculation module is used for calculating the phase shift amount of each DC-DC converter module according to the output voltage of the DC transformer and the reference output voltage of each DC-DC converter module;
and the output control module comprises a single phase shift modulator and is used for converting the phase shift amount into a driving pulse through the single phase shift modulator and applying the driving pulse to the direct current transformer so as to control the output voltage of each direct current-direct current converter module.
6. The apparatus of claim 5, wherein the inductor currents of the DC-DC converter modules are sequentially 120 ° out of phase with each other.
7. An anti-droop controlled dc transformer, comprising at least two dc-dc converter modules and an anti-droop control apparatus for a dc transformer according to claim 5 or 6 above;
the anti-droop control device of the direct current transformer is respectively connected with each direct current-direct current converter module and used for controlling the output voltage of each direct current-direct current converter module.
8. The direct current transformer according to claim 7, wherein the direct current transformer is an input series output parallel type direct current transformer; the DC-DC converter module is a double-active full-bridge DC-DC converter module.
9. A computer device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, characterized in that the steps of the method of any of claims 1 to 4 are implemented when the program is executed by the processor.
10. A computer-readable storage medium, on which a computer program is stored which, when being executed by a processor, carries out the steps of the method according to any one of claims 1 to 4.
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