Current sharing control method based on high-power rectifier module and application

Abstract

The invention discloses a current sharing control method based on high-power rectifier modules, which comprises the following steps: respectively acquiring output current of a plurality of rectifier modules which are connected in parallel, and calculating average current of all rectifier modules; inputting the average current and the actual output current of the current rectification module into a current sharing ring PI regulator, generating a regulation signal, and superposing the regulation signal to an input end correction voltage given value of a voltage control ring; and respectively generating a voltage control signal and a current control signal through the voltage loop PI regulator and the current loop PI regulator, carrying out competitive comparison on the voltage control signal and the current control signal, and selecting a smaller value as a PWM (Pulse-Width Modulation) regulating variable to regulate the output voltage until the output current of the rectifier module is dynamically balanced. The problems that in the prior art, due to the fact that a current sharing circuit needs to be designed for multi-module power source parallel current sharing, adaptability is poor, cost is high, and when digital current sharing is adopted, fluctuation of a current outer ring easily causes great instability of output voltage can be solved.

Description

Technical Field

[0001] The present application relates to the technical field of high-power power conversion, and particularly to a current sharing control method, device, electronic equipment and computer-readable storage medium based on a high-power rectifier module. Background Art

[0002] Communication power supply is an important power supply device in a communication system, and a rectifier is a crucial component of the communication power supply. With the continuous improvement of the requirements for system power supply reliability and power capacity in systems such as ships and aerospace, the traditional centralized power supply mode can no longer meet the requirements of actual applications today. To achieve high-power output of the communication power supply, parallel connection of multiple power modules is an effective solution. Parallel connection of multiple power modules can not only share the load power but also reduce the voltage withstand requirements and current stress of power devices in each module, relaxing the requirements for power device selection. In addition, parallel connection of multiple modules can also improve the adaptability of the power supply device, and the number of parallel modules can be flexibly adjusted according to the power supply demand. For a high-power power supply system, modularization can also improve the reliability of the system.

[0003] In a power supply system with parallel connection of multiple modules, current sharing control between modules is extremely important. Current imbalance between modules will not only cause instability of the output DC bus voltage but also shorten the lifespan of the module carrying more current. In existing current sharing technologies, an additional current sharing circuit is mostly used in parallel on the system to achieve module current sharing, but this circuit is mostly affected by the environment and has poor system portability. In contrast, using digital technology for current sharing control can avoid additional circuit design, reduce the power supply cost to a certain extent, and has higher flexibility and adaptability. However, existing digital current sharing technologies generally adopt a simple control method with a double-loop nested structure of current outer loop and voltage inner loop. Disturbances of AC-side current and voltage, switching of the number of parallel modules, or load disturbances will all cause fluctuations in the current outer loop. And this control structure has a large coupling between voltage and current control, so fluctuations in the current outer loop are likely to cause significant instability of the output voltage. In addition, the double-loop nested control will also affect the dynamic response ability of the control loop. When a step change occurs at the AC input end, the control loop responds slowly, easily leading to the generation of inrush current, which may damage the equipment. Summary of the Invention

[0004] To overcome the above defects of the prior art, embodiments of the present invention provide a current sharing control method and application based on a high-power rectifier module, which can solve the problems in the prior art that current sharing of parallel-connected multiple-module power supplies requires the design of a current sharing circuit, resulting in poor adaptability and high cost, and that fluctuations in the current outer loop are likely to cause significant instability of the output voltage when using existing digital current sharing technologies.

[0005] On the one hand, an embodiment of the present invention provides a current sharing control method based on a high-power rectification module, including: respectively obtaining the output currents of a plurality of rectification modules connected in parallel, and calculating the average current of all the rectification modules according to the output currents; inputting the average current and the actual output current of the current rectification module into a current sharing loop PI regulator to generate an adjustment signal and superimposing it on the input end of the voltage control loop to correct the voltage given value; respectively generating a voltage control signal and a current control signal through a voltage loop PI regulator and a current loop PI regulator according to the corrected voltage given value, and competing and comparing the two, and selecting the smaller value as the PWM adjustment amount; adjusting the output voltage according to the PWM adjustment amount, if the current of the current rectification module is greater than the average current, the output voltage is reduced, otherwise the output voltage is increased until the output currents of the parallel rectification modules are dynamically balanced.

[0006] In an embodiment of the present invention, the rectification module includes a three-phase Vienna rectification unit and a DCDC conversion unit. The three-phase Vienna rectification unit is used to convert three-phase alternating current into a constant high-voltage direct current; the DCDC conversion unit is used to convert the high-voltage direct current into an adjustable high-voltage direct current and execute the current sharing control method.

[0007] In an embodiment of the present invention, the adjustment signal of the current sharing loop is compensated to the input end of the voltage loop after being limited, and the limiting range is a preset voltage adjustment threshold.

[0008] In an embodiment of the present invention, the voltage loop and the current loop are parallel control loops, and the smaller value is selected as the main control signal by comparing the output values of the two to improve the dynamic response ability and anti-disturbance ability.

[0009] In an embodiment of the present invention, the parameters of the voltage loop PI regulator and the current loop PI regulator are dynamically optimized according to the grid environment to cope with the step change of the voltage on the AC side or the load.

[0010] In an embodiment of the present invention, a filter and a relay board are configured at the input end of the three-phase Vienna rectification unit to suppress grid harmonics and achieve input protection.

[0011] In an embodiment of the present invention, the voltage given value is compensated through the current loop in the single rectification module operation mode to maintain the stability of the output voltage.

[0012] On the other hand, an embodiment of the present invention further provides a current sharing control device based on a high-power rectification module, including: an average current calculation module, configured to respectively obtain the output currents of a plurality of rectification modules connected in parallel, and calculate the average current of all the rectification modules according to the output currents; a current sharing PI adjustment module, configured to input the average current and the actual output current of the current rectification module into a current sharing loop PI regulator, generate an adjustment signal and superimpose it on the input end of the voltage control loop to correct the voltage given value; a voltage-current competition module, configured to respectively generate a voltage control signal and a current control signal through a voltage loop PI regulator and a current loop PI regulator according to the corrected voltage given value, and perform a competition comparison between the two, and select the smaller value as the PWM adjustment amount; a current dynamic equalization module, configured to adjust the output voltage according to the PWM adjustment amount, if the current of the current rectification module is greater than the average current, then reduce the output voltage, otherwise increase the output voltage until the output currents of the parallel rectification modules are dynamically balanced.

[0013] On another aspect, an embodiment of the present invention further provides an electronic device, including: a memory and one or more processors connected to the memory, the memory stores a computer program, and the processor is configured to execute the computer program to implement the current sharing control method based on a high-power rectification module as described in any one of the above embodiments.

[0014] On yet another aspect, an embodiment of the present invention further provides a computer-readable storage medium, the computer-readable storage medium stores computer-executable instructions, and the computer-executable instructions are configured to execute the current sharing control method based on a high-power rectification module as described in any one of the above embodiments.

[0015] As can be seen from the above, compared with the prior art, the above embodiments of the present invention can at least have one or more of the following beneficial effects: A current sharing control strategy based on high-power rectifier modules is provided. By comparing the current of the current rectifier module with the average current of all parallel rectifier modules, the error value is limited and then compensated to the input end of the voltage control loop, and then the voltage error is adjusted to regulate the magnitude of the output voltage, so as to realize the dynamic balance of the currents of several parallel modules, improve the stability of the output voltage and current of the device, ensure the balance of the output currents of the parallel modules and the dynamic response ability of the system; there is no need to design an additional current sharing control circuit, and the digital current sharing technology is used to achieve the balance of the output currents of high-power rectifier modules, and it is not limited by the number of rectifier modules connected in parallel in the high-power power supply system. All parallel modules operate independently without distinction of primary and secondary, with high flexibility and applicability; compared with the traditional voltage-current nested control method, the proposed control strategy of competition between the voltage loop and the current loop uses a simple control loop, which not only ensures the balance of the output currents of the parallel modules, but also has better dynamic response ability and anti-disturbance ability, and is applicable to complex power grid environments. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings described herein are used to provide a further understanding of the present invention and constitute a part of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings: Figure 1 is a flowchart of a current sharing control method based on high-power rectifier modules provided by an embodiment of the present invention; Figure 2 is a schematic diagram of the control logic of a current sharing control method based on high-power rectifier modules provided by an embodiment of the present invention; Figure 3 is a block diagram of a dual-module parallel structure of high-power rectifier modules provided by an embodiment of the present invention; Figure 4 is a schematic diagram of the constituent units of high-power rectifier modules provided by an embodiment of the present invention; Figure 5 is a schematic diagram of the structure of a current sharing control device based on high-power rectifier modules provided by an embodiment of the present invention; Figure 6 is a schematic diagram of the structure of an electronic device provided by an embodiment of the present invention; Figure 7 is a schematic diagram of the structure of a computer-readable storage medium provided by an embodiment of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0017] It should be noted that, without conflict, the embodiments in the present invention and the features in the embodiments may be combined with each other. The present invention will be described below with reference to the drawings and in conjunction with the embodiments.

[0018] In order to enable those of ordinary skill in the art to better understand the technical solution of the present invention, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments, and all should fall within the protection scope of the present invention.

[0019] It should be noted that the terms "first", "second", etc. in the specification and claims of the present invention and the above-mentioned drawings are used to distinguish similar objects, and do not necessarily need to be used to describe a specific order or sequence. It should be understood that such terms can be interchanged under appropriate circumstances so that the embodiments of the present invention described here can be implemented in an order other than those illustrated or described here. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0020] It should also be noted that the division of multiple embodiments in the present invention is only for the convenience of description and should not constitute a special limitation. The features in various embodiments can be combined and cross-referenced without conflict.

[0021] As Figure 1 shown, the first embodiment of the present invention proposes a current sharing control method based on a high-power rectifier module. This method first obtains the output currents of several rectifier modules connected in parallel respectively, and calculates the average current of all rectifier modules according to these output currents. Then, as Figure 2 shown, the average current and the actual output current of the current rectifier module are input into the current sharing loop PI regulator to generate an adjustment signal and superimpose it on the input end of the voltage control loop to correct the voltage set value. Then, according to the corrected voltage set value, a voltage control signal and a current control signal are generated respectively through the voltage loop PI regulator and the current loop PI regulator, and the two are competitively compared, and the smaller value is selected as the PWM adjustment amount. Finally, the output voltage is adjusted according to the PWM adjustment amount. If the current of the current rectifier module is greater than the average current, the output voltage is reduced, otherwise it is increased, until the output currents of the parallel rectifier modules are dynamically balanced.

[0022] Specifically, as Figure 3As shown, in a power supply system with multi-module parallel connection, the current sharing control among modules is extremely important. If the currents among modules are unbalanced, it will not only lead to unstable output DC bus voltage, but also shorten the lifespan of the module carrying more current. By separately obtaining the output currents of several rectifier modules connected in parallel and calculating the average current of all rectifier modules based on these output currents, this problem can be effectively solved. Inputting the average current and the actual output current of the current rectifier module into the current sharing loop PI regulator to generate a regulation signal and superimpose it on the input end of the voltage control loop to correct the voltage set value. This step enables the voltage control loop to adjust according to the actual situation, thereby improving the stability and reliability of the system.

[0023] Furthermore, as Figure 4 shown, the rectifier module includes two main parts: a three-phase Vienna rectification unit and a DCDC conversion unit. The function of the three-phase Vienna rectification unit is to convert the input three-phase alternating current into a constant high-voltage direct current. This conversion process can effectively improve the utilization efficiency of electric energy and reduce harmonic interference. The DCDC conversion unit is responsible for further converting the high-voltage direct current into an adjustable high-voltage direct current, thereby achieving precise control of the output voltage. Through this design, it can be ensured that the rectifier module can provide stable high-voltage direct current under various working conditions, and at the same time, the current dynamic balance of multiple rectifier modules can be achieved through the current sharing control method.

[0024] The design of the three-phase Vienna rectification unit can adopt various implementation methods. For example, a filter and a relay board can be configured at its input end to suppress grid harmonics and achieve input protection. The function of the filter is to reduce the interference of high-order harmonics to the system, thereby improving the power quality of the system. The relay board is used to quickly cut off the power supply in case of system failure to protect the rectifier module and subsequent equipment. The design of the DCDC conversion unit also has various implementation methods, and efficient DC voltage conversion can be achieved by adopting different control strategies and circuit topologies. For example, synchronous rectification technology can be adopted to improve the conversion efficiency, or multi-phase parallel technology can be used to share the current load and reduce the stress on a single power device. Further, according to specific application requirements, the control parameters of the DCDC conversion unit can be optimized to improve the dynamic response ability and stability of the system.

[0025] Furthermore, by compensating the regulated signal of the current sharing loop to the input terminal of the voltage control loop after amplitude limiting processing, the problems of unstable output voltage and shortened module lifespan caused by current imbalance can be effectively avoided. The amplitude limiting processing restricts the amplitude of the regulated signal to ensure it is within the preset voltage regulation threshold range, thereby preventing excessive regulated signals from impacting the system. Specifically, after the regulated signal of the current sharing loop is generated, it will first undergo amplitude limiting processing, and the range of the amplitude limiting processing is the preset voltage regulation threshold. This threshold can be adjusted according to specific application requirements. The regulated signal after amplitude limiting processing is then compensated to the input terminal of the voltage control loop to correct the voltage set value. By this method, while ensuring the current sharing effect, the system instability problem caused by excessive regulated signals can be avoided, improving the system's dynamic response ability and anti-disturbance ability.

[0026] Furthermore, the parallel control loop design of the voltage control loop and the current control loop is mainly to improve the dynamic response ability and anti-disturbance ability. When faced with this situation, the traditional double-loop nested control method is prone to causing fluctuations in the outer current loop, thereby affecting the stability of the output voltage. Through the parallel control loop design, the voltage and current can be controlled independently, and the smaller value of their output values is selected as the dominant control signal by comparison, reducing the coupling of voltage and current control and improving the system's dynamic response ability and anti-disturbance ability.

[0027] As a preferred implementation, the voltage control loop and the current control loop can adopt different PI regulator parameters to adapt to different grid environments. For example, when the grid voltage is stable, slower response parameters can be adopted to ensure the stability of the output voltage; when the grid voltage fluctuates greatly, faster response parameters can be adopted to improve the system's dynamic response ability. Through the parallel control loop design in this embodiment, the system's dynamic response ability and anti-disturbance ability are improved, solving the problems of large coupling of voltage and current control and poor dynamic response ability in the prior art, and ensuring that the system can respond quickly and maintain the stability of the output voltage when there is a step change in the AC side voltage or load.

[0028] Furthermore, the parameters of the voltage loop PI regulator and the current loop PI regulator are dynamically optimized according to the grid environment to cope with the step change in the AC side voltage or load. In this way, the system's dynamic response ability and anti-disturbance ability can be effectively improved, and the current fluctuations and unstable output voltage caused by the voltage or load mutation can be avoided.

[0029] Specifically, the parameters of the voltage-loop PI regulator and the current-loop PI regulator can be dynamically adjusted according to the real-time monitored grid voltage and load conditions. For example, when a large fluctuation in the grid voltage is detected, the parameters of the PI regulator can be adjusted to respond quickly and stabilize the output voltage. Similarly, when the load changes suddenly, the parameters of the PI regulator can also be dynamically optimized to quickly adjust the output current and ensure the current balance of each parallel module.

[0030] Furthermore, a filter and a relay board are configured at the input end of the three-phase Vienna rectifier unit. The function of the filter is to suppress grid harmonics, and the relay board is used to achieve input protection. Through this configuration, the impact of grid harmonics on the system can be effectively reduced, and the stability and reliability of the power supply module can be improved. Specifically, the filter can filter out the high-frequency harmonic components in the grid to ensure the smoothness of the input current, and the relay board can quickly disconnect the circuit in case of an abnormality to protect the equipment from damage. For example, in practical applications, the filter can adopt various types such as LC filters or active filters, and is selected and designed according to the specific grid environment and harmonic characteristics. The relay board can be configured with fast fuses and electronic switches to achieve fast response and protection functions.

[0031] Furthermore, in the single rectifier module operation mode, the stability of the output voltage can be effectively maintained by compensating the voltage reference value through the current loop. The core of this technical solution lies in using the current loop to dynamically adjust the voltage reference value, so as to ensure that the output voltage remains stable under various operating conditions. Specifically, when a single rectifier module is working, the current loop will monitor the output current of the module in real time and adjust the voltage reference value according to the actual situation. If the output current changes, the current loop will immediately respond and compensate the voltage reference value to ensure that the output voltage is not affected. This dynamic adjustment mechanism can effectively cope with load changes and grid fluctuations, and ensure the stability of the output voltage. For example, in the case of a sudden increase in load, the output current of the single rectifier module will increase accordingly. At this time, the current loop will detect the change in current and immediately adjust the voltage reference value to keep the output voltage stable. On the contrary, when the load decreases, the current loop will also make corresponding adjustments to reduce the voltage reference value and avoid too high output voltage.

[0032] In summary, the current-sharing control method based on high-power rectifier modules proposed in the first embodiment of the present invention compares the current of the current rectifier module with the average current of all parallel rectifier modules, limits the error value, and then compensates it to the input end of the voltage control loop. Furthermore, it adjusts the magnitude of the output voltage by adjusting the voltage error to achieve the dynamic balance of the currents of several parallel modules, improving the stability of the output voltage and current of the device, ensuring the balance of the output currents of the parallel modules and the dynamic response of the system; there is no need to design an additional current-sharing control circuit, and digital current-sharing technology is used to achieve the balance of the output currents of high-power rectifier modules, and it is not limited by the number of rectifier modules connected in parallel in a high-power power supply system. All parallel modules operate independently without distinction of primary and secondary, with high flexibility and applicability; compared with the traditional voltage-current nested control method, the control strategy of voltage-loop and current-loop competition uses a simple control loop to not only ensure the balance of the output currents of parallel modules, but also has better dynamic response ability and anti-disturbance ability, and is suitable for complex power grid environments.

[0033] In addition, as Figure 5 shown, the second embodiment of the present invention also proposes a current-sharing control device based on high-power rectifier modules, including: an average current calculation module 201, a current-sharing PI adjustment module 202, a voltage-current competition module 203, and a current dynamic balance module 204.

[0034] Among them, the output current calculation module 201 is used to respectively obtain the output currents of several rectifier modules connected in parallel, and calculate the average current of all the rectifier modules according to the output currents; the current-sharing PI adjustment module 202 is used to input the average current and the actual output current of the current rectifier module into the current-sharing loop PI regulator, generate an adjustment signal and superimpose it on the input end of the voltage control loop to correct the voltage set value; the voltage-current competition module 203 is used to respectively generate a voltage control signal and a current control signal through the voltage-loop PI regulator and the current-loop PI regulator according to the corrected voltage set value, and compare the two for competition, and select the smaller value as the PWM adjustment amount; the current dynamic balance module 204 is used to adjust the output voltage according to the PWM adjustment amount. If the current of the current rectifier module is greater than the average current, the output voltage is reduced, otherwise it is increased, until the output currents of the parallel rectifier modules are dynamically balanced.

[0035] The current sharing control method implemented by the current sharing control device based on high-power rectifier modules disclosed in the second embodiment of the present invention is as described in the aforementioned first embodiment, so it will not be elaborated here in detail. Optionally, each module in the second embodiment and the above other operations or functions are respectively for implementing the method described in the first embodiment, and the beneficial effects of the current sharing control device based on high-power rectifier modules provided in this embodiment are the same as those of the current sharing control method based on high-power rectifier modules provided in the aforementioned first embodiment. For the sake of brevity, they will not be repeated here.

[0036] As Figure 6 shown, the third embodiment of the present invention further proposes an electronic device, for example, including: at least one processing unit and at least one storage unit, wherein the storage unit stores a computer program, and when the computer program is executed by the processing unit, the processing unit is caused to execute the method described in the first embodiment, and the beneficial effects of the electronic device provided in this embodiment are the same as those of the current sharing control method based on high-power rectifier modules provided in the first embodiment.

[0037] As Figure 7 shown, the fourth embodiment of the present invention further provides a computer-readable storage medium, on which a computer program is stored, and when the program is executed by a processor, the steps of the above method are implemented, and the beneficial effects of the computer-readable storage medium provided in this embodiment are the same as those of the current sharing control method based on high-power rectifier modules provided in the first embodiment.

[0038] Among them, the computer-readable storage medium may include, but is not limited to, any type of disk, including floppy disks, optical disks, DVDs, CD-ROMs, microdrives, and magneto-optical disks, ROMs, RAMs, EPROMs, EEPROMs, DRAMs, VRAMs, flash memory devices, magnetic or optical cards, nanosystems (including molecular memory ICs), or any type of medium or device suitable for storing instructions and / or data.

[0039] It should be noted that for the foregoing method embodiments, for the sake of simple description, they are all expressed as a series of action combinations. However, those skilled in the art should know that the present application is not limited by the described action sequence, because according to the present application, certain steps can be performed in other sequences or simultaneously. Secondly, those skilled in the art should also know that the embodiments described in the specification are all preferred embodiments, and the actions and modules involved are not necessarily essential to the present application.

[0040] In the above embodiments, the descriptions of each embodiment have their own focuses. For the parts not detailed in a certain embodiment, reference can be made to the relevant descriptions of other embodiments.

[0041] In several embodiments provided in the present application, it should be understood that the disclosed device can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division. In actual implementation, there may be other division methods. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections between each other can be through some service interfaces. The indirect couplings or communication connections of the devices or units can be in electrical or other forms.

[0042] The units described as separate components may or may not be physically separated. The components displayed as units may or may not be physical units, that is, they can be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0043] In addition, each functional unit in various embodiments of the present application can be integrated in a processing unit, or each unit can exist physically alone, or two or more units can be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0044] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable memory. Based on this understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a memory and includes several instructions for causing a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned memory includes: USB flash drives, read-only memories (ROMs), random access memories (RAMs), mobile hard disks, magnetic disks, or optical disks, etc., which can store program codes.

[0045] Those of ordinary skill in the art can understand that all or part of the steps in the various methods of the above embodiments can be completed by instructing relevant hardware through a program. This program can be stored in a computer-readable memory. The memory can include: flash drives, read-only memories (ROMs), random access memories (RAMs), magnetic disks, or optical disks, etc.

[0046] The above are only exemplary embodiments of the present disclosure, and the scope of the present disclosure cannot be limited thereby. That is, any equivalent changes and modifications made in accordance with the teachings of the present disclosure still fall within the scope covered by the present disclosure. After considering the specification and practicing the present disclosure herein, those skilled in the art will readily conceive of other embodiments of the present disclosure. This application is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common general knowledge or conventional technical means in the technical field not recorded in the present disclosure. The specification and embodiments are only regarded as exemplary, and the scope and spirit of the present disclosure are defined by the claims.

[0047] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, it should be considered as the scope recorded in this specification.

[0048] It is easy for those skilled in the art to understand that the above are only preferred embodiments of the present invention and are not used to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A current sharing control method based on a high-power rectifier module, characterized in that including: respectively obtain the output currents of a plurality of rectifier modules connected in parallel, and calculate the average current of all the rectifier modules according to the output currents; input the average current and the actual output current of the current rectifier module into the current sharing loop PI regulator to generate a regulation signal and superimpose it on the input end of the voltage control loop to correct the voltage set value; respectively generate a voltage control signal and a current control signal through the voltage loop PI regulator and the current loop PI regulator according to the corrected voltage set value, and perform a competition comparison between the two, and select the smaller value as the PWM regulation amount; adjust the output voltage according to the PWM regulation amount. If the current of the current rectifier module is greater than the average current, the output voltage is reduced, otherwise the output voltage is increased until the output currents of the parallel rectifier modules are dynamically balanced.

2. The current sharing control method based on a high-power rectifier module according to claim 1, characterized in that The rectifier module includes a three-phase Vienna rectifier unit and a DCDC conversion unit. The three-phase Vienna rectifier unit is used to convert three-phase alternating current into a constant high-voltage direct current; the DCDC conversion unit is used to convert the high-voltage direct current into an adjustable high-voltage direct current and execute the current sharing control method.

3. The current sharing control method based on a high-power rectifier module according to claim 1, wherein The regulation signal of the current sharing loop is compensated to the input end of the voltage loop after being limited, and the limiting range is a preset voltage regulation threshold.

4. The current sharing control method based on a high-power rectification module according to claim 1, characterized in that The voltage loop and the current loop are parallel control loops, and the smaller value is selected as the main control signal by comparing the output values of the two to improve the dynamic response ability and anti-disturbance ability.

5. The current sharing control method based on a high-power rectification module according to claim 1, wherein The parameters of the voltage loop PI regulator and the current loop PI regulator are dynamically optimized according to the power grid environment to cope with the step changes of the AC side voltage or load.

6. The current sharing control method based on a high-power rectifier module according to claim 2, characterized in that, The input end of the three-phase Vienna rectifier unit is configured with a filter and a relay board for suppressing power grid harmonics and realizing input protection.

7. The current sharing control method based on a high-power rectifier module according to claim 1, wherein compensate the voltage set value through the current loop in the single rectifier module operation mode to maintain the stability of the output voltage.

8. A current sharing control device based on a high-power rectifier module, characterized in that, including: an average current calculation module, configured to respectively obtain the output currents of a plurality of rectifier modules connected in parallel, and calculate the average current of all the rectifier modules according to the output currents; a current sharing PI regulation module, configured to input the average current and the actual output current of the current rectifier module into the current sharing loop PI regulator to generate a regulation signal and superimpose it on the input end of the voltage control loop to correct the voltage set value; a voltage-current competition module, configured to respectively generate a voltage control signal and a current control signal through the voltage loop PI regulator and the current loop PI regulator according to the corrected voltage set value, and perform a competition comparison between the two, and select the smaller value as the PWM regulation amount; a current dynamic balance module, configured to adjust the output voltage according to the PWM regulation amount. If the current of the current rectifier module is greater than the average current, the output voltage is reduced, otherwise the output voltage is increased until the output currents of the parallel rectifier modules are dynamically balanced.

9. An electronic device, characterized in that, including: a memory and one or more processors connected to the memory, the memory stores a computer program, and the processor is configured to execute the computer program to implement the current sharing control method based on a high-power rectifier module as described in any one of claims 1-7.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions for performing the current sharing control method based on a high-power rectification module according to any one of claims 1-7.

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