Current Sharing Control Method, Device, Equipment and System for a Power Supply System

Abstract

The present invention discloses a current sharing control method, device, equipment and system for a power supply system. The power supply system is composed of n power supply units connected in parallel, where n is greater than 1. The method includes: collecting the output currents of the n power supply units; calculating the average value of the output currents of the n power supply units to obtain an average current; selecting m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as main power supply units, and taking the remaining n - m power supply units as slave power supply units, where m is greater than or equal to 1; using a preset voltage value as a voltage reference value to perform droop current sharing control on the m main power supply units; and using the average current as a current reference value to perform current loop current sharing control on the n - m slave power supply units. The present invention can accelerate the response speed of the control loop to disturbances so as to improve the anti-interference ability of the power supply system.

Description

Technical Field

[0001] The present invention relates to the field of power electronics technology, and in particular, to a current sharing control method, device, equipment and system for a power supply system. Background Art

[0002] Currently, the existing current sharing control methods for multiple parallel power supply units mainly include: two control methods, namely the droop method and the active method. In the traditional droop method, the output feedback signal of each power supply unit is used to change the output resistance of the power supply unit, so that the slopes of the external characteristic curves of each power supply unit tend to be the same, so as to achieve the purpose of current sharing control. In the traditional active method, all parallel power supply units are connected by an interconnection communication line to provide the same current reference signal for each power supply unit, so as to achieve the purpose of current sharing control.

[0003] However, since each power supply unit in the traditional droop method needs to control the output voltage, the overall response speed of the power supply system to disturbances is slow. And in the traditional active method, when any power supply unit fails and cannot output current, the output voltage of the power supply system is prone to large oscillations or drops, resulting in poor overall anti-interference ability. Summary of the Invention

[0004] Embodiments of the present invention provide a current sharing control method, device, equipment and system for a power supply system, which can accelerate the response speed of the control loop to disturbances, so as to improve the anti-interference ability of the power supply system.

[0005] To achieve the above object, an embodiment of the present invention provides a current sharing control method for a power supply system, where the power supply system is composed of n power supply units connected in parallel; where n is greater than 1; the method includes:

[0006] Collect the output currents of the n power supply units;

[0007] Calculate the mean value of the output currents of the n power supply units to obtain the average current;

[0008] Select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as the main power supply units, and use the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1;

[0009] Perform droop current sharing control on the m main power supply units with a preset voltage value as the voltage reference value;

[0010] Perform current loop current sharing control on the n - m slave power supply units with the average current as the current reference value.

[0011] As an improvement of the above solution, where I avgis the average current, I max is the rated maximum output current of the power supply unit, and [] is the ceiling function.

[0012] As an improvement to the above solution, the preset voltage value is used as the voltage reference value to perform droop current sharing control on the m main power supply units, specifically as follows:

[0013] Multiply the output currents of the m main power supply units by a first proportionality coefficient to obtain current feedback signals of the m main power supply units;

[0014] Multiply the output voltages of the m main power supply units by a second proportionality coefficient to obtain voltage feedback signals of the m main power supply units;

[0015] Multiply the current feedback signals and the voltage feedback signals of the m main power supply units to obtain output feedback signals of the m main power supply units;

[0016] Use the preset voltage value as the voltage reference value to compare the output feedback signals of the m main power supply units with the voltage reference value to obtain voltage error amounts of the m main power supply units;

[0017] Control the PWM controllers of the m main power supply units to perform pulse width modulation through the voltage error amounts of the m main power supply units to adjust the currents of the m main power supply units.

[0018] As an improvement to the above solution, the average current is used as the current reference value to perform current loop current sharing control on the n - m slave power supply units, specifically as follows:

[0019] Multiply the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain current feedback signals of the n - m slave power supply units;

[0020] Use the average current as the current reference value to compare the current feedback signals of the n - m slave power supply units with the current reference value to obtain current loop error amounts of the n - m slave power supply units;

[0021] Control the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the current loop error amounts of the n - m slave power supply units to adjust the currents of the n - m slave power supply units.

[0022] To achieve the above object, an embodiment of the present invention correspondingly provides a current sharing control device for a power supply system. The power supply system is composed of n power supply units connected in parallel; where n is greater than 1; the device includes:

[0023] A data acquisition module for acquiring the output currents of the n power supply units;

[0024] A data operation module, which is used to calculate the average value of the output currents of n power supply units to obtain an average current;

[0025] A unit division module, which is used to select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as main power supply units, and use the remaining n - m power supply units as slave power supply units; where m is greater than or equal to 1;

[0026] A first current sharing control module, which is used to perform droop current sharing control on the m main power supply units with a preset voltage value as the voltage reference value;

[0027] A second current sharing control module, which is used to perform current loop current sharing control on the n - m slave power supply units with the average current as the current reference value.

[0028] As an improvement of the above solution, where I avg is the average current, I max is the rated maximum output current of the power supply unit, and [] is the ceiling function.

[0029] As an improvement of the above solution, the first current sharing control module is specifically used for:

[0030] Multiply the output currents of the m main power supply units by a first proportionality coefficient to obtain current feedback signals of the m main power supply units;

[0031] Multiply the output voltages of the m main power supply units by a second proportionality coefficient to obtain voltage feedback signals of the m main power supply units;

[0032] Multiply the current feedback signals and the voltage feedback signals of the m main power supply units to obtain output feedback signals of the m main power supply units;

[0033] Use a preset voltage value as the voltage reference value to compare the output feedback signals of the m main power supply units with the voltage reference value to obtain voltage error amounts of the m main power supply units;

[0034] Control the PWM controllers of the m main power supply units to perform pulse width modulation through the voltage error amounts of the m main power supply units to adjust the currents of the m main power supply units.

[0035] As an improvement of the above solution, the second current sharing control module is specifically used for:

[0036] Multiply the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain current feedback signals of the n - m slave power supply units;

[0037] Taking the average current as the current reference value, comparing the current feedback signals of the n - m slave power supply units with the current reference value to obtain the current loop error amounts of the n - m slave power supply units;

[0038] Controlling the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the current loop error amounts of the n - m slave power supply units to adjust the currents of the n - m slave power supply units.

[0039] To achieve the above object, an embodiment of the present invention further provides a current sharing control device for a power supply system, including a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, the current sharing control method of the power supply system as described in the above - mentioned embodiment of the present invention is implemented.

[0040] To achieve the above object, an embodiment of the present invention further provides a power supply system, including: n power supply units connected in parallel and the current sharing control device as described in the above - mentioned embodiment of the present invention; where n is greater than 1.

[0041] Compared with the prior art, an embodiment in the above - mentioned embodiments of the present invention has the following beneficial effects:

[0042] First, collect the output currents of the n power supply units and calculate the average value of the output currents of the n power supply units to obtain the average current; second, select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as the main power supply units, and use the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1; then, perform droop current sharing control on the m main power supply units with a preset voltage value as the voltage reference value; perform current loop current sharing control on the n - m slave power supply units with the average current as the current reference value. In the embodiment of the present invention, when one of the main power supply units fails, the remaining m - 1 main power supply units perform droop current sharing control to make up for the power gap brought by the faulty main power supply unit, so that the power supply system smoothly transitions to another main power supply unit being selected, thereby reducing the power fluctuation of all power supply units caused by the failure of one power supply unit and improving the anti - interference ability of the power supply system; in addition, the remaining n - m slave power supply units perform current loop current sharing control with the average current as the current reference value, which can reduce the control complexity of most power supply units, thereby accelerating the response speed of the control loop to disturbances to improve the anti - interference ability of the power supply system. Description of the Drawings

[0043] Figure 1It is a schematic flow chart of a current sharing control method for a power supply system provided by an embodiment of the present invention;

[0044] Figure 2 It is a schematic structural diagram of a multi-power supply unit in parallel provided by an embodiment of the present invention;

[0045] Figure 3 It is a control block diagram of droop current sharing control for a main power supply unit provided by an embodiment of the present invention;

[0046] Figure 4 It is a control block diagram of current loop current sharing control for a slave power supply unit provided by an embodiment of the present invention;

[0047] Figure 5 It is a schematic structural diagram of a current sharing control device for a power supply system provided by an embodiment of the present invention;

[0048] Figure 6 It is a structural block diagram of a current sharing control device for a power supply system provided by an embodiment of the present invention. Detailed implementation manners

[0049] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described 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 of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0050] See Figure 1 , Figure 1 It is a schematic flow chart of a current sharing control method for a power supply system provided by an embodiment of the present invention.

[0051] The current sharing control method for the power supply system provided by the embodiment of the present invention, the power supply system is composed of n power supply units in parallel; where n is greater than 1; the method includes the steps:

[0052] S11. Collect the output currents of the n power supply units;

[0053] S12. Calculate the average value of the output currents of the n power supply units to obtain the average current;

[0054] S13. Select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as the main power supply units, and use the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1;

[0055] S14. Use a preset voltage value as the voltage reference value to perform droop current sharing control on the m main power supply units;

[0056] S15. Using the average current as a current reference value, perform current loop current sharing control on the nm slave power supply units.

[0057] It should be noted that see Figure 2 The current sharing control method of the power supply system provided by the present invention is aimed at Figure 2 The power supply system shown is composed of n power supply units connected in parallel, wherein each power supply unit is connected via a DC bus, each power supply unit obtains power from the DC bus and supplies power to the load at the same time.

[0058] Specifically, Among them, I avg is the average current, I max is the rated maximum output current of the power supply unit, and [] is the rounding up function.

[0059] It is worth noting that the embodiments of the present invention are Find out the minimum number of devices (m-1) required to make up for the power gap of a main power supply unit failure, so that the m main power supply units work in a dual-loop control mode for the purpose of controlling voltage, avoiding the short-term drastic fluctuations in system power and voltage caused by a main power supply unit failure. Moreover, the value of m is set only based on the most common single fault in the power supply system, and the influencing factors of low-probability events such as double or more faults are more practically abandoned, so that the current sharing control method of the power supply system of the present invention has strong robustness and stability, and will not occupy too much computing resources of the control chip.

[0060] In some more preferred embodiments, the step S14 is specifically:

[0061] Multiplying the output currents of the m main power supply units by a first proportionality coefficient to obtain current feedback signals of the m main power supply units;

[0062] Multiplying the output voltages of the m main power supply units by a second proportionality coefficient to obtain voltage feedback signals of the m main power supply units;

[0063] multiplying the current feedback signal and the voltage feedback signal of the m main power supply units to obtain output feedback signals of the m main power supply units;

[0064] Taking a preset voltage value as a voltage reference value, comparing the output feedback signals of the m main power supply units with the voltage reference value to obtain voltage error amounts of the m main power supply units;

[0065] Control the PWM controllers of the m main power supply units to perform pulse width modulation through the voltage error amounts of the m main power supply units, so as to adjust the currents of the m main power supply units.

[0066] Preferably, use a preset voltage value as the voltage reference value, compare the output feedback signals of the m main power supply units with the voltage reference value, and obtain the voltage error amounts of the m main power supply units. Specifically:

[0067] Use a preset voltage value as the voltage reference value, input the voltage reference value to the non-inverting terminals of m pre-configured first operational amplifiers, and input the output feedback signals of the m main power supply units to the inverting terminals of the m first operational amplifiers respectively, so as to compare the output feedback signals of the m main power supply units with the voltage reference value and obtain the voltage error amounts of the m main power supply units.

[0068] See Figure 3 , Figure 3 is a control block diagram of droop current sharing control of a main power supply unit provided by an embodiment. It should be noted that all m main power supply units adopt droop current sharing control. When one of the main power supply units fails, the remaining m - 1 main power supply units still maintain droop control. However, when one main power supply unit fails, the outputs of the remaining main power supply units will also be affected, and the output voltage will drop slightly. At this time, the m - 1 main power supply units are adjusted according to droop current sharing control, and the output voltage error amounts increase, so the PWM controller is adjusted to increase the output power of the power circuit, so that I O and V O increase, so that the power supply system returns to a balanced state. Then, a new main power supply unit is selected and added to the droop current sharing control again to obtain a new balanced state. In this way, it is ensured that when one main power supply unit fails, the remaining main power supply units can also complete the adjustment of output power and output voltage, so that the power supply system smoothly transitions to the moment when a new main power supply unit is selected. It is equivalent to using m - 1 intact main power supply units to work at the rated maximum output current state to make up for the power gap caused by the failure of one main power supply unit, and the remaining n - m slave power supply units can be adjusted to the established average current, thereby reducing the power fluctuation of all power supply units caused by the failure of the main power supply unit.

[0069] In a preferred embodiment, the step S15 is specifically:

[0070] Multiply the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain the current feedback signals of the n - m slave power supply units;

[0071] Taking the average current as the current reference value, comparing the current feedback signals of the n - m slave power supply units with the current reference value, and obtaining the current loop error amounts of the n - m slave power supply units;

[0072] Controlling the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the current loop error amounts of the n - m slave power supply units, so as to adjust the currents of the n - m slave power supply units.

[0073] Furthermore, the step of taking the average current as the current reference value, comparing the current feedback signals of the n - m slave power supply units with the current reference value, and obtaining the current loop error amounts of the n - m slave power supply units is specifically as follows:

[0074] Taking the average current as the current reference value, inputting the current reference value to the non - inverting terminals of n - m pre - configured second operational amplifiers, and respectively inputting the current feedback signals of the n - m slave power supply units to the inverting terminals of the n - m second operational amplifiers, so as to compare the current feedback signals of the n - m slave power supply units with the current reference value, and obtain the current loop error amounts of the n - m slave power supply units.

[0075] It should be noted that, referring to Figure 4 , Figure 4 is a control block diagram of the current loop current sharing control of a slave power supply unit provided in an embodiment of the present invention. The n - m slave power supply units perform current loop current sharing control with the average current as the current reference value. When the input voltage of the slave power supply unit drops instantaneously, if the control signal of the PWM controller remains unchanged, the output current of the slave power supply unit will decrease. And at this time, the current loop current sharing control comes into play, and will immediately adjust the PWM controller according to the current loop error amount, so as to output a normal current.

[0076] It should be noted that the response speed to disturbances is mainly examined from two aspects: on the one hand, look at the delay of the control loop starting to act in the direction of weakening the disturbance after the disturbance occurs, that is, performance A; on the other hand, look at the time to eliminate the disturbance through control, that is, performance B. Since the current sharing control of the current loop in the present invention has only one current control quantity, while in the traditional droop method, there are two control quantities for all devices, namely the output voltage and current. When considering transients, if one control quantity in the droop method is controlled, the other control quantity may not converge, resulting in a longer time to eliminate the disturbance in the traditional droop method and poor performance B. Moreover, in the traditional droop method, it is necessary to first sense the voltage drop and then adjust the voltage, and then indirectly adjust the output current, so the response speed is slow, that is, performance A is poor. In the present invention, n - m slave power supply units use the average current as the current reference value to perform current loop current sharing control on the n - m slave power supply units, rather than all devices controlling the output voltage as in the traditional droop method, which can accelerate the response speed of the control loop to disturbances, reduce the control complexity of the slave power supply units, and thus improve the reliability of the current sharing control of the power supply system.

[0077] Correspondingly, the embodiment of the present invention further provides a current sharing control device for a power supply system, which can implement all processes of the current sharing control method of the above - mentioned power supply system.

[0078] See Figure 5 , which is a schematic structural diagram of a current sharing control device for a power supply system provided by an embodiment of the present invention.

[0079] The current sharing control device for a power supply system provided by the embodiment of the present invention, the power supply system is composed of n power supply units connected in parallel; where n is greater than 1; the device includes:

[0080] A data acquisition module 21, configured to acquire the output currents of the n power supply units;

[0081] A data operation module 22, configured to calculate the average value of the output currents of the n power supply units to obtain an average current;

[0082] A unit division module 23, configured to select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as main power supply units, and use the remaining n - m power supply units as slave power supply units; where m is greater than or equal to 1;

[0083] A first current sharing control module 24, configured to perform droop current sharing control on the m main power supply units with a preset voltage value as the voltage reference value;

[0084] A second current sharing control module 25, configured to perform current loop current sharing control on the n - m slave power supply units with the average current as the current reference value.

[0085] Specifically, where I avg is the average current, I max is the rated maximum output current of the power supply unit, and [] is the ceiling function.

[0086] As one of the optional embodiments, the first current sharing control module 24 is specifically configured to:

[0087] Multiply the output currents of the m main power supply units by a first proportionality coefficient to obtain m current feedback signals of the m main power supply units;

[0088] Multiply the output voltages of the m main power supply units by a second proportionality coefficient to obtain m voltage feedback signals of the m main power supply units;

[0089] Multiply the current feedback signals and the voltage feedback signals of the m main power supply units to obtain m output feedback signals of the m main power supply units;

[0090] Use a preset voltage value as the voltage reference value, compare the output feedback signals of the m main power supply units with the voltage reference value to obtain m voltage error amounts of the m main power supply units;

[0091] Control the PWM controllers of the m main power supply units to perform pulse width modulation through the m voltage error amounts of the m main power supply units to adjust the currents of the m main power supply units.

[0092] As one of the preferred embodiments, the second current sharing control module 25 is specifically configured to:

[0093] Multiply the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain n - m current feedback signals of the n - m slave power supply units;

[0094] Use the average current as the current reference value, compare the current feedback signals of the n - m slave power supply units with the current reference value to obtain n - m current loop error amounts of the n - m slave power supply units;

[0095] Control the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the n - m current loop error amounts of the n - m slave power supply units to adjust the currents of the n - m slave power supply units.

[0096] It should be noted that the relevant specific descriptions and beneficial effects of the embodiments of the current sharing control device of the power supply system in this embodiment can refer to the relevant specific descriptions and beneficial effects of the embodiments of the current sharing control method of the power supply system above, and will not be elaborated here.

[0097] It should be noted that the device embodiments described above are merely illustrative. The units described as separate components may or may not be physically separated, and the components shown for the units may or may not be physical units, that is, they may be located in one place or distributed to multiple network units. Some or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. In addition, in the attached drawings of the device embodiments provided by the present invention, the connection relationship between the modules indicates that there is a communication connection between them, which can be specifically implemented as one or more communication buses or signal lines. Those of ordinary skill in the art can understand and implement it without creative work.

[0098] The embodiment of the present invention also provides a current sharing control device for a power supply system. Refer to Figure 6 , which is a current sharing control device for a power supply system provided by an embodiment of the present invention, including a processor 10, a memory 20, and a computer program stored in the memory 20 and configured to be executed by the processor 10. When the processor 10 executes the computer program, it implements the current sharing control method for the power supply system described in any of the above embodiments.

[0099] Preferably, the computer program can be divided into one or more modules / units (such as computer program 1, computer program 2,...). The one or more modules / units are stored in the memory 20 and executed by the processor 10 to complete the present invention. The one or more modules / units can be a series of computer program instruction segments capable of performing specific functions, and these instruction segments are used to describe the execution process of the computer program in the terminal device.

[0100] The processor 10 can be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor can be a microprocessor, or the processor 10 can also be any conventional processor. The processor 10 is the control center of the current sharing control device, and connects various parts of the terminal device through various interfaces and lines.

[0101] The memory 20 mainly includes a program storage area and a data storage area. Among them, the program storage area can store an operating system, application programs required for at least one function, etc., and the data storage area can store relevant data, etc. In addition, the memory 20 can be a high-speed random access memory, or a non-volatile memory, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) card, a Flash Card, etc., or the memory 20 can also be other volatile solid-state storage devices.

[0102] It should be noted that the current sharing control device of the above power supply system may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that Figure 6 The structural block diagram is only an example of the current sharing control device, and does not constitute a limitation on the current sharing control device. It may include more or fewer components than shown in the figure, or combine some components, or different components.

[0103] Correspondingly, an embodiment of the present invention further provides a power supply system, including: n power supply units connected in parallel and the current sharing control device described in any of the above embodiments; where n is greater than 1.

[0104] In summary, for the current sharing control method, device, equipment and system of a power supply system provided by the embodiments of the present invention, first, collect the output currents of the n power supply units, and calculate the average value of the output currents of the n power supply units to obtain an average current; secondly, select m power supply units with the largest difference in output current from the n power supply units compared with the average current as the main power supply units, and use the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1; then, use a preset voltage value as the voltage reference value to perform droop current sharing control on the m main power supply units; use the average current as the current reference value to perform current loop current sharing control on the n - m slave power supply units. In the embodiments of the present invention, when one of the main power supply units fails, the remaining m - 1 main power supply units perform droop current sharing control to make up for the power gap caused by the faulty main power supply unit, so that the power supply system can smoothly transition to another main power supply unit being selected, thereby reducing the power fluctuation of all power supply units caused by the failure of one power supply unit and improving the anti-interference ability of the power supply system; in addition, the remaining n - m slave power supply units perform current loop current sharing control with the average current as the current reference value, which can reduce the control complexity of most power supply units, thereby accelerating the response speed of the control loop to disturbances and improving the anti-interference ability of the power supply system.

[0105] The above are the preferred embodiments of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present invention, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present invention.

Claims

1. A current sharing control method for a power supply system, characterized in that The power supply system is composed of n power supply units connected in parallel; where n is greater than 1; the method includes: Collect the output currents of the n power supply units; Calculate the average value of the output currents of the n power supply units to obtain the average current; Select m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as the main power supply units, and use the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1; Use a preset voltage value as the voltage reference value to perform droop current sharing control on the m main power supply units; Use the average current as the current reference value to perform current loop current sharing control on the n - m slave power supply units.

2. The current sharing control method for the power supply system according to claim 1, characterized in that, ; where, I avg is the average current, I max is the rated maximum output current of the power supply unit, and [ ] is the ceiling function.

3. The current sharing control method of the power supply system according to claim 1, characterized in that The step of using a preset voltage value as the voltage reference value to perform droop current sharing control on the m main power supply units is specifically: Multiply the output currents of the m main power supply units by a first proportionality coefficient to obtain the current feedback signals of the m main power supply units; Multiply the output voltages of the m main power supply units by a second proportionality coefficient to obtain the voltage feedback signals of the m main power supply units; Multiply the current feedback signals and the voltage feedback signals of the m main power supply units to obtain the output feedback signals of the m main power supply units; Use a preset voltage value as the voltage reference value to compare the output feedback signals of the m main power supply units with the voltage reference value to obtain the voltage error amounts of the m main power supply units; Control the PWM controllers of the m main power supply units to perform pulse width modulation through the voltage error amounts of the m main power supply units to adjust the currents of the m main power supply units.

4. The current sharing control method of the power supply system according to claim 1, characterized in that, The step of using the average current as the current reference value to perform current loop current sharing control on the n - m slave power supply units is specifically: Multiply the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain the current feedback signals of the n - m slave power supply units; Use the average current as the current reference value to compare the current feedback signals of the n - m slave power supply units with the current reference value to obtain the current loop error amounts of the n - m slave power supply units; Control the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the current loop error amounts of the n - m slave power supply units to adjust the currents of the n - m slave power supply units.

5. A current sharing control device for a power supply system, characterized in that The power supply system is composed of n power supply units connected in parallel; where n is greater than 1; the device includes: A data acquisition module for collecting the output currents of the n power supply units; A data operation module for calculating the average value of the output currents of the n power supply units to obtain the average current; A unit division module for selecting m power supply units with the largest numerical difference between the output current and the average current from the n power supply units as the main power supply units, and using the remaining n - m power supply units as the slave power supply units; where m is greater than or equal to 1; A first current sharing control module for using a preset voltage value as the voltage reference value to perform droop current sharing control on the m main power supply units; The second current sharing control module is used to perform current loop current sharing control on n - m of the slave power supply units with the average current as the current reference value.

6. The current sharing control device of the power supply system according to claim 5, characterized in that Wherein, ; I avg is the average current, I max is the rated maximum output current of the power supply unit, and [ ] is the ceiling function.

7. The current sharing control device of the power supply system according to claim 5, wherein The first current sharing control module is specifically used for: Multiplying the output currents of the m main power supply units by a first proportionality coefficient to obtain current feedback signals of the m main power supply units; Multiplying the output voltages of the m main power supply units by a second proportionality coefficient to obtain voltage feedback signals of the m main power supply units; Multiplying the current feedback signals and the voltage feedback signals of the m main power supply units to obtain output feedback signals of the m main power supply units; Comparing the output feedback signals of the m main power supply units with a preset voltage value as the voltage reference value to obtain voltage error amounts of the m main power supply units; Controlling the PWM controllers of the m main power supply units to perform pulse width modulation through the voltage error amounts of the m main power supply units to regulate the currents of the m main power supply units.

8. The current sharing control device of the power supply system according to claim 5, characterized in that, The second current sharing control module is specifically used for: Multiplying the output currents of the n - m slave power supply units by a third proportionality coefficient to obtain current feedback signals of the n - m slave power supply units; Comparing the current feedback signals of the n - m slave power supply units with the average current as the current reference value to obtain current loop error amounts of the n - m slave power supply units; Controlling the PWM controllers of the n - m slave power supply units to perform pulse width modulation through the current loop error amounts of the n - m slave power supply units to regulate the currents of the n - m slave power supply units.

9. A current sharing control device for a power supply system, characterized in that, It includes a processor, a memory, and a computer program stored in the memory and configured to be executed by the processor. When the processor executes the computer program, it implements the current sharing control method of the power supply system according to any one of claims 1 to 4.

10. A power supply system, characterized in that, It includes: n power supply units connected in parallel and the current sharing control device according to claim 9 above; wherein, n is greater than 1.

Images