Power supply system, control method of power supply system, and electronic device

Abstract

The present application discloses a power supply system, a control method for the power supply system, and an electronic device, belonging to the technical field of power supply. The power supply system includes: at least two power supply devices connected in parallel; a first controller, the first controller being connected to the at least two power supply devices; the first controller is configured to determine a first power control parameter of the power supply system based on the grid connection point power of the power supply system accessing the power grid, and send the first power control parameter to the at least two power supply devices; the power supply device is configured to determine a second power control parameter of the power supply device based on the first power control parameter and the device capacity information of the power supply device itself, and perform power control based on the second power control parameter. The power supply system can improve the control stability in the hybrid connection scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

Description

Technical Field

[0001] The present application belongs to the field of power supply technology, and in particular, relates to a power supply system, a control method of a power supply system, and an electronic device. Background Art

[0002] There are many types of inverters on the market, including but not limited to single-phase, three-phase three-wire, three-phase four-wire and other output modes, which can be used as power supply equipment to cooperate with photovoltaics and energy storage to form a renewable energy system and be integrated into the power grid. Among them, single-phase and three-phase three-wire inverters have the characteristics of low price and simple control, and have been widely used in various systems. Three-phase four-wire inverters can effectively control zero-sequence components and have the ability to drive unbalanced loads, and are also used in various systems.

[0003] There are certain differences in the control methods supported by inverters with different output modes. When multiple types of inverters are mixed to form a power supply system, the system's energy scheduling is complex and control instability is prone to occur. It is impossible to take into account the inherent control characteristics of various inverters, and it is difficult to achieve compatibility between the economy and compliance of the power supply system in a mixed scenario. Summary of the invention

[0004] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes a power supply system, a control method of the power supply system and an electronic device, which can improve the control stability of the hybrid scene, take into account the control characteristics of various power supply devices, and achieve compatibility between economy and compliance.

[0005] In a first aspect, the present application provides a power supply system, comprising:

[0006] At least two power supply devices connected in parallel;

[0007] A first controller, the first controller is connected to the at least two power supply devices;

[0008] The first controller is used to determine a first power control parameter of the power supply system based on the power of the grid connection point where the power supply system is connected to the power grid, and send the first power control parameter to the at least two power supply devices;

[0009] The power supply device is used to determine a second power control parameter of the power supply device based on the first power control parameter and device capacity information of the power supply device itself, and perform power control based on the second power control parameter.

[0010] According to the power supply system of the present application, the first controller performs macroscopic power allocation according to the grid connection point power. Based on the first power control parameters issued by the first controller, each power supply device performs local adaptive adjustment according to its own device capacity information, which can improve the control stability in the hybrid connection scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

[0011] According to an embodiment of the present application, the power supply system is connected to an energy storage system. The energy storage system includes at least one energy storage device. The first controller is configured to determine a state of charge balance reference value based on the current energy storage power and the current charge and discharge capacity of the energy storage system, and send the state of charge balance reference value to the at least two power supply devices;

[0012] The power supply device is connected to the energy storage device. The power supply device is configured to determine a first balance power amount based on the rated energy storage capacity, the current state of charge of the energy storage device, and the state of charge balance reference value, and adjust the second power control parameter based on the first balance power amount.

[0013] According to an embodiment of the present application, the first controller is configured to determine the current charge and discharge capacity of the energy storage system based on the rated energy storage capacity and the current state of charge of the energy storage system;

[0014] Alternatively, the first controller is configured to determine the current charge and discharge capacity of the energy storage system based on the current charge and discharge capacity of each energy storage device.

[0015] According to an embodiment of the present application, the power supply system is connected to a power generation system. The power generation system includes at least one power generation device. The power supply device is connected to the power generation device. The power supply device is configured to determine a second balance power amount based on the current power generation state of the power generation device, and adjust the second power control parameter based on the second balance power amount.

[0016] According to an embodiment of the present application, the power supply device is a single-phase power supply device. The power supply device is configured to determine the second power control parameter corresponding to the connection of the power supply device based on the first power control parameter corresponding to the connection of the power supply device and the device capacity information of the power supply device itself.

[0017] According to an embodiment of the present application, the power supply device is a three-phase three-wire power supply device. The power supply device is configured to determine three third power control parameters based on the first power control parameter and the device capacity information of the power supply device itself, and determine the second power control parameter based on the three third power control parameters. Each third power control parameter corresponds to one connection phase of the power supply device.

[0018] According to an embodiment of the present application, the power supply device is configured to use the minimum value among the three third power control parameters as the second power control parameter.

[0019] According to an embodiment of the present application, the power supply device is configured to use the average value of the three third power control parameters as the second power control parameter.

[0020] According to an embodiment of the present application, the power supply device is a three-phase four-wire power supply device, and the power supply device is configured to determine the second power control parameter of the power supply device based on the first power control parameter and the device capacity information of the power supply device itself.

[0021] According to an embodiment of the present application, the first controller is configured to determine a first target power corresponding to the power supply system under load based on the grid connection point power, and determine the first power control parameter based on the rated capacity information of the power supply system and the first target power.

[0022] According to an embodiment of the present application, the first controller is a control unit on the power supply device or an external controller independent of each power supply device.

[0023] In a second aspect, the present application provides a control method for a power supply system. The power supply system includes a first controller and at least two power supply devices connected in parallel. The first controller is connected to the at least two power supply devices. The method is applied to the first controller and includes:

[0024] Obtain the grid connection point power of the power supply system accessing the power grid;

[0025] Determine a first power control parameter of the power supply system based on the grid connection point power;

[0026] Send the first power control parameter to the at least two power supply devices, so that the power supply device determines the second power control parameter of the power supply device based on the first power control parameter and the device capacity information of the power supply device itself, and performs power control based on the second power control parameter.

[0027] According to the control method of the power supply system of the present application, through the first controller for macroscopic power allocation according to the grid connection point power, each power supply device performs local adaptive adjustment based on its own device capacity information on the basis of the first power control parameter issued by the first controller, which can improve the control stability in the mixed connection scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

[0028] According to an embodiment of the present application, the power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, and the method further includes:

[0029] Based on the current energy storage power and the current charge and discharge capacity of the energy storage system, determine the state of charge balance reference value;

[0030] Send the state of charge balance reference value to the at least two power supply devices, so that the power supply device connected to the energy storage device determines a first balance power amount based on the rated energy storage capacity, the current state of charge of the energy storage device, and the state of charge balance reference value, and adjusts the second power control parameter based on the first balance power amount.

[0031] According to an embodiment of the present application, the determining the first power control parameter of the power supply system based on the grid connection point power includes:

[0032] Based on the grid connection point power, determine the first target power corresponding to the power supply system under load;

[0033] Based on the rated capacity information of the power supply system and the first target power, determine the first power control parameter.

[0034] In a third aspect, the present application provides a control method for a power supply system,

[0035] The power supply system includes a first controller and at least two power supply devices connected in parallel, the first controller is connected to the at least two power supply devices, the method is applied to the power supply device, and the method includes:

[0036] Receive the first power control parameter sent by the first controller, the first power control parameter is determined based on the grid connection point power of the power supply system accessing the power grid;

[0037] Based on the first power control parameter and the device capacity information of the power supply device itself, determine the second power control parameter of the power supply device;

[0038] Perform power control based on the second power control parameter.

[0039] According to the control method of the power supply system of the present application, the first controller performs macroscopic power allocation according to the grid connection point power. Based on the first power control parameter issued by the first controller, the power supply device performs local adaptive adjustment according to its own device capacity information, which can improve the control stability in the mixed connection scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

[0040] According to an embodiment of the present application, the power supply device is a single-phase power supply device, and the second power control parameter is determined through the following steps:

[0041] Based on the corresponding first power control parameter accessed by the power supply device and the device capacity information of the power supply device itself, determine the corresponding second power control parameter accessed by the power supply device.

[0042] According to an embodiment of the present application, the power supply device is a three-phase three-wire power supply device, and the second power control parameter is determined through the following steps:

[0043] Based on the first power control parameter and the device capacity information of the power supply device itself, determine three third power control parameters, each of the third power control parameters corresponding to one access phase of the power supply device;

[0044] Based on the three third power control parameters, determine the second power control parameter.

[0045] According to an embodiment of the present application, the determining the second power control parameter based on the three third power control parameters includes:

[0046] Take the minimum value of the three third power control parameters as the second power control parameter.

[0047] According to an embodiment of the present application, the power supply device is a three-phase four-wire power supply device, and the second power control parameter is determined through the following steps:

[0048] Based on the first power control parameter and the device capacity information of the power supply device itself, determine the corresponding second power control parameter of the power supply device.

[0049] According to an embodiment of the present application, the power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, the power supply device is connected to the energy storage device, and before performing power control based on the second power control parameter, the method further includes:

[0050] Receive the state of charge balance reference value sent by the first controller, and the state of charge balance reference value is determined based on the current energy storage power and the current charge and discharge capacity of the energy storage system;

[0051] Based on the rated energy storage capacity, the current state of charge of the energy storage device and the state of charge balance reference value, determine the first balance power amount;

[0052] Adjust the second power control parameter based on the first balance power amount.

[0053] According to an embodiment of the present application, the power supply system is connected to a power generation system, the power generation system includes at least one power generation device, the power supply device is connected to the power generation device, and before performing power control based on the second power control parameter, the method further includes:

[0054] Determine a second balanced power amount based on the current power generation state of the power generation device;

[0055] Adjust the second power control parameter based on the second balanced power amount.

[0056] In a fourth aspect, the present application provides an electronic device, including a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, it implements the control method of the power supply system as described in the second aspect or the third aspect above.

[0057] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements the control method of the power supply system as described in the second aspect or the third aspect above.

[0058] In a sixth aspect, the present application provides a computer program product, including a computer program. When the computer program is executed by a processor, it implements the control method of the power supply system as described in the second aspect or the third aspect above.

[0059] The additional aspects and advantages of the present application will be partially given in the following description, partially become obvious from the following description, or be understood through the practice of the present application. Description of the Drawings

[0060] The above and / or additional aspects and advantages of the present application will become obvious and easy to understand from the description of the embodiments in conjunction with the following drawings, where:

[0061] Figure 1 is one of the schematic structural diagrams of the power supply system provided by the embodiment of the present application;

[0062] Figure 2 is another schematic structural diagram of the power supply system provided by the embodiment of the present application;

[0063] Figure 3 is the schematic flowchart of the power scheduling performed by the first controller provided by the embodiment of the present application;

[0064] Figure 4 is the schematic flowchart of the power scheduling performed by the power supply device for single-phase power supply provided by the embodiment of the present application;

[0065] Figure 5It is a schematic flowchart of power scheduling for a power supply device with three-phase three-wire power supply provided by an embodiment of the present application;

[0066] Figure 6 It is a schematic flowchart of power scheduling for a power supply device with three-phase four-wire power supply provided by an embodiment of the present application;

[0067] Figure 7 It is one of the schematic flowcharts of the control method for a power supply system provided by an embodiment of the present application;

[0068] Figure 8 It is another schematic flowchart of the control method for a power supply system provided by an embodiment of the present application;

[0069] Figure 9 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application.

[0070] Reference numerals:

[0071] The first controller 110, the power supply device 120, the DC device 130, the load 140, the power grid 150. Detailed implementation manners

[0072] Next, the technical solutions in the embodiments of the present application will be clearly described in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art belong to the scope of protection of the present application.

[0073] The terms "first", "second", etc. in the description and claims of the present application are used to distinguish similar objects, rather than to describe a specific order or sequence. It should be understood that such data can be interchanged under appropriate circumstances so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of the same category, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the description and claims means at least one of the connected objects, and the character " / " generally represents an "or" relationship between the associated objects before and after.

[0074] Next, the power supply system, the control method of the power supply system, the electronic device, and the readable storage medium provided by the embodiments of the present application will be described in detail in conjunction with the accompanying drawings through specific embodiments and their application scenarios.

[0075] As Figure 1 shown, the power supply system of the embodiment of the present application includes: at least two power supply devices 120 and a first controller 110 connected in parallel, and the first controller 110 is connected to the at least two power supply devices 120.

[0076] Among them, the power supply device 120 may include a conversion circuit for realizing power conversion between DC voltage and AC voltage. The power supply device 120 may be devices such as an inverter and a current converter.

[0077] One end of the power supply device 120 is connected to the DC device 130. Multiple power supply devices 120 are connected in parallel, and the formed power supply system can be connected to the power grid 150.

[0078] Among them, the DC device 130 is a device connected to the DC side of the power supply device 120, including but not limited to photovoltaic power generation devices, energy storage devices, photovoltaic and energy storage devices (photovoltaic and energy storage), etc.

[0079] It should be noted that the power supply system includes two or more power supply devices 120. The types of the power supply devices 120 can be different, including but not limited to power supply devices 120 with output modes such as single-phase, three-phase three-wire, and three-phase four-wire.

[0080] As Figure 1 shown, the power supply system includes multiple power supply devices 120, including single-phase power supply devices, three-phase three-wire power supply devices, and three-phase three-wire power supply devices, forming a mixed connection scenario of the power supply system.

[0081] The first controller 110 is a device for performing tasks such as monitoring and control in the power supply system. The first controller 110 can be communicatively connected or electrically connected to at least two power supply devices 120 of the power supply system, monitor the operating states of each power supply device 120, and output control instructions to each power supply device 120 to control the power supply device 120 to perform corresponding actions and coordinate the operation of the power supply system.

[0082] It can be understood that the power supply system can be connected to the power grid 150 to transmit electric energy to the power grid 150, or cut off power from the power grid 150. The first controller 110 can monitor the connection point state of the power supply system connected to the power grid 150.

[0083] In this embodiment, the first controller 110 is used to determine the first power control parameter of the power supply system based on the connection point power of the power supply system connected to the power grid 150, and send the first power control parameter to at least two power supply devices 120.

[0084] It should be noted that the power information at the connection point where the power supply system is connected to the power grid 150 reflects the power flow situation between the power supply system and the power grid 150. Through the connection point power of the power supply system connected to the power grid 150, the power information that the power supply system needs to adjust can be obtained. By determining the first power control parameter through the connection point power for control, the stability and balance at the connection point can be maintained.

[0085] It can be understood that the power grid 150 can adopt three-phase power, having a phase A, a phase B, and a phase C. The power at the grid connection point where the power supply system is connected to the power grid 150 can be the total power at the grid connection point, or can be the power at the grid connection points of each phase where the power supply system is connected to the power grid 150, and can include the power corresponding to each of the phase A, phase B, and phase C at the grid connection point.

[0086] In some embodiments, the first controller 110 determines a first power control parameter of the power supply system according to the total power at the grid connection point, and sends the first power control parameter to each power supply device 120 of the power supply system.

[0087] In some other embodiments, the first controller 110 determines the first power control parameters corresponding to each of the phase A, phase B, and phase C in the power supply system according to the power corresponding to each of the phase A, phase B, and phase C at the grid connection point, and sends these first power control parameters to each power supply device 120 of the power supply system.

[0088] The power supply device 120 is configured to determine a second power control parameter of the power supply device 120 based on the first power control parameter and the device capacity information of the power supply device 120 itself, and perform power control based on the second power control parameter.

[0089] In this embodiment, when the power supply device 120 receives the first power control parameters of each phase sent by the first controller 110, it determines the second power control parameters of each phase of the power supply device 120 according to the first power control parameters of each phase and the device capacity information of the power supply device 120 itself, and performs its own power control according to the second power control parameters of each phase.

[0090] It should be noted that the first power control parameters sent by the first controller 110 to each power supply device 120 are the same. The information such as the type, rated power, and rated capacity of each power supply device 120 is different. The second power control parameters determined by each power supply device 120 according to its own device capacity information and the first power control parameter can be different. When performing power control through the second power control parameter, it can adapt to the inherent characteristics of each power supply device 120 itself.

[0091] In the related art, in order to avoid control instability, most choose to avoid the occurrence of mixed connection situations, or perform simple power distribution according to the inverter model or a single control target. The distribution result is often not the optimal operating state in this application scenario, resulting in waste of some available capacity, or inability to maintain the capacity balance between devices, and it is difficult to achieve the compatibility of the system in terms of economy and compliance.

[0092] In the embodiment of the present application, the first controller 110 performs macroscopic power allocation according to the grid connection point power. Based on the first power control parameters issued by the first controller 110, each power supply device 120 performs local adaptive adjustment according to its own device capacity information, supports power distribution in single-phase, three-phase three-wire, and three-phase four-wire mixed connection scenarios, takes the power flow situation at the grid connection point as the control basis, and takes into account the differences in output capabilities among the power supply devices 120. Each power supply device 120 calculates independently, and can also realize the control of the power of each phase, is applicable to power allocation under various loads 140, prevents the situation of unstable control of the power supply system, can take into account the control characteristics of various power supply devices 120, and realizes the compatibility of economy and compliance.

[0093] According to the power supply system provided by the embodiment of the present application, the first controller 110 performs macroscopic power allocation according to the grid connection point power. Based on the first power control parameters issued by the first controller 110, each power supply device 120 performs local adaptive adjustment according to its own device capacity information, which can improve the control stability of the mixed connection scenario, take into account the control characteristics of various power supply devices 120, and realize the compatibility of economy and compliance.

[0094] In some embodiments, the first controller 110 is used to determine a first target power corresponding to the load carried by the power supply system based on the grid connection point power, and determine the first power control parameters based on the rated capacity information of the power supply system and the first target power.

[0095] Among them, the first target power is the power target value for the power supply system to perform power adjustment to meet the operation of the load 140 connected to the power supply system.

[0096] In actual execution, when the first controller 110 obtains the grid connection point power of each phase of the power supply system connected to the power grid 150, the first controller 110 can determine the first target power of each phase corresponding to the load carried by the power supply system based on the grid connection point power of each phase, and determine the first power control parameters of each phase based on the rated capacity information of each phase of the power supply system and the first target power.

[0097] In actual execution, the rated capacity information of each phase of the power supply system can be obtained by summing the rated capacities of each phase of each power supply device 120 in the power supply system.

[0098] In this embodiment, based on the current grid connection point power, with the goal of achieving an equilibrium state of load 140 power consumption and device power generation (the grid connection point power is controlled to 0), the first target power for the power supply system to operate with load is obtained, and combined with the rated capacity information of the power supply system, the first power control parameters are determined.

[0099] Take the example where the first controller 110 obtains the grid connection point power of each phase of the power supply system connected to the power grid 150.

[0100] For example, the rated capacity information of phase A, phase B, and phase C in the power supply system is Pa_inv_all, Pb_inv_all, and Pc_inv_all respectively. The first controller 110 obtains the grid connection point power of each phase currently, and calculates the first target power P1a, P1b, and P1c of phase A, phase B, and phase C respectively for each phase.

[0101] It can be understood that the power values such as the grid connection point power and the first target power of each phase can be positive or negative. A positive power value indicates feeding power to the power grid 150, and a negative power value indicates powering down from the power grid 150.

[0102] Perform per-unit conversion on the corresponding first target power according to the rated capacity information of each phase of the power supply system to obtain the first power control parameters P1a_pu = P1a / Pa_inv_all, P1b_pu = P1b / Pb_inv_all, and P1c_pu = P1c / Pc_inv_all of phase A, phase B, and phase C respectively.

[0103] It should be noted that for a power supply system with various power supply devices 120 connected in a mixed manner, calculate the rated capacity information corresponding to each phase separately. When the power supply system includes a single-phase power supply device 120 connected to a certain phase, the rated capacity information of each phase of the power supply system may be different. Determining the first power control parameter through the rated capacity information of each phase of the power supply system can take into account different types of power supply devices 120 in the mixed connection scenario.

[0104] In some embodiments, the power supply system is connected to an energy storage system. The energy storage system includes at least one energy storage device. The first controller 110 is configured to determine a state of charge balance reference value based on the current energy storage power and the current charge and discharge capacity of the energy storage system, and send the state of charge balance reference value to at least two power supply devices 120;

[0105] The power supply device 120 is connected to the energy storage device. The power supply device 120 is configured to determine a first balanced power amount based on the energy storage rated capacity, the current state of charge, and the state of charge balance reference value of the energy storage device, and adjust the second power control parameter based on the first balanced power amount.

[0106] Among them, the current energy storage power of the energy storage system is the rate of current charge and discharge energy of each energy storage device in the energy storage system. The current energy storage power is related to the current total charge and discharge state of the energy storage system; the current charge and discharge capacity of the energy storage system is the current rechargeable power or the current dischargeable power of the energy storage system.

[0107] In this embodiment, the first controller 110 calculates the state of charge balance reference value of the power supply system according to the current energy storage power and the current charge and discharge capacity of the energy storage system, and performs macro balance control.

[0108] Among them, the current charge and discharge capacity of the energy storage system can be calculated through at least the following two methods.

[0109] In some embodiments, the first controller 110 is configured to determine the current charge and discharge capacity of the energy storage system based on the rated energy storage capacity and the current state of charge of the energy storage system.

[0110] In this embodiment, by calculating according to the total rated energy storage capacity and the total current state of charge of the energy storage system, the current charge and discharge capacity of the energy storage system can be obtained.

[0111] For example, the energy storage system has n energy storage devices, Cn represents the rated energy storage capacity of the nth energy storage device, and SOCn represents the current state of charge of the nth energy storage device.

[0112] The total rated energy storage capacity of the energy storage system Call = C1 + C2 + C3 +... + Cn, and the total current state of charge SOCall = (C1 * SOC1 + C2 * SOC2 + C3 * SOC3 +... + Cn * SOCn) / Call is obtained by weighted average calculation.

[0113] When the energy storage system is in the discharge state, the current charge and discharge capacity Cavail of the energy storage system = Call * SOCall; when the energy storage system is in the charge state, the current charge and discharge capacity Cavail of the energy storage system = Call * (1 - SOCall).

[0114] In some embodiments, the first controller 110 is configured to determine the current charge and discharge capacity of the energy storage system based on the current charge and discharge capacity of each energy storage device.

[0115] In this embodiment, first, according to the rated energy storage capacity and the current state of charge of the energy storage device, the current charge and discharge capacity of the energy storage device itself is calculated, and the current charge and discharge capacities of each energy storage device in the energy storage system are summed to calculate the current charge and discharge capacity of the energy storage system.

[0116] For example, the energy storage system has n energy storage devices, Cn represents the rated energy storage capacity of the nth energy storage device, and SOCn represents the current state of charge of the nth energy storage device.

[0117] The current charge and discharge capacity of each energy storage device is calculated separately. For the nth energy storage device, when it is in the charge state, the current charge and discharge capacity Cavail_n = Cn * (1 - SOCn); when it is in the discharge state, the current charge and discharge capacity Cavail_n = Cn * SOCn.

[0118] Sum up the current charge and discharge capacities of n energy storage devices in the energy storage system, and the current charge and discharge capacity Cavail of the energy storage system can be calculated as Cavail = Cavail_1 + Cavail_2 + Cavail_3 +... + Cavail_n.

[0119] In actual implementation, after obtaining the current charge and discharge capacity of the energy storage system, the following formula can be used:

[0120] Bsoc = Pbat / Cavail

[0121] Calculate the state of charge (SOC) balance reference value of the power supply system, where Bsoc is the SOC balance reference value, Pbat is the current energy storage power of the energy storage system, and Cavail is the current charge and discharge capacity of the energy storage system.

[0122] Among them, the SOC balance reference value can be positive or negative. When the SOC balance reference value is positive, it represents the discharge capacity reference for balance control. When the SOC balance reference value is negative, it represents the charge capacity reference for balance control.

[0123] In this embodiment, the power supply device 120 connected to the energy storage device receives the SOC balance reference value. The power supply device 120 performs local adaptive adjustment according to the rated energy storage capacity, current state of charge of the connected energy storage device, and the received SOC balance reference value to obtain the first balance power amount, and adjusts the second power control parameter through the first balance power amount to cooperate with the energy storage device for its own power control.

[0124] In actual implementation, the power supply device 120 can calculate the current charge and discharge capacity of the energy storage device according to the rated energy storage capacity and current state of charge of the connected energy storage device, and calculate the first balance power amount in combination with the SOC balance reference value.

[0125] When the energy storage device is in the charging state, the current charge and discharge capacity Cavail_local of the energy storage device = Clocal * (1 - SOClocal). When the energy storage device is in the discharging state, the current charge and discharge capacity Cavail_local of the energy storage device = Clocal * SOClocal, where Clocal is the rated energy storage capacity of the energy storage device and SOClocal is the current state of charge of the energy storage device.

[0126] It should be noted that the first balance power amount is the power amount for energy storage balance adjustment. When the power supply device 120 is not connected to the energy storage device, the power supply device 120 does not need to calculate the first balance power amount.

[0127] In actual implementation, the expected charge-discharge power of energy storage regulation can be calculated according to the current charge-discharge capacity and the state-of-charge equilibrium reference value of the energy storage device connected to the power supply device 120. Based on the expected charge-discharge power, the first equilibrium power quantity is determined, the second power control parameter is adjusted, and self-power control is performed.

[0128] For example, the current charge-discharge capacity of the energy storage device connected to the power supply device 120 is Cavail_local, and the state-of-charge equilibrium reference value is Bsoc. The expected charge-discharge power Pbat_ref = Cavail_local * Bsoc.

[0129] In this embodiment, the first equilibrium power quantity ΔP1 is calculated according to the PID algorithm. By continuously adjusting the output, the feedback signal of the charge-discharge power reaches the expected value Pbat_ref.

[0130] It should be noted that the state-of-charge equilibrium reference value and the first power control parameter are control parameters for the first controller 110 to perform macroscopic regulation according to the overall state of the power supply system. They are sent to each power supply device 120, and each power supply device 120 performs local adaptive adjustment according to its own device conditions. Among them, the state-of-charge equilibrium reference value and the first power control parameter can be expressed in the form of proportional coefficients or other forms.

[0131] A specific embodiment is introduced below.

[0132] As Figure 3 shown, the first controller 110 obtains information such as the power of each phase connection point, the rated capacity information, the current energy storage power, and the energy storage rated capacity.

[0133] The first controller 110 calculates the first target power P1a, P1b, P1c of each phase according to the power of each phase connection point. Combining the rated capacity information of the power supply system, the first power control parameters P1a_pu, P1b_pu, P1c_pu of each phase can be calculated.

[0134] The state-of-charge equilibrium reference value Bsoc is calculated according to the current energy storage power Pbat and the current charge-discharge capacity Cavail.

[0135] In this embodiment, the first controller 110 sends the control parameters P1a_pu, P1b_pu, P1c_pu, Bsoc for macroscopic regulation to each power supply device 120.

[0136] In some embodiments, the power supply system is connected to a power generation system. The power generation system includes at least one power generation device. The power supply device 120 is connected to the power generation device. The power supply device 120 is configured to determine a second equilibrium power quantity based on the current power generation state of the power generation device and adjust a second power control parameter based on the second equilibrium power quantity.

[0137] In this embodiment, for the power supply device 120 connected to the power generation device, after receiving the second power control parameter, the power supply device 120 can perform local adaptive adjustment according to the current power generation state of the power generation device to which it is connected, obtain the second balanced power amount, adjust the second power control parameter through the second balanced power amount, and cooperate with the power generation device to perform its own power control.

[0138] It should be noted that the second balanced power amount can effectively utilize the surplus power of the power generation device, that is, the remaining power generation power. The second balanced power amount can be positively correlated with the remaining power generation power of the power generation device, and the remaining power generation power can be determined according to the current power generation state of the power generation device.

[0139] It can be understood that the remaining power generation power is the remaining power generation electrical energy of the power generation device on the premise of meeting the power consumption of the load 140 (when connected to the load 140) and energy storage charging (when connected to the energy storage device), that is, the power amount that needs to be adjusted by the power supply device 120.

[0140] In actual implementation, the power generation device can adopt maximum power point tracking control. According to the maximum power point tracking state, the corresponding remaining power generation power can be predicted. Through the remaining power generation power, the second balanced power amount is calculated, and the second power control parameter is adjusted through the second balanced power amount, so as to output or absorb the remaining power generation power, improving the power generation utilization rate.

[0141] It can be understood that for the power supply device 120 connected to the energy storage device, the first balanced power amount is calculated according to the state of charge balance reference value, and the second power control parameter is adjusted; for the power supply device 120 connected to the power generation device, the second balanced power amount is calculated, and the second power control parameter is adjusted; for the power supply device 120 connected to the energy storage device and the power generation device, the first balanced power amount and the second balanced power amount are calculated, and the second power control parameter is adjusted.

[0142] The power supply system of the embodiments of the present application can support power distribution in single-phase, three-phase three-wire, and three-phase four-wire mixed connection scenarios. The following specifically describes the embodiments of the present application by performing power control on the power supply device 120 of single-phase, three-phase three-wire, and three-phase four-wire respectively.

[0143] In some embodiments, the power supply device 120 is a single-phase power supply device, and the power supply device 120 is used to determine the corresponding second power control parameter accessed by the power supply device 120 based on the corresponding first power control parameter accessed by the power supply device 120 and the device capacity information of the power supply device 120 itself.

[0144] In this embodiment, the power supply device 120 with single-phase power supply determines the phase it is connected to, obtains the first power control parameter corresponding to the phase it is connected to from the received first power control parameters, combines the device capacity information of the power supply device 120 itself, obtains the second power control parameter corresponding to the connected phase, and performs power control.

[0145] For example, if the phase connected by the power supply device 120 with single-phase power supply is phase A, the power supply device 120 obtains the first power control parameter P1a_pu corresponding to phase A. According to the device capacity information Pa_inv_local of the power supply device 120 itself, the calculated second power control parameter is P1_local = P1a_pu * Pa_inv_local.

[0146] A specific embodiment is introduced below.

[0147] As Figure 4 shown, the power supply device 120 with single-phase power supply determines the phase it is connected to, and calculates the second power control parameter P1_local of the corresponding phase according to the device capacity information of itself.

[0148] Calculate the first equalization power quantity ΔP1 according to the state of charge equalization reference value Bsoc and its own energy storage state, calculate the second equalization power quantity ΔP2 according to its own power generation state, add them as adjustment quantities to P1_local, and obtain the final parameter P = P1_local + ΔP1 + ΔP2 for power control.

[0149] In some embodiments, the power supply device 120 is a device with three-phase three-wire power supply. The power supply device 120 is used to determine three third power control parameters based on the first power control parameter and the device capacity information of the power supply device 120 itself, and determine the second power control parameter based on the three third power control parameters. Each third power control parameter corresponds to one of the connected phases of the power supply device 120.

[0150] In this embodiment, for the power supply device 120 with three-phase three-wire power supply, according to the first power control parameter issued by the first controller 110 and combined with its own device capacity information, three third power control parameters (corresponding to the three connected phases of the power supply device 120) can be calculated. According to these three third power control parameters, a second power control parameter of the power supply device 120 is determined, and the power supply device 120 is power-controlled through this second power control parameter.

[0151] It should be noted that for the power supply device 120 with three-phase three-wire power supply, its device capacity information may include the rated capacities corresponding to the three connected phases, and the rated capacities of each connected phase may be equal.

[0152] For example, the rated capacities of the power supply device 120 connected to phase A, phase B, and phase C are Pa_inv_local, Pb_inv_local, and Pc_inv_local respectively, and the power supply device 120 receives P1a_pu, P1b_pu, and P1c_pu issued by the first controller 110.

[0153] According to the corresponding relationship of the connected phases, calculate the third power control parameters of the power supply device 120 connected to phase A, phase B, and phase C, which are respectively:

[0154] P1a_local = P1a_pu * Pa_inv_local;

[0155] P1b_local = P1b_pu * Pb_inv_local;

[0156] P1c_local = P1c_pu * Pc_inv_local.

[0157] In this embodiment, according to P1a_local, P1b_local, and P1c_local, calculate the second power control parameter P1_local of the power supply device 120.

[0158] In actual execution, the second power control parameter of the power supply device 120 can be obtained by taking the minimum, maximum, or average value of the three third power control parameters.

[0159] It should be noted that when the first controller 110 calculates the first power control parameter of each phase according to the grid connection point power of each phase, the power supply device 120 with three-phase three-wire power supply can use the average value of the three third power control parameters as the second power control parameter.

[0160] When the first controller 110 calculates the first power control parameter according to the grid connection point power at the grid connection point, the power supply device 120 with three-phase three-wire power supply can use the minimum value or the average value of the three third power control parameters as the second power control parameter.

[0161] In some embodiments, the power supply device 120 is used to take the minimum value of the three third power control parameters as the second power control parameter.

[0162] In this embodiment, the power supply device 120 performs a minimum value taking process on the three third power control parameters, determines the minimum value of the three third power control parameters, and uses this minimum value as the second power control parameter. The minimum value taking process can enable the power supply device 120 with three-phase three-wire power supply to carry the lowest load power per phase, and can avoid the situation of power feeding back to the grid in the phase with a relatively small load power during transient states, which is applicable to the three-phase independent anti-counterflow scenario of the power supply device 120 with three-phase three-wire power supply.

[0163] In some embodiments, the power supply device 120 is configured to use the average value of three third power control parameters as the second power control parameter.

[0164] In this embodiment, the power supply device 120 calculates the average value of the three third power control parameters to determine the average value of the three third power control parameters, and uses this average value as the second power control parameter. The averaging process can balance the load power of each phase of the power supply device 120 with three-phase three-wire power supply, and is applicable to the scenario of preventing reverse flow of the total power of the power supply device 120 with three-phase three-wire power supply.

[0165] A specific embodiment is introduced below.

[0166] As Figure 5 shown, the power supply device 120 with three-phase three-wire power supply receives the first power control parameter, obtains the third power control parameters P1a_local, P1b_local, and P1c_local according to its own device capacity, and calculates the second power control parameter P1_local by taking the minimum value.

[0167] Among them, P1_local is the minimum value of P1a_local, P1b_local, and P1c_local.

[0168] According to the state of charge balance reference value Bsoc and its own energy storage state, calculate the first balance power quantity ΔP1, and calculate the second balance power quantity ΔP2 according to its own power generation state. Add them as adjustment quantities to P1_local to obtain the final parameter P = P1_local + ΔP1 + ΔP2 for power control.

[0169] It can be understood that when the power supply device 120 is not connected to the energy storage device and the power generation device, there is no need to calculate ΔP1 and ΔP2.

[0170] In some embodiments, the power supply device 120 is a device with three-phase four-wire power supply. The power supply device 120 is configured to determine the second power control parameter of the power supply device 120 based on the first power control parameter and the device capacity information of the power supply device 120 itself.

[0171] In actual implementation, when the power supply device 120 with three-phase four-wire power supply receives the first power control parameter of each phase sent by the first controller 110, the power supply device 120 determines the second power control parameter of each phase of the power supply device 120 based on the first power control parameter of each phase and the device capacity information of the power supply device 120 itself, and performs independent power control for each phase according to the second power control parameter of each phase.

[0172] For example, for the power supply device 120 with three-phase four-wire power supply, according to the first power control parameters of the three phases issued by the first controller 110 and combined with its own device capacity information, the second power control parameters corresponding to each phase can be calculated, and each phase connected to the power supply device 120 performs power control according to its corresponding second power control parameter.

[0173] It can be understood that by separately controlling each phase of the power supply device 120 with three-phase four-wire power supply, the power supply device 120 can effectively control the zero-sequence component and drive unbalanced loads.

[0174] For example, the rated capacities of the power supply device 120 connected to phase A, phase B, and phase C are Pa_inv_local, Pb_inv_local, and Pc_inv_local respectively, and the power supply device 120 receives P1a_pu, P1b_pu, and P1c_pu issued by the first controller 110.

[0175] According to the corresponding relationship of the connected phases, calculate the second power control parameters of the power supply device 120 connected to phase A, phase B, and phase C, which are P1a_local = P1a_pu * Pa_inv_local, P1b_local = P1b_pu * Pb_inv_local, and P1c_local = P1c_pu * Pc_inv_local respectively.

[0176] A specific embodiment is introduced below.

[0177] As Figure 6 shown, the power supply device 120 with three-phase four-wire power supply receives the first power control parameters P1a_pu, P1b_pu, P1c_pu and the charge state balance reference value Bsoc, maps the first power control parameters to each phase according to its own device capacity, and calculates the second power control parameters P1a_local, P1b_local, P1c_local of the three phases.

[0178] Calculate the first balance power quantity ΔP1 according to Bsoc and its own energy storage state, calculate the second balance power quantity ΔP2 according to its own power generation state, and add them as adjustment quantities to P1a_local, P1b_local, P1c_local to obtain the final parameters for power control: Pa = P1_local + ΔP1 + ΔP2, Pb = P1b_local + ΔP1 + ΔP2, Pc = P1c_local + ΔP1 + ΔP2.

[0179] It should be noted that when the power supply system includes power supply devices 120 of single-phase, three-phase three-wire, and three-phase four-wire, the first controller 110 issues the first power control parameters, and each power supply device 120 restores its own second power control parameters. The single-phase power supply device 120 determines the corresponding second power control parameter it accesses. The three-phase three-wire power supply device 120 determines the second power control parameter through minimum value selection or averaging processing. The three-phase four-wire power supply device 120 determines the second power control parameter corresponding to each access. In the transient state, the three-phase three-wire power supply device 120 supplies power to the three-phase minimum load 140 in the power supply system, and the power required by the remaining loads 140 is provided by the single-phase and three-phase four-wire power supply devices 120.

[0180] In some embodiments, the first controller 110 can be an external controller independent of each power supply device 120.

[0181] For example, as Figure 1 shown, the first controller 110 is an independent controller. The first controller 110 is communicatively connected to each power supply device 120 of the power supply system (shown by the dashed line). The first controller 110 issues the first power control parameters and the charge state equalization reference value to each power supply device 120.

[0182] In some embodiments, the first controller 110 is a control unit on the power supply device 120.

[0183] In this embodiment, the power supply device 120 where the first controller 110 is located can be used as the host in the power supply system, and the remaining power supply devices 120 can be used as slaves. The host performs power scheduling on each slave and itself to improve the operating stability of the power supply system.

[0184] For example, as Figure 2 shown, the first controller 110 is a control unit on a three-phase four-wire power supply device 120 in the power supply system. The first controller 110 is communicatively connected to each power supply device 120 of the power supply system (shown by the dashed line). Each power supply device 120 is electrically connected in parallel (shown by the solid line). The first controller 110 issues the first power control parameters and the charge state equalization reference value to each power supply device 120.

[0185] The power supply system according to the embodiments of the present application proposes a power distribution strategy for the mixed connection scenario of single-phase, three-phase three-wire, and three-phase four-wire power supply devices 120. The first controller 110 performs macroscopic power allocation, and each power supply device 120 performs local adaptive adjustment based on the instructions issued by the first controller 110. It can make full use of the zero-sequence output capacity of the three-phase four-wire power supply device 120 and the single-phase adjustment capacity of the single-phase power supply device 120 in the power supply system, realize independent control of the power of each phase of the power supply system while maximizing the utilization of the generated power, regulate the balance of the available capacities among the power supply devices 120, and achieve the compatibility of economy and compliance.

[0186] Some specific embodiments will be described below.

[0187] For example, the power supply system is connected to the power grid 150, and the load 140 connected at the grid connection point is an unbalanced load. The powers of the A, B, and C phases of the load 140 are 1 kW, 2 kW, and 3 kW respectively, and the power supply system includes a mixed connection of three-phase three-wire and three-phase four-wire power supply devices 120.

[0188] Among them, the rated capacity of the three-phase four-wire power supply device 120 is 20 kW, the maximum photovoltaic power is 0 kW, the battery capacity of the energy storage is 10 kWh, and the state of charge is 50%.

[0189] The rated capacity of the three-phase three-wire power supply device 120 is 20 kW, the maximum photovoltaic power is 9 kW, the battery capacity of the energy storage is 10 kWh, and the state of charge is 50%.

[0190] In some embodiments, the first controller 110 calculates the first power control parameters that can satisfy the operation of the load 140 according to the grid connection point power of each phase as follows:

[0191] P1a_pu = 1 kW / (40 kW / 3) = 0.075;

[0192] P1b_pu = 2 kW / (40 kW / 3) = 0.15;

[0193] P1c_pu = 3 kW / (40 kW / 3) = 0.225.

[0194] And calculate the state of charge balance reference value Bsoc = Pbat / Cavail, where Pbat is determined according to the current total charge and discharge state of the energy storage, such as Pbat = 1.5 kW (charging).

[0195] In this embodiment, the three-phase three-wire power supply device 120 receives the above instructions and restores them to the second power control parameters according to its own device capacity as follows:

[0196] P1a_local = P1a_pu * Pa_inv_local = 0.5 kW;

[0197] P1b_local = P1b_pu * Pb_inv_local = 1.0 kw;

[0198] P1c_local = P1c_pu * Pc_inv_local = 1.5 kw;

[0199] Take the minimum value of P1a_local, P1b_local, and P1c_local to obtain the second power control parameter P1_local = 0.5 kw.

[0200] It can be understood that the average value of P1a_local, P1b_local, and P1c_local can also be taken to obtain the second power control parameter P1_local = 1.0 kw.

[0201] The three-phase three-wire power supply device 120 calculates the first balanced power quantity ΔP1 and the second balanced power quantity ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0202] Adjust P1_local = 0.5 kw through ΔP1 and ΔP2 to obtain the final parameter P = P1_local + ΔP1 + ΔP2 = 2.5 kw for power control.

[0203] In this embodiment, the three-phase four-wire power supply device 120 restores the above instructions to the second power control parameter according to its own device capacity as follows:

[0204] P1a_local = P1a_pu * Pa_inv_local = 0.5 kw;

[0205] P1b_local = P1b_pu * Pb_inv_local = 1.0 kw;

[0206] P1c_local = P1c_pu * Pc_inv_local = 1.5 kw.

[0207] The three-phase four-wire power supply device 120 calculates the first balanced power quantity ΔP1 and the second balanced power quantity ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0208] Adjust P1a_local, P1b_local, and P1c_local through ΔP1 and ΔP2 to obtain the final parameters for power control as follows:

[0209] Pa = P1a_local + ΔP1 + ΔP2 = -1.5 kw;

[0210] Pb = P1b_local + ΔP1 + ΔP2 = -0.5 kw;

[0211] Pc = P1c_local + ΔP1 + ΔP2 = 0.5 kw.

[0212] In some other embodiments, the first controller 110 calculates the first power control parameter corresponding to the operation of the load 140 according to the total power Pall = 1 kw + 2 kw + 3 kw = 6 kw at the grid connection point as follows:

[0213] P1a_pu = (6 kw / 3) / (40 kw / 3) = 0.15;

[0214] P1b_pu = (6 kw / 3) / (40 kw / 3) = 0.15;

[0215] P1c_pu = (6 kw / 3) / (40 kw / 3) = 0.15.

[0216] And calculate the state of charge balance reference value Bsoc = Pbat / Cavail.

[0217] In this embodiment, the three-phase three-wire power supply device 120 receives the above instructions and restores to the second power control parameter according to its own device capacity as follows:

[0218] P1a_local = P1a_pu * Pa_inv_local = 1.0 kw;

[0219] P1b_local = P1b_pu * Pb_inv_local = 1.0 kw;

[0220] P1c_local = P1c_pu * Pc_inv_local = 1.0 kw;

[0221] Take the minimum value of P1a_local, P1b_local, and P1c_local to obtain the second power control parameter P1_local = 1.0 kw.

[0222] It can be understood that the average value of P1a_local, P1b_local, and P1c_local can also be taken to obtain the second power control parameter P1_local = 0.5 kw.

[0223] The three-phase three-wire power supply device 120 calculates the first equalization power quantity ΔP1 and the second equalization power quantity ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0224] Adjust P1_local = 1.0 kw through ΔP1 and ΔP2 to obtain the final parameter for power control: P = P1_local + ΔP1 + ΔP2 = 3 kw.

[0225] In this embodiment, the three-phase four-wire power supply device 120 receives the above instruction and restores it to the second power control parameter according to its own device capacity as follows:

[0226] P1a_local = P1a_pu * Pa_inv_local = 1.0 kw;

[0227] P1b_local = P1b_pu * Pb_inv_local = 1.0 kw;

[0228] P1c_local = P1c_pu * Pc_inv_local = 1.0 kw.

[0229] Adjust P1a_local, P1b_local, and P1c_local through ΔP1 and ΔP2 to obtain the final parameters for power control as follows:

[0230] Pa = P1a_local + ΔP1 + ΔP2 = -0.5 kw;

[0231] Pb = P1b_local + ΔP1 + ΔP2 = -0.5 kw;

[0232] Pc = P1c_local + ΔP1 + ΔP2 = -0.5 kw.

[0233] For another example, the power supply system is connected to the power grid 150, and the load 140 connected at the grid connection point is an unbalanced load. The powers of the A, B, and C phases of the load 140 are 1 kw, 2 kw, and 3 kw respectively. The power supply system includes a mixed connection of single-phase, three-phase three-wire, and three-phase four-wire power supply devices 120.

[0234] Among them, the single-phase power supply device 120 is connected to the B phase, with a rated capacity of 5 kw, a maximum photovoltaic power of 0 kw, a battery capacity of the energy storage of 5 kWh, and a state of charge of 50%.

[0235] The three-phase four-wire power supply device 120 has a rated capacity of 20 kw, a maximum photovoltaic power of 0 kw, a battery capacity of the energy storage of 10 kWh, and a state of charge of 50%.

[0236] The three-phase three-wire power supply device 120 has a rated capacity of 10 kw, a maximum photovoltaic power of 0 kw, a battery capacity of the energy storage of 8 kWh, and a state of charge of 30%.

[0237] In some embodiments, the first controller 110 calculates the first power control parameters that can satisfy the operation of the load 140 according to the grid connection point power of each phase:

[0238] P1a_pu = 1 kw / (30 kw / 3) = 0.10;

[0239] P1b_pu = 2 kw / (30 kw / 3 + 5 kw) = 0.133;

[0240] P1c_pu = 3 kw / (30 kw / 3) = 0.3.

[0241] And calculate the state of charge balance reference value Bsoc = Pbat / Call, where Pbat is determined according to the current total charge and discharge state of the energy storage, such as Pbat = 1.5 kw (charging).

[0242] In this embodiment, the three-phase three-wire power supply device 120 receives the above instructions and restores them to the second power control parameters according to its own device capacity as follows:

[0243] P1a_local = P1a_pu * Pa_inv_local = 0.33 kw;

[0244] P1b_local = P1b_pu * Pb_inv_local = 0.44 kw;

[0245] P1c_local = P1c_pu * Pc_inv_local = 1 kw;

[0246] Take the minimum value of P1a_local, P1b_local, and P1c_local to obtain the second power control parameter P1_local = 0.33 kw.

[0247] It can be understood that the average value of P1a_local, P1b_local, and P1c_local can also be taken to obtain the second power control parameter P1_local = 0.59 kw.

[0248] The three-phase three-wire power supply device 120 calculates the first balance power quantity ΔP1 and the second balance power quantity ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0249] Taking the case where the minimum value is taken to obtain P1_local = 0.33 kw as an example, P1_local is adjusted through ΔP1 and ΔP2 to obtain the final parameter P = P1_local + ΔP1 + ΔP2 = 0.48 kw for power control.

[0250] In this embodiment, the three-phase four-wire power supply device 120 receives the above instruction and restores to the second power control parameter according to its own device capacity as follows:

[0251] P1a_local = P1a_pu * Pa_inv_local = 0.66 kw;

[0252] P1b_local = P1b_pu * Pb_inv_local = 0.88 kw;

[0253] P1c_local = P1c_pu * Pc_inv_local = 2 kw.

[0254] The three-phase four-wire power supply device 120 calculates the first balanced power quantity ΔP1 and the second balanced power quantity ΔP2 according to Bsoc, its own energy storage state and its own power generation state.

[0255] Through ΔP1 and ΔP2, adjust P1a_local, P1b_local, P1c_local, and the final parameters for power control are as follows:

[0256] Pa = P1a_local + ΔP1 + ΔP2 = 0.52 kw;

[0257] Pb = P1b_local + ΔP1 + ΔP2 = 0.02 kw;

[0258] Pc = P1c_local + ΔP1 + ΔP2 = 2.52 kw.

[0259] In this embodiment, the single-phase power supply device 120 receives the above instruction, restores to the second power control parameter P1_local = P1b_pu * Pb_inv_local = 0.66 kw according to its own access corresponding power parameter and its own device capacity, and adjusts P1_local through ΔP1 and ΔP2 to obtain the final parameter for power control P = P1_local + ΔP1 + ΔP2 = 1.5 kw.

[0260] In other embodiments, the first controller 110 calculates the first power control parameter corresponding to the operation of the load 140 to be satisfied according to the total power Pall = 1 kw + 2 kw + 3 kw = 6 kw at the grid connection point as follows:

[0261] P1a_pu = (6 kw / 3) / (20 kw / 3 + 10 kw / 3) = 0.2;

[0262] P1b_pu = (6 kw / 3) / (20 kw / 3 + 10 kw / 3 + 5 kw) = 0.13;

[0263] P1c_pu = (6 kw / 3) / (20 kw / 3 + 10 kw / 3) = 0.2.

[0264] And calculate the state of charge equilibrium reference value Bsoc = Pbat / Cavail.

[0265] In this embodiment, the three-phase three-wire power supply device 120 receives the above instruction and restores it to the second power control parameter according to its own device capacity as follows:

[0266] P1a_local = P1a_pu * Pa_inv_local = 0.66 kw;

[0267] P1b_local = P1b_pu * Pb_inv_local = 0.44 kw;

[0268] P1c_local = P1c_pu * Pc_inv_local = 0.66 kw;

[0269] Take the minimum value of P1a_local, P1b_local, and P1c_local to obtain the second power control parameter P1_local = 0.44 kw.

[0270] It can be understood that the average value of P1a_local, P1b_local, and P1c_local can also be taken to obtain the second power control parameter P1_local = 0.58 kw.

[0271] The three-phase three-wire power supply device 120 calculates the first equalization power quantity ΔP1 and the second equalization power quantity ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0272] Taking the minimum value to obtain P1_local = 0.44 kw as an example, through ΔP1 and ΔP2, adjust P1_local = 1.0 kw to obtain the final parameter P for power control = P1_local + ΔP1 + ΔP2 = 0.48 kw.

[0273] In this embodiment, the three-phase four-wire power supply device 120 receives the above instruction and restores it to the second power control parameter according to its own device capacity as follows:

[0274] P1a_local = P1a_pu * Pa_inv_local = 1.32 kw;

[0275] P1b_local = P1b_pu * Pb_inv_local = 0.88 kw;

[0276] P1c_local = P1c_pu * Pc_inv_local = 1.32 kw.

[0277] Based on ΔP1 and ΔP2, adjust P1a_local, P1b_local, and P1c_local to obtain the final parameters for power control as follows:

[0278] Pa = P1a_local + ΔP1 + ΔP2 = 1.17 kw;

[0279] Pb = P1b_local + ΔP1 + ΔP2 = 0.69 kw;

[0280] Pc = P1c_local + ΔP1 + ΔP2 = 1.17 kw.

[0281] In this embodiment, the single-phase power supply device 120 receives the above instructions, restores to the second power control parameter P1_local = P1b_pu * Pb_inv_local = 0.66 kw according to the accessed corresponding power parameters and its own device capacity, and adjusts P1_local based on ΔP1 and ΔP2 to obtain the final parameter for power control P = P1_local + ΔP1 + ΔP2 = 1.52 kw. For the scenario of connecting unbalanced loads in the mixed connection scenario, through the macro-control of the first controller 110 and the adaptive adjustment of each power supply device 120, a feasible power distribution direction is provided, adapting to the inherent characteristics of each power supply device 120, which can improve the control stability of the mixed connection scenario, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0282] The embodiment of the present application also provides a control method for a power supply system, and this control method for the power supply system can be used for the power supply system as described above.

[0283] The power supply system includes a first controller 110 and at least two power supply devices 120 connected in parallel. The first controller 110 is connected to the at least two power supply devices 120, and this control method for the power supply system is applied to the first controller 110.

[0284] The execution subject of this control method for the power supply system can be an electronic device or a functional module or functional entity in the electronic device that can implement this control method for the power supply system.

[0285] As Figure 7 shown, the control method for the power supply system applied to the first controller 110 includes step 710, step 720, and step 730.

[0286] Step 710: Obtain the grid connection point power of the power supply system accessing the power grid 150.

[0287] In this step, the first controller 110 can obtain the grid connection point power of the power supply system accessing the power grid 150 in real time.

[0288] Step 720: Determine the first power control parameter of the power supply system based on the grid connection point power.

[0289] The power information at the grid connection point where the power supply system accesses the power grid 150 reflects the power flow between the power supply system and the power grid 150. Through the grid connection point power of the power supply system accessing the power grid 150, the power information that the power supply system needs to adjust can be obtained. By determining the first power control parameter through the grid connection point power for control, the stability and balance at the grid connection point can be maintained.

[0290] Step 730: Send the first power control parameter to at least two power supply devices 120.

[0291] The first controller 110 sends the first power control parameter to at least two power supply devices 120, so that the power supply devices 120 determine the second power control parameter of the power supply devices 120 based on the first power control parameter and the device capacity information of the power supply devices 120 themselves, and perform power control based on the second power control parameter.

[0292] In this embodiment, the power supply device 120 receives the first power control parameter sent by the first controller 110, determines the second power control parameter for adjusting and controlling the power output of itself according to the first power control parameter and the device capacity information of the power supply device 120 itself, and performs its own power control according to the second power control parameter.

[0293] According to the control method of the power supply system provided by the embodiments of the present application, through the first controller 110 for macroscopic power allocation according to the grid connection point power, each power supply device 120 performs local adaptive adjustment based on the first power control parameter issued by the first controller 110 and according to its own device capacity information, which can improve the control stability of the hybrid connection scenario, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0294] In some embodiments, the power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, and the control method of the power supply system further includes:

[0295] Determine the state of charge balance reference value based on the current energy storage power and the current charge and discharge capacity of the energy storage system;

[0296] Send the state of charge (SOC) balance reference value to at least two power supply devices 120, so that the power supply device 120 connected to the energy storage device determines the first balanced power quantity based on the rated energy storage capacity, the current state of charge, and the SOC balance reference value of the energy storage device, and adjusts the second power control parameter based on the first balanced power quantity.

[0297] Wherein, the current charge and discharge capacity of the energy storage system is determined based on the rated energy storage capacity and the current state of charge of the energy storage system, or the current charge and discharge capacity of the energy storage system is determined based on the current charge and discharge capacities of each energy storage device. In this embodiment, the first controller 110 calculates the SOC balance reference value of the power supply system according to the current energy storage power and the current charge and discharge capacity of the energy storage system, and performs macro balance control.

[0298] The power supply device 120 connected to the energy storage device receives the SOC balance reference value. The power supply device 120 performs local adaptive adjustment according to the rated energy storage capacity, the current state of charge of the connected energy storage device, and the received SOC balance reference value to obtain the first balanced power quantity, and adjusts the second power control parameter through the first balanced power quantity to cooperate with the energy storage device for its own power control.

[0299] In some embodiments, determining the first power control parameter of the power supply system based on the grid connection point power may include:

[0300] Determine the first target power corresponding to the power supply system under load based on the grid connection point power;

[0301] Determine the first power control parameter based on the rated capacity information of the power supply system and the first target power.

[0302] In this embodiment, according to the current grid connection point power, with the goal of achieving the balanced state of the load 140 power consumption and the device power generation (the grid connection point power is controlled to 0), the first target power that satisfies the power supply system to operate under load is obtained, and combined with the rated capacity information of the power supply system, the first power control parameter is determined.

[0303] The embodiment of the present application also provides a control method for a power supply system, and this control method for a power supply system can be used for the power supply system as described above.

[0304] The power supply system includes a first controller 110 and at least two power supply devices 120 connected in parallel. The first controller 110 is connected to at least two power supply devices 120, and this control method for a power supply system is applied to the power supply device 120.

[0305] The execution subject of this control method for a power supply system can be an electronic device or a functional module or functional entity in the electronic device that can implement this control method for a power supply system.

[0306] Such asFigure 8 As shown in Figure 8 , the control method for the power supply system applied to the power supply device 120 includes step 810, step 820, and step 830.

[0307] Step 810: Receive the first power control parameter sent by the first controller 110.

[0308] The first power control parameter of each phase is determined based on the grid connection point power of each phase of the power supply system connected to the power grid 150.

[0309] In this step, the first controller 110 determines the first power control parameter of each phase according to the grid connection point power of the power supply system connected to the power grid 150, and sends the first power control parameter to the power supply device 120. The power supply device 120 receives the first power control parameter sent by the first controller 110.

[0310] Step 820: Determine the second power control parameter of the power supply device 120 based on the first power control parameter and the device capacity information of the power supply device 120 itself.

[0311] Step 830: Perform power control based on the second power control parameter.

[0312] According to the control method of the power supply system provided by the embodiment of the present application, through the first controller 110 for macroscopic power allocation according to the grid connection point power, the power supply device 120 performs local adaptive adjustment according to its own device capacity information on the basis of the first power control parameter sent by the first controller 110, which can improve the control stability in the mixed connection scenario, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0313] In some embodiments, the power supply device 120 is a single-phase power supply device, and the second power control parameter is determined through the following steps:

[0314] Based on the first power control parameter corresponding to the power supply device 120 and the device capacity information of the power supply device 120 itself, determine the second power control parameter corresponding to the power supply device 120.

[0315] In some embodiments, the power supply device 120 is a three-phase three-wire power supply device, and the second power control parameter is determined through the following steps:

[0316] Based on the first power control parameter and the device capacity information of the power supply device 120 itself, determine three third power control parameters, and each third power control parameter corresponds to one access phase of the power supply device 120;

[0317] Based on the three third power control parameters, determine the second power control parameter.

[0318] In some embodiments, determining the second power control parameter based on three third power control parameters includes:

[0319] Taking the minimum value among the three third power control parameters as the second power control parameter.

[0320] In some embodiments, the power supply device 120 is a device with three-phase four-wire power supply, and the second power control parameter is determined through the following steps:

[0321] Based on the first power control parameter and the device capacity information of the power supply device 120 itself, determine the second power control parameter of the power supply device 120.

[0322] In some embodiments, the power supply system is connected to the energy storage system. The energy storage system includes at least one energy storage device, and the power supply device 120 is connected to the energy storage device. Before performing power control based on the second power control parameter, the control method of the power supply system further includes:

[0323] Receiving the state of charge balance reference value sent by the first controller 110, where the state of charge balance reference value is determined based on the current energy storage power and the current charge and discharge capacity of the energy storage system;

[0324] Based on the rated energy storage capacity, the current state of charge, and the state of charge balance reference value of the energy storage device, determine the first equalization power quantity;

[0325] Adjust the second power control parameter based on the first equalization power quantity.

[0326] In some embodiments, the power supply system is connected to the power generation system. The power generation system includes at least one power generation device, and the power supply device 120 is connected to the power generation device. Before performing power control based on the second power control parameter, the control method of the power supply system further includes:

[0327] Based on the current power generation state of the power generation device, determine the second equalization power quantity;

[0328] Adjust the second power control parameter based on the second equalization power quantity.

[0329] In some embodiments, as Figure 9 shown, an embodiment of the present application further provides an electronic device 900, including a processor 901, a memory 902, and a computer program stored on the memory 902 and executable on the processor 901. When the program is executed by the processor 901, it implements each process of the control method embodiment of the above power supply system and can achieve the same technical effect. To avoid repetition, it will not be elaborated here.

[0330] It should be noted that the electronic devices in the embodiments of the present application include the above-mentioned mobile electronic devices and non-mobile electronic devices.

[0331] The embodiment of the present application also provides a non-transitory computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, it implements each process of the control method embodiment of the above power supply system and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0332] Wherein, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disc, etc.

[0333] The embodiment of the present application also provides a computer program product, including a computer program, which implements the control method of the above power supply system when executed by a processor.

[0334] Wherein, the processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes computer-readable storage media, such as computer read-only memory ROM, random access memory RAM, magnetic disk or optical disc, etc.

[0335] The embodiment of the present application further provides a chip, which includes a processor and a communication interface. The communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement each process of the control method embodiment of the above power supply system and can achieve the same technical effects. To avoid repetition, it will not be elaborated here.

[0336] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system-on-chip, system chip, chip system or system-on-chip, etc.

[0337] It should be noted that in this article, the term "including", "comprising" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. Without further limitation, the element defined by the statement "including a..." does not exclude the existence of additional identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the methods and devices in the embodiments of the present application are not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in a reverse order according to the functions involved. For example, the described methods can be performed in an order different from that described, and various steps can be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0338] Through the description of the above embodiments, those skilled in the art can clearly understand that the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Of course, they can also be implemented by hardware, but in many cases the former is a better implementation method. Based on such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, can be embodied in the form of a computer software product. The computer software product is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes several instructions for causing a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in various embodiments of the present application.

[0339] The embodiments of the present application have been described above in conjunction with the accompanying drawings. However, the present application is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present application, those of ordinary skill in the art can also make many forms without departing from the purpose of the present application and the scope protected by the claims, and all of them belong to the protection scope of the present application.

[0340] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "illustrative embodiments", "examples", "specific examples", or "some examples", etc. means that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0341] Although the embodiments of the present application have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and purposes of the present application. The scope of the present application is defined by the claims and their equivalents.

Claims

1. A power supply system, characterized in that: include: At least two power supply devices connected in parallel; A first controller, the first controller is connected to the at least two power supply devices; The first controller is used to determine a first power control parameter of the power supply system based on the power of the grid connection point where the power supply system is connected to the power grid, and send the first power control parameter to the at least two power supply devices; The power supply device is used to determine a second power control parameter of the power supply device based on the first power control parameter and device capacity information of the power supply device itself, and perform power control based on the second power control parameter; The power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, and the first controller is used to determine a state of charge balancing reference value based on a current energy storage power and a current chargeable and dischargeable amount of the energy storage system, and send the state of charge balancing reference value to the at least two power supply devices; The power supply device is connected to the energy storage device, and the power supply device is used to determine a first balanced power amount based on the energy storage rated capacity, the current state of charge and the state of charge balance reference value of the energy storage device, and adjust the second power control parameter based on the first balanced power amount; Through the following formula: Bsoc=Pbat ​​ / Cavail Calculating the charge state equalization reference value; Wherein, Bsoc is the charge state balance reference value, Pbat is the current energy storage power of the energy storage system, and Cavail is the current chargeable and dischargeable amount of the energy storage system; The first balanced power amount is obtained by the following steps: Based on the energy storage rated capacity and the current state of charge of the energy storage device, the current chargeable and dischargeable amount of the energy storage device is obtained, and combined with the state of charge balance reference value, a first balance power amount is obtained; When the energy storage device is in a charging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * (1-SOClocal); when the energy storage device is in a discharging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * SOClocal, wherein Clocal is the rated energy storage capacity of the energy storage device, and SOClocal is the current state of charge of the energy storage device; The power supply device includes a conversion circuit for realizing power conversion between DC voltage and AC voltage; The first balanced power amount ΔP1 is calculated according to the PID algorithm, and the output is continuously adjusted so that the feedback signal of the charging and discharging power reaches the expected value Pbat_ref, the expected value of the charging and discharging power Pbat_ref=Cavail_local*Bsoc, and the current chargeable and dischargeable amount of the energy storage device connected to the power supply device is Cavail_local.

2. The power supply system according to claim 1, characterized in that: The first controller is used to determine the current chargeable and dischargeable amount of the energy storage system based on the energy storage rated capacity and the current state of charge of the energy storage system; Alternatively, the first controller is used to determine the current chargeable and dischargeable capacity of the energy storage system based on the current chargeable and dischargeable capacity of each of the energy storage devices.

3. The power supply system according to claim 1, characterized in that: The power supply system is connected to a power generation system, the power generation system includes at least one power generation device, the power supply device is connected to the power generation device, and the power supply device is used to determine a second balanced power amount based on a current power generation state of the power generation device, and adjust the second power control parameter based on the second balanced power amount.

4. The power supply system according to claim 1, characterized in that: The power supply device is a single-phase power supply device, and is used to determine the corresponding second power control parameter connected to the power supply device based on the corresponding first power control parameter connected to the power supply device and the device capacity information of the power supply device itself.

5. The power supply system according to claim 1, characterized in that: The power supply device is a three-phase three-wire power supply device, and is used to determine three third power control parameters based on the first power control parameter and the device capacity information of the power supply device itself, and determine the second power control parameter based on the three third power control parameters, each of the third power control parameters corresponds to an access phase of the power supply device.

6. The power supply system according to claim 5, characterized in that: The power supply device is used to use the minimum value of the three third power control parameters as the second power control parameter.

7. The power supply system according to claim 5, characterized in that: The power supply device is used to use an average value of the three third power control parameters as the second power control parameter.

8. The power supply system according to claim 1, characterized in that: The power supply device is a three-phase four-wire power supply device, and the power supply device is used to determine the second power control parameter of the power supply device based on the first power control parameter and device capacity information of the power supply device itself.

9. The power supply system according to any one of claims 1 to 8, characterized in that: The first controller is used to determine a first target power corresponding to the load of the power supply system based on the grid connection point power, and to determine the first power control parameter based on the rated capacity information of the power supply system and the first target power.

10. The power supply system according to any one of claims 1 to 8, characterized in that: The first controller is a control unit on the power supply device or an external controller independent of each of the power supply devices.

11. A control method for a power supply system, characterized in that: The power supply system includes a first controller and at least two power supply devices connected in parallel, the first controller is connected to the at least two power supply devices, the method is applied to the first controller, and the method includes: Obtaining the power of the grid connection point where the power supply system is connected to the power grid; Based on the grid connection point power, determining a first power control parameter of the power supply system; Sending the first power control parameter to the at least two power supply devices, so that the power supply devices determine the second power control parameter of the power supply devices based on the first power control parameter and the device capacity information of the power supply devices themselves, and perform power control based on the second power control parameter; The power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, and the method further includes: Determining a charge state balance reference value based on a current energy storage power and a current chargeable and dischargeable amount of the energy storage system; Sending the state of charge balancing reference value to the at least two power supply devices, so that the power supply device connected to the energy storage device determines a first balancing power amount based on the energy storage rated capacity of the energy storage device, the current state of charge and the state of charge balancing reference value, and adjusts the second power control parameter based on the first balancing power amount; Through the following formula: Bsoc=Pbat ​​ / Cavail Calculating the charge state equalization reference value; Wherein, Bsoc is the charge state balance reference value, Pbat is the current energy storage power of the energy storage system, and Cavail is the current chargeable and dischargeable amount of the energy storage system; The first balanced power amount is obtained by the following steps: Based on the energy storage rated capacity and the current state of charge of the energy storage device, the current chargeable and dischargeable amount of the energy storage device is obtained, and combined with the state of charge balance reference value, a first balance power amount is obtained; When the energy storage device is in a charging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * (1-SOClocal); when the energy storage device is in a discharging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * SOClocal, wherein Clocal is the rated energy storage capacity of the energy storage device, and SOClocal is the current state of charge of the energy storage device; The power supply device includes a conversion circuit for realizing power conversion between DC voltage and AC voltage; The first balanced power amount ΔP1 is calculated according to the PID algorithm, and the output is continuously adjusted so that the feedback signal of the charging and discharging power reaches the expected value Pbat_ref, the expected value of the charging and discharging power Pbat_ref=Cavail_local*Bsoc, and the current chargeable and dischargeable amount of the energy storage device connected to the power supply device is Cavail_local.

12. The control method of the power supply system according to claim 11, characterized in that: The determining, based on the grid connection point power, a first power control parameter of the power supply system comprises: Based on the grid connection point power, determining a first target power corresponding to the load of the power supply system; The first power control parameter is determined based on the rated capacity information of the power supply system and the first target power.

13. A control method for a power supply system, characterized in that: The power supply system includes a first controller and at least two power supply devices connected in parallel, the first controller is connected to the at least two power supply devices, the method is applied to the power supply devices, and the method includes: Receiving a first power control parameter sent by the first controller, where the first power control parameter is determined based on the power of a grid connection point where the power supply system is connected to a power grid; Determining a second power control parameter of the power supply device based on the first power control parameter and device capacity information of the power supply device itself; performing power control based on the second power control parameter; The power supply system is connected to an energy storage system, the energy storage system includes at least one energy storage device, the power supply device is connected to the energy storage device, and before the power control is performed based on the second power control parameter, the method further includes: Receiving a state of charge balancing reference value sent by the first controller, wherein the state of charge balancing reference value is determined based on a current energy storage power and a current chargeable and dischargeable amount of the energy storage system; Determining a first balancing power amount based on the energy storage rated capacity of the energy storage device, the current state of charge, and the state of charge balancing reference value; adjusting the second power control parameter based on the first balanced power amount; Through the following formula: Bsoc=Pbat ​​ / Cavail Calculating the charge state equalization reference value; Wherein, Bsoc is the charge state balance reference value, Pbat is the current energy storage power of the energy storage system, and Cavail is the current chargeable and dischargeable amount of the energy storage system; The first balanced power amount is obtained by the following steps: Based on the energy storage rated capacity and the current state of charge of the energy storage device, the current chargeable and dischargeable amount of the energy storage device is obtained, and combined with the state of charge balance reference value, a first balance power amount is obtained; When the energy storage device is in a charging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * (1-SOClocal); when the energy storage device is in a discharging state, the current chargeable and dischargeable amount of the energy storage device Cavail_local = Clocal * SOClocal, wherein Clocal is the rated energy storage capacity of the energy storage device, and SOClocal is the current state of charge of the energy storage device; The power supply device includes a conversion circuit for realizing power conversion between DC voltage and AC voltage; The first balanced power amount ΔP1 is calculated according to the PID algorithm, and the output is continuously adjusted so that the feedback signal of the charging and discharging power reaches the expected value Pbat_ref, the expected value of the charging and discharging power Pbat_ref=Cavail_local*Bsoc, and the current chargeable and dischargeable amount of the energy storage device connected to the power supply device is Cavail_local.

14. The control method of the power supply system according to claim 13, characterized in that: The power supply device is a single-phase power supply device, and the second power control parameter is determined by the following steps: Based on the first power control parameter corresponding to the power supply device and the device capacity information of the power supply device itself, the second power control parameter corresponding to the power supply device is determined.

15. The control method of the power supply system according to claim 13, characterized in that: The power supply device is a three-phase three-wire power supply device, and the second power control parameter is determined by the following steps: Based on the first power control parameter and the device capacity information of the power supply device itself, three third power control parameters are determined, each of the third power control parameters corresponds to an access phase of the power supply device; Based on the three third power control parameters, the second power control parameter is determined.

16. The control method of the power supply system according to claim 15, characterized in that: The determining the second power control parameter based on the three third power control parameters includes: The minimum value of the three third power control parameters is used as the second power control parameter.

17. The control method of the power supply system according to claim 13, characterized in that: The power supply device is a three-phase four-wire power supply device, and the second power control parameter is determined by the following steps: The second power control parameter corresponding to the power supply device is determined based on the first power control parameter and device capacity information of the power supply device itself.

18. The control method of the power supply system according to any one of claims 13 to 17, characterized in that: The power supply system is connected to a power generation system, the power generation system includes at least one power generation device, the power supply device is connected to the power generation device, and before the power control is performed based on the second power control parameter, the method further includes: determining a second balancing power amount based on a current power generation state of the power generation equipment; The second power control parameter is adjusted based on the second balanced power amount.

19. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the control method of the power supply system as described in any one of claims 11-18 is implemented.

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