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

Abstract

The invention discloses a power supply system, a control method of the power supply system and electronic equipment, and belongs to the technical field of power supply. The power supply system comprises at least two power supply devices which are connected in parallel; the first controller is connected with the at least two pieces of power supply equipment; the first controller is used for determining a first power control parameter of the power supply system based on grid-connected point power of a power grid accessed by the power supply system, and sending the first power control parameter to the at least two power supply devices; and the power supply equipment is used for determining a second power control parameter of the power supply equipment based on the first power control parameter and equipment capacity information of the power supply equipment, and performing power control based on the second power control parameter. The power supply system can improve the control stability of a mixed connection scene, gives consideration to the control characteristics of various power supply devices, and achieves 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 the 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: 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.

[0006] According to the power supply system of the present application, macro power allocation is performed according to the grid connection point power through the first controller. Each power supply device performs local adaptive adjustment based on its own equipment capacity information on the basis of the first power control parameter issued by the first controller. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

[0007] According to one 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 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, current state of charge and the state of charge balancing reference value of the energy storage device, and adjust the second power control parameter based on the first balanced power amount.

[0008] According to one embodiment of the present application, 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.

[0009] According to one embodiment of the present application, the power supply system is connected to the 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 the second balanced power amount based on the current power generation status of the power generation device, and adjust the second power control parameter based on the second balanced power amount.

[0010] According to one embodiment of the present application, the power supply device is a single-phase power supply device, and the power supply device 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.

[0011] According to one embodiment of the present application, the power supply device is a three-phase three-wire power supply device, and the power supply device 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 corresponding to an access phase of the power supply device.

[0012] According to an embodiment of the present application, the power supply device is used to use the minimum value of the three third power control parameters as the second power control parameter.

[0013] According to an embodiment of the present application, the power supply device is used to use an average value of the three third power control parameters as the second power control parameter.

[0014] 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 used 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.

[0015] According to one embodiment of the present application, the first controller is used to determine the first target power corresponding to the load of the power supply system 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.

[0016] According to one embodiment of the present application, the first controller is a control unit on the power supply device or an external controller independent of each of the power supply devices.

[0017] In a second aspect, the present application provides a control method for a power supply system, the power supply system comprising a first controller and at least two power supply devices connected in parallel, the first controller being connected to the at least two power supply devices, the method being applied to the first controller, the method comprising: 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; The first power control parameter is sent to the at least two power supply devices, so that the power supply devices determine their second power control parameters based on the first power control parameter and their own device capacity information, and perform power control based on the second power control parameter.

[0018] According to the control method of the power supply system of the present application, the first controller performs macro power allocation according to the grid connection point power, and each power supply device performs local adaptive adjustment based on its own equipment capacity information on the basis of the first power control parameter issued by the first controller. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various power supply devices, and achieve the compatibility of economy and compliance.

[0019] According to one 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: 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; The state of charge balancing reference value is sent 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, the current state of charge and the state of charge balancing reference value of the energy storage device, and adjusts the second power control parameter based on the first balancing power amount.

[0020] According to an embodiment of the present application, determining a first power control parameter of the power supply system based on the grid connection point power includes: 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.

[0021] In a third 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 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; Power control is performed based on the second power control parameter.

[0022] According to the control method of the power supply system of the present application, the first controller performs macro power allocation according to the grid connection point power, and the power supply equipment performs local adaptive adjustment based on the first power control parameter issued by the first controller and according to its own equipment capacity information. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various types of power supply equipment, and achieve the compatibility of economy and compliance.

[0023] 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 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.

[0024] 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 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.

[0025] According to an embodiment of the present application, 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.

[0026] 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 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.

[0027] According to one 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 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; The second power control parameter is adjusted based on the first balanced power amount.

[0028] According to one 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 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.

[0029] In a fourth aspect, the present application provides an electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein when the processor executes the computer program, the control method of the power supply system as described in the second aspect or the third aspect is implemented.

[0030] In a fifth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, and when the computer program is executed by a processor, the control method of the power supply system as described in the second aspect or the third aspect above is implemented.

[0031] In a sixth aspect, the present application provides a computer program product, including a computer program, which, when executed by a processor, implements the control method of the power supply system as described in the second aspect or the third aspect above.

[0032] Additional aspects and advantages of the present application will be given in part in the description below, and in part will become apparent from the description below, or will be learned through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which: Figure 1 It is one of the structural schematic diagrams of the power supply system provided in the embodiment of the present application; Figure 2 This is the second structural diagram of the power supply system provided in the embodiment of the present application; Figure 3 It is a schematic diagram of a process of power scheduling performed by a first controller provided in an embodiment of the present application; Figure 4 It is a schematic diagram of a process for power scheduling of a single-phase power supply device provided in an embodiment of the present application; Figure 5 It is a schematic diagram of a process for power scheduling of a three-phase three-wire power supply device provided in an embodiment of the present application; Figure 6 It is a schematic diagram of a process for power scheduling of a three-phase four-wire power supply device provided in an embodiment of the present application; Figure 7 It is one of the flow charts of the control method of the power supply system provided in the embodiment of the present application; Figure 8 This is a second flow chart of a control method for a power supply system provided in an embodiment of the present application; Fig. 9 It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0034] Reference numerals: A first controller 110 , a power supply device 120 , a DC device 130 , a load 140 , and a power grid 150 . DETAILED DESCRIPTION

[0035] The following will be combined with the drawings in the embodiments of the present application to clearly describe the technical solutions 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. All other embodiments obtained by ordinary technicians in this field based on the embodiments in the present application belong to the scope of protection of this application.

[0036] The terms "first", "second", etc. in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and / or" in the specification and claims represents at least one of the connected objects, and the character " / " generally indicates that the objects associated with each other are in an "or" relationship.

[0037] The power supply system, the control method of the power supply system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail below with reference to the accompanying drawings through specific embodiments and their application scenarios.

[0038] like Figure 1 As 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 .

[0039] The power supply device 120 may include a conversion circuit for realizing power conversion between a DC voltage and an AC voltage. The power supply device 120 may be an inverter, a converter, or other equipment.

[0040] One end of the power supply device 120 is connected to the DC device 130 , and a plurality of power supply devices 120 are connected in parallel to form a power supply system that can be connected to the power grid 150 .

[0041] 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 equipment, energy storage equipment, photovoltaic storage equipment (photovoltaic and energy storage) and other equipment.

[0042] It should be noted that the power supply system includes two or more power supply devices 120, and the types of power supply devices 120 can be different, including but not limited to power supply devices 120 with single-phase, three-phase three-wire, three-phase four-wire and other output modes.

[0043] like Figure 1 As 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.

[0044] The first controller 110 is a device that performs 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 in the power supply system, monitor the operating status 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.

[0045] It is understandable that the power supply system can be connected to the power grid 150, transmit electric energy to the power grid 150, or remove power from the power grid 150, and the first controller 110 can monitor the state of the grid connection point where the power supply system is connected to the power grid 150.

[0046] In this embodiment, the first controller 110 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 150 , and send the first power control parameter to at least two power supply devices 120 .

[0047] It should be noted that the power information at the grid connection point where the power supply system is connected to the power grid 150 reflects the power flow between the power supply system and the power grid 150. The power information that needs to be adjusted by the power supply system can be obtained by determining the first power control parameter through the grid connection point power for control, thereby maintaining stability and balance at the grid connection point.

[0048] It can be understood that the power grid 150 can use three-phase electricity, having phase A, phase B and phase C. The grid connection point power of the power supply system connected to the power grid 150 can be the total power at the grid connection point, or it can be the grid connection point power of each phase of the power supply system connected to the power grid 150, which can include the power corresponding to phase A, phase B and phase C at the grid connection point.

[0049] 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.

[0050] In other embodiments, the first controller 110 determines the first power control parameters corresponding to phase A, phase B and phase C in the power supply system according to the powers corresponding to 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 in the power supply system.

[0051] 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 device capacity information of the power supply device 120 itself, and perform power control based on the second power control parameter.

[0052] In this embodiment, when the power supply device 120 receives the first power control parameters of each phase sent by the first controller 110, the second power control parameters of each phase of the power supply device 120 are determined based on the first power control parameters of each phase and the equipment capacity information of the power supply device 120 itself, and its own power control is performed according to the second power control parameters of each phase.

[0053] 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, and the type, rated power, rated capacity and other information of each power supply device 120 are different. The second power control parameters determined by each power supply device 120 based on its own equipment capacity information and the first power control parameters may be different. When power control is performed through the second power control parameters, the inherent characteristics of each power supply device 120 itself can be adapted.

[0054] In order to avoid control instability, most related technologies choose to avoid mixed connections, or perform simple power distribution based on inverter models or a single control target. The distribution result is often not the optimal operating state for the application scenario, resulting in a waste of part of the available capacity, or failure to maintain capacity balance between devices, making it difficult to achieve system compatibility in terms of economy and compliance.

[0055] In an embodiment of the present application, macro power allocation is performed according to the grid power through the first controller 110. Each power supply device 120 performs local adaptive adjustment based on its own equipment capacity information on the basis of the first power control parameter issued by the first controller 110, supports power allocation in single-phase, three-phase three-wire and three-phase four-wire mixed connection scenarios, takes the power flow at the grid point as the control basis, and takes the difference in output capacity between each power supply device 120 into account. Each power supply device 120 calculates independently and can also realize the control of each phase power. It is suitable for power allocation under various loads 140, prevents the occurrence of instability in power supply system control, and can take into account the control characteristics of various power supply devices 120 to achieve compatibility between economy and compliance.

[0056] According to the power supply system provided in the embodiment of the present application, the first controller 110 performs macro power allocation according to the grid connection point power, and each power supply device 120 performs local adaptive adjustment according to its own equipment capacity information on the basis of the first power control parameter issued by the first controller 110. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0057] In some embodiments, the first controller 110 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 determine a first power control parameter based on the rated capacity information of the power supply system and the first target power.

[0058] The first target power is a power target value for the power supply system to adjust the power to meet the power supply system connected to the load 140 for operation.

[0059] In actual implementation, 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 of the power supply system based on the grid connection point power of each phase, and determine the first power control parameter of each phase based on the rated capacity information of each phase of the power supply system and the first target power.

[0060] In actual implementation, the rated capacity information of each phase of the power supply system can be obtained by summing the rated capacity of each phase of each power supply device 120 in the power supply system.

[0061] In this embodiment, based on the current grid-connected point power, with the goal of achieving a balanced state between the power consumption of load 140 and the power generation of the equipment (the grid-connected point power is controlled to 0), a first target power that satisfies the load operation of the power supply system is obtained, and the first power control parameter is determined in combination with the rated capacity information of the power supply system.

[0062] For example, the first controller 110 obtains the grid connection point power of each phase of the power supply system connected to the power grid 150.

[0063] For example, the rated capacity information of phase A, phase B and phase C in the power supply system are Pa_inv_all, Pb_inv_all and Pc_inv_all respectively. The first controller 110 obtains the current grid connection point power of each phase and calculates the first target power P1a, P1b and P1c of phase A, phase B and phase C respectively.

[0064] It is understandable that the power values ​​such as the grid connection point power of each phase, the first target power, etc. can be positive or negative. A positive power value indicates that power is fed into the grid 150 , and a negative power value indicates that power is removed from the grid 150 .

[0065] The corresponding first target power is normalized 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.

[0066] It should be noted that, for a power supply system in which various types of power supply equipment 120 are mixed, the corresponding rated capacity information is calculated separately. When the power supply system includes a single-phase power supply equipment 120 connected to a certain phase, the rated capacity information of each phase of the power supply system may be different. By determining the first power control parameter through the rated capacity information of each phase of the power supply system, different types of power supply equipment 120 in the mixed scenario can be taken into account.

[0067] 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 first controller 110 is used to determine the state of charge balance reference value based on the current energy storage power and the current chargeable and dischargeable amount of the energy storage system, and send the state of charge balance reference value to at least two power supply devices 120; The power supply device 120 is connected to the energy storage device, and is used to determine a first balanced power amount based on the energy storage rated capacity, current state of charge and 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.

[0068] Among them, the current energy storage power of the energy storage system is the current charging and discharging rate of each energy storage device in the energy storage system, and the current energy storage power is related to the current total energy storage charging and discharging state of the energy storage system; the current chargeable and dischargeable capacity of the energy storage system is the current chargeable capacity of the energy storage system or the current dischargeable capacity of the energy storage system.

[0069] In this embodiment, the first controller 110 calculates the charge state balancing reference value of the power supply system according to the current energy storage power and the current chargeable and dischargeable capacity of the energy storage system, and performs macroscopic balancing control.

[0070] The current chargeable and dischargeable capacity of the energy storage system can be calculated in at least two ways as follows.

[0071] In some embodiments, the first controller 110 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.

[0072] In this embodiment, the current chargeable and dischargeable capacity of the energy storage system can be obtained by performing calculations based on the total energy storage rated capacity and the total current state of charge of the energy storage system.

[0073] For example, the energy storage system has n energy storage devices, Cn represents the rated capacity of the energy storage of the nth energy storage device, and SOCn represents the current state of charge of the nth energy storage device.

[0074] The total energy storage rated 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 is calculated by weighted average.

[0075] When the energy storage system is in a discharging state, the current chargeable and dischargeable amount of the energy storage system Cavail = Call* (1-SOCall); when the energy storage system is in a charging state, the current chargeable and dischargeable amount of the energy storage system Cavail = Call * SOCall.

[0076] In some embodiments, the first controller 110 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 energy storage device.

[0077] In this embodiment, the current chargeable and dischargeable capacity of the energy storage device itself is first calculated according to the rated energy storage capacity and the current state of charge of the energy storage device, and the current chargeable and dischargeable capacity of each energy storage device in the energy storage system is summed to calculate the current chargeable and dischargeable capacity of the energy storage system.

[0078] For example, the energy storage system has n energy storage devices, Cn represents the rated capacity of the energy storage of the nth energy storage device, and SOCn represents the current state of charge of the nth energy storage device.

[0079] The current chargeable and dischargeable capacity of each energy storage device is calculated respectively. For the nth energy storage device, when it is in the charging state, the current chargeable and dischargeable capacity of the energy storage device Cavail_n = Cn * (1-SOCn); when it is in the discharging state, the current chargeable and dischargeable capacity of the energy storage device Cavail_n = Cn * SOCn.

[0080] By summing up the current chargeable and dischargeable capacities of n energy storage devices in the energy storage system, we can calculate the current chargeable and dischargeable capacities of the energy storage system Cavail = Cavail_1+Cavail_2+Cavail_3+...+Cavail_n.

[0081] In actual implementation, after obtaining the current chargeable and dischargeable capacity of the energy storage system, the following formula can be used: Bsoc=Pbat ​​ / Cavail Calculate the state of charge balance reference value of the power supply system, where Bsoc is the state of charge 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.

[0082] The state of charge balancing reference value may be positive or negative. When the state of charge balancing reference value is positive, it represents a dischargeable capacity reference for balancing control. When the state of charge balancing reference value is negative, it represents a chargeable capacity reference for balancing control.

[0083] In this embodiment, the power supply device 120 connected to the energy storage device receives a state of charge balancing reference value. The power supply device 120 performs local adaptive adjustment according to the energy storage rated capacity of the connected energy storage device, the current state of charge and the received state of charge balancing reference value to obtain a first balanced power amount, adjusts the second power control parameter according to the first balanced power amount, and cooperates with the energy storage device to perform its own power control.

[0084] In actual implementation, the power supply device 120 can calculate the current chargeable and dischargeable amount of the energy storage device according to the energy storage rated capacity and current state of charge of the connected energy storage device, and calculate the first balanced power amount in combination with the state of charge balance reference value.

[0085] 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, 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.

[0086] It should be noted that the first balanced power is the power balanced and adjusted by the energy storage. 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 balanced power.

[0087] In actual implementation, the expected value of the charging and discharging power of the energy storage device connected to the power supply device 120 can be calculated based on the current chargeable and dischargeable capacity and the charge state balance reference value, and the first balance power can be determined based on the expected value of the charging and discharging power, and the second power control parameter can be adjusted to perform self-power control.

[0088] For example, the current chargeable and dischargeable amount of the energy storage device connected to the power supply device 120 is Cavail_local, the charge state balance reference value is Bsoc, and the charge and discharge power expected value Pbat_ref=Cavail_local*Bsoc.

[0089] In this embodiment, 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.

[0090] It should be noted that the state of charge balancing reference value and the first power control parameter are control parameters for the first controller 110 to perform macro-control according to the overall state of the power supply system, and are sent to each power supply device 120, which performs local adaptive adjustment according to its own equipment conditions. Among them, the state of charge balancing reference value and the first power control parameter can be expressed in the form of a proportional coefficient or other forms.

[0091] A specific embodiment is described below.

[0092] like Figure 3 As shown, the first controller 110 obtains information such as the grid connection point power of each phase, rated capacity information, current energy storage power, and energy storage rated capacity.

[0093] The first controller 110 calculates the first target power P1a, P1b, P1c of each phase according to the grid connection point power of each phase, and can calculate the first power control parameters P1a_pu, P1b_pu, P1c_pu of each phase in combination with the rated capacity information of the power supply system.

[0094] The charge state balance reference value Bsoc is calculated based on the current energy storage power Pbat and the current chargeable and dischargeable amount Cavail.

[0095] In this embodiment, the first controller 110 sends control parameters P1a_pu, P1b_pu, P1c_pu, and Bsoc for macro-control to each power supply device 120 .

[0096] 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, the power supply device 120 is connected to the power generation device, and the power supply device 120 is used to determine the second balanced power amount based on the current power generation status of the power generation device, and adjust the second power control parameter based on the second balanced power amount.

[0097] In this embodiment, for the power supply device 120 connected to the power generation equipment, after receiving the second power control parameter, the power supply device 120 can perform local adaptive adjustment according to the current power generation status of the power generation equipment connected to the power supply device 120 to obtain the second balanced power amount, and adjust the second power control parameter according to the second balanced power amount to cooperate with the power generation equipment to perform its own power control.

[0098] It should be noted that the second balanced power amount can effectively utilize the surplus power of the power generation equipment, that is, the surplus power generation. The second balanced power amount can be positively correlated with the surplus power generation of the power generation equipment, and the surplus power generation can be determined according to the current power generation status of the power generation equipment.

[0099] It can be understood that the remaining generated power is the remaining generated power after the power generation equipment meets the power consumption of load 140 (when connected to 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 equipment 120.

[0100] In actual implementation, the power generation equipment can adopt maximum power tracking control. According to the maximum power tracking state, the corresponding remaining power generation can be predicted. The second balanced power amount is calculated through the remaining power generation. The second power control parameter is adjusted through the second balanced power amount to output the remaining power generation or consume the remaining power generation, thereby improving the power generation utilization rate.

[0101] 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 charge state balanced 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.

[0102] The power supply system of the embodiment of the present application can support power distribution in single-phase, three-phase three-wire and three-phase four-wire mixed scenarios. The power control is performed from the single-phase, three-phase three-wire and three-phase four-wire power supply equipment 120 respectively, and the embodiment of the present application is specifically described below.

[0103] 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 connected to the power supply device 120 based on the corresponding first power control parameter connected to the power supply device 120 and the device capacity information of the power supply device 120 itself.

[0104] In this embodiment, the single-phase power supply device 120 determines the phase to which it is connected, obtains the first power control parameter corresponding to the phase to which it is connected from the received first power control parameter, and obtains the second power control parameter corresponding to the phase to which it is connected in combination with the device capacity information of the power supply device 120 itself to perform power control.

[0105] For example, the phase connected to the single-phase power supply device 120 is phase A. The power supply device 120 obtains the first power control parameter P1a_pu corresponding to phase A, and calculates the second power control parameter P1_local= P1a_pu *Pa_inv_local according to the device capacity information Pa_inv_local of the power supply device 120 itself.

[0106] A specific embodiment is described below.

[0107] like Figure 4 As shown, the single-phase power supply device 120 determines the phase to which it is connected, and calculates the second power control parameter P1_local of the corresponding phase according to its own device capacity information.

[0108] The first balanced power amount ΔP1 is calculated according to the charge state balance reference value Bsoc and its own energy storage state, and the second balanced power amount ΔP2 is calculated according to its own power generation state, and added to P1_local as an adjustment amount to obtain the final parameter P=P1_local+ΔP1+ΔP2 for power control.

[0109] In some embodiments, the power supply device 120 is a three-phase three-wire power supply device, and 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, and each third power control parameter corresponds to an access phase of the power supply device 120.

[0110] In this embodiment, for the three-phase three-wire power supply device 120, three third power control parameters (corresponding to the three access phases of the power supply device 120) can be calculated based on the first power control parameter issued by the first controller 110 and combined with its own equipment capacity information. Based on the three third power control parameters, a second power control parameter of the power supply device 120 is determined, and the power of the power supply device 120 is controlled by this second power control parameter.

[0111] It should be noted that the equipment capacity information of the three-phase three-wire power supply equipment 120 may include the rated capacities corresponding to the three accesses, and the rated capacities of the various access phases may be equal.

[0112] For example, the rated capacities of the A phase, B phase, and C phase connected to the power supply device 120 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 sent by the first controller 110 .

[0113] According to the access corresponding relationship, the third power control parameters of the power supply device 120 accessing phase A, phase B and phase C are calculated, which are: P1a_local=P1a_pu*Pa_inv_local; P1b_local=P1b_pu*Pb_inv_local; P1c_local=P1c_pu*Pc_inv_local.

[0114] In this embodiment, a second power control parameter P1_local of the power supply device 120 is calculated according to P1a_local, P1b_local, and P1c_local.

[0115] In actual implementation, the second power control parameter of the power supply device 120 may be obtained by taking a smaller value, taking a larger value, or calculating an average value according to the three third power control parameters.

[0116] 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 three-phase three-wire power supply equipment 120 can use the average value of three third power control parameters as the second power control parameter.

[0117] When the first controller 110 calculates the first power control parameter according to the grid connection point power at the grid connection point, the three-phase three-wire power supply device 120 can use the minimum value or average value of the three third power control parameters as the second power control parameter.

[0118] In some embodiments, the power supply device 120 is configured to use a minimum value among three third power control parameters as the second power control parameter.

[0119] In this embodiment, the power supply device 120 performs a minimum processing on the three third power control parameters, determines the minimum value among the three third power control parameters, and uses the minimum value as the second power control parameter. The minimum processing can make the three-phase three-wire power supply device 120 carry the minimum load power of each phase, and can avoid the situation where the phase with smaller load power is connected to the grid during transient state. It is suitable for the three-phase independent backflow protection scenario of the three-phase three-wire power supply device 120.

[0120] In some embodiments, the power supply device 120 is configured to use an average value of three third power control parameters as the second power control parameter.

[0121] In this embodiment, the power supply device 120 averages the three third power control parameters, determines the average value of the three third power control parameters, and uses the average value as the second power control parameter. The averaging process can balance the load power of each phase of the three-phase three-wire power supply device 120, which is suitable for the total power backflow prevention scenario of the three-phase three-wire power supply device 120.

[0122] A specific embodiment is described below.

[0123] like Figure 5 As shown, the three-phase three-wire power supply device 120 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 smaller of them to obtain the second power control parameter P1_local.

[0124] Among them, P1_local is the minimum value of P1a_local, P1b_local, and P1c_local.

[0125] The first balanced power amount ΔP1 is calculated according to the charge state balance reference value Bsoc and its own energy storage state, and the second balanced power amount ΔP2 is calculated according to its own power generation state, and added to P1_local as an adjustment amount to obtain the final parameter P=P1_local+ΔP1+ΔP2 for power control.

[0126] It is understandable 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.

[0127] In some embodiments, the power supply device 120 is a three-phase four-wire power supply device, and the power supply device 120 is used 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.

[0128] In actual implementation, when the three-phase four-wire power supply device 120 receives the first power control parameters of each phase issued by the first controller 110, the power supply device 120 determines the second power control parameters of each phase of the power supply device 120 based on the first power control parameters of each phase and the equipment capacity information of the power supply device 120 itself, and performs independent power control on each phase according to the second power control parameters of each phase.

[0129] For example, for a three-phase four-wire power supply device 120, based on the first power control parameters of the three phases issued by the first controller 110 and combined with its own equipment capacity information, the second power control parameters corresponding to the three phases can be calculated, and each phase connected to the power supply device 120 performs power control according to its corresponding second power control parameters.

[0130] It can be understood that by controlling each phase of the three-phase four-wire power supply device 120 separately, the power supply device 120 can effectively control the zero-sequence component and drive the unbalanced load.

[0131] For example, the rated capacities of the A phase, B phase, and C phase connected to the power supply device 120 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 sent by the first controller 110 .

[0132] According to the access corresponding relationship, the second power control parameters of the power supply device 120 accessing phase A, phase B and phase C are calculated, 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.

[0133] A specific embodiment is described below.

[0134] like Figure 6 As shown, the three-phase four-wire power supply device 120 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 equipment capacity, and calculates the second power control parameters P1a_local, P1b_local, P1c_local of the three phases.

[0135] The first balanced power ΔP1 is calculated according to Bsoc and its own energy storage status, and the second balanced power ΔP2 is calculated according to its own power generation status. P1a_local, P1b_local, and P1c_local are added as adjustment quantities to obtain the final parameters Pa=P1_local+ΔP1+ΔP2, Pb=P1b_local+ΔP1+ΔP2, and Pc=P1c_local+ΔP1+ΔP2 for power control.

[0136] It should be noted that when the power supply system includes single-phase, three-phase three-wire and three-phase four-wire power supply equipment 120, the first power control parameter is issued through the first controller 110, and each power supply equipment 120 restores its own second power control parameter. The single-phase power supply equipment 120 determines the corresponding second power control parameter connected, the three-phase three-wire power supply equipment 120 determines the second power control parameter by taking the minimum or average processing, and the three-phase four-wire power supply equipment 120 determines the second power control parameter corresponding to each connection. In the transient state, the power supply system is powered by the three-phase three-wire power supply equipment 120 to supply power to the three-phase minimum load 140, and the power required for the remaining loads 140 is provided by the single-phase and three-phase four-wire power supply equipment 120.

[0137] In some embodiments, the first controller 110 may be an external controller independent of each power supply device 120 .

[0138] For example, Figure 1 As shown, the first controller 110 is an independent controller, and the first controller 110 is communicatively connected to each power supply device 120 of the power supply system (as shown by the dotted lines). The first controller 110 sends a first power control parameter and a charge state balancing reference value to each power supply device 120 .

[0139] In some embodiments, the first controller 110 is a control unit on the power supply device 120 .

[0140] In this embodiment, the power supply device 120 where the first controller 110 is located can serve as the host in the power supply system, and the other power supply devices 120 can serve as slaves. The host can perform power scheduling on each slave and the host itself to improve the stability of the power supply system operation.

[0141] For example, Figure 2 As 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 with each power supply device 120 of the power supply system (as shown by the dotted line), and each power supply device 120 is electrically connected in parallel (as shown by the solid line). The first controller 110 sends a first power control parameter and a charge state balancing reference value to each power supply device 120.

[0142] The power supply system of the embodiment of the present application proposes a power allocation 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 macro power allocation, and each power supply device 120 performs local adaptive adjustment based on the instructions issued by the first controller 110. It can fully utilize the zero-sequence output capability of the three-phase four-wire power supply device 120 in the power supply system and the single-phase adjustment capability of the single-phase power supply device 120, while achieving independent control of the power of each phase of the power supply system, maximizing the utilization of the generated power, and regulating the balance of available capacity between the power supply devices 120, so as to achieve the compatibility of economy and compliance.

[0143] Some specific embodiments are described below.

[0144] 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 A, B, and C three-phase powers of the load 140 are 1kw, 2kw, and 3kw respectively. The power supply system includes a mixed connection of three-phase three-wire and three-phase four-wire power supply equipment 120.

[0145] Among them, the rated capacity of the three-phase four-wire power supply equipment 120 is 20kw, the maximum photovoltaic power is 0kw, the energy storage battery capacity is 10kwh, and the charge state is 50%.

[0146] The rated capacity of the three-phase three-wire power supply device 120 is 20kw, the maximum photovoltaic power is 9kw, the battery capacity of the energy storage is 10kwh, and the state of charge is 50%.

[0147] In some embodiments, the first controller 110 calculates the first power control parameter that can satisfy the operation of the load 140 according to the grid connection point power of each phase: P1a_pu=1kw / (40kw / 3)=0.075; P1b_pu=2kw / (40kw / 3)=0.15; P1c_pu=3kw / (40kw / 3)=0.225.

[0148] And calculate the charge state balance reference value Bsoc=Pbat / Cavail, Pbat is determined according to the current total charge and discharge state of energy storage, such as Pbat=1.5kw (charging).

[0149] In this embodiment, the three-phase three-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: P1a_local=P1a_pu*Pa_inv_local=0.5kw; P1b_local=P1b_pu*Pb_inv_local=1.0kw; P1c_local=P1c_pu*Pc_inv_local=1.5kw; The smaller of P1a_local, P1b_local and P1c_local is taken to obtain the second power control parameter P1_local=0.5 kw.

[0150] It is understandable that the average value of P1a_local, P1b_local and P1c_local may be taken to obtain the second power control parameter P1_local=1.0kw.

[0151] The three-phase three-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0152] Through ΔP1 and ΔP2, P1_local=0.5 kw is adjusted to obtain the final parameter P=P1_local+ΔP1+ΔP2=2.5 kw for power control.

[0153] 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: P1a_local=P1a_pu*Pa_inv_local=0.5kw; P1b_local=P1b_pu*Pb_inv_local=1.0kw; P1c_local=P1c_pu*Pc_inv_local=1.5kw.

[0154] The three-phase four-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0155] Through ΔP1 and ΔP2, P1a_local, P1b_local, and P1c_local are adjusted to obtain the following parameters for power control: Pa=P1a_local+ΔP1+ΔP2=-1.5kw; Pb=P1b_local+ΔP1+ΔP2=-0.5kw; Pc=P1c_local+ΔP1+ΔP2=0.5kw.

[0156] 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=1kw+2kw+3kw=6kw at the grid connection point: P1a_pu=(6kw / 3) / (40kw / 3)= 0.15; P1b_pu=(6kw / 3) / (40kw / 3)= 0.15; P1c_pu=(6kw / 3) / (40kw / 3)= 0.15.

[0157] And calculate the charge state balance reference value Bsoc=Pbat / Cavail.

[0158] In this embodiment, the three-phase three-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: P1a_local=P1a_pu*Pa_inv_local=1.0kw; P1b_local=P1b_pu*Pb_inv_local=1.0kw; P1c_local=P1c_pu*Pc_inv_local=1.0kw; The smaller of P1a_local, P1b_local and P1c_local is taken to obtain the second power control parameter P1_local=1.0kw.

[0159] It is understandable that an average value of P1a_local, P1b_local, and P1c_local may be taken to obtain the second power control parameter P1_local=0.5 kw.

[0160] The three-phase three-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0161] Through ΔP1 and ΔP2, P1_local=1.0 kw is adjusted to obtain the final parameter P=P1_local+ΔP1+ΔP2=3kw for power control.

[0162] 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: P1a_local=P1a_pu*Pa_inv_local=1.0kw; P1b_local=P1b_pu*Pb_inv_local=1.0kw; P1c_local=P1c_pu*Pc_inv_local=1.0kw.

[0163] Through ΔP1 and ΔP2, P1a_local, P1b_local, and P1c_local are adjusted to obtain the following parameters for power control: Pa=P1a_local+ΔP1+ΔP2=-0.5kw; Pb=P1b_local+ΔP1+ΔP2=-0.5kw; Pc=P1c_local+ΔP1+ΔP2=-0.5kw.

[0164] 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 A, B, and C three-phase power of the load 140 are 1kw, 2kw, and 3kw respectively, and the power supply system includes a mixed connection of single-phase, three-phase three-wire, and three-phase four-wire power supply equipment 120.

[0165] Among them, the single-phase power supply equipment 120 is connected to phase B, the rated capacity is 5kw, the maximum photovoltaic power is 0kw, the energy storage battery capacity is 5kwh, and the charge state is 50%.

[0166] The rated capacity of the three-phase four-wire power supply device 120 is 20kw, the maximum photovoltaic power is 0kw, the energy storage battery capacity is 10kwh, and the state of charge is 50%.

[0167] The rated capacity of the three-phase three-wire power supply device 120 is 10kw, the maximum photovoltaic power is 0kw, the energy storage battery capacity is 8kwh, and the state of charge is 30%.

[0168] In some embodiments, the first controller 110 calculates the first power control parameter that can satisfy the operation of the load 140 according to the grid connection point power of each phase: P1a_pu=1kw / (30kw / 3)=0.10; P1b_pu=2kw / (30kw / 3+5kw)=0.133; P1c_pu=3kw / (30kw / 3)=0.3.

[0169] And calculate the charge state balance reference value Bsoc=Pbat / Call, Pbat is determined according to the current total charge and discharge state of energy storage, such as Pbat=1.5kw (charging).

[0170] In this embodiment, the three-phase three-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: P1a_local=P1a_pu*Pa_inv_local=0.33kw; P1b_local=P1b_pu*Pb_inv_local=0.44kw; P1c_local=P1c_pu*Pc_inv_local=1kw; The smaller of P1a_local, P1b_local and P1c_local is taken to obtain the second power control parameter P1_local=0.33kw.

[0171] It is understandable that P1a_local, P1b_local, and P1c_local may be averaged to obtain the second power control parameter P1_local=0.59kw.

[0172] The three-phase three-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0173] Taking the smaller value P1_local=0.33kw as an example, P1_local is adjusted by ΔP1 and ΔP2 to obtain the final parameter P=P1_local+ΔP1+ΔP2=0.48kw for power control.

[0174] 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: P1a_local=P1a_pu*Pa_inv_local=0.66kw; P1b_local=P1b_pu*Pb_inv_local=0.88kw; P1c_local=P1c_pu*Pc_inv_local=2kw.

[0175] The three-phase four-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0176] Through ΔP1 and ΔP2, P1a_local, P1b_local, and P1c_local are adjusted to obtain the following parameters for power control: Pa=P1a_local+ΔP1+ΔP2=0.52kw; Pb=P1b_local+ΔP1+ΔP2=0.02kw; Pc=P1c_local+ΔP1+ΔP2=2.52kw.

[0177] In this embodiment, the single-phase power supply device 120 receives the above instruction, and restores to the second power control parameter P1_local=P1b_pu*Pb_inv_local=0.66kw according to the corresponding power parameters of its own access and its own equipment capacity, and adjusts P1_local through ΔP1 and ΔP2 to obtain the final parameter P=P1_local+ΔP1+ΔP2=1.5kw for power control.

[0178] 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=1kw+2kw+3kw=6kw at the grid connection point: P1a_pu=(6kw / 3) / (20kw / 3+10 kw / 3)= 0.2; P1b_pu=(6kw / 3) / (20kw / 3+10kw / 3+5kw)= 0.13; P1c_pu=(6kw / 3) / (20kw / 3+10kw / 3)= 0.2.

[0179] And calculate the charge state balance reference value Bsoc=Pbat / Cavail.

[0180] In this embodiment, the three-phase three-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: P1a_local=P1a_pu*Pa_inv_local=0.66kw; P1b_local=P1b_pu*Pb_inv_local=0.44kw; P1c_local=P1c_pu*Pc_inv_local=0.66kw; The smaller of P1a_local, P1b_local and P1c_local is taken to obtain the second power control parameter P1_local=0.44kw.

[0181] It is understandable that an average value may be taken for P1a_local, P1b_local, and P1c_local to obtain the second power control parameter P1_local=0.58 kw.

[0182] The three-phase three-wire power supply device 120 calculates a first balanced power amount ΔP1 and a second balanced power amount ΔP2 according to Bsoc, its own energy storage state, and its own power generation state.

[0183] Taking the minimum value P1_local=0.44kw as an example, P1_local=1.0 kw is adjusted through ΔP1 and ΔP2 to obtain the final parameter P=P1_local+ΔP1+ΔP2=0.48kw for power control.

[0184] 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: P1a_local=P1a_pu*Pa_inv_local=1.32kw; P1b_local=P1b_pu*Pb_inv_local=0.88kw; P1c_local=P1c_pu*Pc_inv_local=1.32kw.

[0185] Through ΔP1 and ΔP2, P1a_local, P1b_local, and P1c_local are adjusted to obtain the following parameters for power control: Pa=P1a_local+ΔP1+ΔP2=1.17kw; Pb=P1b_local+ΔP1+ΔP2=0.69kw; Pc=P1c_local+ΔP1+ΔP2=1.17kw.

[0186] In this embodiment, the single-phase power supply device 120 receives the above instruction, and according to the corresponding power parameter connected and its own equipment capacity, it is restored to the second power control parameter P1_local=P1b_pu*Pb_inv_local=0.66kw, and P1_local is adjusted through ΔP1 and ΔP2 to obtain the final parameter P=P1_local+ΔP1+ΔP2=1.52kw for power control. For the scenario of hybrid scene access to unbalanced load, 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, and the inherent characteristics of each power supply device 120 are adapted, which can improve the control stability of the hybrid scene, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0187] An embodiment of the present application also provides a control method for a power supply system, which can be used in the power supply system as described above.

[0188] 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 . The control method of the power supply system is applied to the first controller 110 .

[0189] The execution subject of the control method of the power supply system may be an electronic device or a functional module or functional entity in the electronic device that can implement the control method of the power supply system.

[0190] like Figure 7 As shown, the control method of the power supply system applied to the first controller 110 includes step 710 , step 720 and step 730 .

[0191] Step 710: Obtain the power of the grid connection point where the power supply system is connected to the power grid 150.

[0192] In this step, the first controller 110 may obtain the power of the grid connection point where the power supply system is connected to the power grid 150 in real time.

[0193] Step 720: Determine a first power control parameter of the power supply system based on the grid connection point power.

[0194] The power information at the grid connection point where the power supply system is connected to the power grid 150 reflects the power flow between the power supply system and the power grid 150. The power information that needs to be adjusted by the power supply system can be obtained through the grid connection point power at which the power supply system is connected to the power grid 150. The first power control parameter is determined by the grid connection point power for control, so as to maintain the stability and balance at the grid connection point.

[0195] Step 730 : Send the first power control parameter to at least two power supply devices 120 .

[0196] The first controller 110 sends the first power control parameter to at least two power supply devices 120, so that the power supply device 120 determines 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, and performs power control based on the second power control parameter.

[0197] In this embodiment, the power supply device 120 receives the first power control parameter sent by the first controller 110, determines its own second power control parameter for adjusting and controlling power output based on the first power control parameter and the equipment capacity information of the power supply device 120 itself, and performs its own power control according to the second power control parameter.

[0198] According to the control method of the power supply system provided in the embodiment of the present application, the first controller 110 performs macro power allocation according to the grid connection point power, and each power supply device 120 performs local adaptive adjustment according to its own equipment capacity information on the basis of the first power control parameter issued by the first controller 110. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various power supply devices 120, and achieve the compatibility of economy and compliance.

[0199] 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: Determine a charge state balance reference value based on the current energy storage power and the current chargeable and dischargeable capacity of the energy storage system; The state of charge balancing reference value is sent to at least two power supply devices 120, so that the power supply device 120 connected to the energy storage device determines a first balancing power amount based on the energy storage rated capacity, the current state of charge and the state of charge balancing reference value of the energy storage device, and adjusts the second power control parameter based on the first balancing power amount.

[0200] The current chargeable and dischargeable amount of the energy storage system is determined based on the energy storage rated capacity and the current state of charge of the energy storage system, or the current chargeable and dischargeable amount of the energy storage system is determined based on the current chargeable and dischargeable amount of each energy storage device. In this embodiment, the first controller 110 calculates the charge state balance reference value of the power supply system according to the current energy storage power and the current chargeable and dischargeable amount of the energy storage system, and performs macroscopic balance control.

[0201] The power supply device 120 connected to the energy storage device receives the charge state balancing reference value. The power supply device 120 performs local adaptive adjustment according to the energy storage rated capacity of the connected energy storage device, the current charge state and the received charge state balancing reference value to obtain a first balanced power amount, adjusts the second power control parameter according to the first balanced power amount, and cooperates with the energy storage device to perform its own power control.

[0202] In some embodiments, determining a first power control parameter of the power supply system based on the grid connection point power may include: Based on the grid connection point power, determine a first target power corresponding to the load of the power supply system; A first power control parameter is determined based on the rated capacity information of the power supply system and the first target power.

[0203] In this embodiment, based on the current grid-connected point power, with the goal of achieving a balanced state between the power consumption of load 140 and the power generation of the equipment (the grid-connected point power is controlled to 0), a first target power that satisfies the load operation of the power supply system is obtained, and the first power control parameter is determined in combination with the rated capacity information of the power supply system.

[0204] An embodiment of the present application also provides a control method for a power supply system, which can be used in the power supply system as described above.

[0205] 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 . The control method of the power supply system is applied to the power supply devices 120 .

[0206] The execution subject of the control method of the power supply system may be an electronic device or a functional module or functional entity in the electronic device that can implement the control method of the power supply system.

[0207] like Figure 8 As shown, the control method of the power supply system applied to the power supply device 120 includes step 810 , step 820 and step 830 .

[0208] Step 810 : Receive a first power control parameter sent by the first controller 110 .

[0209] 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 grid 150.

[0210] 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.

[0211] Step 820 : 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.

[0212] Step 830: Perform power control based on the second power control parameter.

[0213] According to the control method of the power supply system provided in the embodiment of the present application, the first controller 110 performs macro power allocation according to the grid connection point power, and the power supply equipment 120 performs local adaptive adjustment according to its own equipment capacity information on the basis of the first power control parameter issued by the first controller 110. This can improve the control stability of the hybrid scenario, take into account the control characteristics of various types of power supply equipment 120, and achieve the compatibility of economy and compliance.

[0214] In some embodiments, the power supply device 120 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 120 and the device capacity information of the power supply device 120 itself, the second power control parameter corresponding to the power supply device 120 is determined.

[0215] 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 by the following steps: Based on the first power control parameter and the device capacity information of the power supply device 120 itself, three third power control parameters are determined, each of which corresponds to an access phase of the power supply device 120; Based on the three third power control parameters, a second power control parameter is determined.

[0216] In some embodiments, determining the second power control parameter based on three third power control parameters includes: The minimum value of the three third power control parameters is used as the second power control parameter.

[0217] In some embodiments, the power supply device 120 is a three-phase four-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 120 itself, a second power control parameter of the power supply device 120 is determined.

[0218] 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, the power supply device 120 is connected to the energy storage device, and before performing power control based on the second power control parameter, the control method of the power supply system further includes: Receiving a state of charge balancing reference value sent by the first controller 110, where 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, the current state of charge, and the state of charge balancing reference value of the energy storage device; A second power control parameter is adjusted based on the first balanced power amount.

[0219] 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, the power supply device 120 is connected to the power generation device, and before performing power control based on the second power control parameter, the control method of the power supply system further includes: determining a second balancing power amount based on a current power generation state of the power generation equipment; A second power control parameter is adjusted based on the second balanced power amount.

[0220] In some embodiments, Fig. 9 As shown, an embodiment of the present application also provides an electronic device 900, including a processor 901, a memory 902, and a computer program stored in the memory 902 and executable on the processor 901. When the program is executed by the processor 901, each process of the control method embodiment of the above-mentioned power supply system is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0221] It should be noted that the electronic devices in the embodiments of the present application include the mobile electronic devices and non-mobile electronic devices mentioned above.

[0222] An 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, the various processes of the control method embodiment of the above-mentioned power supply system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0223] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0224] An embodiment of the present application also provides a computer program product, including a computer program, which implements the control method of the power supply system when executed by a processor.

[0225] The processor is the processor in the electronic device described in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer read-only memory ROM, a random access memory RAM, a magnetic disk or an optical disk.

[0226] An embodiment of the present application further provides a chip, which includes a processor and a communication interface, wherein the communication interface is coupled to the processor, and the processor is used to run programs or instructions to implement the various processes of the control method embodiment of the above-mentioned power supply system, and can achieve the same technical effect. To avoid repetition, it will not be repeated here.

[0227] It should be understood that the chip mentioned in the embodiments of the present application can also be called a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0228] It should be noted that, in this article, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise one..." do not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be pointed out that the scope of the methods and devices in the embodiments of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

[0229] Through the description of the above implementation methods, those skilled in the art can clearly understand that the above-mentioned embodiment methods can be implemented by means of software plus a necessary general hardware platform, and of course 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, or the part that contributes to the prior art, can be embodied in the form of a computer software product, which is stored in a storage medium (such as ROM / RAM, a magnetic disk, or an optical disk), and includes a number of instructions for enabling a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present application.

[0230] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

[0231] 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" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0232] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that 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.

2. The power supply system according to claim 1, characterized in that: 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, current state of charge and the state of charge balancing reference value of the energy storage device, and adjust the second power control parameter based on the first balanced power amount.

3. The power supply system according to claim 2, 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.

4. 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.

5. 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.

6. 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.

7. The power supply system according to claim 6, 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.

8. The power supply system according to claim 6, 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.

9. 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.

10. The power supply system according to any one of claims 1 to 9, 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.

11. The power supply system according to any one of claims 1 to 9, 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.

12. 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; The first power control parameter is sent to the at least two power supply devices, so that the power supply devices determine their second power control parameters based on the first power control parameter and their own device capacity information, and perform power control based on the second power control parameter.

13. The control method of the power supply system according to claim 12, characterized in that: 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; The state of charge balancing reference value is sent 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, the current state of charge and the state of charge balancing reference value of the energy storage device, and adjusts the second power control parameter based on the first balancing power amount.

14. The control method of the power supply system according to claim 12 or 13, characterized in that: The determining, based on the grid connection point power, a first power control parameter of the power supply system includes: 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.

15. 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; Power control is performed based on the second power control parameter.

16. The control method of the power supply system according to claim 15, 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.

17. The control method of the power supply system according to claim 15, 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.

18. The control method of the power supply system according to claim 17, 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.

19. The control method of the power supply system according to claim 15, 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.

20. The control method of the power supply system according to any one of claims 15 to 19, characterized in that: 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; The second power control parameter is adjusted based on the first balanced power amount.

21. The control method of the power supply system according to any one of claims 15 to 19, 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.

22. 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 12-21 is implemented.

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