Control method and device of power supply system and power supply system

Abstract

The invention discloses a control method and device of a power supply system and the power supply system, and belongs to the technical field of power supply. The control method of the power supply system comprises the steps that the current charge state and the current charge and discharge power of an energy storage device connected with the first power supply equipment are acquired; executing a target control strategy under the condition that the current charge state exceeds a target charge state range or the current charge and discharge power exceeds a target power range; wherein the execution of the target control strategy comprises: controlling the frequency of the first power supply device; or, controlling the disconnection of the contactor connected with the second power supply equipment, so as to enable the second power supply equipment to be disconnected from the coupling point. According to the method, energy management of multi-party power supply equipment can be realized without establishing communication, and stable operation of a power supply system is ensured.

Description

Technical Field

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

[0002] For new energy grid-connected projects that have been put into operation, you can add photovoltaic storage or energy storage systems to the original equipment to build a microgrid to achieve maximum self-generation and self-use. Multiple inverters and other power supply equipment in the microgrid may come from different manufacturers or belong to different models. There are difficulties in changing lines and incompatible communication protocols, making it difficult to build a system communication network. At the same time, the system may have excess power generation and excessive charging and discharging power, resulting in system control instability.

[0003] How to achieve energy management of multiple power supply devices without establishing communications and ensure smooth operation of the system is a technical problem that urgently needs to be solved in this field. 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 control method, device and power supply system of a power supply system, which can realize energy management of multiple power supply devices without establishing communication and ensure the smooth operation of the power supply system.

[0005] In a first aspect, the present application provides a control method for a power supply system, the power supply system comprising a first power supply device and a second power supply device, the first power supply device being connected to an energy storage device, the first power supply device and the second power supply device being connected at a coupling point, the control method comprising: Obtaining a current state of charge and a current charging and discharging power of an energy storage device connected to the first power supply device; When the current state of charge exceeds the target state of charge range, or the current charge and discharge power exceeds the target power range, executing the target control strategy; Wherein, the execution target control strategy includes: controlling the frequency of the first power supply device; Alternatively, the contactor connected to the second power supply device is controlled to be disconnected so that the second power supply device is disconnected from the coupling point.

[0006] According to the control method of the power supply system of the present application, by monitoring the current state of charge and the current charge and discharge power in real time, if the current state of charge or the current charge and discharge power exceeds the normal working range, the target control strategy is executed. This can realize energy management of multiple power supply devices without establishing communication, thereby ensuring the smooth operation of the power supply system.

[0007] According to an embodiment of the present application, when the current state of charge exceeds the target state of charge range, executing the target control strategy includes: Determining a frequency adjustment amount based on the current state of charge; Based on the frequency adjustment amount, the frequency of the first power supply device is adjusted.

[0008] According to an embodiment of the present application, adjusting the frequency of the first power supply device based on the frequency adjustment amount includes: When the current state of charge is greater than a maximum value of the target state of charge range, based on the frequency adjustment amount, raising the frequency of the first power supply device so that the second power supply device automatically operates at a reduced rating; Wherein, when the frequency of the first power supply device is greater than the over-frequency protection threshold, the second power supply device automatically stops running.

[0009] According to an embodiment of the present application, adjusting the frequency of the first power supply device based on the frequency adjustment amount includes: When the current state of charge is less than a minimum value of the target state of charge range, based on the frequency adjustment amount, reducing the frequency of the first power supply device so that the second power supply device automatically increases output power; Wherein, when the frequency of the first power supply device is lower than an under-frequency protection threshold, the second power supply device automatically stops running.

[0010] According to one embodiment of the present application, the frequency of the first power supply device is positively correlated with the current state of charge.

[0011] According to an embodiment of the present application, when the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is greater than a maximum value of the target state of charge range, the contactor connected to the second power supply device connected to the power generation device is controlled to be disconnected.

[0012] According to an embodiment of the present application, when the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is less than a minimum value of the target state of charge range, the contactor connected to the second power supply device connected to the energy storage device is controlled to be disconnected.

[0013] According to an embodiment of the present application, when the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device is connected to a contactor and the second power supply device is allowed to be switched off, the contactor connected to the second power supply device is controlled to be disconnected.

[0014] According to an embodiment of the present application, when the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device is not connected to a contactor, or the second power supply device is not allowed to be switched off, the voltage or frequency at the coupling point becomes abnormal, and the second power supply device automatically stops running.

[0015] According to one embodiment of the present application, before executing the target control strategy, the method further includes: Obtaining current coupling point parameters of the coupling point; The current coupling point parameter is used as a feedback value and the target coupling point parameter is used as a reference value to perform power control on the first power supply device.

[0016] In a second aspect, the present application provides a control device for a power supply system, the power supply system comprising a first power supply device and a second power supply device, the first power supply device being connected to an energy storage device, the first power supply device and the second power supply device being connected at a coupling point, the control device comprising: An acquisition module, used to acquire a current state of charge and a current charge and discharge power of an energy storage device connected to the first power supply device; A processing module, configured to execute a target control strategy when the current state of charge exceeds a target state of charge range, or when the current charge and discharge power exceeds a target power range; Wherein, the execution target control strategy includes: controlling the frequency of the first power supply device; Alternatively, the contactor connected to the second power supply device is controlled to be disconnected so that the second power supply device is disconnected from the coupling point.

[0017] According to the control device of the power supply system of the present application, by real-time monitoring of the current state of charge and the current charge and discharge power, if the current state of charge or the current charge and discharge power exceeds the normal working range, the target control strategy is executed. Therefore, energy management of multiple power supply devices can be achieved without establishing communication, thereby ensuring the smooth operation of the power supply system.

[0018] In a third aspect, the present application provides a power supply system, including: A first power supply device and a second power supply device, wherein the first power supply device is connected to an energy storage device, and the first power supply device and the second power supply device are connected to a coupling point; As in the control device of the power supply system described in the second aspect above, the control device is connected to the contactors connected to the first power supply device and the second power supply device.

[0019] 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 first aspect above is implemented.

[0020] 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 first aspect above is implemented.

[0021] 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 first aspect above.

[0022] 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

[0023] 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 flow charts of the control method of the power supply system provided in the embodiment of the present application; Figure 2 is a schematic diagram of the structure of the power supply system provided in an embodiment of the present application; Figure 3 This is a second flow chart of a control method for a power supply system provided in an embodiment of the present application; Figure 4 is a schematic diagram of the relationship between the state of charge and frequency of the power supply system provided in an embodiment of the present application; Figure 5 It is a schematic diagram of the relationship between the state of charge and the state of the contactor of the power supply system provided in an embodiment of the present application; Figure 6 is a schematic diagram of the relationship between the coupling point voltage and the contactor state of the power supply system provided in an embodiment of the present application; Figure 7 is a schematic diagram of the relationship between the coupling point frequency and the contactor state of the power supply system provided in an embodiment of the present application; Figure 8 is a schematic diagram of the structure of a control device for a power supply system provided in an embodiment of the present application; Fig. 9It is a schematic diagram of the structure of an electronic device provided in an embodiment of the present application.

[0024] Reference numerals: A first power supply device 210 , a second power supply device 220 , a first controller 310 , a second controller 320 , a main controller 400 , an energy storage device 510 , a power generation device 520 , a load 600 , an acquisition module 810 , a processing module 820 , an electronic device 900 , a processor 901 , and a memory 902 . DETAILED DESCRIPTION

[0025] 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.

[0026] The terms "first", "second", etc. in the specification and claims of this 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.

[0027] In the following, in combination with the accompanying drawings, the control method of the power supply system, the control device of the power supply system, the power supply system, the electronic device and the readable storage medium provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

[0028] The power supply system of the embodiment of the present application may include a first power supply device 210 and a second power supply device 220 . The first power supply device 210 is connected to an energy storage device 510 . The first power supply device 210 and the second power supply device 220 are connected at a coupling point.

[0029] The first power supply device 210 and the second power supply device 220 are two types of power supply devices.

[0030] The power supply equipment is used to realize power conversion between DC voltage and AC voltage. The power supply equipment can be an inverter, a converter and other equipment.

[0031] It can be understood that the power supply system may include multiple first power supply devices 210, and the power supply system may also include multiple second power supply devices 220, and the power supply system supports multiple machines in parallel.

[0032] The first power supply device 210 and the second power supply device 220 are connected to a coupling point, which is an electric energy aggregation point in the power supply system. The coupling point can be connected to a load 600, and the power supply system supplies power to the load 600. The coupling point can also be connected to a power grid, and the power supply system feeds power to the power grid through the coupling point.

[0033] The first power supply device 210 is connected to the energy storage device 510 . The first power supply device 210 can absorb electric energy through the coupling point, and the first power supply device 210 can also output electric energy through the coupling point.

[0034] The control method of the power supply system provided in the embodiment of the present application can be executed by 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.

[0035] It should be noted that no communication connection is established between the first power supply device 210 and the second power supply device 220 . The first power supply device 210 is a controllable power supply device, and the second power supply device 220 is an uncontrollable power supply device.

[0036] The second power supply device 220 may be connected to the power generation device 520 , may be connected to the energy storage device 510 , or may be connected to both the power generation device 520 and the energy storage device 510 .

[0037] For example, the second power supply device 220 may be a photovoltaic inverter, a pure energy storage inverter, or a photovoltaic energy storage inverter.

[0038] It is understandable that when the uncontrollable second power supply device 220 is connected to the power supply system, there may be problems such as excess power generation and excessive charging and discharging power, which may lead to system instability.

[0039] The control method of the power supply system provided in the embodiment of the present application can realize energy management of multiple power supply devices without establishing communication, thereby ensuring the smooth operation of the power supply system.

[0040] like Figure 1 As shown, the control method of the power supply system includes: step 110 and step 120.

[0041] Step 110 : Acquire the current state of charge and current charging and discharging power of the energy storage device 510 connected to the first power supply device 210 .

[0042] It can be understood that the current charge state of the energy storage device 510 connected to the first power supply device 210 can reflect the absorption capacity or output capacity of the first power supply device 210, and the current charge and discharge power corresponding to the first power supply device 210 can reflect the operating state of the first power supply device 210. Combined with the controllable absorption capacity, output capacity and operating state of the first power supply device 210, the stability of the power supply system operation can be judged.

[0043] In this step, the current state of charge of the energy storage device 510 connected to the first power supply device 210 and the current charge and discharge power corresponding to the first power supply device 210 are obtained in real time, and based on the current state of charge and the current charge and discharge power, it is determined whether the power supply system has an instability tendency or has already experienced instability.

[0044] It can be understood that when the power supply system includes multiple first power supply devices 210 running in parallel, the current charge state is determined according to the charge state of the energy storage device 510 connected to the multiple first power supply devices 210, and the current charge and discharge power is determined according to the charge and discharge power of the multiple first power supply devices 210.

[0045] It should be noted that the current charge and discharge power corresponding to the first power supply device 210 can be characterized by the voltage or frequency of the coupling point. If the current charge and discharge power changes, the voltage or frequency of the coupling point will change accordingly. The current charge and discharge power corresponding to the first power supply device 210 can be monitored in real time by acquiring the voltage or frequency of the coupling point in real time.

[0046] Step 120: When the current state of charge exceeds the target state of charge range, or the current charge and discharge power exceeds the target power range, execute the target control strategy.

[0047] The target state of charge range is a preset state of charge range of the energy storage device 510 when it is operating normally, and the target power range is a preset charging and discharging power range of the first power supply device 210 when it is operating normally.

[0048] In actual implementation, the target state of charge range and the target power range can be adjusted according to actual operating requirements.

[0049] In this step, if the current state of charge exceeds the target state of charge range, or the current charge and discharge power exceeds the target power range, it is determined that the power supply system is at risk of losing control, and the target control strategy is executed.

[0050] It is understandable that the current charging and discharging power exceeding the target power range may be manifested as the voltage at the coupling point exceeding the target voltage range for normal operation, or as the frequency at the coupling point exceeding the target frequency range for normal operation.

[0051] It should be noted that the current state of charge and the current charge and discharge power are monitored in real time, and when at least one of the current state of charge and the current charge and discharge power exceeds the corresponding normal operating range, the target control strategy is executed.

[0052] Among them, the implementation of the target control strategy includes: Controlling the frequency of the first power supply device 210; Alternatively, the contactor connected to the second power supply device 220 is controlled to be disconnected so that the second power supply device 220 is disconnected from the coupling point.

[0053] In this embodiment, energy management of multiple power supply devices can be achieved by controlling the frequency of the first power supply device 210 or by controlling the on / off of the contactor connected to the second power supply device 220, thereby improving the stability of the power supply system operation.

[0054] It can be understood that the first power supply device 210 and the second power supply device 220 are connected to a coupling point to control the frequency of the first power supply device 210. When the frequency of the first power supply device 210 changes, the voltage or frequency of the coupling point changes accordingly. For the second power supply device 220, the second power supply device 220 can monitor the voltage or frequency of the coupling point and perform active protection actions according to the voltage or frequency of the coupling point.

[0055] For example, the energy supply system has sufficient electric energy, and the current state of charge of the energy storage device 510 connected to the first power supply device 210 is greater than the maximum value of the target state of charge range, indicating that the state of charge of the energy storage device 510 connected to the first power supply device 210 is close to the charging critical value, and the first power supply device 210 cannot absorb the remaining power output by the second power supply device 220.

[0056] In this embodiment, the frequency of the first power supply device 210 is controlled to be raised, and the second power supply device 220 monitors that the voltage or frequency of the coupling point changes. The second power supply device 220 actively reduces the frequency, which can avoid the excess power output by the second power supply device 220 causing the coupling point to lose control, realize energy management of multiple power supply devices, and improve the stability of the power supply system operation.

[0057] It can be understood that the second power supply device 220 operates according to the control strategy set by itself. The embodiment of the present application will not directly control the action of the second power supply device 220 (that is, the second power supply device 220 is uncontrolled). The second power supply device 220 can monitor the voltage or frequency of the coupling point in real time, adjust its own output state, and realize its own safety protection function.

[0058] It should be noted that the contactor connected to the second power supply device 220 is a switching device that controls the electrical connection between the second power supply device 220 and the coupling point. When the contactor connected to the second power supply device 220 is disconnected, the electrical connection between the second power supply device 220 and the coupling point is disconnected. When the contactor connected to the second power supply device 220 is closed, the electrical connection between the second power supply device 220 and the coupling point is conducted.

[0059] For example, the energy supply system has sufficient electric energy, and the current state of charge of the energy storage device 510 connected to the first power supply device 210 is greater than the maximum value of the target state of charge range, indicating that the state of charge of the energy storage device 510 connected to the first power supply device 210 is close to the charging critical value, and the first power supply device 210 cannot absorb the remaining power output by the second power supply device 220.

[0060] In this embodiment, controlling the disconnection of the contactor connected to the second power supply device 220 can prevent the coupling point from being out of control due to the residual power output by the second power supply device 220, realize energy management of multiple power supply devices, and improve the stability of the power supply system operation.

[0061] It is understandable that when the power supply system is insufficient or the output of the second power supply device 220 is abnormal, the energy management of multiple power supply devices can be achieved by controlling the frequency of the first power supply device 210 or controlling the disconnection of the contactor connected to the second power supply device 220, thereby improving the stability of the power supply system operation.

[0062] In an embodiment of the present application, by real-time monitoring of the current state of charge and the current charge and discharge power, if the current state of charge or the current charge and discharge power exceeds the normal working range, a target control strategy is executed, and the frequency of the first power supply device 210 and the on and off of the contactor connected to the second power supply device 220 are controlled to achieve energy management of multiple power supply devices, thereby preventing the uncontrolled second power supply device 220 from causing system instability and effectively improving the stability of the power supply system operation.

[0063] According to the control method of the power supply system provided in the embodiment of the present application, by monitoring the current state of charge and the current charging and discharging power in real time, if the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed. This can achieve energy management of multiple power supply devices without establishing communication and ensure the smooth operation of the power supply system.

[0064] The following describes the embodiments of the present application in detail from two different implementation perspectives.

[0065] 1. Frequency modulation control.

[0066] In some embodiments, step 120, when the current state of charge exceeds the target state of charge range, executing the target control strategy may include: Determining a frequency adjustment amount based on the current state of charge; Based on the frequency adjustment amount, the frequency of the first power supply device 210 is adjusted.

[0067] It is understandable that when the first power supply device 210 operates normally, the frequency of the first power supply device 210 is maintained at a certain value or range, and the frequency adjustment amount is the change amount determined according to the current charge state to adjust the frequency of the first power supply device 210 for normal operation.

[0068] In this embodiment, the corresponding frequency adjustment amount may be calculated according to the current state of charge, and the frequency of the first power supply device 210 may be adjusted by the frequency adjustment amount corresponding to the current state of charge.

[0069] For example, the frequency of the first power supply device 210 is controlled according to the following formula: freq = f 0+Δ f in, freq represents the frequency of controlling the operation of the first power supply device 210, f 0 represents the frequency at which the first power supply device 210 operates normally, Δ f Indicates the frequency adjustment amount.

[0070] In this embodiment, Δ f=f a ( soc ), soc Indicates the current state of charge. f a ( soc ) represents the functional relationship between the current state of charge and the frequency adjustment amount.

[0071] In some embodiments, adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount may include: When the current state of charge is greater than a maximum value of the target state of charge range, the frequency of the first power supply device 210 is increased based on the frequency adjustment amount, so that the second power supply device 220 automatically operates at a reduced rating.

[0072] When the frequency of the first power supply device 210 is greater than the over-frequency protection threshold, the second power supply device 220 automatically stops running.

[0073] In this embodiment, the current state of charge is greater than the maximum value of the target state of charge range, indicating that the current state of charge exceeds the target state of charge range, and the energy storage device 510 connected to the first power supply device 210 has a lot of electrical energy, and the first power supply device 210 cannot absorb more electrical energy. At this time, the frequency of the first power supply device 210 is controlled to increase, and the voltage or frequency of the coupling point changes accordingly, which can be manifested as an overfrequency of the coupling point. The second power supply device 220 monitors the change of the coupling point and actively operates at an overfrequency and reduced rating.

[0074] It can be understood that by raising the frequency of the first power supply device 210, the second power supply device 220 is automatically derated, and the electric energy actively output by the second power supply device 220 to the coupling point is reduced, thereby effectively improving the stability of the power supply system operation.

[0075] In this embodiment, if the current state of charge further increases, the frequency of the first power supply device 210 will continue to rise.

[0076] In actual implementation, when the frequency of the first power supply device 210 is greater than the overfrequency protection threshold, the second power supply device 220 monitors that the frequency of the coupling point has reached its own overfrequency protection point, and the second power supply device 220 automatically stops running to achieve protective shutdown, thereby avoiding system instability caused by excess power of the second power supply device 220.

[0077] The over-frequency protection threshold is a preset frequency critical value, which can be set according to the over-frequency protection point of the second power supply device 220 itself.

[0078] In some embodiments, adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount may include: When the current state of charge is less than the minimum value of the target state of charge range, the frequency of the first power supply device 210 is reduced based on the frequency adjustment amount, so that the second power supply device 220 automatically increases the output power.

[0079] When the frequency of the first power supply device 210 is less than the under-frequency protection threshold, the second power supply device 220 automatically stops running.

[0080] In this embodiment, the current state of charge is less than the minimum value of the target state of charge range, indicating that the current state of charge exceeds the target state of charge range, and the energy storage device 510 connected to the first power supply device 210 has less electrical energy. At this time, the frequency of the first power supply device 210 is controlled to be reduced, and the voltage or frequency of the coupling point changes accordingly, which can be manifested as under-frequency of the coupling point. The second power supply device 220 monitors the change of the coupling point and actively operates at under-frequency and increased power, thereby realizing energy management between the two types of power supply devices in the power supply system and improving operational stability.

[0081] It can be understood that by reducing the frequency of the first power supply device 210, the second power supply device 220 automatically increases its power and operates, the second power supply device 220 actively outputs more electric energy to the coupling point, and the first power supply device 210 absorbs the electric energy at the coupling point, thereby improving the stability of energy storage and effectively improving the stability of the power supply system operation.

[0082] In this embodiment, if the current state of charge further decreases, the frequency of the first power supply device 210 will continue to decrease.

[0083] In actual implementation, when the frequency of the first power supply device 210 is less than the under-frequency protection threshold, the second power supply device 220 monitors that the frequency of the coupling point has reached its own under-frequency protection point, and the second power supply device 220 automatically stops running to achieve protective shutdown, thereby avoiding the coupling point from losing control due to large charging and discharging power, and improving the stability of the power supply system operation.

[0084] The under-frequency protection threshold is a preset frequency critical value, which can be set according to the under-frequency protection point of the second power supply device 220 itself.

[0085] In some embodiments, the frequency of the first power supply device 210 is positively correlated with the current state of charge.

[0086] In this embodiment, when the current state of charge exceeds the target state of charge range, the frequency of the first power supply device 210 is adjusted. The greater the current state of charge, the greater the frequency of the first power supply device 210, and the smaller the current state of charge, the smaller the frequency of the first power supply device 210.

[0087] It should be noted that the current state of charge is within the target state of charge range, and the frequency of the first power supply device 210 is maintained within a certain value or range.

[0088] When the current state of charge exceeds the target state of charge range, the frequency of the first power supply device 210 changes in a positive correlation with the current state of charge. By adjusting the frequency of the first power supply device 210, the second power supply device 220 automatically operates at a reduced rating or increased power. When the reduced rating operation and increased power operation cannot achieve a stable state, the frequency of the first power supply device 210 will be raised to the overfrequency protection threshold or lowered to the underfrequency protection threshold according to the current state of charge, so that the second power supply device 220 automatically shuts down for protection.

[0089] A specific embodiment is described below.

[0090] For example, Figure 4 As shown, soc 0 represents the median state of charge of the energy storage device 510 connected to the first power supply device 210, soc 0 can be set to 50%, soc1 indicates the maximum value of the target state of charge range, soc 2 indicates the minimum value of the target state of charge range.

[0091] in, soc 1 can be equal to the system charging critical value, soc 2 may be equal to the system discharge threshold value, and the charge threshold value and the discharge threshold value are related to the charge and discharge cut-off charge state of the energy storage device 510.

[0092] In this embodiment, soc 3 represents the system charging cut-off value, soc 4 represents the system discharge cut-off value, f 1. f 2 represents the frequency modulation range of the first power supply device 210 , which is related to the specified over-frequency and under-frequency thresholds of the power generation device 520 .

[0093] If the current state of charge exceeds the target state of charge range, freq = f 0+Δ f The operating frequency of the first power supply device 210 is controlled. The frequency of the first power supply device 210 is positively correlated with the current state of charge. As the current state of charge increases, the frequency of the first power supply device 210 increases accordingly. As the current state of charge decreases, the frequency of the first power supply device 210 decreases accordingly.

[0094] The current state of charge is greater than the maximum value of the target state of charge range soc 1, the frequency of the first power supply device 210 is controlled to rise, and the second power supply device 220 actively reduces the frequency, and the current state of charge further increases, so that the frequency of the first power supply device 210 reaches the overfrequency protection threshold f 1. The second power supply device 220 is actively shut down for protection to prevent the coupling point from being out of control due to excess power of the second power supply device 220.

[0095] The current state of charge is less than the minimum value of the target state of charge range soc 2, the frequency of the first power supply device 210 is controlled to decrease, and the second power supply device 220 actively increases power by under-frequency, and the current state of charge is further reduced, so that the frequency of the first power supply device 210 reaches the under-frequency protection threshold f 2. The second power supply device 220 actively shuts down for protection to avoid instability caused by excessive charging power at the coupling point.

[0096] 2. Contactor control.

[0097] In some embodiments, when the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is greater than a maximum value of the target state of charge range, the contactor connected to the second power supply device 220 connected to the power generation device 520 is controlled to be disconnected.

[0098] In this embodiment, the current state of charge is greater than the maximum value of the target state of charge range, indicating that the energy storage device 510 connected to the first power supply device 210 has a lot of electric energy and the first power supply device 210 cannot absorb more electric energy. At this time, the contactor connected to the second power supply device 220 connected to the power generation device 520 is controlled to be disconnected, thereby reducing the electric energy actively output by the second power supply device 220 to the coupling point, thereby effectively improving the stability of the power supply system operation.

[0099] In some embodiments, when the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is less than the minimum value of the target state of charge range, the contactor connected to the second power supply device 220 connected to the energy storage device 510 is controlled to be disconnected.

[0100] In this embodiment, the current state of charge is less than the minimum value of the target state of charge range, indicating that the energy storage device 510 connected to the first power supply device 210 has less electrical energy, and a large charging and discharging power may occur. At this time, the contactor connected to the second power supply device 220 connected to the energy storage device 510 is controlled to be disconnected to prevent the first power supply device 210 from excessively consuming the electrical energy of the second power supply device 220, protect the energy storage device 510 connected to the second power supply device 220, and improve the stability of the power supply system operation.

[0101] A specific embodiment is described below.

[0102] For example, Figure 5 As shown, soc 0 represents the median state of charge of the energy storage device 510 connected to the first power supply device 210, soc 0 can be set to 50%, soc 1 indicates the maximum value of the target state of charge range, soc 2 indicates the minimum value of the target state of charge range.

[0103] in, soc 1 can be equal to the system charging critical value, soc 2 may be equal to the system discharge threshold value, and the charge threshold value and the discharge threshold value are related to the charge and discharge cut-off charge state of the energy storage device 510.

[0104] In this embodiment, S Indicates the contactor status. S 1 means the contactor is closed. S 2 indicates that the contactor is open.

[0105] The current state of charge is greater than the maximum value of the target state of charge range soc 1, the contactor connected to the second power supply device 220 connected to the power generation device 520 is controlled to be disconnected; the current state of charge is less than the minimum value of the target state of charge range soc 2, the contactor connected to the second power supply device 220 connected to the energy storage device 510 is controlled to be disconnected to avoid the situation where the charge state of the controllable first power supply device 210 reaches a critical value and cannot operate stably.

[0106] In some embodiments, when the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device 220 is connected to a contactor and the second power supply device 220 is allowed to be switched off, the contactor connected to the second power supply device 220 is controlled to be disconnected.

[0107] In some embodiments, when the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device 220 is not connected to a contactor, or the second power supply device 220 is not allowed to be switched off, the voltage or frequency at the coupling point becomes abnormal, and the second power supply device 220 automatically stops running.

[0108] It should be noted that when the current charging and discharging power exceeds the target power range, the voltage or frequency at the coupling point will become abnormal due to the power demand that cannot be absorbed or met.

[0109] When the second power supply device 220 is connected to a contactor and the second power supply device 220 is allowed to be switched out, the contactor connected to the second power supply device 220 is controlled to be disconnected.

[0110] When the second power supply device 220 is not connected to a contactor or the second power supply device 220 is not allowed to be switched off, due to abnormal voltage or frequency at the coupling point, the second power supply device 220 actively performs voltage abnormality protection or frequency abnormality protection to suppress its own output.

[0111] In actual implementation, when the frequency of the coupling point reaches the underfrequency protection point or the overfrequency protection point, the second power supply device 220 can automatically stop running. When the voltage of the coupling point reaches the undervoltage protection point or the overvoltage protection point, the second power supply device 220 can also automatically stop running to avoid instability caused by excessive charging power at the coupling point.

[0112] A specific embodiment is described below.

[0113] In this embodiment, the voltage across the coupling point U PCC, frequency F pcc represents the current charging and discharging power corresponding to the first power supply device 210.

[0114] like Figure 6 As shown, S Indicates the contactor status. S 1 means the contactor is closed. S 2 indicates that the contactor is open.

[0115] When the current charge and discharge power is greater than the maximum value of the target power range, U pcc is greater than the overvoltage protection point U 1. Control the contactor connected to the second power supply device 220 to disconnect.

[0116] When the current charge and discharge power is less than the maximum value of the target power range, U pcc is less than the undervoltage protection point U 2. Control the contactor connected to the second power supply device 220 to disconnect.

[0117] like Figure 7 As shown, S Indicates the contactor status. S 1 means the contactor is closed. S 2 indicates that the contactor is open.

[0118] When the current charge and discharge power is greater than the maximum value of the target power range, F pcc is greater than the overfrequency protection point F 1. Control the contactor connected to the second power supply device 220 to disconnect.

[0119] When the current charge and discharge power is less than the maximum value of the target power range, F pcc is less than under-frequency protection point F 2. Control the contactor connected to the second power supply device 220 to disconnect.

[0120] In some embodiments, before executing the target control strategy, the control method of the power supply system may further include: Get the current coupling point parameters of the coupling point; The current coupling point parameter is used as a feedback value, and the target coupling point parameter is used as a reference value to perform power control on the first power supply device 210 .

[0121] In this embodiment, the current coupling point parameters of the coupling point are acquired in real time, and the preset target coupling point parameters are used as reference values ​​to perform closed-loop power control on the first power supply device 210, so as to achieve maximum self-generation and self-use of the system.

[0122] The coupling point parameter may be a coupling point voltage or a coupling point frequency.

[0123] For example, the current coupling point voltage of the coupling point is acquired in real time, and the preset target coupling point voltage is used as a reference value to perform closed-loop power control on the first power supply device 210 .

[0124] For another example, the current coupling point frequency of the coupling point is acquired in real time, and the preset target coupling point frequency is used as a reference value to perform closed-loop power control on the first power supply device 210 .

[0125] When the second power supply device 220 outputs excess electric energy to the coupling point on the basis of meeting its own electricity consumption, according to the law of conservation of energy, the voltage at the coupling point will increase accordingly. After the first power supply device 210 performs closed-loop power control with the target coupling point parameters as reference values, the first power supply device 210 can absorb the excess electric energy of the second power supply device 220, thereby realizing power management of multiple power supply devices in the power supply system. There is no need to establish communication with the second power supply device 220, and the second power supply device 220 can also participate in the energy scheduling of the power supply system.

[0126] The embodiment of the present application monitors parameters such as the current state of charge, coupling point voltage, coupling point frequency (the voltage or frequency of the coupling point can reflect the current charging and discharging power), and realizes power management of multiple power supply devices in the power supply system through a primary control strategy (closed-loop control) and a secondary control strategy (target control strategy).

[0127] Among them, the first-level control strategy can realize the energy scheduling of the second power supply device 220 and the maximum utilization of the generated power, and the second-level control strategy can avoid the instability of the power supply system caused by the uncontrolled second power supply device 220.

[0128] A specific embodiment is described below.

[0129] like Figure 3 As shown, the target coupling point voltage U Ref Or target coupling point frequency F Ref As the reference value, adjust the coupling point voltage to U Ref , or adjust the coupling point frequency to F Ref .

[0130] Monitor whether there is an abnormality in the voltage or frequency at the coupling point, that is, obtain the current charging and discharging power for judgment. When the voltage or frequency is abnormal (that is, the current charging and discharging power exceeds the target power range), if contactor control is selected, the contactor of the second power supply device 220 is controlled to be disconnected. If contactor control is not selected, the second power supply device 220 actively protects and shuts down.

[0131] Monitor whether the charge state of the controllable system (energy storage device 510 connected to the first power supply device 210) is close to the critical value. If it is not close to the critical value, it indicates that the current charge state is within the target charge state range, and the second power supply device 220 operates normally according to its own control strategy.

[0132] When it approaches the critical value, it indicates that the current state of charge exceeds the target state of charge range. If contactor control is selected, the current state of charge is adjusted according to the current state of charge. soc Control the contactor on and off. S=f b ( soc ) indicates the contactor is on and off soc The relationship between.

[0133] In actual execution, the current state of charge is greater than the maximum value of the target state of charge range. soc 1, the contactor connected to the second power supply device 220 connected to the power generation device 520 is controlled to be disconnected; the current state of charge is less than the minimum value of the target state of charge range soc 2, the contactor connected to the second power supply device 220 connected to the energy storage device 510 is controlled to be disconnected.

[0134] When the current state of charge exceeds the target state of charge range, soc Control frequency, freq = f 0+Δ f =f 0+ f a ( soc ) represents the frequency and soc The relationship between.

[0135] The current state of charge is greater than the maximum value of the target state of charge range soc 1, the frequency of the first power supply device 210 is controlled to rise, and the second power supply device 220 actively reduces the frequency, and the current state of charge further increases, so that the frequency of the first power supply device 210 reaches the overfrequency protection threshold f 1. The second power supply device 220 actively shuts down for protection.

[0136] The current state of charge is less than the minimum value of the target state of charge range soc 2, the frequency of the first power supply device 210 is controlled to decrease, and the second power supply device 220 actively increases power by under-frequency, and the current state of charge is further reduced, so that the frequency of the first power supply device 210 reaches the under-frequency protection threshold f 2. The second power supply device 220 actively shuts down for protection.

[0137] In this embodiment, by monitoring parameters such as the current state of charge, coupling point voltage, coupling point frequency, etc., the first-level control strategy and the second-level control strategy are executed to realize energy management of multiple power supply devices. While realizing the energy scheduling of the second power supply device 220 and the maximum utilization of the generated power, the instability of the power supply system caused by the uncontrolled second power supply device 220 can be avoided, and the stability of the power supply system operation can be effectively improved.

[0138] It should be noted that when the controllable first power supply device 210 reaches the maximum absorption capacity, that is, the current state of charge is too high or the charging power reaches the critical value, the remaining electric energy of the second power supply device 220 cannot be effectively absorbed. A secondary control strategy is adopted to avoid instability of the power supply system caused by the uncontrolled second power supply device 220.

[0139] In addition, when the current state of charge is too low or the discharge power reaches a critical value, a secondary control strategy is adopted to coordinate the output of the second power supply device 220 to prevent the second power supply device 220 from causing abnormal system voltage or frequency or further reduction of the state of charge.

[0140] The control method of the power supply system provided in the embodiment of the present application can be executed by a control device of the power supply system. In the embodiment of the present application, the control device of the power supply system provided in the embodiment of the present application is described by taking the control device of the power supply system executing the control method of the power supply system as an example.

[0141] An embodiment of the present application also provides a control device for a power supply system, wherein the power supply system includes a first power supply device 210 and a second power supply device 220, wherein the first power supply device 210 is connected to a power storage device 510, and the first power supply device 210 and the second power supply device 220 are connected at a coupling point.

[0142] like Figure 8 As shown, the control device of the power supply system includes: An acquisition module 810 is used to acquire a current state of charge and a current charge and discharge power of the energy storage device 510 connected to the first power supply device 210; The processing module 820 is used to execute the target control strategy when the current state of charge exceeds the target state of charge range or the current charge and discharge power exceeds the target power range; Among them, the implementation of the target control strategy includes: Controlling the frequency of the first power supply device 210; Alternatively, the contactor connected to the second power supply device 220 is controlled to be disconnected so that the second power supply device 220 is disconnected from the coupling point.

[0143] According to the control device of the power supply system provided in the embodiment of the present application, by monitoring the current state of charge and the current charging and discharging power in real time, if the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed. In this way, energy management of multiple power supply devices can be achieved without establishing communication, thereby ensuring the smooth operation of the power supply system.

[0144] In some embodiments, the processing module 820 is configured to execute a target control strategy when the current state of charge exceeds a target state of charge range, including: Determining a frequency adjustment amount based on the current state of charge; Based on the frequency adjustment amount, the frequency of the first power supply device 210 is adjusted.

[0145] In some embodiments, the processing module 820 is configured to adjust the frequency of the first power supply device 210 based on the frequency adjustment amount, including: When the current state of charge is greater than the maximum value of the target state of charge range, the frequency of the first power supply device 210 is increased based on the frequency adjustment amount, so that the second power supply device 220 automatically operates at a reduced rating; When the frequency of the first power supply device 210 is greater than the over-frequency protection threshold, the second power supply device 220 automatically stops running.

[0146] In some embodiments, the processing module 820 is configured to adjust the frequency of the first power supply device 210 based on the frequency adjustment amount, including: When the current state of charge is less than the minimum value of the target state of charge range, based on the frequency adjustment amount, the frequency of the first power supply device 210 is reduced so that the second power supply device 220 automatically increases the output power; When the frequency of the first power supply device 210 is less than the under-frequency protection threshold, the second power supply device 220 automatically stops running.

[0147] In some embodiments, the frequency of the first power supply device 210 is positively correlated with the current state of charge.

[0148] In some embodiments, the processing module 820 is configured to execute a target control strategy when the current state of charge exceeds a target state of charge range, including: When the current state of charge is greater than a maximum value of the target state of charge range, the contactor connected to the second power supply device 220 connected to the power generation device 520 is controlled to be disconnected.

[0149] In some embodiments, the processing module 820 is configured to execute a target control strategy when the current state of charge exceeds a target state of charge range, including: When the current state of charge is less than the minimum value of the target state of charge range, the contactor connected to the second power supply device 220 connected to the energy storage device 510 is controlled to be disconnected.

[0150] In some embodiments, the processing module 820 is used to execute the target control strategy when the current charging and discharging power exceeds the target power range, including: When the second power supply device 220 is connected to a contactor and the second power supply device 220 is allowed to be switched off, the contactor connected to the second power supply device 220 is controlled to be disconnected.

[0151] In some embodiments, the processing module 820 is used to execute the target control strategy when the current charging and discharging power exceeds the target power range, including: When the second power supply device 220 is not connected to a contactor, or the second power supply device 220 is not allowed to be switched off, the voltage or frequency at the coupling point becomes abnormal, and the second power supply device 220 automatically stops running.

[0152] In some embodiments, the processing module 820 is further used to obtain current coupling point parameters of the coupling point; The current coupling point parameter is used as a feedback value, and the target coupling point parameter is used as a reference value to perform power control on the first power supply device 210 .

[0153] The control device of the power supply system in the embodiment of the present application may be an electronic device, or a component in the electronic device, such as an integrated circuit or a chip.

[0154] The control device of the power supply system provided in the embodiment of the present application can implement each process implemented in the above-mentioned power supply system control method embodiment, and will not be described again here to avoid repetition.

[0155] The embodiment of the present application also provides a power supply system.

[0156] like Figure 2 As shown, the power supply system may include a first power supply device 210 , a second power supply device 220 and a control device as described above, and the control device is connected to the contactors connected to the first power supply device 210 and the second power supply device 220 .

[0157] The first power supply device 210 is connected to the energy storage device 510 , and the first power supply device 210 and the second power supply device 220 are connected at a coupling point.

[0158] It should be noted that the first power supply device 210 and the second power supply device 220 are two types of power supply devices.

[0159] The power supply equipment is used to realize power conversion between DC voltage and AC voltage. The power supply equipment can be an inverter, a converter and other equipment.

[0160] It can be understood that the power supply system may include multiple first power supply devices 210 to support multiple machines in parallel, and the power supply system may also include multiple second power supply devices 220 to also support multiple machines in parallel.

[0161] The first power supply device 210 is connected to the energy storage device 510 . The first power supply device 210 can absorb excess electric energy through the coupling point. The first power supply device 210 can also download electricity from the power grid and store it in the energy storage device 510 .

[0162] The second power supply device 220 can be connected to the power generation device 520, or to the energy storage device 510, or to the power generation device 520 and the energy storage device 510. For example, the second power supply device 220 can be a photovoltaic inverter, a pure storage inverter, or a photovoltaic storage inverter.

[0163] It should be noted that no communication connection is established between the first power supply device 210 and the second power supply device 220. The control device establishes communication with the first power supply device 210, and the first power supply device 210 is a controllable power supply device. The control device does not establish communication with the second power supply device 220, and the second power supply device 220 is an uncontrollable power supply device.

[0164] It can be understood that the second power supply device 220 operates according to the control strategy set by itself. The control method of the embodiment of the present application will not directly control the action of the second power supply device 220 (that is, the second power supply device 220 is uncontrolled). The second power supply device 220 can monitor the voltage or frequency of the coupling point in real time, adjust its own output state, and realize its own safety protection function.

[0165] In actual implementation, the first power supply device 210 is provided with a first controller 310, and the first controller 310 can control the operating state of the first power supply device 210 according to the input signal. The second power supply device 220 is correspondingly provided with a second controller 320, and the second controller 320 can control the operating state of the second power supply device 220 according to the input signal.

[0166] A specific embodiment is described below by taking the control device of the power supply system as the master controller 400 as an example.

[0167] like Figure 2 As shown, the current state of charge, coupling point voltage, coupling point frequency and other parameters are monitored, and the primary control strategy and the secondary control strategy are adopted to realize the power management of multiple power supply devices in the power supply system.

[0168] The primary control strategy can maximize the utilization of power generation. The main controller 400 monitors the voltage at the coupling point. U PCC or coupling point frequency F Ref , with the target coupling point voltage U Ref Or target coupling point frequency F Ref As a reference, the power reference value of the controllable first power supply device 210 is output P INV1_Ref , P INV2_Ref … P INVn_Ref, and distribute it to each first power supply device 210 to obtain their respective power reference values P INV1_Ref , P INV2_Ref … P INVn_Ref , and perform closed-loop control.

[0169] When the second power supply device 220 outputs excess power to the coupling point on the basis of meeting the power consumption of the load 600, according to the law of conservation of energy, the voltage at the coupling point will increase accordingly. After the aforementioned closed-loop control, the first power supply device 210 obtains the increased power instructions, increases the power consumption, and realizes the transfer of the generated power to the second power supply device 220, so that the second power supply device 220 can participate in the energy scheduling of the power supply system in an orderly manner.

[0170] When the first power supply device 210 reaches the maximum absorption capacity, that is, the charge state of the energy storage device 510 of the first power supply device 210 is too high or the charging power reaches the critical value, the remaining power of the second power supply device 220 can no longer be effectively absorbed. At this time, the secondary control strategy is executed.

[0171] In addition, when the charge state of the energy storage device 510 is too low or the discharge power reaches a critical value, in order to prevent the second power supply device 220 from causing system voltage or frequency abnormalities or further reduction in the charge state, a secondary control strategy can also be executed to coordinate the output of the second power supply device 220 through frequency modulation or contactor on-off control, triggering the second power supply device 220 to actively perform voltage abnormality protection or frequency abnormality protection.

[0172] According to the power supply system provided in the embodiment of the present application, by monitoring the current state of charge and the current charging and discharging power in real time, if the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed. This can achieve energy management of multiple power supply devices without establishing communication and ensure the smooth operation of the power supply system.

[0173] 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, the various processes of the embodiment of the control method of the above-mentioned power supply system are implemented, and the same technical effect can be achieved. To avoid repetition, it will not be described here.

[0174] 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.

[0175] 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.

[0176] 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.

[0177] 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.

[0178] 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.

[0179] 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.

[0180] 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.

[0181] 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.

[0182] 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.

[0183] 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.

[0184] 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.

[0185] 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 control method for a power supply system, characterized in that: The power supply system includes a first power supply device and a second power supply device, the first power supply device is connected to an energy storage device, the first power supply device and the second power supply device are connected to a coupling point, and the control method includes: Obtaining a current state of charge and a current charging and discharging power of an energy storage device connected to the first power supply device; When the current state of charge exceeds the target state of charge range, or the current charge and discharge power exceeds the target power range, executing the target control strategy; Wherein, the execution target control strategy includes: controlling the frequency of the first power supply device; Alternatively, controlling the disconnection of a contactor connected to the second power supply device so that the second power supply device is disconnected from the coupling point; When the current state of charge exceeds the target state of charge range, executing the target control strategy includes: Determining a frequency adjustment amount based on the current state of charge; Based on the frequency adjustment amount, adjusting the frequency of the first power supply device; The adjusting the frequency of the first power supply device based on the frequency adjustment amount includes: When the current state of charge is greater than a maximum value of the target state of charge range, based on the frequency adjustment amount, raising the frequency of the first power supply device so that the second power supply device automatically operates at a reduced rating; Wherein, when the frequency of the first power supply device is greater than the over-frequency protection threshold, the second power supply device automatically stops running; The adjusting the frequency of the first power supply device based on the frequency adjustment amount further includes: When the current state of charge is less than a minimum value of the target state of charge range, based on the frequency adjustment amount, reducing the frequency of the first power supply device so that the second power supply device automatically increases output power; Wherein, when the frequency of the first power supply device is lower than an under-frequency protection threshold, the second power supply device automatically stops running.

2. The control method of the power supply system according to claim 1, characterized in that: The frequency of the first power supply device is positively correlated with the current state of charge.

3. The control method of the power supply system according to claim 1, characterized in that: When the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is greater than a maximum value of the target state of charge range, the contactor connected to the second power supply device connected to the power generation device is controlled to be disconnected.

4. The control method of the power supply system according to claim 1, characterized in that: When the current state of charge exceeds the target state of charge range, executing the target control strategy includes: When the current state of charge is less than a minimum value of the target state of charge range, the contactor connected to the second power supply device connected to the energy storage device is controlled to be disconnected.

5. The control method of the power supply system according to claim 1, characterized in that: When the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device is connected to a contactor and the second power supply device is allowed to be switched off, the contactor connected to the second power supply device is controlled to be disconnected.

6. The control method of the power supply system according to claim 1, characterized in that: When the current charging and discharging power exceeds the target power range, executing the target control strategy includes: When the second power supply device is not connected to a contactor, or the second power supply device is not allowed to be switched off, the voltage or frequency at the coupling point becomes abnormal, and the second power supply device automatically stops running.

7. The control method of the power supply system according to any one of claims 1 to 6, characterized in that: Before executing the target control strategy, the method further includes: Obtaining current coupling point parameters of the coupling point; The current coupling point parameter is used as a feedback value and the target coupling point parameter is used as a reference value to perform power control on the first power supply device.

8. A control device for a power supply system, characterized in that: The power supply system includes a first power supply device and a second power supply device, the first power supply device is connected to an energy storage device, the first power supply device and the second power supply device are connected at a coupling point, and the control device includes: An acquisition module, used to acquire a current state of charge and a current charge and discharge power of an energy storage device connected to the first power supply device; A processing module, configured to execute a target control strategy when the current state of charge exceeds a target state of charge range, or when the current charge and discharge power exceeds a target power range; Wherein, the execution target control strategy includes: controlling the frequency of the first power supply device; Alternatively, controlling the disconnection of a contactor connected to the second power supply device so that the second power supply device is disconnected from the coupling point; The processing module is used to execute the target control strategy when the current state of charge exceeds the target state of charge range, including: Determining a frequency adjustment amount based on the current state of charge; Based on the frequency adjustment amount, adjusting the frequency of the first power supply device; The processing module is used to adjust the frequency of the first power supply device based on the frequency adjustment amount, including: When the current state of charge is greater than a maximum value of the target state of charge range, based on the frequency adjustment amount, raising the frequency of the first power supply device so that the second power supply device automatically operates at a reduced rating; Wherein, when the frequency of the first power supply device is greater than the over-frequency protection threshold, the second power supply device automatically stops running; The processing module is used to adjust the frequency of the first power supply device based on the frequency adjustment amount, and further includes: When the current state of charge is less than a minimum value of the target state of charge range, based on the frequency adjustment amount, reducing the frequency of the first power supply device so that the second power supply device automatically increases output power; Wherein, when the frequency of the first power supply device is lower than an under-frequency protection threshold, the second power supply device automatically stops running.

9. A power supply system, characterized in that: include: A first power supply device and a second power supply device, wherein the first power supply device is connected to an energy storage device, and the first power supply device and the second power supply device are connected to a coupling point; The control device of the power supply system according to claim 8, wherein the control device is connected to the contactors connected to the first power supply device and the second power supply device.

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