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

Abstract

The application discloses a power supply system control method and device and a power supply system, and belongs to the technical field of power supply. The power supply system control method comprises the following steps: acquiring the current state of charge and the current charging and discharging power of an energy storage device connected to a first power supply device; in the case that the current state of charge is out of a target state of charge range or the current charging and discharging power is out of a target power range, a target control strategy is executed; wherein the execution of the target control strategy comprises: controlling the frequency of the first power supply device; or 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 method can realize energy management of multiple power supply devices without establishing communication, and ensure the stable operation of the power supply system.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of power supply, and particularly relates to a control method and device of a power supply system and the power supply system. BACKGROUND

[0002] For a new energy grid-connected project that has been put into operation, a light storage or energy storage system can be added on the basis of original equipment to build a microgrid and realize maximum self-generation and self-use. Multiple inverter power supply devices in the microgrid can come from different manufacturers or belong to different models, and there are phenomena such as difficulty in rewiring and communication protocol incompatibility, making it difficult to build a system communication network. At the same time, phenomena such as excess power generation and excessive charging and discharging power can occur in the system, leading to unstable system control.

[0003] How to realize energy management of multiple power supply devices without establishing communication and ensure stable operation of the system is a technical problem that needs to be solved in the field. SUMMARY

[0004] The present application aims to at least solve one of the technical problems existing in the prior art. To this end, the present application provides a control method and device of a power supply system and the power supply system, which can realize energy management of multiple power supply devices without establishing communication and ensure stable operation of the power supply system.

[0005] In a first aspect, the present application provides a control method of 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 with an energy storage device, the first power supply device and the second power supply device being connected to a coupling point, the control method comprising:

[0006] obtaining a current state of charge and a current charging and discharging power of the energy storage device connected with the first power supply device;

[0007] in a case where the current state of charge is out of a target state of charge range or the current charging and discharging power is out of a target power range, executing a target control strategy;

[0008] wherein the executing the target control strategy comprises:

[0009] controlling a frequency of the first power supply device;

[0010] or, controlling disconnection of a contactor connected with the second power supply device to disconnect the second power supply device from the coupling point.

[0011] The control method of the power supply system according to the application can realize energy management of multiple power supply devices and ensure smooth operation of the power supply system by monitoring the current state of charge and the current charging and discharging power in real time, performing a target control strategy when the current state of charge or the current charging and discharging power is out of the normal working range, without the need to establish communication.

[0012] According to an embodiment of the application, when the current state of charge is out of the target state of charge range, performing the target control strategy comprises:

[0013] determining a frequency adjustment amount based on the current state of charge;

[0014] adjusting the frequency of the first power supply device based on the frequency adjustment amount.

[0015] According to an embodiment of the application, adjusting the frequency of the first power supply device based on the frequency adjustment amount comprises:

[0016] when the current state of charge is greater than the maximum value of the target state of charge range, increasing the frequency of the first power supply device based on the frequency adjustment amount to make the second power supply device operate at a reduced capacity automatically;

[0017] wherein, when the frequency of the first power supply device is greater than an over-frequency protection threshold, the second power supply device stops operating automatically.

[0018] According to an embodiment of the application, adjusting the frequency of the first power supply device based on the frequency adjustment amount comprises:

[0019] when the current state of charge is less than the minimum value of the target state of charge range, decreasing the frequency of the first power supply device based on the frequency adjustment amount to make the second power supply device increase the output power automatically;

[0020] wherein, when the frequency of the first power supply device is less than an under-frequency protection threshold, the second power supply device stops operating automatically.

[0021] According to an embodiment of the application, the frequency of the first power supply device and the current state of charge are in a positive correlation.

[0022] According to an embodiment of the application, when the current state of charge is out of the target state of charge range, performing the target control strategy comprises:

[0023] when the current state of charge is greater than the maximum value of the target state of charge range, controlling a contactor connected to the second power supply device with a power generation device to be disconnected.

[0024] According to one embodiment of the present application, when the current state of charge exceeds the target state of charge range, the target control strategy is executed, including:

[0025] 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 is controlled to be disconnected.

[0026] According to one embodiment of the present application, when the current charging and discharging power exceeds the target power range, the target control strategy is executed, including:

[0027] When the second power supply device is connected to a contactor and the second power supply device allows cutting out, the contactor connected to the second power supply device is controlled to be disconnected.

[0028] According to one embodiment of the present application, when the current charging and discharging power exceeds the target power range, the target control strategy is executed, including:

[0029] When the second power supply device is not connected to a contactor or the second power supply device does not allow cutting out, the voltage or frequency of the coupling point is abnormal, and the second power supply device automatically stops running.

[0030] According to one embodiment of the present application, before the target control strategy is executed, the method further includes:

[0031] Obtaining the current coupling point parameter of the coupling point;

[0032] Taking the current coupling point parameter as a feedback value and taking a target coupling point parameter as a reference value, the first power supply device is controlled in power.

[0033] In a second aspect, the present application provides a control device of a power supply system, the power supply system including 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 to a coupling point, the control device including:

[0034] The acquisition module is configured to acquire the current state of charge of the energy storage device connected to the first power supply device and the current charging and discharging power;

[0035] The processing module is configured to execute a target control strategy when the current state of charge exceeds a target state of charge range or the current charging and discharging power exceeds a target power range.

[0036] The execution of the target control strategy includes:

[0037] Controlling the frequency of the first power supply device.

[0038] Alternatively, the disconnection of the contactor connected with the second power supply device is controlled to disconnect the second power supply device from the coupling point.

[0039] According to the control device of the power supply system provided by the present application, by monitoring the current state of charge and the current charging and discharging power in real time, when the current state of charge or the current charging and discharging power is out of the normal working range, the target control strategy is executed, so that the energy management of the multiple power supply devices can be realized without establishing communication, and the smooth operation of the power supply system is ensured.

[0040] In a third aspect, the present application provides a power supply system, comprising:

[0041] a first power supply device and a second power supply device, the first power supply device being connected with an energy storage device, and the first power supply device and the second power supply device being connected to a coupling point;

[0042] The control device of the power supply system according to the second aspect described above is connected with the first power supply device and the contactor connected with the second power supply device.

[0043] 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, and the processor implements the control method of the power supply system according to the first aspect described above when executing the computer program.

[0044] In a fifth aspect, the present application provides a non-transitory computer readable storage medium, having a computer program stored thereon, and the computer program is executable on a processor to implement the control method of the power supply system according to the first aspect described above.

[0045] In a sixth aspect, the present application provides a computer program product, comprising a computer program, and the computer program is executable on a processor to implement the control method of the power supply system according to the first aspect described above.

[0046] Additional aspects and advantages of the present application will be in part apparent and in part pointed out hereinafter. BRIEF DESCRIPTION OF DRAWINGS

[0047] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the appended drawings, wherein:

[0048] Figure 1 is one of the flowcharts of the control method of the power supply system provided by the embodiments of the present application;

[0049] Figure 2is a structural schematic diagram of a power supply system provided by an embodiment of the present application;

[0050] Figure 3 is a second flow schematic diagram of a control method of a power supply system provided by an embodiment of the present application;

[0051] Figure 4 is a schematic diagram of a state of charge-frequency relationship of a power supply system provided by an embodiment of the present application;

[0052] Figure 5 is a schematic diagram of a state of charge-contactor state relationship of a power supply system provided by an embodiment of the present application;

[0053] Figure 6 is a schematic diagram of a coupling point voltage-contactor state relationship of a power supply system provided by an embodiment of the present application;

[0054] Figure 7 is a schematic diagram of a coupling point frequency-contactor state relationship of a power supply system provided by an embodiment of the present application;

[0055] Figure 8 is a structural schematic diagram of a control device of a power supply system provided by an embodiment of the present application;

[0056] Figure 9 is a structural schematic diagram of an electronic device provided by an embodiment of the present application.

[0057] Reference signs:

[0058] The first power supply device 210, the second power supply device 220, the first controller 310, the second controller 320, the total controller 400, the energy storage device 510, the power generation device 520, the load 600, the acquisition module 810, the processing module 820, the electronic device 900, the processor 901, the memory 902. DETAILED DESCRIPTION

[0059] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0060] 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 interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / " generally indicates that the objects before and after are in an "or" relationship.

[0061] The power supply system control method, power supply system control device, power supply system, electronic device and readable storage medium provided by the embodiments of the present application will be described in detail below in conjunction with the drawings, specific embodiments and application scenarios.

[0062] The power supply system of the embodiments of the present application can include a first power supply device 210 and a second power supply device 220, the first power supply device 210 is connected with an energy storage device 510, and the first power supply device 210 and the second power supply device 220 are connected to a coupling point.

[0063] Among them, the first power supply device 210 and the second power supply device 220 are two types of power supply devices.

[0064] The power supply device is used to realize power conversion between direct current voltage and alternating current voltage, and the power supply device can be an inverter, a current transformer and the like.

[0065] It can be understood that the power supply system can include a plurality of first power supply devices 210, and the power supply system can also include a plurality of second power supply devices 220, and the power supply system supports multi-machine parallel connection.

[0066] The first power supply device 210 and the second power supply device 220 are connected to the coupling point, the coupling point is an electric energy collection point in the power supply system, the coupling point can be connected to a load 600, and the load 600 is powered by the power supply system, and 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.

[0067] The first power supply device 210 is connected with the energy storage device 510, and the first power supply device 210 can consume electric energy through the coupling point, and the first power supply device 210 can also output electric energy through the coupling point.

[0068] The power supply system control method provided by the embodiments of the present application, the execution subject of the power supply system control method can be an electronic device or a functional module or functional entity capable of realizing the power supply system control method in the electronic device.

[0069] It should be noted that there is no communication connection 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, while the second power supply device 220 is an uncontrollable power supply device.

[0070] The second power supply device 220 can be connected to the power generation device 520, the energy storage device 510, or both the power generation device 520 and the energy storage device 510.

[0071] For example, the second power supply device 220 can be a photovoltaic inverter, a pure energy storage inverter, or a photovoltaic-energy storage inverter.

[0072] It is understandable that when an uncontrollable second power supply device 220 is connected to the power supply system, there may be problems such as excess power generation or excessive charging and discharging power, which may lead to system instability.

[0073] The power supply system control method provided in this application embodiment can realize energy management of multiple power supply devices without establishing communication, thus ensuring the stable operation of the power supply system.

[0074] like Figure 1 As shown, the control method of the power supply system includes steps 110 and 120.

[0075] Step 110: Obtain the current state of charge and current charging / discharging power of the energy storage device 510 connected to the first power supply device 210.

[0076] It is understandable that the current state of charge of the energy storage device 510 connected to the first power supply device 210 can reflect the absorption or output capacity of the first power supply device 210, and the current charging and discharging power corresponding to the first power supply device 210 can reflect the operating status of the first power supply device 210. By combining the absorption capacity, output capacity and operating status of the controllable first power supply device 210, the stability of the power supply system can be judged.

[0077] 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 charging and discharging power of the first power supply device 210 are obtained in real time. Based on the current state of charge and the current charging and discharging power, it is determined whether the power supply system has an unstable tendency or has already experienced instability.

[0078] It is understandable that when the power supply system includes multiple first power supply devices 210 operating in parallel, the current state of charge is determined based on the state of charge of the energy storage devices 510 connected to the multiple first power supply devices 210, and the current charging and discharging power is determined based on the charging and discharging power of the multiple first power supply devices 210.

[0079] It should be noted that the current charging and discharging power corresponding to the first power supply device 210 can be represented by the voltage or frequency of the coupling point. If the current charging and discharging power changes, the voltage or frequency of the coupling point will change accordingly. The current charging and discharging 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.

[0080] Step 120: If the current state of charge is out of the target state of charge range, or the current charging and discharging power is out of the target power range, the target control strategy is executed.

[0081] The target state of charge range is a preset state of charge range of the energy storage device 510 in normal operation, and the target power range is a preset charging and discharging power range of the first power supply device 210 in normal operation.

[0082] In actual implementation, the target state of charge range and the target power range can be adjusted according to actual operation requirements.

[0083] In this step, if the current state of charge is out of the target state of charge range, or the current charging and discharging power is out of the target power range, it is determined that the power supply system has a risk of losing control, and the target control strategy is executed.

[0084] It can be understood that the current charging and discharging power out of the target power range can be manifested as the voltage of the coupling point out of the target voltage range in normal operation, or the frequency of the coupling point out of the target frequency range in normal operation.

[0085] It should be noted that the current state of charge and the current charging and discharging power are monitored in real time, and at least one of the current state of charge and the current charging and discharging power is out of the corresponding normal operation range, and the target control strategy is executed.

[0086] The target control strategy includes:

[0087] Controlling the frequency of the first power supply device 210;

[0088] Or, controlling the disconnection of the contactor connected to the second power supply device 220 to disconnect the second power supply device 220 from the coupling point.

[0089] In this embodiment, the energy management of the multi-party power supply device can be realized 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, and the stability of the operation of the power supply system is improved.

[0090] It can be understood that the first power supply device 210 and the second power supply device 220 are connected to the coupling point, the frequency of the first power supply device 210 is controlled, when the frequency of the first power supply device 210 changes, the voltage or frequency of the coupling point changes accordingly, and for the second power supply device 220, the second power supply device 220 can monitor the voltage or frequency of the coupling point, and actively take protective action according to the voltage or frequency of the coupling point.

[0091] For example, the power supply system has sufficient power, 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 threshold, and the first power supply device 210 cannot absorb the remaining power output by the second power supply device 220.

[0092] In this embodiment, the frequency of the first power supply device 210 is controlled to rise, the second power supply device 220 monitors the change of the voltage or frequency of the coupling point, and the second power supply device 220 actively over-frequence and de-rate, which can avoid the remaining power output by the second power supply device 220 from causing the coupling point to lose control, realize energy management of multiple power supply devices, and improve the stability of the power supply system.

[0093] It can be understood that the second power supply device 220 operates according to its own control strategy, and the embodiments of the application do not directly control the action of the second power supply device 220 (i.e., the second power supply device 220 is not controlled), and 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.

[0094] It should be noted that the contactor connected to the second power supply device 220 is a switching device for controlling 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, and 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.

[0095] For example, the power supply system has sufficient power, 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 threshold, and the first power supply device 210 cannot absorb the remaining power output by the second power supply device 220.

[0096] In this embodiment, the disconnection of the contactor connected to the second power supply device 220 is controlled, which can avoid the remaining power output by the second power supply device 220 from causing the coupling point to lose control, realize energy management of multiple power supply devices, and improve the stability of the power supply system.

[0097] It can be understood that when the power of the power supply system is insufficient or the output of the second power supply device 220 is abnormal, the energy management of the multi-party power supply device can also be realized 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, and the stability of the power supply system operation is improved.

[0098] In the embodiment of the application, by monitoring the current state of charge and the current charging and discharging power in real time, when the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed, and the energy management of the multi-party power supply device is realized by controlling the frequency of the first power supply device 210 and the on-off of the contactor connected to the second power supply device 220, which can prevent the system from being unstable caused by the uncontrolled second power supply device 220, and effectively improve the stability of the power supply system operation.

[0099] According to the power supply system control method provided in the embodiment of the application, by monitoring the current state of charge and the current charging and discharging power in real time, when the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed, which can realize the energy management of the multi-party power supply device without establishing communication, and ensure the stable operation of the power supply system.

[0100] The embodiment of the application will be described in detail from two different implementation angles.

[0101] I. Frequency control.

[0102] In some embodiments, step 120, in the case where the current state of charge exceeds the target state of charge range, the target control strategy is executed, which can include:

[0103] determining a frequency adjustment amount based on the current state of charge;

[0104] adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount.

[0105] It can be understood that when the first power supply device 210 is normally operated, the frequency of the first power supply device 210 is maintained at a certain value or range, and the frequency adjustment amount is a change amount for adjusting the frequency of the first power supply device 210 normally operated according to the current state of charge.

[0106] In this embodiment, the corresponding frequency adjustment amount can be calculated according to the current state of charge, and the frequency of the first power supply device 210 is adjusted by the frequency adjustment amount corresponding to the current state of charge.

[0107] For example, the frequency of the first power supply device 210 is controlled according to the following formula:

[0108] freq = f 0+Δ f

[0109] wherein, freq f represents the frequency of controlling the first power supply device 210 to operate, f 0 represents the frequency of the first power supply device 210 operating normally, and Δ f represents the frequency adjustment amount.

[0110] In this embodiment, Δ f=f a ( soc ), soc SOC represents the current state of charge, f a ( soc ) represents the functional relationship between the current state of charge and the frequency adjustment amount.

[0111] In some embodiments, adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount can include:

[0112] In the case where 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 raised based on the frequency adjustment amount, so that the second power supply device 220 automatically operates at a reduced capacity.

[0113] wherein, in the case where 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 operating.

[0114] 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 is outside the target state of charge range, and the energy of the energy storage device 510 connected to the first power supply device 210 is relatively large, and the first power supply device 210 cannot accommodate more energy. At this time, the frequency of the first power supply device 210 is raised, and the voltage or frequency of the coupling point changes, which can be manifested as over-frequency of the coupling point. The second power supply device 220 monitors the change of the coupling point and actively operates at a reduced capacity due to over-frequency.

[0115] It can be understood that by raising the frequency of the first power supply device 210, the second power supply device 220 automatically operates at a reduced capacity, and the energy actively output by the second power supply device 220 to the coupling point is reduced, effectively improving the stability of the power supply system.

[0116] In this embodiment, if the current state of charge further increases, the frequency of the first power supply device 210 will continue to rise.

[0117] In actual execution, when the frequency of the first power supply device 210 is greater than the over-frequency protection threshold, the second power supply device 220 monitors that the frequency of the coupling point reaches the over-frequency protection point of the second power supply device 220, and the second power supply device 220 automatically stops operating, achieving protection shutdown, which can avoid the system instability caused by the excess energy of the second power supply device 220.

[0118] The over-frequency protection threshold is a preset frequency threshold, which can be set according to the over-frequency protection point of the second power supply device 220.

[0119] In some embodiments, adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount can include:

[0120] In a case where 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.

[0121] In a case where 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.

[0122] In this embodiment, the current state of charge being less than the minimum value of the target state of charge range indicates that the current state of charge is out of the target state of charge range, and the energy of the energy storage device 510 connected to the first power supply device 210 is less. 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 actively runs in under-frequency power increase mode to realize energy management between the two types of power supply devices in the power supply system and improve the running stability.

[0123] It can be understood that by reducing the frequency of the first power supply device 210, the second power supply device 220 automatically runs in power increase mode, the second power supply device 220 actively outputs more energy to the coupling point, the first power supply device 210 consumes the energy of the coupling point, improves the energy storage stability, and effectively improves the smoothness of the power supply system operation.

[0124] In this embodiment, if the current state of charge further decreases, the frequency of the first power supply device 210 will continue to decrease.

[0125] In actual execution, 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 reaches the under-frequency protection point of the second power supply device 220, and the second power supply device 220 automatically stops running to realize protection shutdown, avoid the loss of control of the coupling point charging and discharging power due to large power, and improve the smoothness of the power supply system operation.

[0126] The under-frequency protection threshold is a preset frequency threshold, which can be set according to the under-frequency protection point of the second power supply device 220.

[0127] In some embodiments, the frequency of the first power supply device 210 and the current state of charge are positively correlated.

[0128] In this embodiment, the frequency of the first power supply device 210 is adjusted when the current state of charge exceeds the target state of charge range, 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.

[0129] It should be noted that when the current state of charge is within the target state of charge range, the frequency of the first power supply device 210 is maintained at a certain value or range.

[0130] When the current state of charge exceeds the target state of charge range, the frequency of the first power supply device 210 changes positively 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 reduced capacity and increased power. When the reduced capacity operation and the increased power operation cannot achieve a stable state, the frequency of the first power supply device 210 will rise to the over-frequency protection threshold or decrease to the under-frequency protection threshold with the current state of charge, so that the second power supply device 220 automatically shuts down for protection.

[0131] A specific embodiment will be described below.

[0132] For example, as shown in Figure 4 , soc 0 represents the median of the state of charge of the energy storage device 510 connected to the first power supply device 210, soc 0 can take a value of 50%, soc 1 represents the maximum value of the target state of charge range, soc 2 represents the minimum value of the target state of charge range.

[0133] Among them, soc 1 can be equal to the system charging critical value, soc 2 can be equal to the system discharging critical value, and the charging critical value and the discharging critical value are related to the charging and discharging cutoff state of charge of the energy storage device 510.

[0134] In this embodiment, soc 3 represents the system charging cutoff value, soc 4 represents the system discharging cutoff value, f 1, f 2 represents the frequency adjustment range of the first power supply device 210, which is related to the over-frequency threshold and under-frequency threshold of the specified power generation device 520.

[0135] When the current state of charge exceeds the target state of charge range, the frequency of the first power supply device 210 is adjusted according to freq = f 0+Δ fThe frequency of the first power supply device 210 is controlled, and 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, and as the current state of charge decreases, the frequency of the first power supply device 210 decreases.

[0136] 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 be raised, the second power supply device 220 is actively over-frequency and power is reduced, the current state of charge is further increased, and the frequency of the first power supply device 210 reaches the over-frequency protection threshold f 1, the second power supply device 220 is actively protected and shut down to avoid power overrunning of the coupling point.

[0137] 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 be reduced, the second power supply device 220 is actively under-frequency and power is increased, the current state of charge is further reduced, and the frequency of the first power supply device 210 reaches the under-frequency protection threshold f 2, the second power supply device 220 is actively protected and shut down to avoid instability caused by excessive charging power of the coupling point.

[0138] II. Contactor control.

[0139] In some embodiments, when the current state of charge is outside the target state of charge range, a target control strategy is executed, including:

[0140] When the current state of charge is greater than the 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.

[0141] 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 of the energy storage device 510 connected to the first power supply device 210 is relatively large, and the first power supply device 210 cannot accommodate more 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, reducing the active output of the second power supply device 220 to the coupling point, and effectively improving the stability of the power supply system.

[0142] In some embodiments, when the current state of charge is outside the target state of charge range, a target control strategy is executed, including:

[0143] 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.

[0144] In this embodiment, the current state of charge is less than the minimum value of the target state of charge range, indicating that the first power supply device 210 connected to the energy storage device 510 has less power, and the charging and discharging power may be large. 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, avoiding the first power supply device 210 from excessively consuming the power of the second power supply device 220, protecting the energy storage device 510 connected to the second power supply device 220, and improving the stability of the power supply system operation.

[0145] A specific embodiment will be described below.

[0146] For example, as shown in Figure 5 , soc 0 represents the median of the state of charge of the energy storage device 510 connected to the first power supply device 210, soc 0 can be 50%, soc 1 represents the maximum value of the target state of charge range, soc 2 represents the minimum value of the target state of charge range.

[0147] Among them, soc 1 can be equal to the system charging critical value, soc 2 can be equal to the system discharging critical value, and the charging critical value and the discharging critical value are related to the charging and discharging cutoff state of charge of the energy storage device 510.

[0148] In this embodiment, S represents the contactor state, S 1 represents the contactor attraction, S 2 represents the contactor disconnection.

[0149] When 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 energy storage device 510 is controlled to be disconnected; and when 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, avoiding the situation that the controllable first power supply device 210 cannot be stably operated when the state of charge reaches the critical value.

[0150] In some embodiments, when the current charging and discharging power exceeds the target power range, the target control strategy is executed, including:

[0151] In the case that the second power supply device 220 is connected to the contactor and the second power supply device 220 allows cutting out, the contactor connected to the second power supply device 220 is controlled to be disconnected.

[0152] In some embodiments, when the current charging and discharging power exceeds the target power range, the target control strategy is executed, including:

[0153] If the second power supply device 220 is not connected to a contactor, or if the second power supply device 220 is not allowed to be disconnected, and the voltage or frequency at the coupling point becomes abnormal, the second power supply device 220 will automatically stop operating.

[0154] 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.

[0155] When the second power supply device 220 is connected to a contactor and the second power supply device 220 is allowed to disconnect, the contactor connected to the second power supply device 220 is controlled to disconnect.

[0156] When the second power supply device 220 is not connected to a contactor or is not allowed to disconnect, due to abnormal voltage or frequency at the coupling point, the second power supply device 220 will actively perform voltage abnormality protection or frequency abnormality protection to suppress its own output.

[0157] In actual operation, 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 operating. 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 operating to avoid instability caused by excessive charging power at the coupling point.

[0158] The following is a specific example.

[0159] In this embodiment, the voltage through the coupling point U PCC, frequency F pcc represents the current charging and discharging power corresponding to the first power supply device 210.

[0160] like Figure 6 As shown, S Indicates the contactor status. S 1 indicates that the contactor is engaged. S 2 indicates that the contactor is open.

[0161] When the current charge / discharge power is greater than the maximum value of the target power range, U PCC is greater than the overvoltage protection point. U 1. Disconnect the contactor connected to the second power supply equipment 220.

[0162] When the current charging / discharging power is less than the maximum value of the target power range, U PCC is less than the undervoltage protection point. U 2. Disconnect the contactor connected to the second power supply equipment 220.

[0163] like Figure 7 As shown, Sindicates the contactor state, S 1 indicates the contactor closing, S 2 indicates the contactor opening.

[0164] when the current charging and discharging power is greater than the maximum value of the target power range, F pcc is greater than the over-frequency protection point F 1, control the connected contactor of the second power supply device 220 to open.

[0165] when the current charging and discharging power is less than the maximum value of the target power range, F pcc is less than the under-frequency protection point F 2, control the connected contactor of the second power supply device 220 to open.

[0166] In some embodiments, before the target control strategy is executed, the control method of the power supply system can further include:

[0167] acquiring a current coupling point parameter of the coupling point;

[0168] performing power control on the first power supply device 210 with the current coupling point parameter as a feedback value and a target coupling point parameter as a reference value.

[0169] In this embodiment, the current coupling point parameter of the coupling point is acquired in real time, and the first power supply device 210 is controlled in a closed loop with the preset target coupling point parameter as a reference value, so that the maximum self-generation and self-use of the system can be achieved.

[0170] The coupling point parameter can be a coupling point voltage or a coupling point frequency.

[0171] For example, the current coupling point voltage of the coupling point is acquired in real time, and the first power supply device 210 is controlled in a closed loop with the preset target coupling point voltage as a reference value.

[0172] For another example, the current coupling point frequency of the coupling point is acquired in real time, and the first power supply device 210 is controlled in a closed loop with the preset target coupling point frequency as a reference value.

[0173] When the second power supply device 220 outputs excess power to the coupling point on the basis of meeting its own power consumption, according to the law of conservation of energy, the voltage of the coupling point will rise, and the first power supply device 210 can absorb the excess power of the second power supply device 220 through closed-loop control of power with the target coupling point parameter as a reference value, so that the power management of the power supply system of multiple power supply devices can be achieved, the second power supply device 220 does not need to establish communication with the first power supply device 210, and the second power supply device 220 can also participate in the energy scheduling of the power supply system.

[0174] The embodiment of the application monitors 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 the power management of the multi-party power supply equipment of the power supply system through the first control strategy (closed loop control) and the second control strategy (target control strategy).

[0175] The first control strategy can realize the energy scheduling of the second power supply equipment 220 and the maximum utilization of the generated power, and the second control strategy can avoid the instability of the power supply system caused by the uncontrolled second power supply equipment 220.

[0176] A specific embodiment will be introduced below.

[0177] As shown in Figure 3 , the target coupling point voltage U Ref or the target coupling point frequency F Ref is taken as the reference value, the coupling point voltage is adjusted to U Ref , or the coupling point frequency is adjusted to F Ref .

[0178] The coupling point voltage or frequency is monitored to determine whether there is an abnormality, that is, the current charging and discharging power is obtained to determine whether there is an abnormality, when the voltage or frequency is abnormal (that is, the current charging and discharging power exceeds the target power range), if the contactor control is selected, the contactor of the second power supply equipment 220 is controlled to be disconnected, if the contactor control is not selected, the second power supply equipment 220 is actively protected to shut down.

[0179] The state of charge of the controllable system (the energy storage device 510 connected to the first power supply equipment 210) is monitored to determine whether it is close to the critical value, if it is not close to the critical value, it indicates that the current state of charge is within the target state of charge range, and the second power supply equipment 220 normally operates according to its own control strategy.

[0180] When it is close to the critical value, it indicates that the current state of charge exceeds the target state of charge range, if the contactor control is selected, the contactor is controlled to be connected or disconnected according to the current state of charge soc . S=f b ( soc ) represents the relationship between the contactor connection and disconnection and soc .

[0181] In actual execution, when the current state of charge is greater than the maximum value soc 1 of the target state of charge range, the contactor connected to the second power supply equipment 220 connected to the power generation device 520 is controlled to be disconnected; when the current state of charge is less than the minimum value soc2, control the second power supply device 220 connected with the energy storage device 510 to disconnect the contactor.

[0182] When the current state of charge exceeds the target state of charge range, the current state of charge soc Control the frequency, freq = f 0+Δ f =f 0+ f a The relationship between the frequency and the soc ) is represented. soc When the current state of charge is greater than the maximum value of the target state of charge range

[0183] 1, control the frequency of the first power supply device 210 to rise, the second power supply device 220 actively over-frequency and power reduction, the current state of charge is further increased, so that the frequency of the first power supply device 210 reaches the over-frequency protection threshold soc 1, the second power supply device 220 actively protects shutdown. f When the current state of charge is less than the minimum value of the target state of charge range

[0184] 2, control the frequency of the first power supply device 210 to reduce, the second power supply device 220 actively under-frequency and power increase, 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 soc 2, the second power supply device 220 actively protects shutdown. f In this embodiment, by monitoring the current state of charge, coupling point voltage, coupling point frequency and other parameters, the primary control strategy and the secondary control strategy are executed, and the energy management of the multi-party power supply device is realized. 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 smoothness of the power supply system operation can be effectively improved.

[0185] It should be noted that when the controllable first power supply device 210 reaches the maximum consumption capacity, that is, the current state of charge is too high or the charging power reaches the critical value, the remaining energy of the second power supply device 220 cannot be effectively consumed. The secondary control strategy is adopted to avoid the instability of the power supply system caused by the uncontrolled second power supply device 220.

[0186] In addition, when the current state of charge is too low or the discharging power reaches the critical value, the secondary control strategy is adopted to coordinate the output of the second power supply device 220, so as to avoid the second power supply device 220 causing abnormal system voltage or frequency or further reducing the state of charge.

[0187]

[0188] ​The control method of the power supply system provided in the embodiments of the present application can be executed by a control device of the power supply system. The embodiments of the present application take the control method of the power supply system executed by the control device of the power supply system as an example to describe the control device of the power supply system provided in the embodiments of the present application.

[0189] The embodiments of the present application also provide a control device of a power supply system. The power supply system includes a first power supply device 210 and a second power supply device 220. The first power supply device 210 is connected with an energy storage device 510. The first power supply device 210 and the second power supply device 220 are connected to a coupling point.

[0190] As shown in the figure, the control device of the power supply system includes: Figure 8

[0191] The acquisition module 810 is configured to acquire a current state of charge and a current charging and discharging power of the energy storage device 510 connected to the first power supply device 210.

[0192] The processing module 820 is configured to execute a target control strategy when the current state of charge is out of a target state of charge range or the current charging and discharging power is out of a target power range.

[0193] The execution of the target control strategy includes:

[0194] controlling a frequency of the first power supply device 210;

[0195] or controlling disconnection of a contactor connected to the second power supply device 220 to disconnect the second power supply device 220 from the coupling point.

[0196] According to the control device of the power supply system provided in the embodiments of the present application, the current state of charge and the current charging and discharging power are monitored in real time. When the current state of charge or the current charging and discharging power is out of the normal working range, the target control strategy is executed. Therefore, the energy management of the multi-party power supply device can be realized without establishing communication, and the stable operation of the power supply system is ensured.

[0197] In some embodiments, the processing module 820 is configured to execute the target control strategy when the current state of charge is out of the target state of charge range, including:

[0198] determining a frequency adjustment amount based on the current state of charge;

[0199] adjusting the frequency of the first power supply device 210 based on the frequency adjustment amount.

[0200] 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:

[0201] ​In a case where 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 raised based on the frequency adjustment amount, so that the second power supply device 220 is automatically operated at a reduced capacity.

[0202] In a case where the frequency of the first power supply device 210 is greater than the over-frequency protection threshold, the second power supply device 220 is automatically stopped.

[0203] 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:

[0204] In a case where 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 lowered based on the frequency adjustment amount, so that the second power supply device 220 is automatically operated at an increased output power.

[0205] In a case where the frequency of the first power supply device 210 is less than the under-frequency protection threshold, the second power supply device 220 is automatically stopped.

[0206] In some embodiments, the frequency of the first power supply device 210 and the current state of charge are in a positive correlation.

[0207] In some embodiments, the processing module 820 is configured to execute a target control strategy in a case where the current state of charge is out of the target state of charge range, including:

[0208] In a case where the current state of charge is greater than the maximum value of the target state of charge range, the contactor connected to the second power supply device 220 connected with the power generation device 520 is controlled to be disconnected.

[0209] In some embodiments, the processing module 820 is configured to execute a target control strategy in a case where the current state of charge is out of the target state of charge range, including:

[0210] In a case where 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 with the energy storage device 510 is controlled to be disconnected.

[0211] In some embodiments, the processing module 820 is configured to execute a target control strategy in a case where the current charging and discharging power is out of the target power range, including:

[0212] In a case where the second power supply device 220 is connected with a contactor and the second power supply device 220 is allowed to be cut off, the contactor connected to the second power supply device 220 is controlled to be disconnected.

[0213] In some embodiments, the processing module 820 is configured to execute a target control strategy in a case where the current charging and discharging power is out of the target power range, including:

[0214] In the case that the second power supply device 220 does not have a contactor or does not allow cutting out, the voltage or frequency of the coupling point is abnormal, and the second power supply device 220 automatically stops running.

[0215] In some embodiments, the processing module 820 is further configured to acquire a current coupling point parameter of the coupling point.

[0216] The first power supply device 210 is controlled in power with the current coupling point parameter as a feedback value and the target coupling point parameter as a reference value.

[0217] The control device of the power supply system in the embodiments of the present application can be an electronic device or a component in an electronic device, such as an integrated circuit or a chip.

[0218] The control device of the power supply system provided in the embodiments of the present application can implement each process of the control method of the power supply system, and thus repeated description is omitted here.

[0219] The embodiments of the present application further provide a power supply system.

[0220] As shown in Figure 2 The power supply system can include the first power supply device 210, the second power supply device 220, and the control device as described above, and the control device is connected to the contactors of the first power supply device 210 and the second power supply device 220.

[0221] The first power supply device 210 is connected to an energy storage device 510, and the first power supply device 210 and the second power supply device 220 are connected to the coupling point.

[0222] 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.

[0223] The power supply device is used to implement power conversion between direct current voltage and alternating current voltage, and the power supply device can be an inverter, a converter, or the like.

[0224] It can be understood that the power supply system can include multiple first power supply devices 210 to support multiple parallel machines, and the power supply system can also include multiple second power supply devices 220 to also support multiple parallel machines.

[0225] The first power supply device 210 is connected to an energy storage device 510, and the first power supply device 210 can absorb excess power through the coupling point, and the first power supply device 210 can also store power from the power grid to the energy storage device 510.

[0226] The second power supply device 220 can be connected to the power generation device 520, or connected to the energy storage device 510, or connected to both 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 light storage inverter.

[0227] 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.

[0228] It can be understood that the second power supply device 220 operates according to its own control strategy. The control method of the embodiment of the application does not directly control the action of the second power supply device 220 (i.e., the second power supply device 220 is not controlled). 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.

[0229] In actual execution, the first power supply device 210 is provided with a first controller 310, which can control the operating state of the first power supply device 210 according to an input signal. The second power supply device 220 is correspondingly provided with a second controller 320, which can control the operating state of the second power supply device 220 according to an input signal.

[0230] The following takes the control device of the power supply system as an example to introduce a specific embodiment.

[0231] As shown in Figure 2 , the current state of charge, coupling point voltage, coupling point frequency and other parameters are monitored, a primary control strategy and a secondary control strategy are adopted, and the power management of the power supply system is realized.

[0232] The primary control strategy can realize the maximum utilization of power generation power. The total controller 400 monitors the coupling point voltage U PCC or the coupling point frequency F Ref , takes the target coupling point voltage U Ref or the target coupling point frequency F Ref as a reference, and outputs the power reference value of the controllable first power supply device 210 P INV1_Ref , P INV2_Ref … P INVn_Refand distribute the power reference value to each first power supply device 210 P INV1_Ref 、 P INV2_Ref … P INVn_Ref , and perform closed-loop control.

[0233] 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 of the coupling point will rise, and the first power supply device 210 obtains the increased power instruction through the foregoing closed-loop control, increases power consumption, realizes the transfer of the power generation power of the second power supply device 220, and makes the second power supply device 220 orderly participate in the energy scheduling of the power supply system.

[0234] When the first power supply device 210 reaches the maximum consumption capacity, that is, the state of charge of the energy storage device 510 of the first power supply device 210 is too high or the charging power reaches a critical value, the remaining power of the second power supply device 220 can no longer be effectively consumed, at this time, the secondary control strategy is executed.

[0235] In addition, when the state of charge of the energy storage device 510 is too low or the discharging power reaches a critical value, in order to avoid the second power supply device 220 causing abnormal system voltage or frequency or further reducing the state of charge, the secondary control strategy can also be executed, and the output of the second power supply device 220 is coordinated through frequency adjustment or contactor on-off control, to trigger the second power supply device 220 to actively perform voltage abnormality protection or frequency abnormality protection.

[0236] According to the power supply system provided in the embodiments of the present application, by monitoring the current state of charge and the current charging and discharging power in real time, when the current state of charge or the current charging and discharging power exceeds the normal working range, the target control strategy is executed, so that the energy management of the multi-party power supply device can be realized without the need to establish communication, and the stable operation of the power supply system is ensured.

[0237] In some embodiments, as shown in Figure 9 the embodiments of the present application also provide an electronic device 900, which includes a processor 901, a memory 902, and a computer program stored in the memory 902 and executable on the processor 901. The program is executed by the processor 901 to realize each process of the embodiments of the control method of the power supply system described above, and can achieve the same technical effects. To avoid repetition, it will not be repeated here.

[0238] It should be noted that the electronic device in the embodiments of the present application includes the mobile electronic device and the non-mobile electronic device described above.

[0239] The embodiment of the present application further provides a non-transitory computer readable storage medium, which stores a computer program. The computer program is executed by a processor to implement each process of the control method of the power supply system and achieve the same technical effects. To avoid repetition, details are not described herein.

[0240] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0241] The embodiment of the present application further provides a computer program product, which includes a computer program. The computer program is executed by a processor to implement the control method of the power supply system.

[0242] The processor is the processor in the electronic device in the above embodiment. The readable storage medium includes a computer readable storage medium, such as a computer readable only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0243] The embodiment of the present application further provides a chip, which includes a processor and a communication interface. The communication interface is coupled with the processor. The processor is used to run a program or an instruction to implement each process of the control method of the power supply system and achieve the same technical effects. To avoid repetition, details are not described herein.

[0244] It should be understood that the chip mentioned in the embodiment of the present application can also be referred to as a system-level chip, a system chip, a chip system or a system-on-chip chip, etc.

[0245] It should be noted that, in this document, the term "comprising" or "including" or any other variant thereof is intended to cover non-exclusive inclusion, so that a process, method, article or apparatus including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such a process, method, article or apparatus. Without more limitations, the element defined by the statement "including a" does not exclude the presence of additional identical elements in the process, method, article or apparatus including the element. In addition, it should be pointed out that the scope of the method and apparatus in the present application is not limited to the order of performing the functions shown or discussed, but can also include performing the functions in a substantially simultaneous manner or in a reverse order, for example, the described method can be performed in an order different from that described, and various steps can be added, omitted or combined. In addition, the features described with reference to some examples can be combined in other examples.

[0246] Through the above description of the embodiments, those skilled in the art can clearly understand that the above-mentioned example methods can be realized by means of software and necessary general hardware platforms, and of course, can also be realized by hardware, but in many cases, the former is a better embodiment. Based on such understanding, the technical solutions of the present application can be embodied in the form of a computer software product in essence or in the form of a part of the prior art that makes a contribution. The computer software product is stored in a storage medium (such as a ROM / RAM, a magnetic disc, an optical disc), and includes a plurality of instructions for causing a terminal (which can be a mobile phone, a computer, a server, or a network device, etc.) to execute the methods described in the various embodiments of the present application.

[0247] The embodiments of the present application are described above in combination with the accompanying drawings, but the present application is not limited to the above-mentioned specific embodiments, and the above-mentioned specific embodiments are only illustrative and not restrictive. Those skilled in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope of protection of the claims.

[0248] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "an illustrative embodiment", "an example", "a specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0249] Although the embodiments of the present application have been shown and described, those skilled in the art can understand that various changes, modifications, replacements and variations can be made to the embodiments without departing from the principles and purposes of the present application, and the scope of the present application is defined by the claims and their equivalents.

Claims

1. A control method of a power supply system, characterized by, The power supply system comprises a first power supply device and a second power supply device, the first power supply device is connected with an energy storage device, the first power supply device and the second power supply device are connected to a coupling point, no communication connection is established between the first power supply device and the second power supply device, the first power supply device belongs to a controllable power supply device, the second power supply device belongs to an uncontrollable power supply device, and the second power supply device is uncontrolled; the control method comprises: obtaining the current state of charge and the current charging and discharging power of the energy storage device connected to the first power supply device; in the case where the current state of charge exceeds the target state of charge range, executing a target control strategy; wherein the execution of the target control strategy comprises controlling the disconnection of the contactor connected to the second power supply device to disconnect the second power supply device from the coupling point; in the case where the current state of charge exceeds the target state of charge range, executing the target control strategy further comprises: in the case where the current state of charge is greater than the maximum value of the target state of charge range, controlling the disconnection of the contactor connected to the second power supply device connected with a power generation device; or, in the case where the current state of charge is less than the minimum value of the target state of charge range, controlling the disconnection of the contactor connected to the second power supply device connected with an energy storage device; before the execution of the target control strategy, the method further comprises: obtaining the current coupling point parameter of the coupling point; using the current coupling point parameter as a feedback value and using a target coupling point parameter as a reference value to perform power control on the first power supply device.

2. The control method of a power supply system according to claim 1, characterized by, in the case where the current state of charge exceeds the target state of charge range, executing the target control strategy comprises: in the case where the current charging and discharging power does not exceed the target power range, executing the target control strategy in response to the current state of charge exceeding the target state of charge range; in the case where the current charging and discharging power exceeds the target power range, the method further comprises: in the case where the second power supply device is connected with a contactor and the second power supply device allows cutting out, controlling the disconnection of the contactor connected to the second power supply device.

3. The control method of a power supply system according to claim 1, characterized by, in the case where the current state of charge exceeds the target state of charge range, executing the target control strategy comprises: in the case where the current charging and discharging power does not exceed the target power range, executing the target control strategy in response to the current state of charge exceeding the target state of charge range; in the case where the current charging and discharging power exceeds the target power range, the method further comprises: in the case where the second power supply device is not connected with a contactor or the second power supply device does not allow cutting out, the voltage or frequency of the coupling point is abnormal, and the second power supply device automatically stops running.

4. A control device of a power supply system characterized by comprising: The power supply system comprises a first power supply device and a second power supply device, the first power supply device is connected with an energy storage device, the first power supply device and the second power supply device are connected to a coupling point, no communication connection is established between the first power supply device and the second power supply device, the first power supply device belongs to a controllable power supply device, the second power supply device belongs to an uncontrollable power supply device, and the second power supply device is uncontrolled; the control device comprises: An acquisition module is configured to acquire a current state of charge and a current charge-discharge power of the energy storage device connected to the first power supply device; A processing module is configured to execute a target control strategy when the current state of charge is out of a target state of charge range; The execution of the target control strategy comprises controlling disconnection of a contactor connected to the second power supply device to disconnect the second power supply device from the coupling point. The processing module is configured to execute the target control strategy when the current state of charge is out of the target state of charge range, and the execution of the target control strategy further comprises: controlling disconnection of the contactor connected to the second power supply device connected with a power generation device when the current state of charge is greater than a maximum value of the target state of charge range; or controlling disconnection of the contactor connected to the second power supply device connected with an energy storage device when the current state of charge is less than a minimum value of the target state of charge range. Before the execution of the target control strategy, the processing module is further configured to: acquire a current coupling point parameter of the coupling point; perform power control on the first power supply device by taking the current coupling point parameter as a feedback value and taking a target coupling point parameter as a reference value.

5. A power supply system characterized by comprising: The power supply system comprises: a first power supply device and a second power supply device, the first power supply device is connected with an energy storage device, the first power supply device and the second power supply device are connected to a coupling point, no communication connection is established between the first power supply device and the second power supply device, the first power supply device belongs to a controllable power supply device, the second power supply device belongs to an uncontrollable power supply device, and the second power supply device is uncontrolled; The control device of the power supply system according to claim 4 is connected with the contactor connected to the first power supply device and the second power supply device.

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