A method and terminal for reducing photovoltaic abandonment rate based on energy storage converter

Abstract

The present invention discloses a method and terminal for reducing the photovoltaic curtailment rate, which detects peak and valley sections of electricity consumption and the state of charge of an energy storage battery; adjusts the active power of an energy storage converter based on the peak and valley sections of electricity consumption and the state of charge of the energy storage battery; and adjusts the operating state of the photovoltaic module based on the active power of the energy storage converter. By detecting the peak and valley sections of electricity consumption, the present invention controls the transmission state of the energy storage converter, and adjusts the active power of the energy storage converter in real time based on the state of charge of the energy storage battery. Furthermore, the operating state of the photovoltaic module is adjusted based on the active power transmitted by the energy storage converter, thereby avoiding excessive power generation of the photovoltaic module, reducing the curtailment rate, and preventing surplus power from being connected to the grid.

Description

[0001] This case is a divisional application based on the invention patent with application date of 2024-3-22, application number 202410330333.4, and name “A method and terminal for reducing photovoltaic abandonment rate” as the parent case. Technical Field

[0002] The present invention relates to the field of energy storage, and in particular to a method and a terminal for reducing photovoltaic abandonment rate. Background Art

[0003] With the development of energy storage technology, the combination of industrial and commercial photovoltaics and energy storage is gaining widespread recognition. The relatively low investment risk and stable returns of industrial and commercial photovoltaics have attracted increasing attention from investors. In particular, DC photovoltaics with energy storage technology can not only effectively solve the problem of curtailed solar power and promote the consumption of renewable energy, but also smooth out power fluctuations, reduce peaks and valleys, and regulate frequency and voltage. This is a key means of meeting the needs of large-scale renewable energy access to the grid.

[0004] However, with the increasing proportion of energy storage systems connected to the photovoltaic, storage, charging and testing architecture, the problems of power fluctuation and unpredictable output in photovoltaic power generation are becoming increasingly prominent. When the energy storage battery is charged with current limit or the AC load demand decreases, varying degrees of power curtailment and power rationing will occur. This not only wastes electricity and reduces users' power generation revenue, but also has an increasingly significant impact on the safe and stable operation of the entire energy storage power station. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to provide a method and terminal for reducing the photovoltaic abandonment rate, thereby reducing the photovoltaic abandonment rate in the photovoltaic storage charging and detection architecture.

[0006] In order to solve the above technical problems, the technical solution adopted by the present invention is:

[0007] A method for reducing photovoltaic abandonment rate, comprising the steps of:

[0008] S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0009] S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0010] S3. Adjust the working state of the photovoltaic module according to the active power of the energy storage converter.

[0011] In order to solve the above technical problems, another technical solution adopted by the present invention is:

[0012] A terminal for reducing photovoltaic curtailment rate includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the following steps are performed:

[0013] S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0014] S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0015] S3. Adjust the working state of the photovoltaic module according to the active power of the energy storage converter.

[0016] The beneficial effects of the present invention are: providing a method and terminal for reducing the photovoltaic curtailment rate, controlling the transmission state of the energy storage inverter by detecting the peak and valley sections of electricity consumption, and adjusting the active power of the energy storage inverter in real time according to the charge state of the energy storage battery, and then adjusting the working state of the photovoltaic module according to the active power transmitted by the energy storage inverter, avoiding excessive power generation of the photovoltaic module, reducing the curtailment rate, and achieving the goal of not connecting surplus power to the grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Flowchart of a method for reducing photovoltaic abandonment rate in an embodiment of the present invention;

[0018] Figure 2 Schematic diagram of an execution architecture of a method for reducing photovoltaic curtailment rate according to an embodiment of the present invention;

[0019] Figure 3 Schematic diagram of a terminal for reducing photovoltaic abandonment rate in an embodiment of the present invention;

[0020] Description of labels:

[0021] 1. Terminals that reduce the photovoltaic power curtailment rate; 2. Memory; 3. Processor. DETAILED DESCRIPTION

[0022] To illustrate the technical content, achieved objectives and effects of the present invention in detail, the following description is given in conjunction with the embodiments and accompanying drawings.

[0023] Please refer to Figure 1 as well as Figure 2 , a method for reducing photovoltaic abandonment rate, comprising the steps of:

[0024] S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0025] S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0026] S3. Adjust the working state of the photovoltaic module according to the active power of the energy storage converter.

[0027] It should be noted that the embodiments of the present invention are applied to photovoltaic storage and charging inspection stations in industrial and commercial photovoltaics, such as Figure 2 As shown, it generally includes photovoltaic arrays (modules), battery packs (energy storage batteries), photovoltaic and storage integrated machines, and energy storage converters (PCS). The energy storage converter converts DC power into AC power and outputs it to external loads, or converts power from the external grid into DC power to charge the internal energy storage batteries.

[0028] From the above description, it can be seen that the beneficial effects of the present invention are: by detecting the peak and valley sections of electricity consumption, the transmission state of the energy storage inverter is controlled, and the active power of the energy storage inverter is adjusted in real time according to the charge state of the energy storage battery, and then the working state of the photovoltaic module is adjusted according to the active power transmitted by the energy storage inverter, thereby avoiding excessive power generation of the photovoltaic module, reducing the abandonment rate, and achieving the goal of not connecting surplus power to the grid.

[0029] In an embodiment of the present invention, step S2 is specifically as follows:

[0030] S21, obtaining the peak and valley sections of electricity consumption. If the peak and valley sections of electricity consumption are peak sections, proceed to step S22; otherwise, proceed to step S23;

[0031] S22. Calculate the actual discharge power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power output by the energy storage converter to be the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module;

[0032] S23. Calculate the actual charging power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module.

[0033] It should be noted that in order to save electricity costs, in the photovoltaic storage charging and testing system, energy storage batteries and photovoltaic panels are usually used to power the AC load during peak power periods, and an external power grid tends to be used to supplement or supply power to the energy storage system during valley or flat power periods.

[0034] Based on the above setting principle, when the electricity consumption time is in the peak power section, the actual discharge power of the energy storage battery is calculated according to its state of charge. For example, the maximum discharge power of the energy storage battery and the actual discharge power of the corresponding charge reduction coefficient calculator are obtained, and the active power output of the energy storage converter is controlled to be the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module. That is, at this time, the energy storage battery and photovoltaic module are used to supply power to the outside, and the conversion power of the energy storage converter is guaranteed to meet the sum of the two, avoiding the phenomenon of curtailment of light. When the electricity consumption time is in the valley power section, the external power grid is used to supplement the power of the photovoltaic storage charging and testing system. The power input of the external power grid through the energy storage converter (the active power transmitted internally by the energy storage converter) is the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module. That is, at this time, the power generation power of the photovoltaic module is given priority, and the external power grid is used to supplement the power of the energy storage battery to avoid the phenomenon of curtailment of the photovoltaic module.

[0035] In an embodiment of the present invention, step S23 is specifically as follows:

[0036] S231: Set a first charge value and a second charge value, where the first charge value is greater than the second charge value, and compare the state of charge of the energy storage battery, the first charge value, and the second charge value. If the state of charge of the energy storage battery is less than the second charge value, proceed to step S232; if the state of charge of the energy storage battery is between the first charge value and the second charge value, proceed to step S233; otherwise, proceed to step S234;

[0037] S232, controlling the external power grid and the photovoltaic module to simultaneously charge the energy storage battery, and controlling the active power transmitted internally by the energy storage converter to be the difference between the actual charging power of the energy storage battery and the discharging power of the photovoltaic module;

[0038] When the state of charge of the energy storage battery is less than the second charge value, the energy storage battery is recharged by the external power grid and the photovoltaic components at the same time, and the transmission power of the energy storage converter is controlled by giving priority to the discharge condition of the photovoltaic components.

[0039] S233, individually controlling the photovoltaic modules to supplement the energy storage battery, and controlling the active power of the energy storage converter to be zero;

[0040] When the state of charge of the energy storage battery is between the first charge value and the second charge value, there is no need to use the external power grid for internal power replenishment. The internal transmission power of the energy storage inverter is set to zero, and the energy storage battery is charged by the photovoltaic module alone, so that all the electricity generated by the photovoltaic module is input into the energy storage battery.

[0041] S234. The electric energy generated by the photovoltaic module is directly transmitted to the energy storage converter, and the active power transmitted to the outside by the energy storage converter is controlled to be the actual discharge power of the photovoltaic module.

[0042] When the state of charge of the energy storage battery is greater than or equal to the first charge value, it means that the energy storage battery has reached the optimal discharge state and does not need to be charged. At the same time, it is still in the valley power or flat power section. In order to avoid photovoltaic curtailment, the energy storage converter is controlled to transmit all the electric energy generated by the photovoltaic module to the load, and the active power transmitted by the energy storage converter is controlled to the actual discharge power of the photovoltaic module.

[0043] In an embodiment of the present invention, step S234 further includes:

[0044] The AC load demand power is obtained and compared with the actual discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

[0045] From the above description, it can be seen that in the valley or flat section, the AC load demand power is considered at the same time and compared with the actual discharge power of the photovoltaic module. The minimum value is taken as the active power output of the energy storage inverter to prevent the electric energy generated by the photovoltaic module from exceeding the load demand. When the load demand is less than the discharge power of the photovoltaic module, the power value of the photovoltaic module is limited in step S3 to avoid curtailment of light while realizing the principle of not connecting surplus power to the grid.

[0046] In an embodiment of the present invention, step S22 further includes:

[0047] The AC load demand power is obtained and compared with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

[0048] As above, in the peak power section, the AC load demand power is considered at the same time, and compared with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module. The minimum value is taken as the active power output of the energy storage inverter to avoid the electric energy generated by the photovoltaic module exceeding the load demand. When the load demand is less than the discharge power of the photovoltaic module, the power value of the photovoltaic module is limited in step S3 to avoid curtailment of light while realizing the principle of not connecting surplus power to the grid.

[0049] A terminal for reducing photovoltaic curtailment rate includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps in the above-mentioned method for reducing photovoltaic curtailment rate are completed.

[0050] From the above description, it can be seen that an execution carrier of a method for reducing the photovoltaic curtailment rate is provided. When executing the above method, the transmission state of the energy storage inverter is controlled by detecting the peak and valley sections of electricity consumption, and the active power of the energy storage inverter is adjusted in real time according to the charge state of the energy storage battery. Then, the working state of the photovoltaic module is adjusted according to the active power transmitted by the energy storage inverter, so as to avoid excessive power generation of the photovoltaic module, reduce the curtailment rate, and realize that the surplus power is not connected to the grid.

[0051] The present invention provides a method and terminal for reducing the photovoltaic curtailment rate, which is mainly used to control the curtailment rate of a photovoltaic storage charging and detection system. The method and terminal are described in detail below with reference to an embodiment.

[0052] Please refer to Figures 1 to 2 , embodiment 1 of the present invention is:

[0053] A method for reducing photovoltaic abandonment rate, comprising the steps of:

[0054] S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0055] S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery;

[0056] Step S2 is specifically as follows:

[0057] S21, obtaining the peak and valley sections of electricity consumption. If the peak and valley sections of electricity consumption are peak sections, proceed to step S22; otherwise, proceed to step S23;

[0058] S22. Calculate the actual discharge power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power output by the energy storage converter to be the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module;

[0059] The system also includes the steps of obtaining the AC load power demand and comparing it with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module, taking the minimum value as the active power output by the energy storage inverter. During peak power periods, the AC load power demand is also considered and compared with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module, taking the minimum value as the active power output by the energy storage inverter. This prevents the power generated by the photovoltaic module from exceeding the load demand. If the load demand is less than the discharge power of the photovoltaic module, the power value of the photovoltaic module is limited in step S3, avoiding curtailment of solar power while ensuring that surplus power is not connected to the grid.

[0060] S23. Calculate the actual charging power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module.

[0061] Step S23 is specifically as follows:

[0062] S231, setting a first charge value and a second charge value, where the first charge value is greater than the second charge value, comparing the state of charge of the energy storage battery, the first charge value, and the second charge value; if the state of charge of the energy storage battery is less than the second charge value, proceeding to step S232; if the state of charge of the energy storage battery is between the first charge value and the second charge value, proceeding to step S233; otherwise, proceeding to step S234;

[0063] S232. Control the external power grid and photovoltaic modules to simultaneously charge the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic modules. When the state of charge of the energy storage battery is less than the second charge value, the external power grid and photovoltaic modules are used to simultaneously charge the energy storage battery, and the transmission power of the energy storage converter is controlled with priority given to the discharge condition of the photovoltaic modules.

[0064] S233. Control the photovoltaic assembly alone to charge the energy storage battery, and control the active power of the energy storage converter to be zero; when the state of charge of the energy storage battery is between the first charge value and the second charge value, there is no need to use the external power grid for internal power replenishment, set the internal transmission power of the energy storage converter to zero, and use the photovoltaic assembly alone to charge the energy storage battery, so that all the electricity generated by the photovoltaic assembly is input into the energy storage battery.

[0065] S234: Directly transmit the electrical energy generated by the photovoltaic module to the energy storage converter, and control the active power transmitted by the energy storage converter to be equal to the actual discharge power of the photovoltaic module. When the state of charge of the energy storage battery is greater than or equal to the first charge value, indicating that the energy storage battery has reached an optimal discharge state and does not need to be charged, and is also in a valley or flat power range, to avoid photovoltaic curtailment, control the energy storage converter to transmit all the electrical energy generated by the photovoltaic module to the load, and control the active power transmitted by the energy storage converter to be equal to the actual discharge power of the photovoltaic module.

[0066] The system also includes obtaining the AC load power demand and comparing it with the actual discharge power of the PV modules, taking the minimum of the two as the active power output of the energy storage inverter. During off-peak and high-peak periods, the AC load power demand is also considered and compared with the actual discharge power of the PV modules, taking the minimum as the active power output of the energy storage inverter. This prevents the power generated by the PV modules from exceeding the load demand. If the load demand is less than the PV module discharge power, the PV module power is limited in step S3, preventing curtailment while ensuring that surplus power is not connected to the grid.

[0067] S3. Adjust the working state of the photovoltaic module according to the active power of the energy storage converter.

[0068] That is, in this embodiment, by detecting the peak-valley section of power consumption, the transmission state of the energy storage converter is controlled, and according to the state of charge of the energy storage battery, the active power of the energy storage converter is adjusted in real time. Furthermore, according to the active power transmitted by the energy storage converter, the working state of the photovoltaic module is adjusted to avoid excessive power generation of the photovoltaic module, reduce the light rejection rate, and achieve the non-grid connection of surplus electricity.

[0069] Please refer to Figures 1 to 2 , Embodiment 2 of the present invention is as follows: On the basis of Embodiment 1, the method for reducing the photovoltaic light rejection rate is actually applied as follows:

[0070] 1. Collect the total active power P1 of the grid-side meter, the active power P2 of the energy storage converter, and the DC photovoltaic power P3 in real time, and calculate the AC load P4 = P1 - P2 according to the above data;

[0071] 2. Calculate the maximum discharge power P5 and the maximum charge power P6 of the battery in real time according to the battery charge and discharge current limit value;

[0072] 3. Set the DC photovoltaic charge warning value SOC1 (the first state of charge value), the AC discharge coefficient W1; the battery discharge coefficient W2; the photovoltaic AC discharge coefficient W3; the battery charge coefficient W4. The actual operating power is obtained by connecting the above coefficients with the corresponding rated power, that is, P5 * W2 is the actual discharge power of the battery, P6 * W4 is the actual charge power of the battery, and P4 * W1 is the actual power consumption of the AC load.

[0073] 4. During peak power time, the direct current generated by the DC photovoltaic module is converted into alternating current through the energy storage converter. When the power generated by the DC photovoltaic is insufficient or the photovoltaic power generation system stops working, the energy storage battery can release direct current and convert it into alternating current through the energy storage converter for local load use. Adjust the active power of the energy storage converter P = Min(P4 * W1, P5 * W2 + P3), that is, obtain the power demand of the AC load, and compare it with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module, and take the minimum value of the two as the active power output by the energy storage converter to the outside.

[0074] 5. During valley power or flat power time, set the grid power supply cut-off SOC3 (the second state of charge value), and ensure that SOC3 < SOC1. The transmitted active power of the energy storage converter is P5; when the actual state of charge SOC2 of the energy storage battery < SOC3, the grid and the DC photovoltaic supply power to the energy storage battery at the same time, and issue the active power of the energy storage converter P = Min(P6 * W4 - P3, P5), that is, control the active power transmitted by the energy storage converter to the inside to be the minimum value of the difference between the actual charge power of the energy storage battery and the discharge power of the photovoltaic module compared with the maximum discharge power of the battery;

[0075] When the energy storage battery SOC2 is located between SOC3 and SOC1, the DC photovoltaic system replenishes the energy storage battery and sends the energy storage converter active power P = 0;

[0076] When the energy storage battery SOC2>=SOC1, the active power value of the energy storage converter is set to convert the DC power generated by the DC photovoltaic module into AC power, which is preferentially used by the local AC load. The active power of the energy storage converter P=Min(P4*W1, P3*W3) is sent, that is, the AC load demand power is obtained and compared with the actual discharge power of the photovoltaic module, and the minimum value of the two is taken as the active power output of the energy storage converter.

[0077] 6. During off-peak or peak hours, when photovoltaic power generation cannot be effectively absorbed, P3 is greater than P6 and P4, and the DC photovoltaic power limit value P = P6 + P4 is issued.

[0078] Please refer to Figure 3 , the third embodiment of the present invention is:

[0079] A terminal 1 for reducing the photovoltaic curtailment rate includes a memory 2, a processor 3, and a computer program stored in the memory 2 and executable on the processor 3. When the processor executes the computer program, the steps of any one of the methods for reducing the photovoltaic curtailment rate in the above-mentioned embodiments 1 to 2 are completed.

[0080] In summary, the present invention provides a method and terminal for reducing the photovoltaic curtailment rate, which controls the transmission state of the energy storage inverter by detecting the peak and valley sections of electricity consumption, and adjusts the active power of the energy storage inverter in real time according to the charge state of the energy storage battery, and then adjusts the working state of the photovoltaic module according to the active power transmitted by the energy storage inverter, thereby avoiding excessive power generation of the photovoltaic module, reducing the curtailment rate, and achieving the goal of not connecting the surplus power to the grid.

[0081] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent transformations made using the contents of the present invention's description and drawings, or directly or indirectly applied in related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A method for reducing photovoltaic power abandonment rate, characterized by: Including steps: S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery; Obtain the total active power P1 of the grid-side electric meter, the active power P2 of the energy storage converter, and the discharge power P3 of the photovoltaic module, and calculate the AC load P4 = P1 - P2 based on the above data; Calculate the battery maximum discharge power P5 and battery maximum charge power P6 in real time based on the battery charge and discharge current limit value; Set the DC photovoltaic power replenishment alarm value as the first charge value, set the grid power supply cutoff value as the second charge value, obtain the AC discharge coefficient W1, battery discharge coefficient W2, photovoltaic AC discharge coefficient W3; battery charging coefficient W4, and combine the above coefficients with the corresponding rated power to obtain the actual operating power, that is, P5*W2 is the actual discharge power of the energy storage battery, P6*W4 is the actual charging power of the energy storage battery, P4*W1 is the AC load demand power, and P3*W3 is the actual discharge power of the photovoltaic module; S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery; S3, adjusting the working state of the photovoltaic module according to the active power of the energy storage converter; The step S2 is specifically as follows: S21, obtaining the peak and valley sections of electricity consumption. If the peak and valley sections of electricity consumption are peak sections, proceed to step S22; otherwise, proceed to step S23; S22. Calculate the actual discharge power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power output by the energy storage converter to be the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module; S23. Calculate the actual charging power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the minimum value of the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module and the maximum discharge power of the battery.

2. The method for reducing photovoltaic power abandonment rate according to claim 1, characterized in that: The step S23 is specifically as follows: S231: Set a first charge value and a second charge value, where the first charge value is greater than the second charge value, and compare the state of charge of the energy storage battery, the first charge value, and the second charge value. If the state of charge of the energy storage battery is less than the second charge value, proceed to step S232; if the state of charge of the energy storage battery is between the first charge value and the second charge value, proceed to step S233; otherwise, proceed to step S234; S232, controlling the external power grid and the photovoltaic module to simultaneously charge the energy storage battery, and controlling the active power transmitted internally by the energy storage converter to be the minimum value of the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module and the maximum discharge power of the battery; S233, individually controlling the photovoltaic modules to supplement the energy storage battery, and controlling the active power of the energy storage converter to be zero; S234. The electric energy generated by the photovoltaic module is directly transmitted to the energy storage converter, and the active power transmitted to the outside by the energy storage converter is controlled to be the actual discharge power of the photovoltaic module.

3. The method for reducing photovoltaic power abandonment rate according to claim 2, characterized in that: The step S234 further includes the following steps: The AC load demand power is obtained and compared with the actual discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

4. The method for reducing photovoltaic power abandonment rate according to claim 1, characterized in that: The step S22 further comprises the steps of: The AC load demand power is obtained and compared with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

5. A terminal for reducing photovoltaic power abandonment rate, characterized by: The invention comprises 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 following steps are performed: S1. Detect peak and valley sections of electricity consumption and the state of charge of the energy storage battery; Obtain the total active power P1 of the grid-side electric meter, the active power P2 of the energy storage converter, and the discharge power P3 of the photovoltaic module, and calculate the AC load P4 = P1 - P2 based on the above data; Calculate the battery maximum discharge power P5 and battery maximum charge power P6 in real time based on the battery charge and discharge current limit value; Set the DC photovoltaic power replenishment alarm value as the first charge value, set the grid power supply cutoff value as the second charge value, obtain the AC discharge coefficient W1, battery discharge coefficient W2, photovoltaic AC discharge coefficient W3; battery charging coefficient W4, and combine the above coefficients with the corresponding rated power to obtain the actual operating power, that is, P5*W2 is the actual discharge power of the energy storage battery, P6*W4 is the actual charging power of the energy storage battery, P4*W1 is the AC load demand power, and P3*W3 is the actual discharge power of the photovoltaic module; S2. Adjust the active power of the energy storage converter according to the peak and valley sections of electricity consumption and the state of charge of the energy storage battery; S3, adjusting the working state of the photovoltaic module according to the active power of the energy storage converter; The step S2 is specifically as follows: S21, obtaining the peak and valley sections of electricity consumption. If the peak and valley sections of electricity consumption are peak sections, proceed to step S22; otherwise, proceed to step S23; S22. Calculate the actual discharge power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power output by the energy storage converter to be the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module; S23. Calculate the actual charging power of the energy storage battery according to the state of charge of the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the minimum value of the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module and the maximum discharge power of the battery.

6. The terminal for reducing photovoltaic curtailment rate according to claim 5, characterized in that: The step S23 is specifically as follows: S231: Set a first charge value and a second charge value, where the first charge value is greater than the second charge value, and compare the state of charge of the energy storage battery, the first charge value, and the second charge value. If the state of charge of the energy storage battery is less than the second charge value, proceed to step S232; if the state of charge of the energy storage battery is between the first charge value and the second charge value, proceed to step S233; otherwise, proceed to step S234; S232. Control the external power grid and the photovoltaic module to simultaneously charge the energy storage battery, and control the active power transmitted internally by the energy storage converter to be the minimum value of the difference between the actual charging power of the energy storage battery and the discharge power of the photovoltaic module and the maximum discharge power of the battery; S233, individually controlling the photovoltaic modules to supplement the energy storage battery, and controlling the active power of the energy storage converter to be zero; S234. The electric energy generated by the photovoltaic module is directly transmitted to the energy storage converter, and the active power transmitted to the outside by the energy storage converter is controlled to be the actual discharge power of the photovoltaic module.

7. The terminal for reducing photovoltaic curtailment rate according to claim 6, characterized in that: The step S234 further includes the following steps: The AC load demand power is obtained and compared with the actual discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

8. The terminal for reducing photovoltaic curtailment rate according to claim 5, characterized in that: The step S22 further comprises the steps of: The AC load demand power is obtained and compared with the sum of the actual discharge power of the energy storage battery and the discharge power of the photovoltaic module. The minimum value of the two is taken as the active power output by the energy storage converter.

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