Control method and device of optical storage equipment, electronic equipment and readable storage medium

Abstract

The application provides a control method and device of a light storage device, electronic equipment and a readable storage medium. The control method of the light storage device comprises: adjusting the output power of an inverter according to a preset first reference reactive power value; detecting a first reactive power value of the inductance of a filter; obtaining a second reactive power value of a current transformer; obtaining a first reactive power difference value based on the first reactive power value and the second reactive power value; adjusting the output power of the inverter according to a preset second reference reactive power value; detecting a third reactive power value of the inductance of the filter; obtaining a fourth reactive power value of the current transformer; obtaining a second reactive power difference value based on the third reactive power value and the fourth reactive power value; obtaining the operating state of the current transformer according to a reactive power output limit value, the first reactive power difference value and the second reactive power difference value; and the second reference reactive power value is the opposite number of the first reference reactive power value. The reactive power value is adjusted to determine the current transformer fault type, the influence on the active power is reduced, and the equipment stability is improved.

Description

Technical Field

[0001] This invention relates to the field of optical storage equipment technology, and more specifically, to a control method, apparatus, electronic device, and readable storage medium for optical storage equipment. Background Technology

[0002] Currently, in related technologies, current transformers are installed on the grid-connected side of the inverter in photovoltaic and energy storage (PV) systems. To ensure stable power transmission from PV and energy storage systems to the grid, the current transformers need to monitor the power output on the grid-connected side in real time. Therefore, to improve the operational stability of PV and energy storage systems, it is necessary to ensure the stable operation of the current transformers. This requires controlling the output power of the inverter to observe the feedback from the current transformers and determining the fault type of the current transformers based on the feedback.

[0003] To reduce the impact of adjusting the inverter's output power on grid stability, it is necessary to reduce the magnitude of output power fluctuations. However, reducing the magnitude of output power fluctuations can affect the accuracy of the detected operating status of the current transformer, thereby affecting the determination of the fault type of the current transformer. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art or related art.

[0005] Therefore, the first aspect of the present invention proposes a control method for a photovoltaic storage device.

[0006] A second aspect of the present invention provides a control device for a photovoltaic storage device.

[0007] A third aspect of the present invention provides an electronic device.

[0008] A fourth aspect of the present invention provides a readable storage medium.

[0009] In view of this, a first aspect of the present invention provides a control method for a photovoltaic energy storage device. The photovoltaic energy storage device includes an inverter and a current transformer, the current transformer being disposed on the grid-connected side of the inverter, and a filter being disposed inside the inverter. The control method for the photovoltaic energy storage device includes: acquiring a preset first reference reactive power value and adjusting the output power of the inverter according to the first reference reactive power value; detecting a first reactive power value of the inductance of the filter; acquiring a second reactive power value of the current transformer; acquiring a first reactive power difference value based on the first and second reactive power values; acquiring a preset second reference reactive power value and adjusting the output power of the inverter according to the second reference reactive power value; detecting a third reactive power value of the inductance of the filter; acquiring a fourth reactive power value of the current transformer; acquiring a second reactive power difference value based on the third and fourth reactive power values; acquiring a preset reactive power output limit value; and acquiring the operating state of the current transformer according to the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value; wherein the second reference reactive power value is the opposite of the first reference reactive power value.

[0010] This application provides a control method for a photovoltaic (PV) energy storage device. The PV energy storage device includes an inverter and a current transformer. The current transformer is located on the grid-connected side of the inverter and can provide real-time feedback of the grid-feed current of the PV energy storage device to the inverter. This ensures stable power transmission and improves the operational stability of the PV energy storage device when it is connected to the grid. The inverter has an internal filter. The control method includes using a reactive power control loop to control the inverter's current loop. Specifically, a first reference reactive power value preset within the PV energy storage device is obtained, which is then introduced into the reactive power control loop. The first reference reactive power value is used to adjust the inverter's output power. The inductor current of the current filter is detected, and a first reactive power value of the inductor is calculated. The current transformer is controlled to detect the current, and a second reactive power value of the current transformer is calculated based on the detected current. Finally, a first reactive power difference value is obtained based on the first and second reactive power values. The above steps yield the difference between the reactive power value at the inductor within the inverter and the reactive power value fed back from the current transformer. Then, a reference reactive power value is obtained again, specifically the second preset reference reactive power value within the photovoltaic energy storage device. The inverter's output power is adjusted based on this second reference reactive power value. The third reactive power value of the filter inductor is detected. The fourth reactive power value of the current transformer is obtained. Based on the third and fourth reactive power values, a second reactive power difference is obtained. The operating status of the current transformer is obtained based on the first and second reactive power differences. By employing a reactive power control loop, the reactive power values ​​fed back by the inductor and current transformer under different reference reactive power values ​​are detected to obtain a first reactive power difference and a second reactive power difference. Then, by comparing the magnitudes of the first and second reactive power differences with the reference reactive power values, the operating status of the current transformer can be detected. Through reactive power difference comparison, different reactive power reference values ​​can be adjusted to determine the fault type of the current transformer, reducing the impact on active power and thus avoiding affecting the power generation and system stability of the photovoltaic-storage integrated system. The second reference reactive power value is the opposite of the first reference reactive power value.

[0011] By introducing a reactive power control loop, large fluctuations in output power can be avoided, thus preventing any impact on the power generation and system stability of the integrated photovoltaic-storage system. The reactive power difference is obtained by subtracting the reactive power values ​​fed back from the current transformer and those at the inductor under different reference reactive power conditions. By determining the magnitude of this reactive power difference from the reference reactive power value, the fault type of the current transformer can be identified, improving the accuracy of current transformer operation status detection.

[0012] This technical solution provides a control method for a photovoltaic storage device. In addition to the technical features of the above-mentioned technical solution, this technical solution further includes the following technical features.

[0013] In some technical solutions of the present invention, optionally, the operating state of the current transformer is obtained based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, including: obtaining a third reactive power difference value based on the first reactive power difference value and the second reactive power difference value; and determining that the operating state of the current transformer is a normal operating state when the absolute value of the third reactive power difference value is less than the absolute value of the reactive power output limit value.

[0014] In this technical solution, the step of obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value includes obtaining the third reactive power difference value based on the first and second reactive power difference values. That is, based on obtaining the first and second reactive power difference values, i.e., the two reactive power difference values ​​between the current transformer and the inductor, the difference between the two reactive power difference values ​​is taken to obtain the third reactive power difference value. When the absolute value of the third reactive power difference value is less than the absolute value of the first reference reactive power value, the operating status of the current transformer is in normal operation. In the operation of the photovoltaic energy storage device, the operating status of the current transformer can be dynamically identified by introducing a reactive power reference value without affecting the active power output of the photovoltaic energy storage device, thus improving the stability of the device.

[0015] Optionally, in some technical solutions of the present invention, after obtaining the operating state of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: when the operating state of the current transformer is in normal operation, controlling the current transformer to detect the first feeder current value and feeding back the first feeder current value to the inverter, and jumping to obtain a preset first reference reactive power value.

[0016] In this technical solution, after obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: after comparing the third reactive power difference value with the reactive power output limit value, it can be determined that the current transformer is in normal operating condition. Based on the operating status of the current transformer being in normal operating condition, the current transformer is controlled to detect the first feed current value and feed it back to the inverter. This can realize real-time feedback of the feed current value of the photovoltaic energy storage device and continuously obtain the first reactive power reference value. The reactive power values ​​of the current transformer and the inductor are compared multiple times to realize continuous self-checking of the current transformer.

[0017] Furthermore, when the first reference reactive power value is set to 50var, if the current transformer is operating normally, the reactive power value calculated based on the first feeder current value fed back by the current transformer should be 50var. Therefore, the difference between the first reactive power difference and the second reactive power difference should be greater than or equal to 0var and less than 50var. Thus, by comparing the third reactive power difference with the first reference reactive power value, the operating status of the current transformer can be identified, improving the stability of equipment operation.

[0018] In some technical solutions of the present invention, optionally, the operating state of the current transformer is obtained based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, including: obtaining a third reactive power difference value based on the first reactive power difference value and the second reactive power difference value; when the absolute value of the third reactive power difference value is greater than the absolute value of the reactive power output limit value, the operating state of the current transformer is determined to be an abnormal operating state.

[0019] In this technical solution, the step of obtaining the operating status of the current transformer based on the first reactive power difference and the second reactive power difference includes: obtaining the third reactive power difference based on the reactive power output limit value, the first reactive power difference, and the second reactive power difference; when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit value, the operating status of the current transformer is an abnormal operating state. When a current transformer is in a fault state, the reactive power value fed back by the current transformer can be the opposite of the first reference reactive power value or the feedback reactive power value can be 0var. Therefore, by setting different reactive power reference values ​​and obtaining the reactive power difference between the inductor and the current transformer when different reactive power reference values ​​are set, namely the first reactive power difference and the second reactive power difference, the third reactive power difference can be obtained by judging the difference between the first reactive power difference and the second reactive power difference. When the absolute value of the third reactive power difference is greater than the preset reactive power output limit value, since the current detected at the inductor is the bus current, the absolute value of the third reactive power difference is greater than the preset reactive power output limit value, which proves that the third reactive power difference, i.e., the current transformer is abnormal. Therefore, it is judged that the current transformer is in an abnormal working state at this time.

[0020] Optionally, in some technical solutions of the present invention, when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, the operating state of the current transformer is determined to be an abnormal operating state, including: when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, but less than three times the absolute value of the reactive power output limit, the operating state of the current transformer is determined to be an open state.

[0021] In this technical solution, the operating state of the current transformer is determined to be abnormal based on the absolute value of the third reactive power difference being greater than the absolute value of the reactive power output limit. This includes: when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit but less than three times the absolute value of the reactive power output limit, the current transformer is in an open state. When the current transformer is in an open state, the reactive power value fed back at the current transformer is 0var. The reactive power value detected at the inductor minus the reactive power value fed back at the current transformer is the maximum value of the first reactive power difference. Similarly, since the obtained second reference reactive power value is the opposite of the first reference reactive power value, the obtained second reactive power difference should be the opposite of the first reactive power difference. Therefore, the third reactive power difference should be less than three times the absolute value of the first reference reactive power value and twice the absolute value of the reactive power output limit. Thus, it can be determined that the reactive power value detected at the current transformer is 0var, i.e., the current transformer is in an open state.

[0022] Optionally, in some technical solutions of the present invention, after obtaining the operating state of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: based on the operating state of the current transformer being in an open state, detecting the first current value of the inductor, and controlling the current transformer to feed back the first current value to the inverter.

[0023] In this technical solution, after obtaining the operating status of the current transformer, the control method for the photovoltaic energy storage device further includes: based on the current transformer's operating status being open, detecting the first current value of the inductor, and controlling the current transformer to feed back the first current value to the inverter. When the current transformer detects an open problem, the feedback quantity related to the current transformer can be changed to the current at the inductor, and a current transformer disconnection warning can be reported. Without affecting operation, the device awaits inspection by maintenance personnel. This allows for dynamic identification of the current transformer's operating status during photovoltaic energy storage device operation by introducing a reactive power reference value, without affecting the active power output of the photovoltaic energy storage device, thus improving the device's stability.

[0024] Optionally, in some technical solutions of the present invention, when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, the operating state of the current transformer is determined to be an abnormal operating state, including: when the absolute value of the third reactive power difference is greater than three times the absolute value of the reactive power output limit, the current transformer is in a reverse connection state.

[0025] In this technical solution, the operating state of the current transformer is determined to be abnormal when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit. This includes: when the absolute value of the third reactive power difference is greater than three times the absolute value of the reactive power output limit, the current transformer is in a reverse connection state. Since the first reference reactive power value is a reference reactive power value obtained based on the control loop, it can be determined that the current transformer is in a reverse connection state when the absolute value of the third reactive power difference is greater than three times the absolute value of the reactive power output limit.

[0026] Optionally, in some technical solutions of the present invention, after obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: controlling the current transformer to detect the second feeder current value and obtain the opposite value of the second feeder current value based on the current transformer being in a reverse connection state; and controlling the current transformer to feed back the opposite value of the second feeder current value to the inverter.

[0027] In this technical solution, after obtaining the operating status of the current transformer based on the first and second reactive power difference values, the control method for the photovoltaic-storage equipment further includes: if the current transformer is in a reverse connection state, controlling the current transformer to detect the second feeder current value and obtaining the opposite of the second feeder current value; controlling the current transformer to feed back the opposite of the second feeder current value to the inverter. When a reverse connection fault is detected in the current transformer, the feeder current value fed back by the current transformer can be retained, and the opposite of this current value can be obtained. Then, the self-test state continues, and the self-test will pass in the second round, thus resolving the fault. At the same time, the photovoltaic-storage equipment reports a reverse connection warning, which can ensure normal operation while waiting for maintenance, improving the stability of equipment operation.

[0028] Optionally, in some technical solutions of the present invention, before obtaining a preset first reference reactive power value and adjusting the output power of the inverter according to the first reference reactive power value, the control method of the photovoltaic energy storage device further includes: receiving a current transformer control signal; when the current transformer control signal is an open detection signal, jumping to obtain the preset first reference reactive power value; when the current transformer control signal is an closed detection signal, controlling the current transformer to obtain the third feeder current value and feeding back the third feeder current value to the inverter.

[0029] In this technical solution, before acquiring the first reference reactive power value and adjusting the inverter's output power based on it, the control method for the photovoltaic-storage equipment further includes: receiving a current transformer control signal, i.e., controlling whether to detect the current transformer based on an external enable signal. If the current transformer control signal is an enabled detection signal, the system jumps to acquire the first reference reactive power value, i.e., acquiring the operating status of the current transformer, thus enabling status detection of the current transformer. When the current transformer control signal is a disabled detection signal, i.e., the photovoltaic-storage equipment no longer performs fault detection on the current transformer, it then controls the current transformer to acquire the third feeder current value and feeds it back to the inverter, achieving real-time feedback of the feeder current by the current transformer and shielding against current transformer faults.

[0030] A second aspect of this application provides a control device for a photovoltaic energy storage device, comprising a first acquisition module, a first detection module, a second acquisition module, a third acquisition module, and a fourth acquisition module. The first acquisition module is used to acquire a preset first reference reactive power value and adjust the output power of the inverter according to the first reference reactive power value; the first detection module is used to detect the first reactive power value of the inductance of a filter; the second acquisition module is used to acquire the second reactive power value of a current transformer; the third acquisition module is used to acquire a first reactive power difference value based on the first and second reactive power values; the first acquisition module is also used to acquire a preset second reference reactive power value and adjust the output power of the inverter according to the second reference reactive power value; the first detection module is also used to detect the third reactive power value of the inductance of the filter; the second acquisition module is also used to acquire the fourth reactive power value of the current transformer; the third acquisition module is also used to acquire a second reactive power difference value based on the third and fourth reactive power values; the third acquisition module is also used to acquire a preset reactive power output limit value; and the fourth acquisition module is used to acquire the operating status of the current transformer according to the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value.

[0031] This application provides a control device for a photovoltaic energy storage device, comprising a first acquisition module, a first detection module, a second acquisition module, a third acquisition module, and a fourth acquisition module. The first acquisition module acquires a preset first reference reactive power value and adjusts the inverter's output power based on this value. The first detection module detects the first reactive power value of the filter's inductance. The second acquisition module acquires the second reactive power value of the current transformer. The third acquisition module acquires a first reactive power difference value based on the first and second reactive power values. The first acquisition module also acquires the second reference reactive power value and adjusts the inverter's output power based on this value. The first detection module also detects the third reactive power value of the filter's inductance. The second acquisition module acquires the fourth reactive power value of the current transformer. The third acquisition module acquires a second reactive power difference value based on the third and fourth reactive power values. The third acquisition module also acquires a preset reactive power output limit value. The fourth acquisition module acquires the operating status of the current transformer based on the first and second reactive power differences. By employing a reactive power control loop, and by separately detecting the reactive power values ​​fed back by the inductor and current transformer under different reference reactive power values, a first reactive power difference and a second reactive power difference are obtained. Then, by comparing the magnitudes of the first and second reactive power differences with the reference reactive power values, the operating status of the current transformer can be detected. Through the comparison of reactive power differences, the fault type of the current transformer can be determined by adjusting different reactive power reference values, thereby reducing the impact on active power and thus avoiding any impact on the power generation and system stability of the photovoltaic-storage integrated machine.

[0032] By introducing a reactive power control loop, large fluctuations in output power can be avoided, thus preventing any impact on the power generation and system stability of the integrated photovoltaic-storage system. The reactive power difference is obtained by subtracting the reactive power values ​​fed back from the current transformer and those at the inductor under different reference reactive power conditions. By determining the magnitude of this reactive power difference from the reference reactive power value, the fault type of the current transformer can be identified, improving the accuracy of current transformer operation status detection.

[0033] A third aspect of this application provides an electronic device including a processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the method as described in any of the above technical solutions.

[0034] The electronic device provided in this application includes a processor and a memory. The memory stores a program or instructions that can run on the processor. When the program or instructions are executed by the processor, they implement the steps of the method as described in any of the above-described technical solutions. Therefore, this electronic device possesses all the beneficial effects of the control method for the optical storage device as described in any of the above-described technical solutions.

[0035] A fourth aspect of this application provides a readable storage medium having a program or instructions stored thereon, which, when executed by a processor, implement the steps of the control method for an optical storage device as described in any of the above technical solutions.

[0036] This application provides a readable storage medium storing a program or instructions, which, when executed by a processor, implement the steps of the control method for an optical storage device as described in any of the above-described technical solutions. Therefore, this readable storage medium possesses all the beneficial effects of the control method for an optical storage device as described in any of the above-described technical solutions.

[0037] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0038] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0039] Figure 1 One of the flowcharts is a control method for a photoelectric storage device according to an embodiment of the present invention;

[0040] Figure 2 This is a structural block diagram of a control device for a photoelectric storage device according to an embodiment of the present invention;

[0041] Figure 3 This is a structural block diagram of an electronic device according to an embodiment of the present invention;

[0042] Figure 4 This is a partial circuit connection diagram of an optical storage device according to an embodiment of the present invention;

[0043] Figure 5 This is a schematic diagram of the control logic of an optical storage device according to an embodiment of the present invention;

[0044] Figure 6 This is a second flowchart of a control method for a photoelectric storage device according to an embodiment of the present invention;

[0045] Figure 7 This is the third flowchart of a control method for a photoelectric storage device according to an embodiment of the present invention. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of the invention. However, the invention may also be practiced in other ways different from those described herein, and therefore the scope of protection of the invention is not limited to the specific embodiments disclosed below.

[0048] The following reference Figures 1 to 7 The invention describes a control method for an optical storage device, a control device for an optical storage device, an electronic device, and a readable storage medium according to some embodiments of the invention.

[0049] like Figure 1 As shown in the embodiment of this application, a control method for a photovoltaic energy storage device is provided. The photovoltaic energy storage device includes an inverter and a current transformer. The current transformer is located on the grid-connected side of the inverter. A filter is installed inside the inverter. The control method for the photovoltaic energy storage device includes:

[0050] Step 102: Obtain the preset first reference reactive power value, and adjust the output power of the inverter according to the first reference reactive power value;

[0051] Step 104: Detect the first reactive power value of the filter's inductance;

[0052] Step 106: Obtain the second reactive power value of the current transformer;

[0053] Step 108: Based on the first reactive power value and the second reactive power value, obtain the first reactive power difference;

[0054] Step 110: Obtain the preset second reference reactive power value, and adjust the output power of the inverter according to the second reference reactive power value;

[0055] Step 112: Detect the third reactive power value of the filter's inductance;

[0056] Step 114: Obtain the fourth reactive power value of the current transformer;

[0057] Step 116: Based on the third and fourth reactive power values, obtain the second reactive power difference;

[0058] Step 118: Obtain the preset reactive power output limit value;

[0059] Step 120: Obtain the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value;

[0060] The second reference reactive power value is the opposite of the first reference reactive power value.

[0061] This application provides a control method for a photovoltaic (PV) energy storage device. The PV energy storage device includes an inverter and a current transformer. The current transformer is located on the grid-connected side of the inverter and can provide real-time feedback of the grid current of the PV energy storage device to the inverter. This ensures stable power transmission and improves the operational stability of the PV energy storage device when it is connected to the grid. The inverter has an internal filter. The control method includes using a reactive power control loop to control the inverter's current loop. Specifically, a preset first reference reactive power value is obtained within the PV energy storage device, which is then introduced into the reactive power control loop. The first reference reactive power value is used to adjust the inverter's output power. The inductor current of the current filter is detected, and a first reactive power value of the inductor is calculated. The current transformer is controlled to detect the current, and a second reactive power value of the current transformer is calculated based on the detected current. A first reactive power difference value is obtained based on the first and second reactive power values. The above steps yield the difference between the reactive power value at the inductor within the inverter and the reactive power value fed back from the current transformer. Then, a reference reactive power value is obtained again, specifically the preset second reference reactive power value within the photovoltaic energy storage device. The inverter's output power is adjusted based on this second reference reactive power value. The third reactive power value of the filter inductor is detected. The fourth reactive power value of the current transformer is obtained. Based on the third and fourth reactive power values, a second reactive power difference is obtained. The operating status of the current transformer is obtained based on the first and second reactive power differences. This can be achieved by referencing the reactive power control loop and dividing... The system detects the reactive power values ​​fed back by inductors and current transformers under different reference reactive power values ​​to obtain a first reactive power difference and a second reactive power difference. Based on these two differences, the system calculates the difference between them and compares it with a preset reactive power output limit. This allows for the monitoring of the current transformer's operating status. By comparing the reactive power differences, the system can determine the fault type of the current transformer by adjusting different reactive power reference values, reducing its impact on active power and thus avoiding negative impacts on the power generation and system stability of the integrated photovoltaic-storage system. The second reference reactive power value is the opposite of the first reference reactive power value.

[0062] By introducing a reactive power control loop, large fluctuations in output power can be avoided, thus preventing any impact on the power generation and system stability of the integrated photovoltaic-storage system. The reactive power difference is obtained by subtracting the reactive power values ​​fed back from the current transformer and those at the inductor under different reference reactive power conditions. By determining the magnitude of this reactive power difference from the reference reactive power value, the fault type of the current transformer can be identified, improving the accuracy of current transformer operation status detection.

[0063] Specifically, the preset reactive power output limit can be 0.6 times the rated power.

[0064] like Figure 4As shown, in the inverter side of the photovoltaic-storage equipment, the inverter internally houses an inverter unit D1 and a filter D2. The filter D2 contains an inductor L and a capacitor C. On the grid-connected side of the inverter, a current transformer CT and a load Load are also installed. The grid port G can be used to collect the current I across the inductor. L As a control measure, a current transformer (CT) is added at the grid connection port to collect the feeder current I. g Used to calculate the active and reactive power of the feeder network.

[0065] like Figure 5 As shown, specifically, a reactive power reference value can be set, and the first reference reactive power value can be obtained by obtaining the reactive power feedback value (first reactive power value) of the current transformer and passing it through a proportional-integral control loop.

[0066] The input reactive power reference value is Q_ref. The second reactive power value fed back by the current transformer is Grid_Q_fdb. The specific proportional-integral (PI) control loop is called Proportional Integral (PI). up_lmt is the upper limit of the reactive power control loop output, i.e., the upper limit of the output reactive power value, used to adjust the inverter to change the output power. low_lmt is the lower limit of the reactive power control loop output. Based on the commonly used power factor of 0.8, the upper limit of the reactive power control loop output can be set to 0.6 times the input reactive power reference value, which can be 0.6 times the rated power. Therefore, the lower limit of the reactive power control loop output can be set to the opposite of 0.6 times the input reactive power reference value. Specifically, the reactive power output limit value can be preset to 0.6 times the rated power. I_Q_Ref is the output of the reactive power control loop, i.e., the output reactive power value, which can be used for current loop control, i.e., to adjust the inverter to change the output power. Furthermore, the range of the reactive power reference value can be from 50var to 200var. Specifically, the reactive power reference value can be 50 var, 100 var, 150 var, 170 var, or 200 var.

[0067] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0068] The operating status of the current transformer is obtained based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, including: obtaining the third reactive power difference value based on the first reactive power difference value and the second reactive power difference value; when the absolute value of the third reactive power difference value is less than the absolute value of the reactive power output limit value, the operating status of the current transformer is determined to be the normal operating status.

[0069] In this embodiment, the step of obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value includes obtaining a third reactive power difference value based on the first and second reactive power difference values. That is, based on the first and second reactive power difference values, i.e., the two reactive power difference values ​​between the current transformer and the inductor, the third reactive power difference value is obtained by subtracting the two reactive power difference values. When the absolute value of the third reactive power difference value is less than the absolute value of the reactive power output limit value, the operating status of the current transformer is in normal operation. During the operation of the photovoltaic energy storage device, the operating status of the current transformer can be dynamically identified by introducing a reactive power reference value and a reactive power output limit value without affecting the active power output of the photovoltaic energy storage device, thereby improving the stability of the device.

[0070] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0071] After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: when the operating status of the current transformer is in normal operation, controlling the current transformer to detect the first feeder current value and feeding back the first feeder current value to the inverter, and jumping to obtain the preset first reference reactive power value.

[0072] In this embodiment, after obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: after comparing the third reactive power difference value with the reactive power output limit value, it is known that the current transformer is in normal operation. Based on the operating status of the current transformer being in normal operation, the current transformer is controlled to detect the first feed current value and feed back the first feed current value to the inverter. This can realize real-time feedback of the feed current value of the photovoltaic energy storage device and continuously obtain the first reactive power reference value. The reactive power values ​​of the current transformer and the inductor are compared multiple times to realize continuous self-testing of the current transformer.

[0073] Furthermore, when the first reference reactive power value is set to 50var, if the current transformer is operating normally, the reactive power value calculated based on the first feeder current value fed back by the current transformer should be 50var. Therefore, the difference between the first reactive power difference and the second reactive power difference should be greater than or equal to 0var and less than 50var. Thus, by comparing the third reactive power difference with the first reference reactive power value, the operating status of the current transformer can be identified, improving the stability of equipment operation.

[0074] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0075] The operating status of the current transformer is obtained based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, including: obtaining the third reactive power difference value based on the first reactive power difference value and the second reactive power difference value; when the absolute value of the third reactive power difference value is greater than the absolute value of the reactive power output limit value, the operating status of the current transformer is determined to be an abnormal operating status.

[0076] In this embodiment, the step of obtaining the operating state of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value includes: obtaining the third reactive power difference value based on the first reactive power difference value and the second reactive power difference value; when the absolute value of the third reactive power difference value is greater than the absolute value of the reactive power output limit value, the operating state of the current transformer is an abnormal operating state. When a current transformer is in a fault state, the reactive power value fed back by the current transformer can be the opposite of the first reference reactive power value or the feedback reactive power value can be 0var. Therefore, by setting different reactive power reference values ​​and obtaining the reactive power difference between the inductor and the current transformer when different reactive power reference values ​​are set, namely the first reactive power difference and the second reactive power difference, the third reactive power difference can be obtained by judging the difference between the first reactive power difference and the second reactive power difference. When the absolute value of the third reactive power difference is greater than the reactive power output limit value, since the current detected at the inductor is the bus current, the absolute value of the third reactive power difference is greater than the preset reactive power reference value, which proves that the third reactive power difference, i.e., the current transformer is abnormal. Therefore, the current transformer is in an abnormal working state at this time.

[0077] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0078] When the absolute value of the third reactive power difference is greater than the absolute value of the first reference reactive power value, the operating state of the current transformer is determined to be an abnormal operating state, including: when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit value but less than three times the absolute value of the reactive power output limit value, the operating state of the current transformer is determined to be an open state.

[0079] In this embodiment, the abnormal operating state of the current transformer is determined based on the fact that the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit. This includes: when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit but less than three times the absolute value of the reactive power output limit, the operating state of the current transformer is in an open state. When the operating state of the current transformer is in an open state, the reactive power value fed back at the current transformer is 0var. Then, the reactive power value detected at the inductor minus the reactive power value fed back at the current transformer is the first reactive power difference at its maximum value. Similarly, since the obtained second reference reactive power value is the opposite of the first reference reactive power value, the obtained second reactive power difference should be the opposite of the first reactive power difference. Therefore, the third reactive power difference should be less than three times the absolute value of the reactive power output limit and less than twice the absolute value of the reactive power output limit. Thus, it can be determined that the reactive power value detected at the current transformer is 0var, that is, the current transformer is in an open state.

[0080] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0081] After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: based on the current transformer operating status being in the off state, detecting the first current value of the inductor, and controlling the current transformer to feed back the first current value to the inverter.

[0082] In this embodiment, after obtaining the operating status of the current transformer, the control method for the photovoltaic energy storage device further includes: based on the current transformer's operating status being open, detecting the first current value of the inductor, and controlling the current transformer to feed back the first current value to the inverter. When the current transformer detects an open problem, the feedback quantity involving the current transformer can be changed to the current at the inductor, and a current transformer disconnection warning can be reported. Without affecting operation, the device awaits inspection by maintenance personnel. This allows for dynamic identification of the current transformer's operating status during photovoltaic energy storage device operation by introducing a reactive power reference value, without affecting the active power output of the photovoltaic energy storage device, thus improving device stability.

[0083] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0084] When the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, the operating state of the current transformer is determined to be an abnormal operating state, including: when the absolute value of the third reactive power difference is greater than three times the absolute value of the reactive power output limit, the current transformer is in a reverse connection state.

[0085] In this embodiment, the abnormal operating state of the current transformer is determined based on the fact that the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit. This includes determining that the current transformer is in a reverse connection state when the absolute value of the third reactive power difference is greater than the absolute value of three times the reactive power output limit. Since the first reference reactive power value is a reference reactive power value obtained based on the control loop, it can be determined that the current transformer is in a reverse connection state when the absolute value of the third reactive power difference is greater than the absolute value of three times the reactive power output limit.

[0086] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0087] After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: controlling the current transformer to detect the second feeder current value and obtain the opposite value of the second feeder current value based on the current transformer being in a reverse connection state; and controlling the current transformer to feed back the opposite value of the second feeder current value to the inverter.

[0088] In this embodiment, after obtaining the operating status of the current transformer based on the first reactive power difference value and the second reactive power difference value, the control method for the photovoltaic-storage equipment further includes: controlling the current transformer to detect the second feeder current value and obtain the opposite value of the second feeder current value if the current transformer is in a reverse connection state; and controlling the current transformer to feed back the opposite value of the second feeder current value to the inverter. When a reverse connection fault is detected in the current transformer, the feeder current value fed back by the current transformer can be retained, and the opposite value of the current value can be obtained. Then, the self-test state can continue, and the self-test can be passed in the second round, thus resolving the fault. At the same time, the photovoltaic-storage equipment reports a reverse connection warning, which can ensure normal operation while waiting for maintenance, thereby improving the stability of equipment operation.

[0089] This embodiment provides a control method for a photovoltaic storage device. In addition to the technical features of the above embodiments, this embodiment further includes the following technical features.

[0090] Before obtaining the first reference reactive power value and adjusting the inverter's output power according to the preset first reference reactive power value, the control method for the photovoltaic-storage equipment further includes: receiving a current transformer control signal; when the current transformer control signal is an open detection signal, switching to obtain the preset first reference reactive power value; when the current transformer control signal is an closed detection signal, controlling the current transformer to obtain the third feeder current value and feeding back the third feeder current value to the inverter.

[0091] In this embodiment, before acquiring a preset first reference reactive power value and adjusting the inverter's output power based on that value, the control method for the photovoltaic-storage device further includes: receiving a current transformer control signal, i.e., controlling whether to detect the current transformer based on an external enable signal. If the current transformer control signal is an enabled detection signal, the method jumps to acquiring the first reference reactive power value, i.e., acquiring the operating status of the current transformer, thus enabling the detection of the current transformer's status. When the current transformer control signal is a disabled detection signal, i.e., the photovoltaic-storage device no longer performs fault detection on the current transformer, it then controls the current transformer to acquire the third feeder current value and feeds it back to the inverter, achieving real-time feedback of the feeder current by the current transformer and shielding the current transformer from fault conditions.

[0092] Specifically, such as Figure 6 As shown, the control method for photovoltaic storage devices also includes:

[0093] Step 402: Is external CT detection enabled?

[0094] If the result of step 402 is yes, then proceed to step 404; otherwise, proceed to step 403.

[0095] Step 403: Set the reactive power reference to 0var and disable the corresponding CT fault;

[0096] Step 404: Set the reactive power reference to 50var;

[0097] Step 405: Does it last for 1 second?

[0098] If the result of step 405 is yes, then proceed to step 406; otherwise, proceed to step 404.

[0099] Step 406: Calculate the difference between the reactive value of the inductor current and the reactive value calculated from the grid-connected current, which is Deta_Q1;

[0100] Step 407: Set reactive power reference - 50var

[0101] Step 408: Does it last for 1 second?

[0102] If the result of step 408 is yes, then proceed to step 409; otherwise, proceed to step 407.

[0103] Step 409: Calculate the difference between the reactive value of the inductor current and the reactive value calculated from the grid-connected current, which is Deta_Q2;

[0104] Step 410: Calculate the difference between the two Deta_Q values, which is Deta_Q1Q2.

[0105] The external enable signal for Current Transformer (CT) detection refers to whether the photovoltaic energy storage device has an external enable signal to control the detection of the current transformer. If the result is yes, the current transformer detection continues, i.e., by setting a reactive power reference of 50var, which is achieved through... Figure 5 The reactive power control loop shown controls the inverter's current loop to determine if the inverter can stably output power and maintain it for more than 1 second. If the inverter can stably output power and maintain it for more than 1 second, it proves that the inverter is stable. The difference between the reactive power value calculated from the inductor current and the reactive power value calculated from the grid-connected current is given as Deta_Q1, which is the first reactive power difference. Then, by setting the reactive power reference to -50var, that is, by... Figure 5 The reactive power control loop shown controls the inverter's current loop again and determines whether the inverter can stably output power and maintain it for more than 1 second. If the inverter can stably output power and maintain it for more than 1 second, it proves that the inverter is stable. The difference between the reactive power value calculated from the inductor current and the reactive power value calculated from the grid current is given as Deta_Q2, which is the second reactive power difference. The difference between the two Deta_Q values ​​is then calculated as Deta_Q1Q2, which is the third reactive power difference.

[0106] Specifically, such as Figure 7 As shown, the control method for photovoltaic storage devices also includes:

[0107] Step 502: Calculate the absolute value of Deta_Q1Q2, Abs_Deta_Q1Q2;

[0108] Step 504: Is Abs_Deta_Q1Q2 greater than lmt_var?

[0109] If the result of step 504 is otherwise, proceed to step 506; if the result of step 504 is yes, proceed to step 510.

[0110] Step 506: CT scan results are normal;

[0111] Step 508: Maintain reactive power disturbance and continuously monitor CT status;

[0112] Step 510: Is Abs_Deta_Q1Q2 greater than 3 times lmt_var?

[0113] If the result of step 510 is otherwise, proceed to step 512; if the result of step 510 is yes, proceed to step 516.

[0114] Step 512: CT wire disconnection fault;

[0115] Step 514: Shut down reactive power disturbance, use inductor current to calculate reactive power feedback, and report CT disconnection fault;

[0116] Step 516: CT reverse connection fault;

[0117] Step 518: Feed back the opposite of the actual CT detection value, continuously monitor the CT, and report CT reverse connection faults.

[0118] Where Deta_Q1Q2 is the third reactive power difference. Abs_Deta_Q1Q2 is the absolute value of the third reactive power difference. lmt_var is the reactive power difference output by the control loop, i.e., the first reference reactive power value.

[0119] like Figure 2 As shown in the embodiments of this application, a control device 200 for an optical storage device is provided, including a first acquisition module 210, a first detection module 220, a second acquisition module 230, a third acquisition module 240, and a fourth acquisition module 250. The first acquisition module 210 is used to acquire a preset first reference reactive power value and adjust the output power of the inverter according to the first reference reactive power value; the first detection module 220 is used to detect the first reactive power value of the filter inductance; the second acquisition module 230 is used to acquire the second reactive power value of the current transformer; the third acquisition module 240 is used to acquire a first reactive power difference value based on the first and second reactive power values; the first acquisition module 210 is also used to acquire a preset second reference reactive power value and adjust the output power of the inverter according to the second reference reactive power value; the first detection module 220 is also used to detect the third reactive power value of the filter inductance; the second acquisition module 230 is also used to acquire a fourth reactive power value of the current transformer; the third acquisition module 240 is also used to acquire a second reactive power difference value based on the third and fourth reactive power values; the third acquisition module 240 is also used to acquire a preset reactive power output limit value; and the fourth acquisition module 250 is used to acquire the operating status of the current transformer according to the first and second reactive power difference values.

[0120] The control device 200 for an optical storage device provided in this application includes a first acquisition module 210, a first detection module 220, a second acquisition module 230, a third acquisition module 240, and a fourth acquisition module 250. The first acquisition module 210 is used to acquire a preset first reference reactive power value in the photovoltaic energy storage device and adjust the output power of the inverter according to the first reference reactive power value; the first detection module 220 is used to detect the first reactive power value of the filter inductance; the second acquisition module 230 is used to acquire the second reactive power value of the current transformer; the third acquisition module 240 is used to acquire a first reactive power difference value based on the first and second reactive power values; the first acquisition module 210 is also used to acquire the second reference reactive power value and adjust the output power of the inverter according to the second reference reactive power value; the first detection module 220 is also used to detect the third reactive power value of the filter inductance; the second acquisition module 230 is also used to acquire the fourth reactive power value of the current transformer; the third acquisition module 240 is also used to acquire the second reactive power difference value based on the third and fourth reactive power values; the third acquisition module 240 is also used to acquire a preset reactive power output limit value; and the fourth acquisition module 250 is used to acquire the operating status of the current transformer according to the first and second reactive power difference values. By employing a reactive power control loop, and by separately detecting the reactive power values ​​fed back by the inductor and current transformer under different reference reactive power values, a first reactive power difference and a second reactive power difference are obtained. Then, by comparing the magnitudes of the first and second reactive power differences with the reference reactive power values, the operating status of the current transformer can be detected. Through the comparison of reactive power differences, the fault type of the current transformer can be determined by adjusting different reactive power reference values, thereby reducing the impact on active power and thus avoiding any impact on the power generation and system stability of the photovoltaic-storage integrated machine.

[0121] By introducing a reactive power control loop, large fluctuations in output power can be avoided, thus preventing any impact on the power generation and system stability of the integrated photovoltaic-storage system. The reactive power difference is obtained by subtracting the reactive power values ​​fed back from the current transformer and those at the inductor under different reference reactive power conditions. By determining the magnitude of this reactive power difference from the reference reactive power value, the fault type of the current transformer can be identified, improving the accuracy of current transformer operation status detection.

[0122] like Figure 3 As shown in the embodiments of this application, an electronic device 300 is provided, including a processor 304 and a memory 302. The memory 302 stores programs or instructions that can run on the processor 304. When the program or instructions are executed by the processor 304, they implement the steps of the control method of the optical storage device as described in any of the above embodiments.

[0123] The electronic device 300 provided in this application includes a processor 304 and a memory 302. The memory 302 stores programs or instructions that can run on the processor 304. When the program or instructions are executed by the processor 304, they implement the steps of the control method for the optical storage device as described in any of the above embodiments. Therefore, this electronic device 300 possesses all the beneficial effects of the control method for the optical storage device as described in any of the above embodiments.

[0124] In the embodiments of this application, a readable storage medium is provided, on which a program or instructions are stored, which, when executed by processor 304, implement the steps of the control method of the optical storage device as described in any of the above embodiments.

[0125] This application provides a readable storage medium storing a program or instructions that, when executed by a processor, implement the steps of the method as described in any of the above embodiments. Therefore, this readable storage medium possesses all the beneficial effects of the control method for the optical storage device as described in any of the above embodiments.

[0126] In the claims, description, and accompanying drawings of this invention, the term "plural" refers to two or more. Unless otherwise explicitly defined, the terms "upper," "lower," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and simplifying the descriptive process, and are not intended to indicate or imply that the device or element referred to must have the described specific orientation, or be constructed and operated in a specific orientation. Therefore, these descriptions should not be construed as limiting the invention. The terms "connected," "installed," "fixed," etc., should be interpreted broadly. For example, "connected" can be a fixed connection between multiple objects, a detachable connection between multiple objects, or an integral connection; it can be a direct connection between multiple objects or an indirect connection between multiple objects through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in this invention can be understood based on the specific circumstances described above.

[0127] In the claims, description, and accompanying drawings of this invention, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In the claims, description, and accompanying drawings of this invention, illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0128] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A control method for a photovoltaic energy storage device, characterized in that, The photovoltaic energy storage device includes an inverter and a current transformer. The current transformer is located on the grid-connected side of the inverter. A filter is installed inside the inverter. The control method of the photovoltaic energy storage device includes: Obtain a preset first reference reactive power value, and adjust the output power of the inverter according to the first reference reactive power value; Detect the first reactive power value of the filter's inductance; Obtain the second reactive power value of the current transformer; Based on the first reactive power value and the second reactive power value, obtain the first reactive power difference; Obtain a preset second reference reactive power value, and adjust the output power of the inverter according to the second reference reactive power value; The third reactive power value of the filter's inductance is detected; Obtain the fourth reactive power value of the current transformer; Based on the third reactive power value and the fourth reactive power value, the second reactive power difference is obtained; Obtain the preset reactive power output limit value; The operating status of the current transformer is obtained based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value. Wherein, the second reference reactive power value is the opposite of the first reference reactive power value.

2. The control method for the photovoltaic storage device according to claim 1, characterized in that, The step of obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value includes: Based on the first reactive power difference and the second reactive power difference, obtain the third reactive power difference; When the absolute value of the third reactive power difference is less than the absolute value of the reactive power output limit, the current transformer is determined to be in normal operating condition.

3. The control method for the photovoltaic storage device according to claim 2, characterized in that, After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: When the current transformer is in normal operating condition, the current transformer is controlled to detect the first feed current value and feed it back to the inverter, and then jump to obtain the preset first reference reactive power value.

4. The control method for the photovoltaic storage device according to claim 1, characterized in that, The step of obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value includes: Based on the first reactive power difference and the second reactive power difference, obtain the third reactive power difference; When the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, the operating state of the current transformer is determined to be an abnormal operating state.

5. The control method for the photovoltaic storage device according to claim 4, characterized in that, The step of determining that the operating state of the current transformer is abnormal when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit value includes: When the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit, but less than three times the absolute value of the reactive power output limit, the current transformer is determined to be in an open state.

6. The control method for the photovoltaic storage device according to claim 5, characterized in that, After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: Based on the fact that the current transformer is in the off state, the first current value of the inductor is detected, and the current transformer is controlled to feed back the first current value to the inverter.

7. The control method for the photovoltaic storage device according to claim 4, characterized in that, The step of determining that the operating state of the current transformer is abnormal when the absolute value of the third reactive power difference is greater than the absolute value of the reactive power output limit value includes: When the absolute value of the third reactive power difference is greater than three times the absolute value of the reactive power output limit, the current transformer is determined to be in reverse connection state.

8. The control method for the photovoltaic storage device according to claim 7, characterized in that, After obtaining the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value, the control method of the photovoltaic energy storage device further includes: Based on the fact that the current transformer is in reverse connection state, the current transformer is controlled to detect the second feed current value and obtain the opposite value of the second feed current value; The current transformer is controlled to feed back the opposite value of the second feed grid current to the inverter.

9. The control method for the photovoltaic storage device according to any one of claims 1 to 8, characterized in that, Before obtaining a preset first reference reactive power value and adjusting the output power of the inverter according to the first reference reactive power value, the control method of the photovoltaic energy storage device further includes: Receive current transformer control signals; When the current transformer control signal is an activation detection signal, the process jumps to obtain a preset first reference reactive power value. When the current transformer control signal is a shutdown detection signal, the current transformer is controlled to obtain the third feeder current value and feed the third feeder current value back to the inverter.

10. A control device for a photovoltaic storage device, characterized in that, The photovoltaic energy storage device includes an inverter and a current transformer. The current transformer is located on the grid-connected side of the inverter. A filter is installed inside the inverter. The control device of the photovoltaic energy storage device includes: The first acquisition module is used to acquire a preset first reference reactive power value and adjust the output power of the inverter according to the first reference reactive power value. The first detection module is used to detect the first reactive power value of the inductance of the filter; The second acquisition module is used to acquire the second reactive power value of the current transformer; The third acquisition module is used to acquire the first reactive power difference based on the first reactive power value and the second reactive power value; The first acquisition module is further configured to acquire a preset second reference reactive power value, and adjust the output power of the inverter according to the second reference reactive power value; The first detection module is also used to detect the third reactive power value of the inductance of the filter; The second acquisition module is also used to acquire the fourth reactive power value of the current transformer; The third acquisition module is further configured to acquire a second reactive power difference based on the third reactive power value and the fourth reactive power value; The third acquisition module is also used to acquire a preset reactive power output limit value; The fourth acquisition module is used to acquire the operating status of the current transformer based on the reactive power output limit value, the first reactive power difference value, and the second reactive power difference value.

11. An electronic device, characterized in that, include: A processor and a memory, the memory storing a program or instructions executable on the processor, the program or instructions, when executed by the processor, implementing the steps of the control method for the optical storage device as described in any one of claims 1 to 9.

12. A readable storage medium having a program or instructions stored thereon, characterized in that, When the program or instructions are executed by the processor, they implement the steps of the control method for the optical storage device as described in any one of claims 1 to 9.

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