Power supply control method, system and device of energy storage inverter and storage medium

Abstract

This application discloses a power supply control method, system, device, and storage medium for an energy storage inverter. The method includes: acquiring a first voltage of a photovoltaic panel and a second voltage of an energy storage battery; obtaining a first voltage difference and a second voltage difference based on the first voltage, the second voltage, and a preset voltage threshold; if the first voltage difference is greater than zero and the second voltage difference is greater than zero, and the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, determining that the photovoltaic panel or the energy storage battery is capacitor-powered. The system includes a first voltage detection device, a second voltage detection device, a microprocessor module, a relay module, and a rectifier module. By using the method in this application, multiple power supply modes of the energy storage inverter can be effectively controlled, which is beneficial to improving the utilization rate of electrical energy and the operational stability of the energy storage inverter. This application can be widely applied in the field of power technology.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electric power, and particularly relates to a power supply control method, system and device of an energy storage inverter and a storage medium. BACKGROUND

[0002] The energy storage inverter needs an uninterrupted power supply system to supply power, and the power supply energy can be derived from a photovoltaic cell panel, an energy storage battery or an alternating current power grid. In the related art, there are two schemes, one is that the power supply energy is derived from the photovoltaic cell panel and the energy storage battery, in which case, the energy storage inverter system has the risk of power failure and shutdown; the other is that the power supply energy is derived from the photovoltaic cell panel, the energy storage battery and the alternating current power grid, in which case, the energy of the alternating current power grid is mostly supplied through a transformer flyback circuit, which cannot be effectively controlled and has the problem of energy waste. SUMMARY

[0003] The present application aims to at least partly solve one of the problems in the prior art.

[0004] To this end, the present application aims to provide an efficient and safe power supply control method, system and device of an energy storage inverter and a storage medium.

[0005] Another object of the present application is to provide a multi-mode power supply system of an energy storage inverter.

[0006] In order to achieve the above technical objects, the technical scheme adopted by the present application comprises:

[0007] On the one hand, the present application provides a power supply control method of an energy storage inverter, a capacitor supplies power to the energy storage inverter, a photovoltaic cell panel, an energy storage battery and an alternating current power grid supply energy to the capacitor, and the control method comprises the following steps: obtaining a first voltage of the photovoltaic cell panel; obtaining a second voltage of the energy storage battery; obtaining a first voltage difference according to the first voltage and a preset voltage threshold; obtaining a second voltage difference according to the second voltage and the preset voltage threshold; if the first voltage difference is greater than zero and the second voltage difference is greater than zero, determining whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold; if the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, determining that the photovoltaic cell panel or the energy storage battery supplies power to the capacitor; and if the first voltage difference is less than or equal to zero and the second voltage difference is less than or equal to zero, determining that the alternating current power grid supplies power to the capacitor. By using the above method, the various power supply modes of the energy storage inverter can be effectively controlled, which is conducive to improving the utilization rate of electric energy and the working stability of the energy storage inverter.

[0008] In addition, the power supply control method of the energy storage inverter according to the above-mentioned embodiments of the present application can further have the following additional technical features.

[0009] Further, the power supply control method of the energy storage inverter according to the embodiments of the present application, if the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, it is determined that the photovoltaic cell panel or the energy storage battery is the capacitor power supply, further comprising the following steps: determining a first waiting time according to the first voltage difference and the second voltage difference; obtaining a first cumulative time; if the first cumulative time is equal to the first waiting time, it is determined that the alternating current power grid is the capacitor power supply.

[0010] Further, in an embodiment of the present application, the first voltage of the photovoltaic cell panel is obtained by: obtaining a second cumulative time; if the second cumulative time is equal to a second preset time, obtaining the first voltage of the photovoltaic cell panel, and recalculating the second cumulative time; wherein the preset voltage difference threshold is the discharge amount of the photovoltaic cell panel and / or the energy storage battery within the second preset time.

[0011] Further, in an embodiment of the present application, the method further comprises: if the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero, determining whether the first voltage difference is greater than the preset voltage difference threshold; if the first voltage difference is greater than the preset voltage difference threshold, it is determined that the photovoltaic cell panel is the capacitor power supply.

[0012] Further, in an embodiment of the present application, before obtaining the first voltage of the photovoltaic cell panel, the method further comprises the following steps: in response to the working instruction of the energy storage inverter, it is determined that the alternating current power grid is the capacitor power supply.

[0013] Further, in an embodiment of the present application, the determination that the photovoltaic cell panel or the energy storage battery is the capacitor power supply comprises: if the first voltage difference is greater than the second voltage difference, it is determined that the photovoltaic cell panel is the capacitor power supply.

[0014] In another aspect, an embodiment of the present application provides a power supply control system of a storage inverter, the control system comprising a capacitor for supplying power to the storage inverter, a photovoltaic cell panel, a storage battery and an alternating current power grid for supplying energy to the capacitor, the control system further comprising: a first voltage detection device for obtaining a first voltage of the photovoltaic cell panel; a second voltage detection device for obtaining a second voltage of the storage battery; a microprocessor module for obtaining a first voltage difference according to the first voltage and a preset voltage threshold, obtaining a second voltage difference according to the second voltage and the preset voltage threshold, determining whether a sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold when the first voltage difference is greater than zero and the second voltage difference is greater than zero, determining that the photovoltaic cell panel or the storage battery supplies power to the capacitor when the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, and determining that the alternating current power grid supplies power to the capacitor when the first voltage difference is less than or equal to zero and the second voltage difference is less than or equal to zero; a relay module for receiving an instruction of the microprocessor module and causing the alternating current power grid to supply power to the capacitor; and a rectifier module for converting alternating current of the alternating current power grid into direct current to supply power to the capacitor.

[0015] Further, in an embodiment of the present application, the control system further comprises a first diode for causing the photovoltaic cell panel to supply power to the capacitor when the first voltage difference is greater than zero, the second voltage difference is less than or equal to zero, and the first voltage difference is greater than the preset voltage difference threshold.

[0016] In another aspect, an embodiment of the present application provides a power supply control device of a storage inverter, comprising:

[0017] at least one processor;

[0018] at least one memory for storing at least one program;

[0019] When the at least one program is executed by the at least one processor, the at least one processor implements any of the above-mentioned power supply control methods of a storage inverter.

[0020] In another aspect, an embodiment of the present application provides a storage medium having a processor-executable program stored therein, the processor-executable program being used to implement any of the above-mentioned power supply control methods of a storage inverter when executed by a processor.

[0021] By using the above-mentioned method, various power supply modes of a storage inverter can be effectively controlled, which is beneficial to improving the utilization rate of electric energy and the working stability of the storage inverter. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following introduces the drawings of the related technical solutions in the embodiments of the present application or the prior art. It should be understood that the drawings in the following introduction are only for facilitating the clear description of some of the embodiments of the technical solutions of the present application, and for those skilled in the art, other drawings can also be obtained without any creative labor on the basis of these drawings.

[0023] Figure 1 The flowchart of an embodiment of the power supply control method of the energy storage inverter provided by the present application is shown in the figure.

[0024] Figure 2 The flowchart of an example of the power supply control method of the energy storage inverter provided by the present application is shown in the figure.

[0025] Figure 3 The flowchart of another example of the power supply control method of the energy storage inverter provided by the present application is shown in the figure.

[0026] Figure 4 The structural diagram of an embodiment of the power supply control system of the energy storage inverter provided by the present application is shown in the figure.

[0027] Figure 5 The structural diagram of another embodiment of the power supply control system of the energy storage inverter provided by the present application is shown in the figure.

[0028] Figure 6 The structural diagram of an embodiment of the power supply control device of the energy storage inverter provided by the present application is shown in the figure. DETAILED DESCRIPTION

[0029] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the drawings, in which the same or similar notations represent the same or similar elements or elements with the same or similar functions throughout. The embodiments described below with reference to the drawings are exemplary and are only used to explain the present application, and cannot be understood as a limitation of the present application. For the step numbers in the following embodiments, they are only set for the convenience of explanation and description, and the order between the steps is not limited in any way, and the execution order of each step in the embodiments can be adaptively adjusted according to the understanding of those skilled in the art.

[0030] The power supply control method and system of the energy storage inverter according to the embodiments of the present application are described in detail below with reference to the drawings. First, the power supply control method of the energy storage inverter according to the embodiments of the present application will be described with reference to the drawings.

[0031] Reference Figure 1The power supply control method of the energy storage inverter provided in the embodiments of the present application can be applied to a terminal, can be applied to a server, and can also be software running in the terminal or the server. The terminal can be a tablet computer, a notebook computer, a desktop computer, and the like, but is not limited thereto. The server can be a physical server, a server cluster composed of multiple physical servers, or a distributed system, and can also be a cloud server providing basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communication, middleware services, domain name services, security services, CDNs, and big data and artificial intelligence platforms. In the embodiments of the present application, the capacitor is powered by the energy storage inverter, the photovoltaic panel, the energy storage battery, and the alternating current power grid provide energy for the capacitor, and the power supply control method mainly includes the following steps:

[0032] S110: Obtain a first voltage of the photovoltaic panel; obtain a second voltage of the energy storage battery;

[0033] In this step, the voltage of the photovoltaic panel is obtained and is denoted as the first voltage, and the voltage of the energy storage battery is obtained and is denoted as the second voltage. The power supply control method of the energy storage inverter in the present application is used to select three energy supply modes of the photovoltaic panel, the energy storage battery, and the alternating current power grid. Specifically, by comparing the voltages or the amounts of electricity of the photovoltaic panel and the energy storage battery, a suitable energy supply mode is selected to improve the utilization rate of electric energy while ensuring continuous power supply of the energy storage inverter. Therefore, the voltages of the photovoltaic panel and the energy storage battery need to be obtained first to facilitate the subsequent control process. In some possible implementation manners, the voltages of the photovoltaic panel and the energy storage battery can be measured by a voltage detection device.

[0034] S120: Obtain a first voltage difference according to the first voltage and a preset voltage threshold value;

[0035] S130: Obtain a second voltage difference according to the second voltage and the preset voltage threshold value;

[0036] In the above steps, the first voltage difference and the second voltage difference are obtained according to the measured first voltage, the second voltage, and the preset voltage threshold value. Specifically, the difference between the first voltage and the preset voltage threshold value is denoted as the first voltage difference, and the difference between the second voltage and the preset voltage threshold value is denoted as the second voltage difference. By comparing the first voltage, the second voltage, and the preset voltage threshold value, it can be determined whether the amounts of electricity of the photovoltaic panel and the energy storage battery can meet the working needs of the energy storage inverter. In some possible implementation manners, the preset voltage threshold value can be a voltage value required to provide energy when the energy storage inverter is working, and exemplarily can be 180 V. In this step, the first voltage-180 is obtained to obtain the first voltage difference, and the second voltage-180 is obtained to obtain the second voltage difference.

[0037] S140: If the first voltage difference is greater than zero and the second voltage difference is greater than zero, determining whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold value;

[0038] S150: If the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold value, determining that the photovoltaic cell panel or the energy storage battery is the power supply of the energy storage inverter.

[0039] In the above steps, the energy supply mode of the energy storage inverter is controlled by analyzing and calculating the first voltage difference and the second voltage difference. If the first voltage difference is greater than zero and the second voltage difference is greater than zero, it is further determined whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold value, to confirm that the energy storage inverter can be powered by the photovoltaic cell panel and the energy storage battery. In some possible embodiments, the preset voltage difference threshold value can be a value greater than zero. By setting the preset voltage threshold value, it can be prevented that the power of the photovoltaic cell panel and the energy storage battery is greater than the power required for the operation of the energy storage inverter, but the excess power is not much, and the power supply can only be maintained for a short period of time. In this case, frequent conversion of the power supply mode may occur, which may even cause power failure. The specific value of the preset voltage difference threshold value can be comprehensively considered by a person skilled in the art according to the actual application scenario, the working frequency of the energy storage inverter, and the actual demand of the user.

[0040] S160: If the first voltage difference is less than or equal to zero and the second voltage difference is less than or equal to zero, determining that the alternating current power grid is the power supply of the energy storage inverter.

[0041] In this step, if the first voltage difference is less than or equal to zero and the second voltage difference is less than or equal to zero, it indicates that the power of the photovoltaic cell panel and the energy storage battery cannot support the operation of the energy storage inverter. Therefore, it is determined that the alternating current power grid is the power supply of the energy storage inverter.

[0042] Optionally, the power supply control method of the energy storage inverter in the embodiments of the present application further includes the following steps after the step of determining that the photovoltaic cell panel or the energy storage battery is the power supply of the energy storage inverter if the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold value.

[0043] According to the first voltage difference and the second voltage difference, a first waiting time length is determined.

[0044] A first cumulative time length is obtained.

[0045] If the first cumulative time length is equal to the first waiting time length, it is determined that the alternating current power grid is the power supply of the energy storage inverter.

[0046] In this step, the preset voltage difference threshold may include a first preset voltage difference threshold, which can be set to a value greater than zero. Specifically, the value of the first preset voltage difference threshold can be set comprehensively based on factors such as user needs and the operating time that the energy storage inverter can tolerate when switching power supply modes. If the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, it indicates that the capacitor can be powered by the photovoltaic panel or the energy storage battery first. In some possible implementations, based on the first voltage difference and the second voltage difference, the duration for which the voltage margin (i.e., the sum of the first voltage difference and the second voltage difference) can power the energy storage inverter can be calculated, i.e., the first waiting time. When the power supply time for the photovoltaic panel or the energy storage battery to power the capacitor reaches the first waiting time, it indicates that the power of the photovoltaic panel and the energy storage battery is insufficient to support the operation of the energy storage inverter. Thereafter, the AC grid is controlled to power the capacitor. That is, the first cumulative time is obtained; if the first cumulative time is equal to the first waiting time, it is determined that the AC grid is powering the capacitor. In some possible implementations, the first preset voltage difference threshold can be set to a value slightly larger than the expected value to mitigate the frequent switching of power supply modes. Simultaneously, the first waiting time can be set to a value slightly smaller than the calculated value to mitigate the risk of power outages in the energy storage inverter. For example, after determining that the AC grid is supplying power to the capacitor, this logic indicates that the voltage or charge of the photovoltaic panels and energy storage batteries is insufficient for the energy storage inverter to function. At this point, the control begins charging the photovoltaic panels and energy storage batteries. This method saves on the number of detections, simplifies the control logic, and improves energy utilization without reducing control accuracy.

[0047] Optionally, in the power supply control method of the energy storage inverter in this application embodiment, obtaining the first voltage of the photovoltaic panel includes:

[0048] Obtain the second cumulative duration;

[0049] If the second cumulative duration is equal to the second preset duration, obtain the first voltage of the photovoltaic panel and recalculate the second cumulative duration.

[0050] Wherein, the preset voltage difference threshold is the discharge amount of the photovoltaic panel and / or the energy storage battery within a second preset time period.

[0051] In this step, the charge levels of the photovoltaic panels and energy storage batteries can be periodically measured and analyzed to determine whether their charge levels are sufficient to power the energy storage inverter. The specific value of the second preset duration is set based on factors such as the operating environment, operating current, and operating frequency of the energy storage inverter. For example, when the energy storage inverter operates at a high frequency, the second preset duration is set to a lower value to improve the stability of the power supply system; when the energy storage inverter operates at a low frequency, the second preset duration is set to a higher value to extend the lifespan of the power supply system. Furthermore, the second preset duration can be set as real-time, a fixed local time segment, or a non-fixed time period. Different time intervals can also be set according to the system's usage frequency or importance in different time periods, meeting system requirements while providing diverse options. This application does not limit the specific value of the second preset duration.

[0052] In some possible implementations, the preset voltage difference threshold includes a second preset voltage difference threshold, which is the discharge amount of the photovoltaic panel and / or the energy storage battery within a second preset time period. Under the logic of periodically detecting the power levels of the photovoltaic panel and the energy storage battery, it is necessary to ensure that the power levels of the photovoltaic panel and the energy storage battery are sufficient to power the energy storage inverter within the detection period; otherwise, it is easy for the detection time to expire, but the power levels of the photovoltaic panel and the energy storage battery are insufficient to power the energy storage inverter. Therefore, a second cumulative time period is obtained; if the second cumulative time period equals the second preset time period, the first voltage of the photovoltaic panel is re-obtained, the second voltage of the energy storage battery is obtained, the second cumulative time period is recalculated, and the subsequent comparison and calculation process of the first and second voltages is performed. Through the above method, the power supply mode of the energy storage inverter can be accurately adjusted, improving the working stability of the energy storage inverter.

[0053] Optionally, the power supply control method for the energy storage inverter in this application embodiment further includes:

[0054] If the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero, determine whether the first voltage difference is greater than the preset voltage difference threshold.

[0055] If the first voltage difference is greater than the preset voltage difference threshold, it is determined that the photovoltaic panel supplies power to the capacitor.

[0056] In this step, if the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero, the magnitude of the first voltage difference is analyzed and judged to determine the power supply method of the capacitor. Specifically, if the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero, it indicates that the voltage of the photovoltaic panel can supply power to the energy storage inverter, while the voltage of the energy storage battery is insufficient to supply power to the energy storage inverter. At this time, the relationship between the first voltage difference and a preset voltage difference threshold is judged. If the first voltage difference is greater than the preset voltage difference threshold, the power of the photovoltaic panel can supply the energy storage inverter for a period of time. Therefore, it is determined that the photovoltaic panel supplies power to the capacitor. Those skilled in the art will understand that if the first voltage difference is less than or equal to zero and the second voltage difference is greater than zero, it is judged whether the second voltage difference is greater than the preset voltage difference threshold; if the second voltage difference is greater than the preset voltage difference threshold, it is determined that the energy storage battery supplies power to the capacitor. Through the above method, when either the photovoltaic panel or the energy storage battery can provide power to the energy storage inverter, the photovoltaic panel and / or the energy storage battery can be selected, alleviating the waste of electrical energy and improving the utilization rate of electrical energy.

[0057] Optionally, the power supply control method for the energy storage inverter in this embodiment of the application further includes the following steps before obtaining the first voltage of the photovoltaic panel:

[0058] In response to the operating command of the energy storage inverter, it is determined that the AC power grid supplies power to the capacitor.

[0059] In this step, when the energy storage inverter is powered on, the AC grid is used to supply power to the capacitor. Then, the aforementioned control logic is used to select the power supply mode for the energy storage inverter, which helps improve energy utilization.

[0060] Optionally, in the power supply control method of the energy storage inverter in this application embodiment, the step of determining that the photovoltaic panel or the energy storage battery supplies power to the capacitor includes:

[0061] If the first voltage difference is greater than the second voltage difference, it is determined that the photovoltaic panel supplies power to the capacitor.

[0062] In this step, the specific power supply method of the energy storage inverter is determined by the relationship between the first voltage difference and the second voltage difference. Specifically, if the first voltage difference is greater than the second voltage difference, the photovoltaic panel is determined to be powered by a capacitor; if the first voltage difference is less than the second voltage difference, the energy storage battery is determined to be powered by a capacitor. In some possible implementations, the above control logic can be completed by adding diodes.

[0063] To better describe the power supply control method of the energy storage inverter proposed in this application, two specific examples are described below.

[0064] Example 1: SeeFigure 2 The system detects the first voltage of the photovoltaic panel and the second voltage of the energy storage battery; based on preset voltage thresholds, it calculates the corresponding first voltage difference and second voltage difference. It then determines the magnitude of the first voltage difference and the second voltage difference, corresponding to the following three scenarios:

[0065] Scenario 201: If both the first voltage difference and the second voltage difference are greater than zero. In this case, determine whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold. The preset voltage difference threshold in this example can be a value greater than zero, which can be obtained based on the power consumption of the energy storage inverter under the minimum acceptable power supply switching time of the system. In some possible implementations, if the sum of the first voltage difference and the second voltage difference is greater than the preset voltage difference threshold, control the photovoltaic panel or energy storage battery to supply power to the capacitor. Calculate the first waiting time t211 using voltage margin, and obtain the first cumulative time t212. When the first cumulative time t212 equals the first waiting time t211, control the AC grid to supply power to the capacitor. In some possible implementations, if the sum of the first voltage difference and the second voltage difference is less than or equal to the preset voltage difference threshold, directly control the AC grid to supply power to the capacitor.

[0066] Scenario 202: If the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero. In this case, determine whether the first voltage difference is greater than a preset voltage difference threshold. If the first voltage difference is greater than the preset voltage difference threshold, control the photovoltaic panel to supply power to the capacitor. Calculate the first waiting time t221 using the voltage margin, and obtain the first cumulative time t222. When the first cumulative time t222 equals the first waiting time t221, control the AC power grid to supply power to the capacitor.

[0067] Scenario 203: If the first voltage difference is less than or equal to zero and the second voltage difference is greater than zero. In this case, it is determined whether the second voltage difference is greater than a preset voltage difference threshold. If the second voltage difference is greater than the preset voltage difference threshold, the energy storage battery is controlled to supply power to the capacitor. The first waiting time t231 is calculated using the voltage margin, and the first cumulative time t232 is obtained. When the first cumulative time t232 is equal to the first waiting time t231, the AC power grid is controlled to supply power to the capacitor.

[0068] Example 2: with Figure 3As shown, the control process is as follows: A second accumulated duration is acquired. As the second accumulated duration increases, when it equals a second preset duration, the second accumulated duration is recalculated. The following control logic is executed, and as the second accumulated duration increases, it continues to determine whether the second accumulated duration equals the second preset duration. Therefore, the following control logic is a periodic judgment process. Specifically, the control logic is as follows: The voltages of the photovoltaic panel and the energy storage battery are detected, and the corresponding first voltage difference and second voltage difference are calculated based on preset voltage thresholds. The relationship between the first voltage difference and the second voltage difference can also be divided into three cases as in Example 1. One case will be used as an example. If the first voltage difference is greater than zero and the second voltage difference is greater than zero, it is determined whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold. The preset voltage difference threshold is the discharge amount of the photovoltaic panel and / or the energy storage battery within the second preset duration. If the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold, the photovoltaic panel or energy storage battery is controlled to supply power to the capacitor; if the sum of the first voltage difference and the second voltage difference is less than or equal to the preset voltage difference threshold, the AC power grid is controlled to supply power to the capacitor.

[0069] As can be seen from the above description, the power supply control method for energy storage inverters proposed in this application can effectively control various power supply modes of energy storage inverters, which is conducive to improving the utilization rate of electrical energy and enhancing the working stability of energy storage inverters.

[0070] Secondly, a power supply control system for an energy storage inverter according to an embodiment of this application is described with reference to the accompanying drawings.

[0071] Figure 4 This is a schematic diagram of the power supply control system structure of an energy storage inverter according to an embodiment of this application. The control system includes a capacitor, which supplies power to the energy storage inverter. Photovoltaic panels, energy storage batteries, and the AC grid provide energy to the capacitor. The system specifically includes:

[0072] The first voltage detection device 410 is used to obtain the first voltage of the photovoltaic panel;

[0073] The second voltage detection device 420 is used to obtain the second voltage of the energy storage battery;

[0074] The microprocessor module 430 is configured to: obtain a first voltage difference based on the first voltage and a preset voltage threshold; obtain a second voltage difference based on the second voltage and the preset voltage threshold; determine whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold when both the first voltage difference and the second voltage difference are greater than zero; determine that the photovoltaic panel or the energy storage battery supplies power to the capacitor when both the first voltage difference and the second voltage difference are greater than the preset voltage difference threshold; and determine that the AC power grid supplies power to the capacitor when both the first voltage difference and the second voltage difference are less than or equal to zero.

[0075] The relay module 440 is used to receive instructions from the microprocessor module to enable the AC power grid to supply power to the capacitor.

[0076] The rectifier module 450 is used to convert the AC power from the AC grid into DC power to supply power to the capacitor.

[0077] Optionally, the power supply control system of the energy storage inverter in this embodiment further includes: a first diode, used to enable the photovoltaic panel to supply power to the capacitor when the first voltage difference is greater than zero, the second voltage difference is less than or equal to zero, and the first voltage difference is greater than the preset voltage difference threshold. Similarly, those skilled in the art will understand that the control system further includes: a second diode, used to enable the energy storage battery to supply power to the capacitor when the first voltage difference is less than or equal to zero, the second voltage difference is greater than zero, and the second voltage difference is greater than the preset voltage difference threshold. The first diode and the second diode can be used together to select one of the photovoltaic panel and the energy storage battery to supply power to the capacitor when both the first voltage difference and the second voltage difference are greater than zero.

[0078] Reference Figure 5 The diagram shows another embodiment of the power supply control system for the energy storage inverter. The power supply system draws energy from photovoltaic panels, energy storage batteries, and the AC grid. The photovoltaic panels supply energy to capacitor 530 via a first diode 510; this capacitor is the energy storage capacitor that supplies power to the energy storage inverter. The energy storage battery also supplies energy to the capacitor via a second diode 520. The AC grid, after passing through a rectifier module, supplies energy to the capacitor. The relay module includes a relay drive circuit and a relay switch.

[0079] The above control method is used in this control system, and the process is as follows: When the energy storage inverter is powered on, the relay switch is in the closed state. The AC power grid will be rectified into DC power by the rectifier module and then used to charge the capacitor. When the photovoltaic panel and the energy storage battery are connected, the microprocessor module detects the voltage of the photovoltaic panel and the energy storage battery through the first voltage detection device and the second voltage detection device. According to the above control logic, if it is necessary to control the photovoltaic panel or the energy storage battery to supply power to the capacitor, the microprocessor module will send a high-level control signal to open the relay switch through the relay drive circuit. At this time, the AC power grid no longer provides energy to the energy storage inverter. When the energy of the photovoltaic panel and the energy storage battery is no longer sufficient to supply the energy storage inverter, the microprocessor module will detect a voltage value lower than the energy supply value through the first voltage detection device and the second voltage detection device. At this time, the microprocessor module will send a low-level control signal to close the relay switch through the relay drive circuit. At this time, the AC power grid will first be rectified into DC power by the rectifier module and then used to charge the capacitor to meet the power supply requirements of the energy storage inverter.

[0080] In some possible implementations, when the energy storage inverter is operating, the photovoltaic panel charges the capacitor through a first diode. The capacitor then provides energy to the energy storage inverter. If the energy storage battery is also connected at this time, and if the voltage of the photovoltaic panel is higher than the voltage of the energy storage battery, the second diode is reverse-biased, and the energy storage battery cannot provide energy to the capacitor; in this case, all the energy is provided by the photovoltaic panel. If the voltage of the photovoltaic panel is lower than the voltage of the energy storage battery, the first diode is reverse-biased, and the photovoltaic panel cannot provide energy to the capacitor; in this case, all the energy is provided by the energy storage battery.

[0081] In some possible implementations, the microprocessor module controls the state of the relay switch via a relay drive circuit. When the microprocessor module sends a high-level control signal, this high level opens the relay switch through the relay drive circuit; when the microprocessor module sends a low-level control signal, this low level closes the relay switch through the relay drive circuit. The power supply mode of the energy storage inverter is controlled by the opening and closing of the relay switch.

[0082] In some possible implementations, the first voltage detection device and the second voltage detection device are composed of several resistors and operational amplifiers. This circuit can sample the voltage of the photovoltaic panel and the energy storage battery in real time, and send the sampled voltage value to the microprocessor module for processing.

[0083] In some possible implementations, the microprocessor module, i.e., the digital signal processor, mainly samples the voltage of the photovoltaic panel and the energy storage battery, and after determining the voltage of the two, issues high and low level control signals to control the opening and closing of the relay switch.

[0084] In some possible implementations, the relay drive circuit consists of a resistor and a transistor. The transistor receives high and low levels from the digital signal processor to turn on and off, thereby controlling the opening and closing of the relay switch.

[0085] In some possible implementations, a photovoltaic panel consists of several photovoltaic cells connected in series. The voltage level is determined by the number of cells connected in series; the higher the number of cells connected in series, the higher the voltage value of the photovoltaic panel.

[0086] In some possible implementations, the energy storage battery is composed of several energy storage batteries connected in series. The voltage level is determined by the number of batteries connected in series; the more batteries connected in series, the higher the voltage value of the energy storage battery.

[0087] It is evident that the content of the above method embodiments is applicable to this system embodiment. The specific functions implemented in this system embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0088] Reference Figure 6 This application provides a power supply control device for an energy storage inverter, comprising:

[0089] At least one processor 610;

[0090] At least one memory 620 is used to store at least one program;

[0091] When the at least one program is executed by the at least one processor 610, the at least one processor 610 implements the power supply control method for the energy storage inverter.

[0092] Similarly, the content of the above method embodiments is applicable to this device embodiment. The specific functions implemented by this device embodiment are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0093] This application embodiment also provides a computer-readable storage medium storing a program executable by a processor 610, which, when executed by the processor 610, is used to perform the above-described control method for the fresh air system.

[0094] Similarly, the content of the above method embodiments is applicable to this storage medium embodiment. The specific functions implemented in this storage medium embodiment are the same as those in the above method embodiments, and the beneficial effects achieved are also the same as those achieved in the above method embodiments.

[0095] In some alternative embodiments, the functions / operations mentioned in the block diagrams may not occur in the order shown in the operation diagrams. For example, depending on the functions / operations involved, two consecutively shown blocks may actually be executed substantially simultaneously, or the blocks may sometimes be executed in reverse order. Furthermore, the embodiments presented and described in the flowcharts of this application are provided by way of example to provide a more comprehensive understanding of the technology. The disclosed methods are not limited to the operations and logic flows presented herein. Alternative embodiments are contemplated in which the order of various operations is changed and sub-operations described as part of a larger operation are executed independently.

[0096] Furthermore, although this application is described in the context of functional modules, it should be understood that, unless otherwise stated to the contrary, one or more of the functions and / or features may be integrated into a single physical device and / or software module, or one or more functions and / or features may be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding this application. Rather, given the properties, functions, and internal relationships of the various functional modules in the apparatus disclosed herein, the actual implementation of the module will be understood within the scope of conventional technology for an engineer. Therefore, those skilled in the art can implement the application set forth in the claims using ordinary techniques without excessive experimentation. It is also understood that the specific concepts disclosed are merely illustrative and not intended to limit the scope of this application, which is determined by the full scope of the appended claims and their equivalents.

[0097] If the aforementioned functions are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or a portion of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several programs to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0098] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequential list of executable programs for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, a program execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can retrieve and execute a program from or in conjunction with such a program execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can mean any means that can contain, store, communicate, propagate, or transmit a program for use by or in conjunction with a program execution system, apparatus, or device.

[0099] More specific examples of computer-readable media (a non-exhaustive list) include: electrical connections (electronic devices) having one or more wires, portable computer disk drives (magnetic devices), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Furthermore, computer-readable media can even be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in computer memory.

[0100] It should be understood that various parts of this application can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable program execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0101] In the foregoing description of this specification, the references to terms such as "one embodiment," "another embodiment," or "some embodiments," etc., indicate that a specific feature, structure, material, or characteristic described in connection with an embodiment or example is included in at least one embodiment or example of this application. In this specification, the 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.

[0102] Although embodiments of this application have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the claims and their equivalents.

[0103] The above is a detailed description of the preferred embodiments of this application, but this application is not limited to the embodiments described. Those skilled in the art can make various equivalent modifications or substitutions without departing from the spirit of this application, and these equivalent modifications or substitutions are all included within the scope defined by the claims of this application.

Claims

1. A power supply control method for an energy storage inverter, characterized in that, The capacitor supplies power to the energy storage inverter, and the photovoltaic panels, energy storage battery, and AC grid provide energy to the capacitor. The control method includes the following steps: Obtain the first voltage of the photovoltaic panel; obtain the second voltage of the energy storage battery; The first voltage difference is obtained based on the first voltage and the preset voltage threshold. The second voltage difference is obtained based on the second voltage and the preset voltage threshold. If the first voltage difference is greater than zero and the second voltage difference is greater than zero, determine whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold. If the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold, it is determined that the photovoltaic panel or the energy storage battery supplies power to the capacitor; If the first voltage difference is less than or equal to zero and the second voltage difference is less than or equal to zero, it is determined that the AC power grid supplies power to the capacitor.

2. The power supply control method for the energy storage inverter according to claim 1, characterized in that, If the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold, and it is determined that the photovoltaic panel or the energy storage battery supplies power to the capacitor, the method further includes the following steps: The first waiting time is determined based on the first voltage difference and the second voltage difference; Get the first cumulative duration; If the first cumulative duration is equal to the first waiting duration, it is determined that the AC power grid supplies power to the capacitor.

3. The power supply control method for the energy storage inverter according to claim 1, characterized in that, The step of obtaining the first voltage of the photovoltaic panel includes: Obtain the second cumulative duration; If the second cumulative duration is equal to the second preset duration, obtain the first voltage of the photovoltaic panel and recalculate the second cumulative duration. Wherein, the preset voltage difference threshold is the discharge amount of the photovoltaic panel and / or the energy storage battery within a second preset time period.

4. The power supply control method for the energy storage inverter according to claim 1, characterized in that, The method further includes: If the first voltage difference is greater than zero and the second voltage difference is less than or equal to zero, determine whether the first voltage difference is greater than the preset voltage difference threshold. If the first voltage difference is greater than the preset voltage difference threshold, it is determined that the photovoltaic panel supplies power to the capacitor.

5. The power supply control method for the energy storage inverter according to claim 1, characterized in that, Before obtaining the first voltage of the photovoltaic panel, the following steps are also included: In response to the operating command of the energy storage inverter, it is determined that the AC power grid supplies power to the capacitor.

6. The power supply control method for the energy storage inverter according to claim 1, characterized in that, The step of determining whether the photovoltaic panel or the energy storage battery supplies power to the capacitor includes: If the first voltage difference is greater than the second voltage difference, it is determined that the photovoltaic panel supplies power to the capacitor.

7. A system employing a power supply control method for an energy storage inverter as described in any one of claims 1-6, characterized in that, The control system includes a capacitor that supplies power to the energy storage inverter. Photovoltaic panels, energy storage batteries, and the AC grid provide energy to the capacitor. The control system also includes: A first voltage detection device is used to obtain the first voltage of the photovoltaic panel; A second voltage detection device is used to obtain the second voltage of the energy storage battery; The microprocessor module is configured to: obtain a first voltage difference based on the first voltage and a preset voltage threshold; obtain a second voltage difference based on the second voltage and the preset voltage threshold; determine whether the sum of the first voltage difference and the second voltage difference is greater than a preset voltage difference threshold when both the first voltage difference and the second voltage difference are greater than zero; determine that the photovoltaic panel or the energy storage battery supplies power to the capacitor when both the first voltage difference and the second voltage difference are greater than the preset voltage difference threshold; and determine that the AC power grid supplies power to the capacitor when both the first voltage difference and the second voltage difference are less than or equal to zero. A relay module is used to receive instructions from the microprocessor module to enable the AC power grid to supply power to the capacitor; A rectifier module is used to convert the AC power from the AC grid into DC power to supply power to the capacitor.

8. The power supply control system for the energy storage inverter according to claim 7, characterized in that, The control system further includes: A first diode is configured to enable the photovoltaic panel to supply power to the capacitor when the first voltage difference is greater than zero, the second voltage difference is less than or equal to zero, and the first voltage difference is greater than the preset voltage difference threshold.

9. A power supply control device for an energy storage inverter, characterized in that, include: At least one processor; At least one memory for storing at least one program; When the at least one program is executed by the at least one processor, the at least one processor implements the power supply control method for the energy storage inverter as described in any one of claims 1-6.

10. A computer-readable storage medium storing a processor-executable program, characterized in that: The processor-executable program, when executed by the processor, is used to implement the power supply control method for the energy storage inverter as described in any one of claims 1-6.

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