Solar power generation system

Abstract

To solve the problem that connection reliability with a photovoltaic power generation panel is poor since specifications of the photovoltaic power generation panel are unclear to a micro inverter for a photovoltaic system interconnection.SOLUTION: There is provided an operation method of a photovoltaic power generation system, wherein a load device and a switching element connected in series with each other are connected with an output end of a photovoltaic power generation panel, the operation method first determines ratio of an output power parameter to an output electric parameter of the photovoltaic power generation panel, next, combines the ratio of the output power parameter to the output electric parameter to adjust a connection state between the photovoltaic power generation panel and a micro inverter, and determines whether to connect the micro inverter with the photovoltaic power generation panel when a power feeding instruction is received and power is turned on and supplied to an electrical apparatus.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] Cross-reference of related applications This application claims priority to Chinese Patent Application No. 202410166883.7, filed on 5 February 2024, which is incorporated in its entirety by reference.

[0002] This application relates to the technical field of solar power generation, and particularly to a solar power generation system and Solar power generation system its operation method.

Background Art

[0003] With the development of new energy technologies and the proposal of energy conservation and emission reduction, solar power generation has been widely applied due to its advantages such as being clean, pollution-free, having a short construction period, a long service life, and low maintenance costs. In solar power generation technology, a solar power generation panel is usually connected to an AC power grid through a micro-inverter for solar power system connection to supply electrical energy to the AC power grid.

[0004] However, in related technologies, since the specifications of the solar power generation panel for the micro-inverter for solar power system connection are not clear, the connection reliability with the solar power generation panel is poor.

Summary of the Invention

Problems to be Solved by the Invention

[0005] This application To solve the problem of poor connection reliability with the solar power generation panel, a solar power generation system and Solar power generation system its operation method are explanation to be ru.

Means for Solving the Problems

[0006] In the operation method of a solar power generation system, Depending on the controller, a solar power generation panel Related to a step of determining output power parameters and an output electrical parameter ratio The photovoltaic panels are connected to a load and a microinverter, and the load is connected to a switching element, stepThe method includes the step of adjusting the connection state between the photovoltaic panel and the microinverter based on the output power parameter and the output electrical parameter ratio.

[0007] Solar power generation systems are Cargo and A microinverter connected to electrical equipment, The load and the microinverter are connected to the aforementioned load. Solar power generation panels and The aforementioned load Switching element and Connected to the aforementioned switching element controller A controller configured to determine the output power parameters and output electrical parameter ratios related to the solar power generation panel, and to adjust the connection state between the solar power generation panel and the microinverter based on the output power parameters and output electrical parameter ratios. This includes, [Effects of the Invention]

[0008] The above solar power generation system Mu According to this, a series-connected load device and switching element are connected to the output terminal of the solar power generation panel. But often When a power supply command is received and the system is turned on to supply power to electrical equipment, first the output power parameters and output electrical parameter ratio of the solar power generation panel are determined, and then the output power parameters and output electrical parameter ratio Based Adjust the connection status between the solar power generation panel and the microinverter. (For example, a solar power generation system may be The decision of whether or not to connect the microinverter to the solar panels is made by combining the output power parameters and the output electrical parameter ratio. (You may do so.) . Solar power generation systems are By analyzing the output of the solar panels, it is possible to determine whether or not to control the operation of the solar panels by connecting a microinverter to them, based on the actual output status of the solar panels. In this way, accurate connection control between the microinverter and the solar panels can be achieved without knowing the specifications of the solar panels or whether it is daytime or nighttime, thereby effectively improving the reliability of the connection with the solar panels.

[0009] Book Request or skill To explain the technical solutions more clearly, the following: example A brief description of the drawings that need to be used in the explanation is provided below, and obviously the drawings in the following explanation are some of the drawings of this application. example It is only, and for those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Brief Description of the Drawings

[0010] [Figure 1] It is a schematic configuration diagram of a solar power generation system in an example of the present application. [Figure 2] It is a flowchart showing the steps of an operation method of a solar power generation system in an example of the present application. [Figure 3] It is a flowchart showing the step of analyzing output power parameters and output electrical parameter ratios in an example of the present application. [Figure 4] It is a flowchart showing the step of analyzing the first power parameter, the second power parameter and the output electrical parameter ratio in an example of the present application. [Figure 5] It is a flowchart showing the steps of an operation method of a solar power generation system in another example of the present application. [Figure 6] It is a flowchart showing the step of determining a threshold value in an example of the present application. [Figure 7] It is a flowchart showing the step of analyzing output power parameters and output electrical parameter ratios in another example of the present application. [Figure 8] It is a schematic configuration diagram of a solar power generation system in another example of the present application.

Modes for Carrying Out the Invention

[0011] To facilitate the understanding of the present application, the present application will be described more comprehensively below with reference to the related drawings. Book The application is not limited to what is described in this specification and may be implemented in many different forms. example To make the understanding of the disclosure content of the application more complete and comprehensive, these are provided. Book To make the understanding of the disclosure content of the application more complete and comprehensive, these are provided. example are provided.

[0012] In this application exampleThe operating method of the photovoltaic power generation system is applicable to the photovoltaic power generation system, and specifically, can be found in Figure 1. The photovoltaic power generation system includes a photovoltaic power generation panel 101 and a microinverter 102. The microinverter 102 may also be a plug-and-play device that converts direct current (DC) generated by a single solar module to alternating current (AC). The solar power generation panel 101 has its output terminal connected to a microinverter 102, and the microinverter 102 is an electrical equipment (For example, one or more household appliances) Connected to, the solar power generation panel 101 generates by the photoelectric effect dc power After being converted by the microinverter 102, AC Electrical equipment in the form of power In a bowl It will be supplied. Furthermore, example Furthermore, a voltage collector 103 is provided at the output terminal of the solar power generation panel 101, and a load device (For example, load) R1 and the switching element Q1 are connected in order. In some examples, the microinverter 102 may act as a voltage collector, dynamically adjusting its operation to obtain the panel's maximum power point (MPP) using MPPT (Maximum Power Point Tracking) technology. In other examples, the voltage collector may be a charge controller, a voltage regulator, or an electronic load or sensor. When the switching element Q1 is turned off, the load device R1 is not connected to the solar power generation panel 101. In this case, the solar power generation panel 101 is not voltage-divided by the load device R1. When the switching element Q1 is turned on, the solar power generation panel 101 is voltage-divided by the load device R1, and a constant change occurs in the voltage value at the output terminal of the solar power generation panel 101.

[0013] The controller of the solar power generation system is connected to the switching element Q1 and the voltage collector 103, respectively. The controller can not only control the on / off state of the switching element Q1, but also, when the switching element Q1 is turned on or off, it acquires the output of the solar power generation panel 101 via the voltage collector 103. This will be explained here. This enables the implementation of a solar power generation system's operating method.

[0014] In the method for operating a photovoltaic power generation system according to the present invention, the photovoltaic power generation system includes a photovoltaic panel, a switching element, a load device, and a microinverter, wherein the output terminal of the photovoltaic panel is connected to the first terminal of the load device, the second terminal of the load device is connected to the first terminal of the switching element, and the second terminal of the switching element is grounded. As shown in Figure 2, the method includes steps 202 and 204.

[0015] In step 202, upon receiving a power supply command, the output power parameters and output electrical parameter ratios of the solar panels are determined. (For example, to measure) .

[0016] Specifically, a switching element is an element that can perform a switching function under the action of a controller or manual operation by a user. Includes Solar power generation panels are photoelectric conversion devices that can convert solar energy or light energy into electrical energy. including A load device is an element that can consume electrical energy as a load. including .

[0017] The output power parameter refers to the parameter related to the output power of a solar power generation panel. Includes Specifically, this may be the output power value, or the change in output power under different output conditions of the solar power generation panel, and is not specifically limited. The output electrical parameter ratio is collected from the output terminal of the solar power generation panel when the solar power generation panel is in different output conditions. (e.g., measured) Ratio of electrical parameters including Specifically, the different output states of a solar power generation panel are not unique, but may be two different states: one with a load device connected to the solar power generation panel and one without a load device connected. The ratio of the output electrical parameters may also be a ratio of the output voltages.

[0018] To make it clear, there is no single, specific type of load device and switching element; they should be selected specifically according to the actual needs. For example ,negativeThe load device may be a resistor, specifically a single resistor, or a resistor assembly consisting of multiple resistors connected in series and / or parallel. example The load device may be an energy-consuming element such as an indicator light. The switching element may be a power switch transistor (for example, a transistor or field-effect transistor), or a relay, etc.

[0019] Solar power panels have their output terminals connected to a microinverter. join It is then connected to electrical equipment via a microinverter to supply power. It is configured to A series-connected switching element and load device are provided at the output terminal of the solar power generation panel. In this way, by controlling the on and off states of the switching element during the operation of the solar power generation panel, the solar power generation panel can be in different output states.

[0020] This will be explained here. In terms of operation, by substantially detecting the output of the solar panels, the system can provide appropriate electrical energy to electrical equipment after the solar panels are connected to the microinverter, thereby maintaining the stable operation of the electrical equipment. Therefore, the controller needs to monitor the operation requests of the solar power system and, when it detects that a power supply command has been received... (for example, When solar panels need to charge or supply power to electrical equipment ) The system determines that it needs to detect the output of the solar power generation system, and in this case, it turns on to acquire the output power parameters and the output electrical parameter ratio.

[0021] In step 204, the connection status between the solar panels and the microinverter is adjusted based on the output power parameters and the output electrical parameter ratio.

[0022] ThickThe connection state between the solar power generation panel and the microinverter is defined as the state in which the connection between the microinverter and the solar power generation panel is electrically connected, and the state in which the connection between the microinverter and the solar power generation panel is disconnected. at least Two different states including The controller determines the output power parameters and the output electrical parameter ratio, and then, using these parameters as the basis for its decision, determines whether the microinverter can be connected to the solar power panel based on the actual magnitude of the output power parameters and the output electrical parameter ratio. It is configured to .

[0023] According to the above solar power generation system operation method, a load device and a switching element connected in series are connected to the output terminal of the solar power generation panel, and when it receives a power supply command and turns on to supply power to electrical equipment... , Thick The output power parameters and output electrical parameter ratios of the solar power generation panel are determined, and then the connection state between the solar power generation panel and the microinverter is adjusted by combining the output power parameters and output electrical parameter ratios. But often , For example, the controller is The decision of whether or not to connect the microinverter to the solar panels is made by combining the output power parameters and the output electrical parameter ratio. It can be configured in this way . The controller By analyzing the output of the solar panels, it is determined whether or not to control the solar panels to operate with a microinverter connected, based on the actual output status of the solar panels. It can be configured in this way In this way, even without knowing the specifications of the solar panels, or whether it is daytime or nighttime when the solar panels are operating, precise connection control between the microinverter and the solar panels can be achieved, effectively improving the reliability of the connection with the solar panels.

[0024] As shown in Figure 3, example The steps for determining the output power parameters and output electrical parameter ratios of the above-mentioned solar power generation panel include steps 302, 304, and 306. That's fine. .

[0025] In step 302, if the switching element is turned off... (For example, when it is turned off) The first output voltage of the solar panels in the solar power generation system is obtained.

[0026] In step 304, when the switching element is turned on... (For example, when it is turned on) Then, obtain the second output voltage of the solar power generation panel.

[0027] In step 306, the output power parameters and output electrical parameter ratios are determined based on the first output voltage, the second output voltage, and the resistance value of the load device.

[0028] Specifically, the resistance value of the load device is the equivalent resistance value of the load device. Includes Specifically, it varies depending on the load device, and the resistance value may be stored in the controller as a preset value. . Thick Solar power panels have their output terminals connected to a microinverter. But often The solar power generation panel is connected to electrical equipment via a microinverter to supply power, and a series-connected switching element and load device are provided at the output terminal of the solar power generation panel. By controlling the switching element to turn off during the operation of the solar power generation panel, the first output voltage of the solar power generation panel can be collected at the output terminal of the solar power generation panel.

[0029] Furthermore, there is no single method for turning off a switching element; the corresponding operation differs depending on the type of switching element. example For example, if the switching element is a power switch transistor or relay, the switching element is further connected to a controller, and the controller controls the switching element to turn on or off when it detects a request to detect the output of the solar power generation panel. exampleTherefore, the switching element may be a manual switch, and if a user detects a need to detect the output of the solar power generation panel, they can manually control the switching element on or off; however, it is not specifically limited to this.

[0030] The method for obtaining the first output voltage is: Here Not the only one, but one example In this system, a voltage collector is provided at the output terminal of the solar power generation panel. This voltage collector is connected to a controller by wired or wireless communication, and collects data when the switching element is turned off, obtaining a first output voltage and transmitting it to the controller. Can be configured Another example Alternatively, the voltage collection function may be integrated into the controller, and the controller may be directly connected to the output terminal of the solar power generation panel to perform voltage collection operations at the output terminal of the solar power generation panel.

[0031] As described above, a switching element and a load device are provided at the output terminal of the solar power generation panel. The user may manually turn off the switching element, or the controller may control the switching element to turn off. After collecting the first output voltage, the user may manually or the controller may automatically turn on the switching element. When the switching element is turned on, the second output voltage of the solar power generation panel may be collected and obtained by the voltage collector, or the second output voltage may be collected and obtained directly by the controller.

[0032] The controller obtains the first and second output voltages, then retrieves the resistance value of the load device, and by combining these three values ​​and performing analysis calculations, it can obtain the output power parameters and the output electrical parameter ratio.

[0033] vinegar By obtaining the first and second output voltages of the solar power generation panel based on the on / off state of the switching element, First output voltage, second output voltage and Resistance value of the load device Based It calculates output power parameters and output electrical parameter ratios, and has high calculation accuracy.

[0034] As shown in Figure 4, example Step 306 includes steps 402, 404 and 406. That's fine. .

[0035] In step 402, the first power parameter is determined based on the second output voltage and the resistance value of the load device.

[0036] In step 404, the second power parameter is determined based on the first output voltage, the second output voltage, and the resistance value.

[0037] In step 406, the output electrical parameter ratio is calculated based on the second output voltage and the first output voltage. (For example, the ratio of the second output voltage to the first output voltage) To decide.

[0038] Specifically, the controller collects and acquires a first output voltage when the switching element is turned off, and a second output voltage when the switching element is turned on. Then, by analyzing the first and second output voltages, it determines the first power parameter, the second power parameter, and the output electrical parameter ratio necessary for detecting the output of the solar power generation panel. You may .

[0039] Output power parameters are parameters used to characterize the output power of a solar power generation panel, obtained by analyzing a combination of the first output voltage and / or the second output voltage. Includes The output electrical parameter ratio is a parameter used to characterize the changes in the first and second output voltages. including .

[0040] Furthermore, the first power parameter is determined by combining the second output voltage and the resistance value of the load device, and is used to characterize the power generated by the solar power panel output in the load device after the load device is connected. The second power parameter is determined by analyzing the voltage difference between the first and second output voltages and the resistance value, and is used to characterize the amount of power change caused after the load device is connected.

[0041] During the operation of a solar power generation panel, the output terminal of the solar power generation panel is voltage-divided by the load device due to the on / off switching of the switching element, and the power at the output terminal of the solar power generation panel changes accordingly. , the It is necessary to determine the output power parameters by combining the first output voltage, the second output voltage, and the resistance value of the load device, and to ensure that the output power parameters can reasonably characterize the output status of the solar power generation panel. It's okay to have it. .

[0042] Specifically, the power parameters in the operating state of the load device of the solar power generation system when the switching element is turned on are determined by combining the second output voltage and the resistance value of the load device. (for example First power parameter ) The following can be calculated: the change in power of the solar power generation system when the switching element is on compared to when the switching element is off, by combining the first output voltage, the second output voltage, and the resistance value of the load device. (for example , second power parameter ) It is possible to calculate this.

[0043] According to the above solution, the output of the solar power generation panel is detected using the first power parameter, the second power parameter, and the output electrical parameter ratio, and the accuracy of determining the connection to the solar power generation panel is effectively improved.

[0044] As shown in Figure 5, example So, step 204 includes step 502. That's fine. .

[0045] Step 502 includes controlling the connection of a microinverter to a solar power generation panel and operating it if the output power parameter and the output electrical parameter ratio satisfy predetermined parameter conditions, and the first output voltage and the second output voltage satisfy predetermined output conditions.

[0046] Specifically, the predetermined parameter conditions are predetermined conditions that must be met by the output power parameter and output electrical parameter ratio when the solar power generation panel is operated to allow access to the microinverter and supply power to electrical equipment. including The predetermined output conditions are the conditions that the first output voltage and the second output voltage must satisfy when the solar power generation panel is connected to a microinverter and operated to supply power to electrical equipment.

[0047] The controller has predetermined parameter conditions and predetermined output conditions stored in it. The controller analyzes based on the first and second output voltages to determine the output power parameters and output electrical parameter ratio, and then determines whether the output power parameters and output electrical parameter ratio satisfy the predetermined parameter conditions. After obtaining the first and second output voltages, the controller further determines whether the first and second output voltages satisfy the predetermined output conditions. Finally, if the output power parameters and output electrical parameter ratio satisfy the predetermined parameter conditions, and the first and second output voltages satisfy the predetermined output conditions, the controller controls the system to connect a microinverter to the solar power generation panel and operate it, supplying power to electrical equipment via the microinverter. If the output power parameters and output electrical parameter ratio do not satisfy the predetermined parameter conditions, and / or if the first and second output voltages do not satisfy the predetermined output conditions, the controller does not control the system to connect a microinverter to the solar power generation panel and operate it.

[0048] According to the above solution, the output power parameter and the output electrical parameter ratio are determined based on the first output voltage, the second output voltage, and the resistance value of the load device. When the output power parameter and the output electrical parameter ratio, as well as the first and second output voltages, satisfy certain conditions, the system controls the operation by connecting a microinverter to the solar power generation panel, resulting in high accuracy in connection control.

[0049] Furthermore, the operation by which the controller determines whether the first output voltage and the second output voltage satisfy predetermined output conditions is performed by one example Alternatively, this operation may be performed after the controller has determined whether the output power parameters and the output electrical parameter ratio satisfy predetermined parameter conditions. In this case, the determination operation may be performed only if the controller has determined that the output power parameters and the output electrical parameter ratio satisfy predetermined parameter conditions; otherwise, it is not necessary to determine whether the first output voltage and the second output voltage satisfy predetermined output conditions.

[0050] Another example Therefore, this may be performed before the controller determines whether the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions. In this case, since the controller has determined that the first output voltage and the second output voltage satisfy the predetermined output conditions, it is necessary to determine whether the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions; otherwise, it is not necessary to determine whether the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions.

[0051] Furthermore, other example This may be performed before the controller determines the output power parameters and output electrical parameter ratio based on the first and second output voltages. In this case, the controller must determine the output power parameters and output electrical parameter ratio if it has determined that the first and second output voltages satisfy the predetermined output conditions; otherwise, it does not need to determine the output power parameters and output electrical parameter ratio.

[0052] Note that the calculation method for the first and second power parameters is not unique; more detailed methods exist. example The calculation method for the first power parameter is b^2 / R1=f, where f represents the first power parameter, b represents the second output voltage, and R1 represents the resistance value of the load device. In other words, the first power parameter is obtained by squaring the second output voltage and dividing by the resistance value.

[0053] The calculation method for the second power parameter is (ab)^2 / R1=g, where g represents the second power parameter, a represents the first output voltage, b represents the second output voltage, and R1 represents the resistance of the load device. In other words, the second power parameter is obtained by squaring the voltage difference between the first and second output voltages and dividing the result by the resistance.

[0054] One example The method for calculating the output electrical parameter ratio is b / a=h, where h represents the output electrical parameter ratio, a represents the first output voltage, and b represents the second output voltage. In other words, the ratio of the second output voltage to the first output voltage is defined as the output electrical parameter ratio.

[0055] one example Therefore, the output power parameter and the output electrical parameter ratio satisfying predetermined parameter conditions include the first power parameter satisfying the first parameter condition, the second power parameter satisfying the second power parameter condition, and the output electrical parameter ratio satisfying the third parameter condition.

[0056] in particular ,aboveCorresponding to the fact that the output power parameters include a first power parameter and a second power parameter, the controller sets corresponding parameter conditions for each parameter and determines whether the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions. In this case, it is necessary to sequentially determine whether the first power parameter satisfies the first parameter condition, whether the second power parameter satisfies the second power parameter condition, and whether the output electrical parameter ratio satisfies the third parameter condition. Finally, if all three parameters simultaneously satisfy the corresponding parameter conditions, it is determined that the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions; otherwise, it is determined that the output power parameters and the output electrical parameter ratio do not satisfy the predetermined parameter conditions.

[0057] According to this solution, by determining whether the first power parameter satisfies the first parameter condition, whether the second power parameter satisfies the second power parameter condition, and whether the output electrical parameter ratio satisfies the third parameter condition, it is possible to determine whether the output power parameter and the output electrical parameter ratio satisfy predetermined parameter conditions, and the determination accuracy is high.

[0058] one example So, how does it work? 、 The One power parameter satisfies the first parameter condition. Whether or not (for example, The first power parameter is greater than or equal to the first predetermined power threshold. To decide whether or not The The two power parameters satisfy the condition of the second parameter. Whether or not (for example, The second power parameter is less than or equal to the second predetermined power threshold. To decide whether or not Out The force-electrical parameter ratio satisfies the third parameter condition. Whether or not (for example, The output electrical parameter ratio is greater than or equal to a predetermined ratio threshold. To decide whether or not It includes at least one of the following.

[0059] TheA first predetermined power threshold, a second predetermined power threshold, and a predetermined ratio threshold are set for the first power parameter, the second power parameter, and the output electrical parameter ratio, respectively. Therefore, during actual operation, it is possible to determine whether the first power parameter satisfies the first parameter condition by determining whether the first power parameter is equal to or greater than the first predetermined power threshold. In addition or alternatively By determining whether the second power parameter is below the second predetermined power threshold, it is possible to determine whether the second power parameter satisfies the second parameter condition. In addition or alternatively By determining whether the output electrical parameter ratio is above a predetermined ratio threshold, it is possible to determine whether the output electrical parameter ratio satisfies the third parameter condition.

[0060] One example The controller then acquires the first power parameter, the second power parameter, and the output electrical parameter ratio, analyzes the first power parameter by comparing it to a first predetermined power threshold, analyzes the second power parameter by comparing it to a second predetermined power threshold, and analyzes the output electrical parameter ratio by comparing it to a predetermined ratio threshold, thereby determining whether the output power parameter and the output electrical parameter ratio satisfy the predetermined parameter conditions.

[0061] The By setting different thresholds for the first power parameter, the second power parameter, and the output electrical parameter ratio, But often By comparing with a threshold value, it is possible to determine whether the corresponding parameter conditions are met. This method has the advantages of being simple and highly efficient, and can effectively improve the operating efficiency of solar power generation panels.

[0062] As shown in Figure 6, example Before step 204, the method further includes steps 602, 604, 606, and 608. That's fine. .

[0063] Step 602 obtains the minimum system power consumption and minimum load power consumption of the solar power generation system, as well as the open-circuit voltage and operating voltage of the solar panels.

[0064] In step 604, a first predetermined power threshold is determined based on the minimum system power consumption and the minimum load power consumption.

[0065] In step 606, a second predetermined power threshold is determined based on the open-circuit voltage.

[0066] In step 608, a predetermined ratio threshold is determined based on the open-circuit voltage and the operating voltage.

[0067] Specifically, steps 602 to 608 may be executed between steps 202 to 204, or before step 202, and are not specifically limited. example When a solar power generation system is connected and the electrical equipment is fixed, the minimum system power consumption and minimum load power consumption of the solar power generation system, as well as the open-circuit voltage and operating voltage of the solar power generation panels, are basically the same. Therefore, when the operation method of this invention is executed for the first time, the operations in steps 602 to 608 can be performed, and the determined first predetermined power threshold, second predetermined power threshold, and predetermined ratio threshold can be stored in the controller and subsequently recalled when the operation method is executed. In response to this, if the electrical equipment or solar power generation panels in the solar power generation system change, it is necessary to perform the operations in steps 602 to 608 again to update the first predetermined power threshold, second predetermined power threshold, and predetermined ratio threshold.

[0068] When the controller needs to detect the output of the solar panels, the controller retrieves the minimum system power consumption and minimum load power consumption of the solar power system, as well as the open-circuit voltage and operating voltage of the solar panels. The controller analyzes the minimum system power consumption and minimum load power consumption in combination to determine a first predetermined power threshold, then determines a second predetermined power threshold by combining it with the open-circuit voltage, and finally determines a predetermined ratio threshold by combining the open-circuit voltage and operating voltage.

[0069] For more details, see example The first predetermined power threshold is the system's minimum power consumption + the load's minimum power consumption + a fixed power value. The fixed power value is not unique and can be selected as needed, such as 10W, 20W, or 30W, and is not specifically limited.

[0070] The method for determining the second predetermined power threshold in combination with the open-circuit voltage is specifically (kk*0.5)^2 / R1. But often Here, * represents multiplication, ^ represents squaring, k represents the open-circuit voltage, and R1 represents the resistance value of the load device. That is, the second predetermined power threshold is obtained by squaring (kk*0.5) and dividing by the resistance value.

[0071] The predetermined ratio threshold is related to the open-circuit voltage and the operating voltage, and is obtained by multiplying the ratio corresponding to the open-circuit voltage and the operating voltage. Specifically, the ratio should be set according to the actual requirements.

[0072] For example, in more detailed embodiments, the predetermined ratio threshold may be 0.7, 0.8, or 0.9, and is not specifically limited.

[0073] According to the above solution, the first predetermined power threshold, the second predetermined power threshold, and the predetermined ratio threshold are determined by combining the minimum system power consumption, the minimum load power consumption, the open-circuit voltage, and the operating voltage. The accuracy of the predetermined parameter conditions is guaranteed by combining the analysis and judgment of the output power parameters and the output electrical parameter ratio with the actual state of the photovoltaic power generation system.

[0074] one example Therefore, the condition that the first output voltage and the second output voltage satisfy the predetermined output conditions includes the condition that both the first output voltage and the second output voltage are within the predetermined input voltage range.

[0075] Specifically, the specified input voltage range is the voltage range that electrical equipment connected to the solar power generation system needs to input during normal operation. exampleIn this solution, the controller acquires a first output voltage and a second output voltage, then analyzes the first output voltage and the second output voltage by comparing them with a predetermined input voltage range. If both the first output voltage and the second output voltage are within the predetermined input voltage range, the controller determines that the first output voltage and the second output voltage satisfy the predetermined output conditions.

[0076] Furthermore, the magnitude of the predetermined input voltage range is not unique; it should be set according to the actual scenario, as the type of electrical equipment connected to the microinverter will differ. For example, a more detailed... example Alternatively, the specified input voltage range may be set to 80V to 100V.

[0077] In this way, when both the first and second output voltages are within a predetermined input voltage range, it is determined that the predetermined output conditions are met, thereby ensuring that the output voltage of the solar power generation panel meets the power demand of the electrical equipment.

[0078] As shown in Figure 7, example Before step 302, the method further performs steps 702 and 704. It may be included. .

[0079] Step 702 involves obtaining the output terminal voltage of the solar power generation panel.

[0080] In step 704, if the output terminal voltage satisfies the predetermined operating conditions, the operating state of the switching element is verified.

[0081] Specifically, if it is determined that the output of the solar power generation panel needs to be detected based on a power supply command, then it is necessary to first acquire and analyze the output terminal voltage of the solar power generation panel. The output terminal voltage satisfies the predetermined operating conditions ( for example If the output terminal voltage is above a predetermined operating voltage threshold, the controller further detects the operating state of the switching element, and finally, based on the operating state of the switching element, obtains the first output voltage and the second output voltage, respectively, and decides whether or not to connect to the solar power generation panel.

[0082] According to the above solution, when the controller receives a power supply command, it analyzes and determines whether or not to connect to the solar power generation panel, ensuring that the solar power generation panel supplies power in a state that matches the electrical equipment, thereby improving the power supply reliability of the solar power generation panel.

[0083] one example Therefore, controlling the operation of a solar power generation panel by connecting it to a microinverter includes controlling the switch devices connected to the solar power generation panel and the microinverter, respectively, to be turned on.

[0084] Specifically, the microinverter is connected to electrical equipment. example In this solution, a switch device is further provided between the solar power generation panel and the microinverter. This switch device is connected to a controller, and the controller can connect or disconnect the microinverter to the solar power generation panel by controlling the on / off state of the switch device. When the microinverter is connected to the solar power generation panel, electrical energy can be output to electrical equipment via the microinverter. When the microinverter is not connected to the solar power generation panel, the electrical equipment is in a state of no electricity and stops operating.

[0085] Furthermore, there isn't just one specific type of switch device; the model number of the solar power generation panel varies, and the corresponding switch device selection also differs. For example, example Therefore, by using a DC converter as a switching device and controlling the starting and stopping of the DC converter, it is possible to achieve connection control between the solar power generation panel and the microinverter. example Therefore, a power switch or relay may be used as the switching device, and the choice should be made according to the actual situation; it is not limited to this method.

[0086] the above methodAccording to this, by installing a switch device between the controlled solar power generation panel and the microinverter, connection control between the solar power generation panel and the microinverter can be achieved. It can be This effectively improves the reliability of connection control with solar power generation panels.

[0087] Technical aspects of this application Features To facilitate understanding, the present application will be interpreted and explained below with reference to detailed embodiments.

[0088] First, when the controller receives a power supply command, the controller first checks the output of the solar power generation panel. Power Whether the pressure has reached the predetermined operating condition. (For example, Whether the force terminal voltage is greater than a predetermined operating voltage threshold. ) The controller detects the state of the switching element if the predetermined operating conditions are met. It may be configured to be If the switching element is turned off, the current first output voltage a of the solar panel is obtained, and then the switching element is controlled to turn on. It is possible Next, obtain the second output voltage b of the solar power generation panel.

[0089] Subsequently, the controller combines the first output voltage a, the second output voltage b, and the resistance value R1 of the load device (which may be a resistor) to calculate the first power parameter f, the second power parameter g, and the output electrical parameter ratio h. It may be configured to Specifically, b^2 / R1=f, (ab)^2 / R1=g, and b / a=h.

[0090] Next, it is determined whether f is greater than or equal to a first predetermined power threshold (which may be the minimum system power consumption + minimum load power consumption + fixed power value), whether g is less than or equal to a second predetermined power threshold (the second predetermined power threshold may be (kk*0.5)^2 / R1), whether the output electrical parameter ratio is greater than or equal to a predetermined ratio threshold (obtained by multiplying the ratio corresponding to the open-circuit voltage and the operating voltage, which may be 0.8), and whether both the first output voltage a and the second output voltage b are within a predetermined input voltage range. If all of the above determinations are yes, it is determined that the output power parameters and the output electrical parameter ratio satisfy the predetermined parameter conditions, and the first output voltage and the second output voltage satisfy the predetermined output conditions. At this time, the controller controls the switch device to be turned on or turned on, and the electrical energy output from the solar power generation panel is transmitted to the electrical equipment via the switch device and the microinverter.

[0091] Each of the above example In the flowchart relating to the above, each step is shown sequentially according to the arrows, but please understand that these steps are not necessarily performed sequentially in the order indicated by the arrows. Unless otherwise explicitly stated herein, the execution of these steps is not limited to a strict order, and these steps may be performed in other orders. example At least some of the steps in the flowchart relating to this may include multiple steps or stages, and these steps or stages do not necessarily have to be executed and completed at the same time, but may be executed at different times, and the execution order of these steps or stages does not necessarily have to be sequential, but may be executed sequentially or alternately with other steps or at least some of the steps or stages in other steps.

[0092] As shown in Figure 1, the present invention further provides a photovoltaic power generation system. The photovoltaic power generation system includes a load device R1, a microinverter 102 connected to electrical equipment, a photovoltaic panel 101 whose output terminals are connected to the first terminal of the load device R1 and the microinverter 102, a voltage collector 103 provided at the output terminal of the photovoltaic panel 101, a switching element Q1 whose first terminal is connected to the second terminal of the load device R1 and whose second terminal is grounded, and a controller (not shown) connected to the voltage collector 103 and the third terminal of the switching element Q1 to realize the steps of the above operation method.

[0093] Specifically, the specific implementation methods of the operation method are as follows: example As shown, the explanation is omitted here. In the above photovoltaic power generation system, a series-connected load device R1 and switching element Q1 are connected to the output terminal of the photovoltaic power generation panel 101. But often When a power supply command is received and the system is turned on to supply power to electrical equipment, first, the output power parameter and output electrical parameter ratio of the solar power generation panel 101 are determined. , out By combining the power parameters and the output electrical parameter ratio, the connection state between the solar power generation panel 101 and the microinverter 102 is adjusted. It's fine (for example, the controller is, The output power parameters and the output electrical parameter ratio are combined to determine whether or not to connect the microinverter 102 to the solar power generation panel 101. (You may do so.) By analyzing the output of the solar power generation panel 101, it is possible to determine whether or not to control the solar power generation panel 101 to operate with the microinverter 102 connected, based on the actual output status of the solar power generation panel 101. In this way, even without knowing the specifications of the solar power generation panel, and Whether the time of day for solar power generation panel 101 was daytime or nighttime. Regardless , connection control between the microinverter 102 and the solar power generation panel 101 to This allows for improved connection reliability with the solar power generation panel 101.

[0094] one example So, the load device R1 is a resistor. Equipped with .

[0095] Specifically, the load device R1 does not have to be a single type; any element capable of consuming electrical energy as a load will suffice. example In the solution, the load device R1 may be a resistor, specifically a single resistor, or a resistor assembly consisting of multiple resistors connected in series and / or parallel. example Therefore, the load device R1 may be an energy-consuming element such as an indicator light.

[0096] Similarly, the specific type of switching element Q1 is not unique, but rather one. example So, the switching element Q1 is a power switch transistor or a relay. You can The power switch transistor may be a transistor, a field-effect transistor, or an insulated-gate bipolar transistor, and is not specifically limited to such transistors.

[0097] As shown in Figure 8, example So, the solar power generation system uses switch device 801 (For example, switching elements) It further includes the output of the solar power generation panel 101 Power via the switch device 801 to the microinverter 102 join It will be done.

[0098] Specifically, this example In this solution, a switch device 801 is further provided between the solar power generation panel 101 and the microinverter 102. But oftenThe switch device 801 is connected to a controller, which controls the on / off state of the switch device 801 to either connect the microinverter 102 to the solar power generation panel 101 or disconnect the connection to the microinverter 102. When the microinverter 102 is connected to the solar power generation panel 101, electrical energy can be output to electrical equipment via the microinverter 102. When the microinverter 102 is not connected to the solar power generation panel 101, the electrical equipment is in a state of no electricity and stops operating.

[0099] Furthermore, there is not just one specific type of switch device 801; the model number of the solar power generation panel 101 differs, and the corresponding switch device 801 also differs. For example, example Therefore, by using the DC converter as a switch device 801 and controlling the starting and stopping of the DC converter, connection control between the solar power generation panel 101 and the microinverter 102 can be achieved. example Therefore, a power switch or a relay may be used as the switching device 801, and the choice should be made according to the actual situation; it is not limited to this.

[0100] As mentioned above example Each of the technical features is ,set They can be combined, and in order to simplify the explanation, the above example While not all possible combinations of each technical feature in this specification are described, any combination of these technical features should be considered to fall within the scope described herein, provided that there is no inconsistency.

[0101] the above example Some of the present application example While the attached claims represent only the present invention and provide a more specific and detailed explanation, they should not be understood as limiting the scope of the claims. Furthermore, a person skilled in the art could make some modifications and improvements without departing from the concept of this application, and all such modifications and improvements would fall within the scope of protection of this application. Therefore, the scope of protection of this patent is based on the attached claims. [Explanation of symbols]

[0102] 101 Solar panel, 102 Microinverter, 103 Voltage collector, 801 Switching device, Q1 Switching element, R1 Load device

Claims

1. A method for operating a solar power generation system, A step of determining output power parameters and output electrical parameter ratios related to a solar power generation panel using a controller, wherein the solar power generation panel is connected to a load and a microinverter, and the load is connected to a switching element, A step of adjusting the connection state between the solar power generation panel and the microinverter based on the output power parameter and the output electrical parameter ratio, A method of operation characterized by including

2. The step of determining the output power parameter and the output electrical parameter ratio is: The steps include obtaining the first output voltage of the solar power generation panel when the switching element is off, The steps include obtaining the second output voltage of the solar power generation panel when the switching element is turned on, A step of determining the output power parameter and the output electrical parameter ratio based on the first output voltage, the second output voltage, and the resistance of the load, The operating method according to claim 1, which includes the following:

3. The output power parameters include a first power parameter and a second power parameter, and the step of determining the output power parameters and the output electrical parameter ratio is: A step of determining the first power parameter based on the second output voltage and the resistance, A step of determining the second power parameter based on the first output voltage, the second output voltage, and the resistance, A step of determining the output electrical parameter ratio based on the ratio of the second output voltage to the first output voltage, The operating method according to claim 2, characterized by including the following:

4. The step of adjusting the connection state is: The operating method according to claim 3, characterized in that it includes the step of controlling the connection of the microinverter to the solar power generation panel based on the fact that the output power parameter and the output electrical parameter ratio satisfy predetermined parameter conditions.

5. The output power parameter and the output electrical parameter ratio satisfy the predetermined parameter conditions. The operating method according to claim 4, comprising the following: the first power parameter satisfies the first parameter condition; the second power parameter satisfies the second parameter condition; and the output electrical parameter ratio satisfies the third parameter condition.

6. The output power parameter and the output electrical parameter ratio satisfy the predetermined parameter conditions. The first power parameter is greater than or equal to the first threshold, The second power parameter is less than or equal to the second threshold, The output electrical parameter ratio is greater than or equal to the ratio threshold, The operating method according to claim 5, characterized in that it includes at least one of the following.

7. Before the step of adjusting the connection state, the operation method is: The steps include obtaining the minimum system power consumption and minimum load power consumption of the solar power generation system, the open-circuit voltage, and the operating voltage of the solar power generation panel. The steps include determining a first threshold based on the minimum system power consumption and the minimum load power consumption, The steps include determining a second threshold based on the aforementioned open-circuit voltage, The steps include determining a ratio threshold based on the open-circuit voltage and the operating voltage, The operating method according to claim 1, further comprising the following:

8. The operating method according to claim 2, characterized in that the adjustment step is based on the fact that the first output voltage and the second output voltage are each within a predetermined voltage range.

9. Before the step of obtaining the first output voltage of the solar power generation panel, the operation method is: The steps include obtaining the output voltage of the aforementioned solar power generation panel, The steps include verifying the operating state of the switching element based on the fact that the output voltage satisfies predetermined operating conditions, It further includes, Alternatively, the operating method according to claim 4, characterized in that the step of controlling the connection of the microinverter to the solar power generation panel includes the step of controlling the switching element to be turned on.

10. The operating method according to claim 3, characterized in that the first power parameter is obtained by dividing the value obtained by squaring the second output voltage by the resistance.

11. Load and A microinverter connected to electrical equipment, The aforementioned load and the solar power generation panel connected to the microinverter, A switching element connected to the aforementioned load, A controller connected to the switching element, Determine the output power parameters and output electrical parameter ratios related to the aforementioned solar power generation panel. Based on the output power parameters and the output electrical parameter ratio, the connection state between the solar power generation panel and the microinverter is adjusted. A controller configured in such a way, A solar power generation system characterized by including the following:

12. The photovoltaic power generation system according to claim 11, further comprising a voltage collector coupled to the photovoltaic power generation panel and the controller.

13. The solar power generation system according to claim 11, characterized in that the controller is configured to adjust the connection state by controlling the connection of the microinverter to the solar power generation panel.

14. The controller is When the switching element is off, the first output voltage of the solar power generation panel is acquired. When the switching element is on, the second output voltage of the solar power generation panel is acquired. Based on the first output voltage, the second output voltage, and the load resistance, the output power parameter and the output electrical parameter ratio are determined. The photovoltaic power generation system according to claim 13, further configured as described above.

15. The output power parameters include a first power parameter and a second power parameter, and the controller is Based on the second output voltage and the resistance, the first power parameter is determined. Based on the first output voltage, the second output voltage, and the resistance, the second power parameter is determined. The output electrical parameter ratio is determined based on the ratio of the second output voltage to the first output voltage. The photovoltaic power generation system according to claim 14, further configured as described above.

16. The controller is The output voltage of the aforementioned solar power generation panel is obtained, Based on the output voltage satisfying a threshold, the switching element is controlled to be turned on. The photovoltaic power generation system according to claim 11, further configured as follows.

17. The photovoltaic power generation system according to claim 15, characterized in that the first power parameter is obtained by dividing the square of the second output voltage by the resistance.

18. The controller is Based on the output power parameter and the output electrical parameter ratio satisfying predetermined parameter conditions, the system controls the connection of the microinverter to the solar power generation panel. The photovoltaic power generation system according to claim 11, further configured as follows.

19. A method for operating a solar power generation system, A first output voltage of a solar power generation panel when the switching element is off, wherein the solar power generation panel is connected to a load and a microinverter, and the load is connected to a switching element, The second output voltage of the solar power generation panel when the switching element is turned on, The step of determining this using a controller, A step of adjusting the connection state between the solar power generation panel and the microinverter based on the first output voltage and the second output voltage, A method of operation characterized by including

20. The adjustment step is: The operating method according to claim 19, characterized in that it includes the step of adjusting the connection state between the solar power generation panel and the microinverter based on the ratio of the second output voltage to the first output voltage.

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