Photovoltaic optimizer fault detection equipment

Abstract

The invention provides a photovoltaic optimizer fault detection device, and relates to the technical field of energy. The photovoltaic optimizer fault detection equipment comprises a processor, a power supply module and a first connecting end, wherein the first connecting end is connected with the input end of a photovoltaic optimizer; the power supply module is used for supplying power to the photovoltaic optimizer through the first connecting end, so that the photovoltaic optimizer is started; and the processor is used for acquiring the equipment information of the photovoltaic optimizer under the condition that the photovoltaic optimizer is started, and judging the fault condition of the photovoltaic optimizer based on the equipment information. According to the invention, fault detection can be carried out on the photovoltaic optimizer under the condition of weak illumination or even no illumination.

Description

Technical Field

[0001] The present application relates to the field of energy technology, and in particular to a photovoltaic optimizer fault detection device. Background Art

[0002] With the development of society, the demand for energy in various industries is also increasing. Clean energy is widely used due to its pollution-free and renewable characteristics. Solar energy is one of the more commonly used ones. The photovoltaic system is a system used to convert solar energy into electrical energy. The photovoltaic system is mainly composed of photovoltaic panels (PV panels), photovoltaic optimizers, inverters and energy storage batteries. Among them, photovoltaic panels generate electricity through the photovoltaic effect. Each photovoltaic panel is connected to a photovoltaic optimizer, which can improve the output efficiency of photovoltaic panel strings, reduce the impact of shadows on the performance of photovoltaic systems, and enhance the reliability and performance of photovoltaic systems. It can be seen that photovoltaic optimizers play an important role in photovoltaic systems, and failure of photovoltaic optimizers will have an adverse effect on photovoltaic systems.

[0003] Currently, photovoltaic optimizers have built-in self-test circuits. Under good lighting conditions, the self-test circuit can perform self-tests on the photovoltaic optimizer. However, under poor lighting conditions, the photovoltaic optimizer may not be able to perform normal self-tests because it cannot be powered by the photovoltaic panels. In this case, fault detection of the photovoltaic optimizer cannot be achieved. Summary of the invention

[0004] The present application provides a photovoltaic optimizer fault detection device, which can detect faults of photovoltaic optimizers under poor or even no light conditions. The technical solution includes:

[0005] In a first aspect, a photovoltaic optimizer fault detection device is provided, the photovoltaic optimizer fault detection device comprising a processor, a power module and a first connection terminal, wherein: the first connection terminal is connected to an input terminal of a photovoltaic optimizer. The power module is used to supply power to the photovoltaic optimizer through the first connection terminal so as to start the photovoltaic optimizer. The processor is used to obtain device information of the photovoltaic optimizer when the photovoltaic optimizer is started, and judge the fault condition of the photovoltaic optimizer based on the device information.

[0006] In the technical solution provided in the present application, after the photovoltaic optimizer fault detection device is connected to the photovoltaic optimizer, the built-in power module of the photovoltaic optimizer fault detection device can directly power the photovoltaic optimizer to start the photovoltaic optimizer. In this case, even if the external lighting conditions are poor or even no light, the built-in self-test circuit of the photovoltaic optimizer can also perform self-test on the photovoltaic optimizer. The photovoltaic optimizer fault detection device can obtain the device information of the photovoltaic optimizer self-test through the processor to determine whether the photovoltaic optimizer is faulty. It can be seen that in this technical solution, fault detection of the photovoltaic optimizer can be achieved even under poor lighting conditions or even no lighting conditions.

[0007] In a possible implementation, the photovoltaic optimizer fault detection device further includes a memory connected to the processor. The processor is further configured to read a software installation package of the photovoltaic optimizer from the memory and send the software installation package to the photovoltaic optimizer when receiving a software update instruction.

[0008] In the technical solution provided in the present application, the photovoltaic optimizer fault detection device performs software updates on the photovoltaic optimizer, because the photovoltaic optimizer fault detection device can provide a stable voltage to the photovoltaic optimizer, thereby ensuring that the photovoltaic optimizer can perform software updates normally, thereby avoiding the problem of software update failure caused by the photovoltaic optimizer being unable to be powered due to poor lighting conditions or no light.

[0009] In one possible implementation, the processor is used to perform PLC communication with a photovoltaic optimizer.

[0010] In a possible implementation, the photovoltaic optimizer fault detection device further includes the second connection terminal, wherein the second connection terminal is connected to the output terminal of the photovoltaic optimizer via a power line. The processor is configured to perform power line communication (PLC) communication with the photovoltaic optimizer via the power line.

[0011] In the technical solution provided in this application, the power line connecting the photovoltaic optimizer and the photovoltaic optimizer fault detection device can be reused, so that the processor of the photovoltaic optimizer fault detection device and the photovoltaic optimizer can perform PLC communication. No other communication components need to be added, which can effectively save costs.

[0012] In one possible implementation, the photovoltaic optimizer fault detection device also includes an electrical parameter detection module, wherein: the electrical parameter detection module is used to detect electrical parameters of the output end of the photovoltaic optimizer through the second connection end when the photovoltaic optimizer is started, and send the electrical parameters to the processor, wherein the electrical parameters include one or more of voltage, current, and impedance.

[0013] In the technical solution provided by the present application, in addition to obtaining the device information of the photovoltaic optimizer self-test, the photovoltaic optimizer fault detection device can also detect the device information of the photovoltaic optimizer through the built-in electrical parameter detection module, such as one or more of voltage, current, and impedance, so that the processor of the photovoltaic optimizer fault detection device can determine whether the photovoltaic optimizer has a hardware fault based on the electrical parameters. In this way, the accuracy of photovoltaic optimizer fault detection is improved.

[0014] In a possible implementation, the processor is configured to determine whether a photovoltaic optimizer has a hardware fault according to the electrical parameter and a threshold range.

[0015] In the technical solution provided by the present application, corresponding thresholds can be configured for voltage, impedance, and current. After obtaining the voltage at the output end of the photovoltaic optimizer, the obtained voltage can be compared with the threshold range of the voltage. After obtaining the impedance at the output end of the photovoltaic optimizer, the obtained impedance can be compared with the threshold range of the impedance. After obtaining the current at the output end of the photovoltaic optimizer, the obtained current can be compared with the threshold range of the current. If the electrical parameter is not within the corresponding threshold range, it can be determined that the photovoltaic optimizer has a hardware fault.

[0016] In a possible implementation, the processor is further configured to calculate the power consumption of the photovoltaic optimizer according to the detected electrical parameters of the photovoltaic optimizer, and determine whether the power consumption of the photovoltaic optimizer is abnormal.

[0017] In the technical solution provided in the present application, it is also possible to detect whether the power consumption of the photovoltaic optimizer is abnormal, thereby more comprehensively determining whether the photovoltaic optimizer is faulty.

[0018] In one possible implementation, the processor of the photovoltaic optimizer fault detection device can control the output voltage of the power module. The processing can be as follows:

[0019] The processor receives the startup voltage setting instruction, and controls the power module to provide the voltage indicated by the startup voltage setting instruction to the photovoltaic optimizer through the input terminal.

[0020] In the technical solution provided in the present application, the processor of the photovoltaic optimizer fault detection device can control the output voltage of the power module, so that the photovoltaic optimizer fault detection device can support photovoltaic optimizers with different voltage requirements and has a wider range of applications.

[0021] In a possible implementation, the device information includes one or more of over-temperature indication information, over-voltage indication information, over-current indication information, error correction code ECC fault indication information, and system mode indication information, wherein: the over-temperature indication information is used to indicate whether the photovoltaic optimizer has an over-temperature fault, the over-voltage indication information is used to indicate whether the photovoltaic optimizer has an over-voltage fault, the over-current indication information is used to indicate whether the photovoltaic optimizer has an over-current fault, the ECC fault indication information is used to indicate whether the read-only memory ROM of the photovoltaic optimizer has an ECC fault, and the system mode indication information is used to indicate whether the operating system of the photovoltaic optimizer is in the BootLoader state.

[0022] In the technical solution provided in the present application, the equipment information of the photovoltaic optimizer self-test may include one or more of temperature indication information, overvoltage indication information, overcurrent indication information, error correction code ECC fault indication information, and system mode indication information.

[0023] In a possible implementation, the photovoltaic optimizer fault detection device further includes an indicator device, wherein: the indicator device is connected to the processor. The processor is also used to control the indicator device to issue fault indication information according to the fault condition.

[0024] In a possible implementation, the indicating device is a display screen, and the fault indication information is fault indication text. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 is a schematic diagram of a photovoltaic system provided in an embodiment of the present application;

[0026] Figure 2 is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application;

[0027] Figure 3 is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application;

[0028] Figure 4 is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application;

[0029] Figure 5 is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application;

[0030] Figure 6 is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application;

[0031] Figure 7 It is a structural schematic diagram of a photovoltaic optimizer fault detection device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0032] In order to make the objectives, technical solutions and advantages of the present application clearer, the implementation methods of the present application will be further described in detail below with reference to the accompanying drawings.

[0033] The concepts involved in this application are explained below:

[0034] Photovoltaic panels

[0035] Photovoltaic panels are the core part of photovoltaic systems, also known as solar panels, which are responsible for converting sunlight energy directly into electrical energy. Photovoltaic panels are composed of multiple solar cells, which are usually silicon-based and can absorb photons in sunlight and release electrons, thereby generating an electric current. The efficiency and area of ​​​​the photovoltaic panels determine how much electricity the system can generate. They are usually installed on rooftops or open areas to maximize the reception of sunlight.

[0036] Photovoltaic Optimizer

[0037] PV optimizers are installed on each PV panel to optimize the performance of the PV panel string. They can perform maximum power point tracking (MPPT) on each PV panel independently, ensuring that the PV panel string can output the maximum power even under partial shading or different lighting conditions. In the presence of shadows or other uneven lighting conditions, PV optimizers can reduce the impact of shadows on the performance of the entire system because they allow each PV panel to work independently rather than as a whole. PV optimizers can also provide safety protection, for example, preventing hot spot effects, rapid shutdown, etc.

[0038] Inverter

[0039] An inverter is a device that converts the direct current (DC) generated by photovoltaic panels into alternating current (AC), because most household and commercial electrical appliances use AC. The inverter is also responsible for adjusting the voltage and frequency to match the requirements of the power grid or the needs of specific equipment. In addition to converting electrical energy, the inverter also has protection functions such as overload protection, short circuit protection and overheating protection to ensure the safe operation of the system. In addition, the inverter may also contain intelligent functions such as remote monitoring, data logging and the ability to integrate with smart home systems.

[0040] The implementation scenario of the embodiment of the present application is described below. The photovoltaic optimizer fault detection device provided in the embodiment of the present application can detect faults of the photovoltaic optimizer. The photovoltaic optimizer can usually be deployed in Figure 1 In the photovoltaic system shown. Figure 1The photovoltaic system may include at least one photovoltaic panel, at least one photovoltaic optimizer, an inverter and a storage battery, wherein the photovoltaic panel is Figure 1 PV panels 1, 2, 3, etc., PV optimizer such as Figure 1 PV optimizer 1, PV optimizer 2, PV optimizer 3, etc. Each PV panel is connected to a PV optimizer, and the output of the PV panel is connected to the input of the PV optimizer, such as Figure 1 The output end of photovoltaic panel 1 is connected to the input end of photovoltaic optimizer 1, the output end of photovoltaic panel 2 is connected to the input end of photovoltaic optimizer 2, and the output end of photovoltaic panel 3 is connected to the input end of photovoltaic optimizer 3. In the case of multiple photovoltaic optimizers, the output ends of multiple photovoltaic optimizers are cascaded and connected to the inverter, such as Figure 1 In the cascaded photovoltaic optimizer shown in the figure, the output end of photovoltaic optimizer 1 is respectively connected to the input end of the inverter and the output end of photovoltaic optimizer 2, the output end of photovoltaic optimizer 2 is then connected to photovoltaic optimizer 3, and the output end of photovoltaic optimizer 3 is then connected to the next photovoltaic optimizer (not shown in the figure). When photovoltaic optimizer 3 is the last photovoltaic optimizer, the output end of photovoltaic optimizer 3 is connected to the input end of the inverter. The energy storage battery is connected to the output end of the inverter, and the energy storage battery can output electric energy stably to the outside in the absence of light.

[0041] In the event that any photovoltaic optimizer in the photovoltaic system is suspected of failing, or when performing routine inspections on any photovoltaic optimizer, relevant personnel can disconnect the photovoltaic optimizer from the photovoltaic system and connect the photovoltaic optimizer fault detection device provided in the embodiments of the present application to the photovoltaic optimizer, so as to perform fault detection on the photovoltaic optimizer using the photovoltaic optimizer fault detection device provided in the embodiments of the present application.

[0042] by Figure 1 Taking the photovoltaic optimizer 1 in the embodiment as an example, when it is necessary to perform fault detection on the photovoltaic optimizer 1, the connection between the photovoltaic optimizer 1 and the photovoltaic panel can be disconnected, and the connection between the photovoltaic optimizer 1 and the inverter and the photovoltaic optimizer 2 can be disconnected. Then, the photovoltaic optimizer fault detection device provided in the embodiment of the present application is connected to the photovoltaic optimizer 1, and fault detection is performed on the photovoltaic optimizer 1 through the photovoltaic optimizer fault detection device provided in the embodiment of the present application.

[0043] Of course, if the photovoltaic optimizer that needs to be fault-detected has not yet been connected to the photovoltaic system, relevant personnel can directly connect the photovoltaic optimizer fault detection device provided in the embodiment of the present application to the photovoltaic optimizer, and perform fault detection on the photovoltaic optimizer through the photovoltaic optimizer fault detection device provided in the embodiment of the present application.

[0044] The photovoltaic optimizer fault detection device provided in the embodiment of the present application includes a processor and a power module. After the photovoltaic optimizer fault detection device and the photovoltaic optimizer are connected, the built-in power module of the photovoltaic optimizer fault detection device can directly power the photovoltaic optimizer, so that the fault detection of the photovoltaic optimizer is no longer affected by light, and the power module can replace the photovoltaic panel to provide stable power to the photovoltaic optimizer, so that the photovoltaic optimizer can operate normally. When the photovoltaic optimizer is powered by the built-in power module of the photovoltaic optimizer fault detection device, the built-in self-test circuit of the photovoltaic optimizer will perform self-tests on some faults of the photovoltaic optimizer, and then, the photovoltaic optimizer fault detection device can obtain the device information of the photovoltaic optimizer through the processor, so as to determine whether the photovoltaic optimizer is faulty.

[0045] The photovoltaic optimizer fault detection device provided in the embodiment of the present application is described below with reference to the accompanying drawings.

[0046] See also Figure 2 The photovoltaic optimizer fault detection device provided in the embodiment of the present application may include a processor 10, a power module 20 and a first connection terminal 30. The processor 10 and the power module 20 may be arranged in a housing, and the first connection terminal 30 is connected to the input terminal of the photovoltaic optimizer.

[0047] The processor 10 may include any one or more processors such as a central processing unit (CPU), a graphics processing unit (GPU), a microprocessor (MP) or a digital signal processor (DSP).

[0048] The power module 20 supplies power to the photovoltaic optimizer through the first connection terminal 30 to start the photovoltaic optimizer. After the photovoltaic optimizer is started, the processor 10 can obtain device information of the photovoltaic optimizer, and then the processor 10 can determine the fault condition of the photovoltaic optimizer based on the obtained device information of the photovoltaic optimizer.

[0049] The photovoltaic optimizer has a built-in self-test circuit, which can perform self-test on the photovoltaic optimizer, obtain device information, and write the device information into a specified register. The self-test circuit can perform self-test on the photovoltaic optimizer periodically, or after receiving a device information acquisition instruction, perform self-test on the photovoltaic optimizer.

[0050] The processor 10 may be configured with a communication module, which can communicate with the photovoltaic optimizer and send a device information acquisition instruction to the photovoltaic optimizer. After receiving the device information acquisition instruction, the photovoltaic optimizer acquires the device information and sends the acquired device information to the processor 10.

[0051] Here, the PV optimizer can obtain device information in the following two ways:

[0052] Case 1:

[0053] After receiving the device information acquisition instruction, the photovoltaic optimizer reads the device information in the specified register.

[0054] Case 2:

[0055] After receiving the device information acquisition instruction, the photovoltaic optimizer performs a self-check on the photovoltaic optimizer through a self-check circuit to obtain the device information.

[0056] The communication method between the processor 10 and the photovoltaic optimizer can be wireless communication, such as Bluetooth communication, Near Field Communication (NFC), Wireless Local Area Networks (WLAN) communication, etc.

[0057] In a possible implementation, the communication method between the processor 10 and the photovoltaic optimizer may also be wired communication, such as power line carrier (PLC) communication, and the communication protocol of the PLC communication may be the Modbus communication protocol, which is a serial communication protocol.

[0058] In case of using PLC communication, see Figure 3 The photovoltaic optimizer fault detection device further includes a second connection terminal 50. The second connection terminal 50 is connected to the output terminal of the photovoltaic optimizer through a power line, and the processor 10 can perform PLC communication with the photovoltaic optimizer through the power line to obtain the self-test device information of the photovoltaic optimizer.

[0059] In a possible implementation, the above-mentioned device information includes one or more of over-temperature indication information, over-voltage indication information, over-current indication information, error correction code (Error Correcting Code, ECC) fault indication information, and system mode indication information, wherein the over-temperature indication information is used to indicate whether the photovoltaic optimizer has an over-temperature fault, the over-voltage indication information is used to indicate whether the photovoltaic optimizer has an over-voltage fault, the over-current indication information is used to indicate whether the photovoltaic optimizer has an over-current fault, the ECC fault indication information is used to indicate whether the read-only memory (Read-Only Memory, ROM) of the photovoltaic optimizer has an ECC fault, and the system mode indication information is used to indicate whether the operating system of the photovoltaic optimizer is in a boot loading (BootLoader) state.

[0060] The self-test circuit of the photovoltaic optimizer can perform over-temperature detection on the photovoltaic optimizer, and generate over-temperature indication information according to the detection result, and write the over-temperature detection information into the specified register. For example, if the detection result of the over-temperature detection is that there is an over-temperature fault, the generated over-temperature indication information is 1, and if the detection result of the over-temperature detection is that there is no over-temperature fault, the generated over-temperature indication information is 0.

[0061] The self-test circuit of the photovoltaic optimizer can perform overvoltage detection on the photovoltaic optimizer, and generate overvoltage indication information according to the detection result, and write the overvoltage detection information into the specified register. For example, if the detection result of the overvoltage detection is that there is an overvoltage fault, the generated overvoltage indication information is 1, and if the detection result of the overvoltage detection is that there is no overvoltage fault, the generated overvoltage indication information is 0.

[0062] The self-test circuit of the photovoltaic optimizer can perform overcurrent detection on the photovoltaic optimizer, and generate overcurrent indication information according to the detection result, and write the overcurrent detection information into the specified register. For example, if the detection result of the overcurrent detection is that there is an overcurrent fault, the generated overcurrent indication information is 1, and if the detection result of the overcurrent detection is that there is no overcurrent fault, the generated overcurrent indication information is 0.

[0063] The self-test circuit of the photovoltaic optimizer can perform ECC detection on the ROM of the photovoltaic optimizer, and generate ECC fault indication information according to the detection result, and write the ECC fault indication information into the specified register. For example, if the detection result of the ECC detection is that there is an ECC fault, the generated ECC fault indication information is 1, and if the detection result of the overcurrent detection is that there is no ECC fault, the generated ECC fault indication information is 0.

[0064] The self-test circuit of the photovoltaic optimizer can detect the system mode of the photovoltaic optimizer, and generate system mode indication information according to the detection result, and write the system mode indication information into the specified register. For example, if the detection result of the system mode is in the BootLoader state, the generated system mode indication information is 1.

[0065] In addition, the temperature indication information, overvoltage indication information, overcurrent indication information, error correction code (ECC) fault indication information, and system mode indication information are stored in different addresses of the register.

[0066] In a possible implementation, the above device information may also include electrical parameters of the output end of the photovoltaic optimizer, and the electrical parameters may be detected by a photovoltaic optimizer fault detection device. Figure 4 The photovoltaic optimizer fault detection device further includes an electrical parameter detection module 70. The electrical parameter detection module 70 detects electrical parameters of the output end of the photovoltaic optimizer when the photovoltaic optimizer is started and not working, and sends the detected electrical parameters to the processor 10.

[0067] The processor 10 determines whether there is a hardware fault in the photovoltaic optimizer according to the received electrical parameters, wherein the electrical parameters include one or more of voltage and impedance.

[0068] Whether to judge based on voltage or impedance can be configured by relevant personnel. For example, relevant personnel can issue a photovoltaic detection equipment hardware detection instruction to the processor 10, and the photovoltaic detection equipment hardware detection instruction can carry electrical parameter indication information. Depending on the different electrical parameters indicated by the electrical parameter indication information, the basis for the processor 10 to judge whether the photovoltaic optimizer has hardware can also be different. The following is an explanation of the following situations:

[0069] Case 1:

[0070] If the electrical parameter indicated by the electrical parameter indication information is voltage, the processor 10 may determine whether the photovoltaic optimizer has a hardware fault according to the voltage at the output end of the photovoltaic optimizer.

[0071] Case 2:

[0072] If the electrical parameter indicated by the electrical parameter indication information is impedance, the processor 10 may determine whether the photovoltaic optimizer has a hardware fault according to the impedance of the output end of the photovoltaic optimizer.

[0073] Case 3:

[0074] If the electrical parameters indicated by the electrical parameter indication information are voltage and impedance, the processor 10 may jointly determine whether the photovoltaic optimizer has a hardware fault based on the voltage and impedance at the output end of the photovoltaic optimizer.

[0075] The electrical parameter detection module 70 may be a detection circuit having the same function as a multimeter, and may detect the voltage, impedance, current, etc. at the output end of the photovoltaic optimizer.

[0076] Corresponding threshold ranges may be configured for both voltage and impedance. For example, the first threshold range of voltage is 0.8V to 1.2V, and the second threshold range of impedance is 800Ω to 1200Ω.

[0077] Correspondingly, for the above situation one, the processor 10 can determine whether the voltage at the output end of the photovoltaic optimizer is within the first threshold range of the voltage. If the voltage at the output end of the photovoltaic optimizer is not within the first threshold range of the voltage, it is determined that there is a hardware failure in the photovoltaic optimizer.

[0078] For the above situation 2, the processor 10 can determine whether the impedance of the output end of the photovoltaic optimizer is within the second threshold range of impedance. If the impedance of the output end of the photovoltaic optimizer is not within the second threshold range of impedance, it is determined that there is a hardware fault in the photovoltaic optimizer.

[0079] For the above situation three, the processor 10 can determine whether the impedance of the output end of the photovoltaic optimizer is within the first threshold range of impedance and determine whether the impedance of the output end of the photovoltaic optimizer is within the second threshold range of impedance. If the impedance of the output end of the photovoltaic optimizer is not within the first threshold range of impedance or the impedance of the output end of the photovoltaic optimizer is not within the second threshold range of impedance, it is determined that there is a hardware fault in the photovoltaic optimizer.

[0080] In a possible implementation, in the solution provided in the embodiment of the present application, the processor 10 can also calculate the power consumption of the photovoltaic optimizer based on any two of the voltage, current, and impedance at the output end of the photovoltaic optimizer, and determine whether the power consumption of the photovoltaic optimizer is abnormal.

[0081] Specifically, it can be determined whether the power consumption of the photovoltaic optimizer is greater than a power consumption threshold. If the power consumption of the photovoltaic optimizer is greater than the power consumption threshold, it is determined that the photovoltaic optimizer has power consumption abnormality.

[0082] Among them, the power consumption threshold can be configured by relevant personnel in the photovoltaic optimizer fault detection device according to the specific model of the photovoltaic optimizer. When using the photovoltaic optimizer fault detection device, the relevant personnel can issue a photovoltaic optimizer model selection instruction to the processor 10, and then, the processor 10 can obtain the power consumption threshold corresponding to the photovoltaic optimizer model indicated by the photovoltaic optimizer model selection instruction.

[0083] In a possible implementation, the voltage provided by the power module 20 to the photovoltaic optimizer can be controlled by the processor 10. Figure 5 , the processor 10 is connected to the power module 20. The processor 10 can receive the startup voltage setting instruction issued by relevant personnel, and control the power module 20 to provide the photovoltaic optimizer with the voltage indicated by the startup voltage setting instruction, so that the photovoltaic optimizer can start.

[0084] Different photovoltaic optimizers may require different operating voltages. In the photovoltaic optimizer fault detection device provided in the embodiment of the present application, relevant personnel can issue a startup voltage setting instruction to the photovoltaic optimizer fault detection device. Accordingly, the processor can control the power module 20 to provide the voltage indicated by the startup voltage setting instruction to the photovoltaic optimizer through the input terminal 50.

[0085] In a possible implementation, the startup voltage setting instruction may be the above-mentioned photovoltaic optimizer model selection instruction. Relevant personnel may configure the correspondence between the photovoltaic optimizer model and the startup voltage in the photovoltaic optimizer fault detection device. After the processor 10 receives the photovoltaic optimizer model selection instruction, it may determine the photovoltaic optimizer model indicated by the photovoltaic optimizer model selection instruction, and then determine the startup voltage corresponding to the photovoltaic optimizer model, so that the processor 10 may control the power module 20 to provide the startup voltage to the photovoltaic optimizer through the input terminal 50.

[0086] In one possible implementation, when the PV optimizer is in working condition, if there is no hardware failure in the PV optimizer, it can output a specified voltage according to instructions. If there is a large error between the actual output voltage and the specified voltage, it can be determined that there is a hardware failure in the PV detection device.

[0087] Accordingly, relevant personnel can issue a power supply voltage setting instruction and a first output voltage setting instruction to the processor 10. The processor 10 controls the power supply module 20 to provide the photovoltaic optimizer with the power supply voltage indicated by the power supply voltage setting instruction. In addition, the processor 10 can also communicate with the photovoltaic optimizer and send a second output voltage setting instruction to the photovoltaic optimizer. Among them, the voltages indicated by the first output voltage setting instruction and the second output voltage setting instruction are the same, and the specific structures of the instructions can be different or the same.

[0088] The electrical parameter detection module 70 detects the actual output voltage of the output terminal of the photovoltaic optimizer, calculates the error value between the actual output voltage and the voltage indicated by the second output voltage setting instruction, and determines that the photovoltaic optimizer has a hardware fault if the error value meets the fault condition. The error value meeting the fault condition may be that the error is greater than an error threshold, and the error threshold may be configured by relevant personnel according to actual conditions. For example, the error threshold is dynamic, and the specific value may be 20% of the voltage indicated by the first output voltage setting instruction.

[0089] In one possible implementation, see Figure 6 The photovoltaic optimizer fault detection device further includes an indicator device 60. The indicator device 60 is connected to the processor 10, and the processor 10 is also used to control the indicator device 60 to issue fault indication information according to the fault condition.

[0090] In a possible implementation, the indicator device 60 is a display screen, and the fault indication information is fault indication text displayed on the display screen.

[0091] The content of the fault indication information may also be different for the fault conditions determined by the above different device information. The device information may include over-temperature indication information, over-voltage indication information, over-current indication information, error correction code (ECC) fault indication information, and system mode indication information obtained by the self-test of the photovoltaic optimizer, and may also include the voltage, impedance, and calculated power consumption of the output terminal of the photovoltaic optimizer detected by the above electrical parameter detection module 70 when the photovoltaic optimizer is started but not in the working state, and may also include the output voltage of the output terminal of the photovoltaic optimizer detected by the above electrical parameter detection module 70 when the photovoltaic optimizer is in the working state.

[0092] For example, when the over-temperature indication information indicates that an over-temperature fault exists, the fault indication information may be "an over-temperature fault exists in the photovoltaic optimizer" displayed on the display screen.

[0093] When the received overvoltage indication information indicates that the photovoltaic optimizer has an overvoltage fault, the fault indication information may be “the photovoltaic optimizer has an overvoltage fault” displayed on the display screen.

[0094] When the overcurrent indication information indicates that the photovoltaic optimizer has an overvoltage fault, the fault indication information may be “the photovoltaic optimizer has an overcurrent fault” displayed on the display screen.

[0095] When the ECC fault indication information indicates that the ROM of the photovoltaic optimizer has an ECC fault, the fault indication information may be “the ROM of the photovoltaic optimizer has an ECC fault” displayed on the display screen.

[0096] When the system mode indication information indicates that the operating system of the photovoltaic optimizer is in the BootLoader state, the fault indication information may be “the photovoltaic optimizer is in the BootLoader state” displayed on the display screen.

[0097] When it is determined that there is a hardware fault in the PV optimizer based on the voltage at the output end when the PV optimizer is started but not working, the fault indication information may be "PV optimizer safety voltage abnormality" displayed on the display screen.

[0098] When it is determined that the PV optimizer has a hardware fault based on the impedance at the output end when the PV optimizer is started but not in working state, the fault indication information may be “abnormal impedance of the PV optimizer when not in working state” displayed on the display screen.

[0099] When it is determined that the PV optimizer has a fault based on the power consumption of the PV optimizer, the fault indication information may be “abnormal power consumption of the PV optimizer” displayed on the display screen.

[0100] When it is determined that the photovoltaic optimizer has a hardware fault based on the output voltage at the output terminal when the photovoltaic optimizer is in a working state, the fault indication information may be "Photovoltaic optimizer MPPT abnormality" displayed on the display screen.

[0101] In a possible implementation, the indicator device 60 may also be an indicator light, which emits lights of different colors as fault indication information according to the different fault conditions.

[0102] In a possible implementation, the indication device 60 may also be an audio output device, such as a speaker, which emits corresponding voices as fault indication information in response to the above-mentioned different fault conditions.

[0103] In one possible implementation, see Figure 7 The photovoltaic optimizer fault detection device also includes a memory 40 , and the memory 40 is connected to the processor 10 .

[0104] The memory 40 may include a volatile memory, such as a random access memory (RAM). The memory 40 may also include a non-volatile memory, such as a read-only memory (ROM), a flash memory, a hard disk drive (HDD), or a solid state drive (SSD).

[0105] The processor 10 is further configured to read the software installation package of the photovoltaic optimizer from the memory 40 upon receiving a software update instruction, and send the software installation package to the photovoltaic optimizer.

[0106] When the photovoltaic optimizer needs software update, relevant personnel can send a software update instruction to the processor 10. After receiving the software update instruction, the processor 10 reads the latest software installation package of the photovoltaic optimizer in the memory 40 and sends it to the connected photovoltaic optimizer.

[0107] In addition, the communication between the photovoltaic optimizer fault detection device and the photovoltaic optimizer can be implemented by the above-mentioned PLC communication, or by other communication methods, which is not limited in the embodiments of the present application.

[0108] All possible implementations described above may be arbitrarily combined to form optional embodiments of the present application, and will not be described in detail here.

[0109] After the photovoltaic optimizer fault detection device provided in the embodiment of the present application is connected to the photovoltaic optimizer, the built-in power module of the photovoltaic optimizer fault detection device can directly power the photovoltaic optimizer, so that the fault detection of the photovoltaic optimizer is no longer affected by light, and the power module can replace the photovoltaic panel to provide stable power to the photovoltaic optimizer, so that the photovoltaic optimizer can operate normally. When the photovoltaic optimizer is powered by the built-in power module of the photovoltaic optimizer fault detection device, the built-in self-test circuit of the photovoltaic optimizer will perform self-tests on some faults of the photovoltaic optimizer, and then, the photovoltaic optimizer fault detection device can obtain the device information of the photovoltaic optimizer through the processor, so as to determine whether the photovoltaic optimizer is faulty.

[0110] In this application, the words such as "first" and "second" are used to distinguish the same or similar items with basically the same effects and functions. It should be understood that there is no logical or temporal dependency between "first" and "second", nor is the quantity and execution order limited. It should also be understood that although the following description uses the terms first, second, etc. to describe various elements, these elements should not be limited by the terms. These terms are only used to distinguish one element from another. For example, without departing from the scope of various examples, the first threshold value can be referred to as the second threshold value, and similarly, the second threshold value can be referred to as the first threshold value. The first threshold value and the second threshold value can both be collectively referred to as threshold values, and in some cases, can be separate and different threshold values.

[0111] The term "at least one" in this application means one or more, and the term "plurality" in this application means two or more.

[0112] The above description is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various equivalent modifications or replacements within the technical scope disclosed in the present application, and these modifications or replacements should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A photovoltaic optimizer fault detection device, characterized in that: The photovoltaic optimizer fault detection device comprises a processor (10), a power module (20) and a first connection terminal (30), wherein: The first connection end (30) is connected to an input end of a photovoltaic optimizer; The power module (20) is used to supply power to the photovoltaic optimizer through the first connection end (30) so as to start the photovoltaic optimizer; The processor (10) is used to obtain device information of the photovoltaic optimizer when the photovoltaic optimizer is started, and to determine a fault condition of the photovoltaic optimizer based on the device information.

2. The photovoltaic optimizer fault detection device according to claim 1, characterized in that: The photovoltaic optimizer fault detection device further comprises a memory (40), wherein the memory (40) is connected to the processor (10); The processor (10) is also used to read the latest software installation package of the photovoltaic optimizer in the memory (40) when receiving a software update instruction, and send the software installation package to the photovoltaic optimizer.

3. The photovoltaic optimizer fault detection device according to claim 1 or 2, characterized in that: The processor (10) is used to perform power line carrier PLC communication with the photovoltaic optimizer to obtain device information of the photovoltaic optimizer.

4. The photovoltaic optimizer fault detection device according to claim 3, characterized in that: The photovoltaic optimizer fault detection device further comprises the second connection terminal (50), wherein: The second connection end (50) is connected to the output end of the photovoltaic optimizer via a power line; The processor (10) is used for performing power line carrier PLC communication with the photovoltaic optimizer via a power line.

5. The photovoltaic optimizer fault detection device according to any one of claims 1 to 4, characterized in that: The photovoltaic optimizer fault detection device further comprises an electrical parameter detection module (70), wherein: The electrical parameter detection module (70) is used to detect electrical parameters of the output end of the photovoltaic optimizer through the second connection end (40) when the photovoltaic optimizer is started, and send the electrical parameters to the processor, wherein the electrical parameters include one or more of voltage and impedance; The processor (10) is used to determine whether there is a hardware fault in the photovoltaic optimizer based on the electrical parameters.

6. The photovoltaic optimizer fault detection device according to claim 5, characterized in that: The processor (10) is used to determine whether the photovoltaic optimizer has a hardware fault according to the electrical parameter and the threshold range.

7. The photovoltaic optimizer fault detection device according to claim 5 or 6, characterized in that: The electrical parameters include at least two of voltage, current and resistance; The processor (10) is further used to calculate the power consumption of the photovoltaic optimizer according to the electrical parameters; According to the power consumption, it is determined whether the power consumption of the photovoltaic optimizer is abnormal.

8. The photovoltaic optimizer fault detection device according to any one of claims 1 to 7, characterized in that: The processor (10) is connected to the power module (20); The processor (10) is also used to receive a startup voltage setting instruction, and control the power module (20) to provide the photovoltaic optimizer with the voltage indicated by the startup voltage setting instruction via the first connection terminal (30).

9. The photovoltaic optimizer fault detection device according to any one of claims 1 to 8, characterized in that: The device information includes one or more of over-temperature indication information, over-voltage indication information, over-current indication information, error correction code ECC fault indication information, and system mode indication information, wherein; The over-temperature indication information is used to indicate whether the photovoltaic optimizer has an over-temperature fault, the over-voltage indication information is used to indicate whether the photovoltaic optimizer has an over-voltage fault, the over-current indication information is used to indicate whether the photovoltaic optimizer has an over-current fault, the ECC fault indication information is used to indicate whether the read-only memory ROM of the photovoltaic optimizer has an ECC fault, and the system mode indication information is used to indicate whether the operating system of the photovoltaic optimizer is in a boot-loading BootLoader state.

10. The photovoltaic optimizer fault detection device according to any one of claims 1 to 9, characterized in that: The photovoltaic optimizer fault detection device further comprises an indicator device (60), wherein: The indicating device (60) is connected to the processor (10); The processor (10) is also used to control the indicating device (60) to issue fault indication information according to the fault condition.

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