How to deal with abnormalities in photovoltaic inverters?

It is inevitable that some abnormal phenomena will occur after a thing has been used for a long time, and photovoltaic inverters are no exception. As the core of the entire power station, photovoltaic inverters rarely have abnormalities, but once an abnormality occurs, the consequences are also very serious. At this time, the abnormality needs to be handled as soon as possible. So, how to deal with abnormalities in photovoltaic inverters? The following are several ways to deal with abnormalities in photovoltaic inverters compiled by the editor:

1. Low insulation impedance: Use the elimination method. Unplug all the strings on the input side of the PV inverter, and then connect them one by one. Use the PV inverter's insulation impedance detection function to detect the problematic strings. After finding the problematic strings, focus on checking whether the DC connector has a water-soaked short-circuit bracket or a burnt short-circuit bracket. In addition, check whether there are black spots on the edge of the component itself, causing the component to leak electricity through the frame to the ground grid.

2. Low bus voltage: If it occurs in the morning or evening, it is a normal problem because the photovoltaic inverter is trying to generate power at the limit. If it occurs during normal daytime, the detection method is still elimination method, and the detection method is the same as item 1.

3. DC overvoltage protection: As components pursue high-efficiency process improvements, power levels are constantly updated and increased. At the same time, the open-circuit voltage and operating voltage of components are also increasing. The temperature coefficient issue must be considered during the design phase to avoid overvoltage in low temperature conditions, which may cause hardware damage to the equipment.

4. Grid abnormality: The grid may have large voltage fluctuations or phase angle fluctuations at the user terminal due to problems with the transmission lines and other users.

5. Internal communication failure: Generally, there is a communication problem between the DSP and the communication board of the photovoltaic inverter, and the program needs to be improved. It is recommended to find a professional to improve the program.

6. The photovoltaic inverter does not respond when it is turned on: Please make sure that the DC input line is not connected in reverse. Generally, the DC connector has a foolproof effect, but the crimping terminal does not. It is important to read the photovoltaic inverter manual carefully to ensure the positive and negative poles before crimping. The photovoltaic inverter has built-in reverse short-circuit protection and will start normally after restoring normal wiring.

The above are some methods to deal with abnormalities in photovoltaic inverters. Photovoltaic inverters are electronic devices with complex internal structures. When abnormalities occur, remember not to repair them by yourself. You should find professionals to troubleshoot and then perform targeted repairs.