The AC voltage overrange is the most common failure of the solar inverter connected with the PV grid system. This is because the grid voltage is not constant and it will change with the changing of the load and current. At the same time, the output voltage of the inverter will be affected by the grid voltage.
However, inverters may encounter various faults during operation. This article will introduce the common faults of inverters in detail, including electrical quantity faults, current problems, frequency and voltage problems, internal component faults, grounding faults and other problems, and provide corresponding solutions. 1.
Reasons why the AC side voltage of the inverter is too high: ① The cable between the inverter and the grid connection point is too thin, too long, entangled, or the cable material is unqualified, causing the voltage on the AC side of the inverter to rise (ΔU increases).
This is because the grid voltage is not constant and it will change with the changing of the load and current. At the same time, the output voltage of the inverter will be affected by the grid voltage. When the grid encounters abnormal situation, the inverter power supply shall be stopped to avoid more serious damage on the grid.
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