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AssigneeSungrow Power Supply Co., Ltd.
InventorsYuandong Qian, Cheng Liang, Jiawang Li, Yongheng Qian, Nianan Pan, Zisi Tian, Jin Zhang, He Li, Jingjing Wang, Houzhi Tan
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An inverter and a method for detecting insulation impedance of the inverter are provided. During grid-connected operation of the inverter, the method includes: controlling a power supply to output two different test signals, and recording voltages of a power grid to ground corresponding to the two test signals; and calculating the insulation impedance to ground of the inverter during the grid-connected operation of the inverter according to the two test signals and the voltages of the power grid to ground corresponding to the two test signals. According to the present disclosure, the power supply outputs different test signals to disturb the voltage of the power grid to ground, so as to detect insulation impedance of the inverter during grid-connected operation of the inverter.
A method for detecting insulation impedance of an inverter, applied to an inverter, the inverter comprising a test circuit, the test circuit comprising a test resistor and a power supply connected in series, a direct-current side of the inverter being grounded through the test circuit, or at least one phase of an alternating-current side of the inverter being grounded through the test circuit;
An inverter, comprising a main circuit, a controller and a test circuit, wherein
Dependencies are inferred from the claim text.