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DEVICE AND METHOD FOR DETECTING INSULATION OF PHOTOVOLTAIC MODULES AGAINST GROUND AND PHOTOVOLTAIC GRID-CONNECTED POWER GENERATION SYSTEM
DEVICE AND METHOD FOR DETECTING INSULATION OF PHOTOVOLTAIC MODULES AGAINST GROUND AND PHOTOVOLTAIC GRID-CONNECTED POWER GENERATION SYSTEM
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机译：检测光伏模块与地面和光伏并网发电系统绝缘的装置和方法
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摘要
A device and method for detecting insulation of photovoltaic modules against ground and a photovoltaic grid-connected power generation system are provided. The detection device includes: a first test resistor, where the first test resistor is connected in parallel to a resistor of a positive terminal of the photovoltaic module relative to ground; a second test resistor, where the second test resistor is connected in parallel to a resistor of a negative terminal of the photovoltaic module relative to ground; a series branch of a third test resistor and a first switching device connected in series, where the series branch is connected to the first or second test resistor in parallel; and a second switching device, where the second switching device is configured to control connection of a common node between the first test resistor and the second test resistor and a ground wire of a photovoltaic inverter, or control connection of the common node and a zero line of a grid. With the technical solutions, reliability of insulation detection of the photovoltaic module against ground can be ensured.
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