PROTECTION SYSTEM AND METHOD FOR PHOTOVOLTAIC GRID-CONNECTED INVERTER
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Aug 4, 2014
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Aug 4, 2014
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Abstract
A system for protecting a grid-connected photovoltaic inverter may include a detection device, a photovoltaic panel, an inverter, a transformer and an inverter controller. An output terminal of the photovoltaic panel is connected to an input terminal of the inverter, the inverter inverts a direct current into an alternating current and transmits it to the transformer a secondary side of the transformer is connected to an output terminal of the inverter, and a primary side is connected to a power grid. The primary side of the transformer is star-connected, and a neutral point is grounded. The detection device is connected between the primary side and the power grid, and is configured to detect whether a single-phase open-circuit fault occurs at the primary side and transmit a fault signal to the inverter controller. The inverter controller is configured to control the inverter to stop according to the fault signal.
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