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Grid-connected inverter device and distributed power supply system including grid-connected inverter device
Grid-connected inverter device and distributed power supply system including grid-connected inverter device
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机译：并网逆变器设备和包括并网逆变器设备的分布式电源系统
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摘要
Provided is a grid-connected inverter device that achieves a stable switching operation in a low-current region in the vicinity of the zero-crossing point of grid voltage, and has low loss. The grid-connected inverter device has a bridge circuit, a filter circuit, and a control means that controls the bridge circuit, and the grid-connected inverter device is for supplying power obtained from a DC power source to a commercial power grid via the bridge circuit and the filter circuit in the given sequence. The bridge circuit comprises a plurality of switches, and the control means has: a mode (1) for controlling the switches in a manner so that distortion is suppressed of the current flowing through the commercial power grid during the time period that, with the zero-crossing point of the voltage of the commercial power grid as the origin, is from a predetermined period beforehand to after a predetermined period has elapsed; and a mode (2) for controlling the switches in a manner so that loss in the switches is decreased during the time period that is from after the predetermined period has elapsed to the next predetermined period beforehand.
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