Photovoltaic grid connected inverter island detection method based on negative sequence current injection
A negative-sequence current, islanding detection technology, applied in photovoltaic power generation, measuring electrical variables, instruments, etc., can solve problems such as large harmonics, failure, difficulty, etc.
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[0078] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0079] An islanding detection method for photovoltaic grid-connected inverters based on negative-sequence current injection, figure 1 Schematic diagram of the principle structure of the grid for island detection, such as figure 1 As shown, the electric energy generated by the photovoltaic cell array undergoes DC / DC conversion to make the converted DC voltage meet the grid-connection requirements. At the same time, the maximum power tracking control (MPPT) of the conductance incremental method is adopted in the DC / DC conversion. Through the inverter Convert direct current to alternating current and connect to the grid, and adopt unit power factor current control when PV is connected to the grid. Among them, R f , L f is the resistance and inductance of the AC side filter of the inverter, R s , L s The equivalent resistance and inductance of...
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