UTILITY INTERACTIVE INVERTER OF INDIRECT CURRENT CONTROL TYPE AND CONTROL METHOD THEREOF

摘要

A power system interconnection inverter of an indirect current control type and a control method thereof are provided to regulate system injection current by properly controlling a voltage to be applied to a line inductor. First and second switching elements are connected in series between a power voltage and a ground voltage of a DC power supply. Third and fourth switching elements are connected in series between the power voltage and the ground voltage, and are connected in parallel with the first and second switching elements. An inductor(Lf) is connected to a first node which is a common contact point of the first and second switching elements, to pass a low frequency of a signal output from the first switching element. A capacitor(Cf) is connected between an output terminal of the inductor and a second node. A line inductor(Lg) is connected to one end of the inductor to filter an AC voltage signal. A utility interactive switch(Si) is connected between one end of the line inductor and a secondary coil of a transformer.