POWER CONVERTER AND ISLANDING OPERATION DETECTION METHOD

Abstract: a power converter includes an inverter including an inverter circuit configured to convert a dc power into an ac power, and a reactor provided between the inverter circuit and an interconnection point, and a control device configured to control the inverter as a voltage controlled inverter. the inverter outputs an output voltage superimposed with a harmonic to the interconnection point. the control device generates a first signal obtained by multiplying a signal of the harmonic to an output current measurement value of the inverter, generates a second signal by filtering the first signal, generates a third signal that is an absolute value of the second signal, generates a fourth signal by performing a lowpass filtering process on the third signal, and detects an islanding operation of the inverter based on the third signal and the fourth signal.

Inventor(s): Takashi HAYASHI

CPC Classification: G01R31/40 (Testing power supplies (testing photovoltaic devices ))

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