Patent ID: 9337750
Filing Date: 2016-05-10
CPC Classification: H02J,H02M,Y02E

Claim Text:
1. A power conversion apparatus to be applied to a generation system that interconnects with an alternating current power system, the power conversion apparatus comprising: an inverter circuit including a switching element configured to convert a direct current power into an alternating current power; a system voltage measurement unit configured to measure a system voltage of the alternating current power system; a voltage drop detector configured to detect a voltage drop of the alternating current power system, based on the system voltage measured by the system voltage measurement unit; a carrier wave generator configured to generate a carrier wave; a carrier wave frequency modulator configured to increase a frequency of the carrier wave generated by the carrier wave generator such that a ripple of a current output from the inverter circuit does not exceed a setting value of an overcurrent relay provided on an output side of the inverter circuit, when the voltage drop is detected by the voltage drop detector; a signal wave generator configured to generate a signal wave to control the alternating current power output from the inverter circuit; a gate signal generator configured to compare the carrier wave generated by the carrier wave generator with the signal wave generated by the signal wave generator, and to generate a gate signal to drive the switching element; and a power conversion controller configured to perform power conversion control of the inverter circuit by pulse width modulation, based on the gate signal generated by the gate signal generator.