Utility Interactive Inverter Using Immittance Converter

Abstract

We have realized a new inverter circuit which works as a complete current type inverter, using an immittance converter link with a high frequency insulation transformer.
This paper proposes a new utility interactive inverter using an immittance converter on a photovoltaic system that supplies the utility source with the power generated by solar cells. Characteristics of this utility interactive inverter are as follows. In the new inverter, the interconnecting reactor which has heavy weight and low efficiency is unnecessary. The inverter output current is in proportion to only the PWM output voltage of the high frequency inverter, independent of the amplitude or the waveform of the utility source voltage. The inverter output current to the utility source can be controlled easily, and can be maintained at the reference value with very fast response even if the utility voltage changes sharply.