A Control Scheme for Three-Phase Current Source Inverter in Interactive Photovoltaic System

Abstract

A novel PWM control scheme for the three-phase current source inverter in the photovoltaic power system interconnected to the utility is proposed. The PV-array output power can be adjusted by the modulation factor in the proposed PWM pattern. The harmonic components in the output currents can be decreased sufficiently in order to satisfy the conditions of the Interactive Guideline. Furthermore, a new Maximum Power Point Tracking control is proposed. The inverter output current should be detected and the modulation factor may be controlled so as to obtain the maximum effective current. The inverter output power can be maintained on the Maximum Power Point for the fluctuations of panel temperatures, insolation levels and system voltages.