Design, development and performance of a 50 kW grid connected PV system with three phase current-controlled inverter

In order to investigate the system performance for grid connection, a 50 kW photovoltaic power generation system including a three-phase DC/AC inverter is designed, made and constructed. This paper describes the system design and the performance of a 50 kW grid-tied PV plant, which consists of solar cells, DC/AC inverter, utility grid. Especially, the control scheme of a three phase current-controlled PWM inverter using d-q axis transformation is presented, and then the experimental results show that the proposed system has high efficiently stable behavior with a unity power factor in utility-interactive operation. Also the field test results show that the system utilization rate is about 13.4%.