Reactive Power Control of Grid-connected Converter in Distributed Generation System

With the research on reactive power control of grid-connected converter in distributed generation system,a mathematical model of voltage-source line-connected inverter was built.And for active and reactive independent regulation,a strategy with synchronous current PI control based on two phase rotation coordinate was proposed,which consists of double-loop control model,voltage for outer loop and circuit for inner.The main function of outer loop is the voltage inverter control DC side,and the inner loop is to perform current control with the current output of outer loop.Simulation and experimental results showed that the proposed strategy not only realizes independent control of reactive power,but also improve the quality of current.