Parameter design of the three-phase four-wire testing platform for new energy grid connected devices based on PRR controller

In order to test the performance of grid-connected inverters, a testing platform is proposed in this paper. Back to back PWM converter is the topology of this platform. The rectifier side is a three-phase rectifier, and the inverter side is composed with three single-phase H-bridge inverters. This testing platform can simulate various power quality conditions such as voltage sags, voltage harmonics and frequency offset etc. To improve the dynamic response, voltage and current double-loop control strategy is adopted. PRR controller is proposed to improve the control static accuracy. The control parameters are designed through pole assignment method. These objectives will be demonstrated via experimental results.