A New Dynamic Voltage Restorer with Multi-level Open-end Winding Topology

In this paper, a variety of main circuit structures of DVR based on open-end winding are presented. Two inverters are connected in series to realize the multi-level structure and simplify the hardware cost. According to the mathematical model of open-end DVR, a three loop control strategy based on load voltage feedback is implemented to suppress the resonance of LCL filter. Aiming at the common mode voltage problem of open-end winding DVR, a common mode voltage suppression strategy based SVPWM is proposed to completely suppress the common mode voltage of high frequency and low frequency of the system. Finally, an open-end DVR experimental platform is built to verify the effectiveness of the control strategy and modulation strategy.