一种新型斩波AC/DC/AC变换的单相DVR

针对输入侧采用不可控整流AC/DC/AC结构的单相动态电压恢复器(DVR)输入侧功率因数低,谐波含量高等问题,提出了一种基于PWM斩波变换器的动态电压恢复器来补偿负载两端电压的跌落。该新型拓扑结构采用PWM斩波控制节省了直流侧电容,简化了滤波器设计,使输入侧线路中谐波含量降低,同时达到单位功率因数;电压检测采用单相信号构造成两相信号,利用瞬时无功理论对信号进行检测与处理,实时性高;搭建MATLAB/Simulink仿真和系统实验平台,验证其合理性和可行性。

Single-phase Dynamic Voltage Restorer based on chopper AC / DC / AC conversion

In view of the input side power factor of single-phase dynamic voltage restorer (DVR) which is adopting the structure of AC - DC - AC is low, and harmonic content is high. This paper proposes a dynamic voltage restorer based on PWM chopper converter to compensate the voltage drop of load. The new topology without dc capacitor adopts PWM chopper control and simplifies the filter design. Harmonic content in the circuit is reduced, input side to achieve unity power factor. Single phase signal is constructed into two-phase signals to detective voltage. It is a high real-time by using instantaneous reactive power theory to detection and processing. Finally, we built MATLAB/Simulink simulation and experimental platform to verify the rationality and feasibility of the new structure.