适应强不平衡电压抑制的DVR系统设计与特性分析

Design and characteristic analysis of DVR system for strong unbalanced voltage suppression

针对输油管道站场用电网存在三相电压瞬时跌落幅值差异较大的问题,提出了采用每相独立结构的H全桥变流电路和独立变压器拓扑结构设计方案,解决了有关主电路拓扑结构、实现原理等的DVR设计问题,并给出了相应的控制策略和仿真结果。仿真结果表明,基于单相H桥拓扑结构的DVR系统能够实现对电压幅值的获取和频率、相位的跟踪,抑制了电网中存在的谐波,有效地解决了强不平衡电压的抑制问题。

Aiming at the problem of large difference in three-phase voltage instantaneous sag amplitude in power grid of oil pipeline station,a design scheme of H-full-bridge converter circuit with independent structure of each phase and transformer topology is proposed,which solves the DVR design problems related to topological structure and realization principle of main circuit. The corresponding control strategy and simulation results are also given.The simulation results show that the DVR system based on single-phase H-bridge topology can obtain voltage amplitude,track frequency and phase. It can suppress harmonics in power grid,and effectively solve the problem of strong unbalanced voltage suppression.