新型软件锁相环在动态电压恢复器中的应用

动态电压恢复器是一种新型电能质量调节装置,它能有效抑制电网电压波动对敏感负载的影响.针对在电网电压畸变的情况下,需要准确捕获电压基波正序相位的问题,文中提出了一种新型软件锁相环(Soft Phade LockedLoop,SPLL),它能够在电网电压存在跌落、谐波、频漂、三相不平衡等多种情况下准确检测基波正序的相位,从而使动态电压恢复器获得较好的补偿效果.该软件锁相环的理论分析结果已为仿真和实验所验证.

APPLICATION OF SOFT PHASE LOCKED LOOP TECHNIQUE IN DYNAMIC VOLTAGE RESTORER

Dynamic Voltage Restorer (DVR) is a new type of power quality regulating device by which the influence of voltage fluctuation on sensitive loads can be effectively suppressed. Under voltage distortion of power network it is necessary to capture the phase of positive-sequence fundamental component of voltage accurately. Here, a novel soft phase locked loop (SPLL) is put forward by which the phase of positive-sequence fundamental component of voltage can be accurately detected under the condition that in power system the sags, harmonics, frequency variations and voltage unbalance occur, thus a better compensation effect can be achieved by DVR. The result of theoretical analysis for SPLL is verified by simulations and experiments.