针对传统锁相环(PLL)在电网电压不平衡及谐波畸变下利用常规软件锁相环不能准确获取相位的问题,提出了一种新的正负序分量分离新方法。利用了相序解耦谐振控制器能去除高次谐波和延时信号消除(DSC)法可滤除特定谐波的特性,将相序解耦谐振和延时信号消除法结合起来,达到更好的正负序分量分离的效果。最后,采用MATLAB/Simulink软件仿真结果证明了所提出方法的可行性和有效性。

A new positive and negative sequence component separation method was proposed to solve the problem that the traditional PhaseLocked Loop (PLL) can not obtain the phase accurately by using the conventional Software PLL (SPLL) under the condition of grid voltage unbalance. It used the phase Sequence Decoupling Resonant (SDR) controller to better perform the highorder harmonic filtering effect and the Delayed signal cancellation (DSC) have characteristics that could filter out of the specific harmonics, combine SDR and the DSC to achieve a good positive and negative sequence Component separation effect. Finally, the simulation results of MATLAB/Simulink showed that the proposed method was feasible and effective.

TM 71

国家自然科学基金项目(61573239)；上海市重点科技攻关计划项目(14110500700)；上海市自然科学基金项目(15ZR1418600)；上海市电站自动化技术重点实验室项目(13DZ2273800)