改进型DSC的并网锁相环直流偏移消除方法  

DC-Offset Elimination Method for Grid-Connected Phase-Locked Loop by Modified DSC

作　　者：回楠木[1] 王大志[1] 李云路 HUI Nan-mu;WANG Da-zhi;LI Yun-lu(School of Information Science&Engineering,Northeastern University,Shenyang 110819,China;School of Electrical Engineering,Shenyang University of Technology,Shenyang 110870,China)

机构地区：[1]东北大学信息科学与工程学院,辽宁沈阳110819 [2]沈阳工业大学电气工程学院,辽宁沈阳110870

出　　处：《东北大学学报（自然科学版）》2018年第11期1526-1531,共6页Journal of Northeastern University(Natural Science)

基　　金：国家自然科学基金重点资助项目(61433004);国家重点研发计划项目(2017YFB130055)

摘　　要：针对在SRF-PLL的控制内环中使用延迟信号消除(DSC)算子,放缓了动态行为问题,提出了一种用于电网同步的三相PLL中的快速直流偏移抑制方法.通过使用改进型DSC运算器(MDSC)方法,改进了传统的基于DSC的PLL的动态性能.该方法能够有效地克服系统带宽给直流偏移消除带来的影响,并使系统响应速度得到提升.另外基于MDSC的PLL在相位跳变和频率阶跃变化的调整时间也很小.所提方法的有效性通过仿真实验结果得到证实.The use of delay signal cancellation(DSC)operator in the control inner loop of SRF-PLL slows down the dynamic behavior.A fast DC-offset rejection method for three-phase PLL of grid synchronization is proposed,which improves the dynamic performance of traditional DSC-based PLL by using the modified DSC operator.This method can effectively overcome the influence of the system bandwidth on the DC-offset elimination and improve the response speed of the system.In addition,the adjustment time of the phase jump and frequency step change based on the MDSC-based PLL is also very small.The effectiveness of the proposed method is confirmed through simulation and experiment results.

关 键 词：直流偏移 同步参考坐标 锁相环 延迟信号消除 相位估计 

分 类 号：TM76[电气工程—电力系统及自动化]