复杂电网下基于双改进型SOGI的三相并网锁相环  

Three-phase PLL based on dual modified SOGI under complex power grid conditions

作　　者：回楠木[1] 王大志[1] 李云路 Hui Nanmu;Wang Dazhi;Li Yunlu(School of Information Science and 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,沈阳110819 [2]沈阳工业大学电气工程学院,沈阳110870

出　　处：《仪器仪表学报》2018年第4期123-132,共10页Chinese Journal of Scientific Instrument

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

摘　　要：同步参考坐标系锁相环（SRF-PLL）被广泛用于电网同步应用。但是,在不平衡、畸变及直流偏移混入等复杂电网条件下,其性能表现不佳。为了提高SRF-PLL的滤波能力,提出一种双改进型SOGI（DMSOGI）滤波环节,并将其与滑动平均滤波器（MAF）同时纳入到SRF-PLL控制回路中形成新的混合滤波器,该混合滤波器可以同时滤除SRF-PLL输入三相电压中的基波电压负序分量、直流偏移电压分量及各次谐波电压分量。通过设置较小的MAF窗口长度,所提出的PLL具有更快的瞬态响应。仿真及实验结果证实了所提出的PLL的有效性。Synchronous reference frame phase locked loop（ SRF-PLL） is widely used in grid synchronization applications. However,under unbalanced,distorted and DC offset mixed grid conditions,its performance is not satisfied. In order to improve the filtering capability of SRF-PLL,a dual modified SOGI（ DMSOGI） filtering scheme is proposed,and incorporated into the SRF-PLL control loop with a moving average filter（ MAF） to design a new hybrid filter. The hybrid filter can filter out the fundamental frequency negative sequence component,DC offset component and each harmonic component in SRF-PLL input three-phase voltage at the same time. By reducing the window length of the MAF,the proposed PLL has faster transient response. The effectiveness of the proposed PLL is proved through simulation experimental results.

关 键 词：二阶广义积分器 谐波 锁相环 直流偏移 滑动平均滤波器 

分 类 号：TH86[机械工程—仪器科学与技术]