不对称电网同步相位的快速开环捕获方法研究.PDF

第35 卷 第22 期 中 国 电 机 工 程 学 报 Vol.35 No.22 Nov.20, 2015 5682 2015 年11 月20 日 Proceedings of the CSEE ©2015 Chin.Soc.for Elec.Eng. DOI ：10.13334/j.0258-8013.pcsee.2015.22.002 文章编号：0258-8013 (2015) 22-5682-10 中图分类号：TM 935 不对称电网同步相位的快速开环捕获方法研究 熊连松，卓放，刘小康，祝明华，陈颖 (西安交通大学电气工程学院，陕西省 西安市 710049) Research on Fast Phase Synchronization Scheme for Three-phase Unbalanced Power System XIONG Liansong, ZHUO Fang, LIU Xiaokang, ZHU Minghua, CHEN Ying (School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, Shaanxi Province, China) ABSTRACT: Prompt and accurate phase detection is an 电压基波正序分量的实时相位。最后，论文提出一种改进的 essential qualification for the control of grid-connected 虚拟正交信号构造方法，有效地提高了构造信号的准确度。 inverters. However, the commonly used phase-locked loop 各种工况下的实验结果同时表明：提出的开环锁相方法可在 methods consume too much time, longer than one grid period, 电网不对称且畸变的恶劣环境下实现快速准确地捕获电网 to lock the new phase under severe grid unbalance condition, 的实时同步相位，具有较强的鲁棒性。 resulting in failing to satisfy the need for high speed and 关键词：开环锁相；虚拟正交信号；对称分量法；谐波消除 accuracy of phase synchronization. In order to solve this 算法 problem, an open-loop phase locking scheme was proposed in this paper. By constructing virtual orthogonal signals and 0 引言 adopting the method of symmetrical components, this scheme [1-6] 现有的电网锁相方法可大致分成两类 ：闭环 first realizes the fast fundamental-frequency positive sequence 锁相与开环锁相。其中，闭环锁相也称为软锁相环 (FFPS) components extracting from the unsymmetrical