一种基于双同步坐标变换的开环锁相方法

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摘要鉴于传统开环锁相方法动态性能好,但频率适应性差且易受三相电压不平衡影响等特点,结合双同步坐标变换概念,提出一种新型的开环锁相方法,即将已知角频率ω₀作为坐标变换的旋转角频率,三相电压信号经过双同步坐标变换后,再经解耦网络实现正负序电压分量的分离,并通过改善传统的低通滤波器来提取其中的差频分量,最后经过基波正序分量提取环节实现电网电压的同步跟踪。与其他几种锁相技术仿真对比和实验结果表明,所提出的锁相方法动态响应速度快、稳态性能好,且有效抑制了三相电压畸变及不平衡。

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关键词 ：双同步坐标变换, 解耦网络, 差频分量, 低通滤波器, 开环锁相技术

Abstract：The traditional open-loop synchronization methods have good dynamic performance but poor frequency adaptability, and are susceptible to the effects of unbalanced three-phase voltage. Combined with double synchronous coordinate transformation concept, a novel open-loop phase-locked method is presented in this paper. The given angular frequency ω₀ is taken as the rotational angular frequency of coordinate transformation. Three-phase voltage signal is converted through double synchronous coordinates. Then, the positive and negative sequence voltage components are separated by decoupling the network. The difference frequency component is extracted by improving the conventional low pass filter. Finally, grid voltage synchronous tracking is achieved through fundamental positive sequence component extraction network. Compared with several other synchro- nization methods, the results show that the proposed open-loop method has fast response speed, high steady-state precision, and can effectively eliminate the unbalanced and distorted grid conditions.

Key words： Double synchronous coordinate transformation decoupling network difference frequency components low pass filter open-loop synchronization method

收稿日期: 2014-05-08 出版日期: 2016-07-12

PACS:

TM464

基金资助:国家自然科学基金（51177095、51277115）和山东省自然科学基金（ZR2011EEM026）资助项目

作者简介: 张勋男,1988年生,硕士研究生,研究方向为电力子在电力系统中的应用。E-mail: 291662565@qq.com王广柱男,1963年生,教授,博士生导师,研究方向为现代电力电子技术及应用和电缆故障诊断技术。E-mail: sdwgz@sdu.edu.cn

引用本文:

张, 勋, 刘汝峰, 王, 婷, 王广柱. 一种基于双同步坐标变换的开环锁相方法[J]. 电工技术学报, 2016, 31(12): 184-192. Zhang Xun, Liu Rufeng, Wang Ting, Wang Guangzhu. An Open-Loop Synchronization Method Based on Double Synchronous Coordinate Transformation. Transactions of China Electrotechnical Society, 2016, 31(12): 184-192.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2016/V31/I12/184

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