引用本文:辛业春,李国庆,王尧,等.基于双dq坐标变换的三相电压锁相环的研究[J].电力系统保护与控制,2014,42(10):114-118.
XIN Ye-chun,LI Guo-qing,WANG Yao,et al.Study of three-phase voltage phase locked loop based on double dq transformation synchronous reference frame[J].Power System Protection and Control,2014,42(10):114-118
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基于双dq坐标变换的三相电压锁相环的研究
辛业春1, 李国庆2, 王尧2, 王振浩2
1.华北电力大学电气与电子工程学院，北京 102206;2.东北电力大学电气工程学院，吉林 吉林 132012
摘要:
提出了一种三相电压不平衡情况下，三相电压基波频率、正序电压分量和负序电压分量相位锁定方法。正序dq坐标变换时，负序电压分量将在dq轴电压分量上产生交流分量，导致基于dq坐标变换的三相电压锁相环存在误差；通过提取负序dq坐标变换中dq轴的直流电压分量，对正序dq坐标变换q轴电压分量进行补偿，从而准确快速锁定正序基波电压相位。通过负序dq坐标中d轴和q轴的直流电压分量检测负序电压初相角，锁定负序电压相位。仿真结果表明，该方法能够快速准确地锁定三相电源在不对称情况下的基波频率、正序电压相位和负序电压相位。
关键词:  双dq坐标变换  三相电压不对称  锁相环
DOI：10.7667/j.issn.1674-3415.2014.10.018
分类号:
基金项目:教育部长江学者和创新团队发展计划资助项目(IRT1114)
Study of three-phase voltage phase locked loop based on double dq transformation synchronous reference frame
XIN Ye-chun1, LI Guo-qing2, WANG Yao2, WANG Zhen-hao2
1.School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;2.College of Electrical Engineering, Northeast Dianli University, Jilin 132012, China
Abstract:
This paper proposes a kind of method of three-phase voltage phase locked loop under three-phase unbalanced voltage. When the positive dq synchronous reference frame transforms, the dq axis voltage component will contain AC component caused by negative sequence voltage component which leads to the error of the three-phase voltage phase locked loop (PLL) based on the dq synchronous reference frame transformation. After the dq axis DC voltage component extracted from negative sequence dq synchronous reference frame transformation compensates positive sequence dq transformation synchronous reference frame q axis voltage component, the positive sequence voltage phase can be locked accurately and quickly. By the way of the negative sequence dq synchronous reference frame d axis and q axis DC voltage component detecting negative sequence voltage initial phase angle, the negative sequence voltage phase can be locked. The simulation results show that, this method can achieve the purpose that three-phase power supply frequency, positive sequence voltage phase and the negative sequence voltage phase can be fast and accurately locked in case of unbalanced three-phase voltage.
Key words:  double dq synchronous reference frame transformation  three-phase voltage unbalanced  phase locked loop
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