引用本文:陈东明,陈明亮,谢桢,等.一种基于阀值开关与双环控制的新型锁相环[J].电力系统保护与控制,2015,43(23):41-48.
CHEN Dongming,CHEN Mingliang,XIE Zhen,et al.A novel PLL based on threshold switch and dual-loop control technology[J].Power System Protection and Control,2015,43(23):41-48
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一种基于阀值开关与双环控制的新型锁相环
陈东明1, 陈明亮1, 谢桢1, 王武斌2, 袁雷1
1.海军工程大学舰船综合电力技术国防科技重点实验室，湖北 武汉 430033;2.浙江大学电气工程学院，浙江 杭州 310027
摘要:
级联DSC算法被广泛地应用于提取电网电压正序基波分量，但是该算法存在延时时间内无法工作的问题。针对该问题，设计了级联DSC与正序相序谐振控制器协同控制的方案来分离电压基波分量。为应对不同的电网故障，提出了一种阀值开关技术，将电网故障进行分类，并选取相对应的控制结构来进行优化控制。基于所提方法在Matlab/Simulink中搭建了相应的锁相环模型，仿真结果表明在电网故障及存在谐波污染的条件下，所提的新型锁相环方法能够快速、准确地锁定电网电压相位，并且削弱了故障对锁相环输出频率的影响。
关键词:  锁相环  电网故障  正序相序谐振控制器  阀值开关  双环控制
DOI：10.7667/j.issn.1674-3415.2015.23.007
分类号:
基金项目:国家自然科学基金项目(51377167)
A novel PLL based on threshold switch and dual-loop control technology
CHEN Dongming1, CHEN Mingliang1, XIE Zhen1, WANG Wubin2, YUAN Lei1
1.National Key Laboratory of Vessel Integrated Power System Technology, Naval University of Engineering, Wuhan 430033, China;2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China
Abstract:
The cascading DSC (Delay Signal Cancellation) algorithm has been widely applied in the calculation of the positive sequence components of fundamental voltage. Due to its characteristics, the DSC has the shortcoming of not functioning properly in delay time. To make up for this shortcoming, this paper proposes a coordinated control method of cascading DSC and PSDR (Positive Sequence Decoupled Resonant). Furthermore, a threshold switch method is proposed to classify the grid faults and choose corresponding control strategy. Based on the proposed method, a corresponding PLL model is built in the Matlab/Simulink platform. As is verified in simulation, when faults occur in the power grid while harmonic wave disturbance exits, the proposed novel PLL can obtain accurate phase information of the grid with low time cost and high precision, and it also weakens the fault’s influence upon the output frequency of PLL.
Key words:  PLL  power grid faults  positive sequence decoupled resonant (PSDR)  threshold switch  dual-loop control
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