LCL并网逆变器的电流双闭环控制

刘文军; 周 龙; 陈 剑; 唐西胜; 宋 毅; 何禹清

引用本文:	刘文军,周龙,陈剑,等.LCL并网逆变器的电流双闭环控制[J].电力系统保护与控制,2016,44(17):52-57.
	LIU Wenjun,ZHOU Long,CHEN Jian,et al.Control method for grid-connected inverter with LCL filter by employing dual current closed-loops[J].Power System Protection and Control,2016,44(17):52-57

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LCL并网逆变器的电流双闭环控制
刘文军¹,周龙²,陈剑¹,唐西胜²,宋毅³,何禹清¹
(1.国网湖南省电力公司经济技术研究院，湖南长沙410004;2.中国科学院电工研究所，北京100190; 3..国网北京经济技术研究院，北京102209)

摘要:

采用LCL滤波器作为电压型并网逆变器与电网的接口，建立LCL滤波器的数学模型，提出一种基于电网侧电流外环、逆变器侧电流内环的LCL并网逆变器控制方法。该控制方法既能有效保护功率开关，又能保证系统稳定及并网电流的单位功率因数。针对该电流双闭环控制方法，给出一种基于赫尔维茨稳定判据及李纳德-戚帕特稳定判据的内外环控制器参数设计方案。进行了LCL并网逆变器并网运行仿真与实验。仿真和实验结果验证了所提LCL并网逆变器控制方法的正确性和可行性。

关键词: 并网控制并网逆变器双闭环控制 LCL滤波器功率因数

DOI：10.7667/PSPC151638

分类号:

基金项目:国家自然科学基金项目(51207156)

Control method for grid-connected inverter with LCL filter by employing dual current closed-loops

LIU Wenjun¹,ZHOU Long²,CHEN Jian¹,TANG Xisheng²,SONG Yi³,HE Yuqing¹

(1. Hunan Electric Power Corporation Economical & Technical Research Institute, Changsha 410004, China;
;2. Institute of Electrical Engineering Chinese Academy of Sciences, Beijing 100190, China;
;3. State Power Economic Research Institute, Beijing 102209, China)

Abstract:

A LCL filter is adopted as an interface between grid-connected inverter and power grid. The mathematical model of the LCL filter is built, and then a control method for grid-connected inverter with a LCL filter is proposed. This control method employs an external grid-side current loop and an internal inverter-side current loop. And this control method can not only protect power switches effectively, but also ensure the system stability and high in-grid power factor. Based on the Hurwitz stability criterion and Lienard Chipart stability criterion, the design method of controller parameters in inner and outer loops is derived. Simulations and experiments of grid-connected inverter in grid-connected mode are conducted. Simulation and experimental results validate the correctness and feasibility of the proposed method. This work is supported by National Natural Science Foundation of China (No. 51207156).

Key words: grid-connected control grid-connected inverter dual closed-loop control LCL filter power factor

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