Adaptive Control Method of Impedance for Grid-connected Inverters

被引：0
|
作者：
Du Y. [1 ,2 ]
Cui L. [1 ,2 ]
Yang X. [1 ,2 ]
Zhang X. [1 ,2 ]
Wang F. [3 ]
机构：
[1] School of Electrical Engineering and Automation, Hefei University of Technology, Hefei
[2] Research Center for Photovoltaic Systems Engineering of Ministry of Education, Hefei University of Technology, Hefei
[3] School of Mechatronics Engineering and Automation, Shanghai University, Shanghai
来源：
Yang, Xiangzhen (greenleaf_yxz@163.com) | 2018年 / Automation of Electric Power Systems Press卷 / 42期
基金：
中国国家自然科学基金;
关键词：
Adaptive control; Grid-connected inverters; Voltage feedforward; Weak grid;
D O I：
10.7500/AEPS20170809013
中图分类号：
学科分类号：
摘要：
In the condition of a weak grid, the interaction between the grid-connected inverters and the grid might directly lead to the instability of inverters especially for those inverters with grid-voltage feedforward controllers. A serial-parallel impedance reshaping controller is proposed to improve the phase margin at the intersected frequency between the inverter and the grid after analyzing the output impedance characteristics. Moreover, a self-adjusting differential coefficient design method is presented as well after discussing the sensitivity of the differential coefficient to the phase enhancement. With this proposed controller, the system stability and the robustness against grid-voltage-harmonics are improved. The experimental results verify the effectiveness of the proposed control method. © 2018 Automation of Electric Power Systems Press.
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页码：120 / 127
页数：7
相关论文
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