An unbalanced control strategy for microgrid based on adaptive negative sequence current virtual impedance

被引：1
作者：
Ma, Tianyi [1 ]
Jin, Xinmin [1 ]
机构：
[1] School of Electrical Engineering, Beijing Jiaotong University, Beijing
来源：
Dianli Xitong Zidonghua/Automation of Electric Power Systems | 2014年 / 12期
关键词：
Distribution network; Droop control; Secondary control; Unbalanced load; Virtual impedance;
D O I：
10.7500/AEPS20130718012
中图分类号：
学科分类号：
摘要：
The single phase load in a microgrid brings about negative sequence voltage and current, influencing the stability of the microgrid. The parameter difference of micro-source influences negative current distribution and reduces the reliability of the micro-source. The negative sequence voltage increase will reduce the power quality of the microgrid. To solve the above problems, a comprehensive control strategy is proposed under the unbalanced load condition. The self-adaption negative sequence virtual impedance is added to the micro-source, which is regulated by its negative current amplitude. Through the design of self-adaption negative sequence virtual impedance, accurate negative current distribution is realized under the island mode. The impact of negative sequence virtual impedance characteristic change on the point of common coupling (PCC) node voltage unbalance factor is analyzed. In order to reduce the PCC voltage unbalance factor, a kind of secondary voltage compensation method is proposed. The correctness and effectiveness of the control strategy are demonstrated by experiment results.
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页码：12 / 18
页数：6
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