A Control Method of PV Grid -connected Inverter under Grid Voltage Unbalanced Drops

被引：0
|
作者：
Shang, Liqun [1 ]
Zhu, Weiwei [1 ]
Li, Zhuojun [1 ]
机构：
[1] Xian Univ Sci & Technol, Coll Elect & Control Engn, Xian 710054, Peoples R China
来源：
PROCEEDINGS OF THE 30TH CHINESE CONTROL AND DECISION CONFERENCE (2018 CCDC) | 2018年
关键词：
Low Voltage Ride -through; Grid-connected Inverter; Unbalanced Grid Voltage;
D O I：
暂无
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
To satisfy the requirements of low voltage ride-through (LVRT) capability of PV grid-connected inverter under certain circumstances that three-phase grid voltage shows asymmetrical drops, an unbalance control strategy of the grid -connected inverter is designed in this paper. That means each sequence current values of reference in target current should be reset as it seeks to improve output current on AC side and curb the fluctuation of direct voltage and make PV grid-connected inverter operate well under the unbalanced drops of three-phase voltage, which shall not affect the power quality of power grid. Particularly, when analyzing elaborately the characteristic of inverter on condition that grid voltage shows asymmettical drops, the control target is to suppress negative-sequence current output on AC side and the fluctuation of double frequency of voltage on DC side respectively. A simulation model of grid -connected PV systems is built in MatlablSimulink: and the simulation results indicate the proposed LVRT operation can be realized under unbalanced grid voltage conditions.
引用
收藏
页码：6482 / 6486
页数：5
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