A Droop Control Strategy with Impedance Compensation for Low Voltage Microgrid

被引：5
|
作者：
Yu, Zhiyong [1 ]
Lu, Ming [1 ]
Wang, Zhennan [1 ]
Zhang, Yigong [1 ]
机构：
[1] North China Elect Power Univ, Beijing 102206, Peoples R China
来源：
MACHINERY ELECTRONICS AND CONTROL ENGINEERING III | 2014年 / 441卷
关键词：
low voltage microgrid; droop control; power sharing; virtual impedance; compensation; INVERTERS;
D O I：
10.4028/www.scientific.net/AMM.441.245
中图分类号：
TP [自动化技术、计算机技术];
学科分类号：
0812 ;
摘要：
With conventional droop control, parallel operation of distributed generations (DG) in microgrid would lead to unbalanced power sharing. In this paper, inherent limitation of conventional droop control is analyzed. Analysis results show that different converter output impedance and line impedance make the power sharing unbalanced. In order to weaken or eliminate impedance difference from point of common coupling (PCC) to DGs, virtual impedance is introduced. By the introduction of designed virtual impedance, a novel droop control strategy with impedance compensation is proposed in this paper. Simulation results are presented from a two converters parallel-connected microgrid, showing the effectiveness of the droop control with impedance compensation. Simulation results show that DGs with proposed approach can allocate the power equally, and work stably in grid-connected mode, island mode and progress of reconnection to grid.
引用
收藏
页码：245 / 248
页数：4
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