Stability Analysis and Damping Enhancement Based on Frequency-Dependent Virtual Impedance for DC Microgrids

被引：178

作者：

Guo, Li ^{[1
]}

Zhang, Shaohui ^{[1
]}

Li, Xialin ^{[1
]}

Li, Yun Wei ^{[2
]}

Wang, Chengshan ^{[1
]}

Feng, Yibin ^{[3
]}

机构：

[1] Tianjin Univ, Sch Elect & Engn Automat, Tianjin 300072, Peoples R China

[2] Univ Alberta, Dept Elect & Comp Engn, Edmonton, AB T6G 1H9, Canada

[3] State Grid Zhejiang Elect Power Corp, Elect Power Sci Res Inst, Hangzhou 310014, Zhejiang, Peoples R China

来源：

IEEE JOURNAL OF EMERGING AND SELECTED TOPICS IN POWER ELECTRONICS | 2017年 / 5卷 / 01期

关键词：

DC microgrid; droop control; frequencydependent-virtual impedance; oscillations; stability analysis; CONSTANT POWER LOADS; HIERARCHICAL CONTROL; VOLTAGE CONTROL; DISTRIBUTED CONTROL; STABILIZATION; SYSTEM; CONVERTERS; STRATEGY;

D O I：

10.1109/JESTPE.2016.2598821

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

080906 [电磁信息功能材料与结构]; 082806 [农业信息与电气工程];

摘要：

This paper focuses on the stability analysis and damping performance improvement of dc microgrids. The smallsignal model of a dc microgrid has been derived. Eigenvalue analysis results reveal the relationship between the system stability and different factors of dc microgrids, including types of dc load, the droop coefficient, line parameters, etc. It shows that the poorly damped LC circuits in dc microgrids reduce the system damping and bring in high frequency oscillations. To improve the damping performance, a frequency-dependent virtual impedance approach is proposed, which can effectively shape the high frequency impedance of the dc bus voltage control units, improve the system stability, and mitigate the oscillations. Detailed design guidelines on virtual impedance to achieve good stability and transient performance are also provided. Simulation and experimental results are obtained to confirm the validity of the proposed approach.

引用

页码：338 / 350

页数：13

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