Suppression Strategy for Multi-CPL Parallel Resonance of DC Microgrids Based on Virtual RC Control

被引：0

作者：

Huang S. ^{[1
,2
]}

Han B. ^{[3
]}

Zhu G. ^{[2
]}

Zheng C. ^{[2
]}

Wang G. ^{[2
]}

机构：

[1] Guangdong Yuegang Water Supply Co., Ltd., Shenzhen

[2] School of Electric Power, South China University of Technology, Guangzhou

[3] Electric Power Research Institute of Guangdong Power Grid Co., Ltd., Guangzhou

来源：

Gaodianya Jishu/High Voltage Engineering | 2019年 / 45卷 / 10期

基金：

中国国家自然科学基金;

关键词：

Control parameter configuration; DC microgrid; Filter parameter heterogeneity; LC parallel resonance (LCPR); Reduced circuit; Virtual RC control (VRCC);

D O I：

10.13336/j.1003-6520.hve.20181218005

中图分类号：

学科分类号：

摘要：

To improve the power quality, constant power loads (CPLs) in DC microgrids are usually connected to a DC bus by their own LC filters. However, the paralleling LC filters with weak damping and similar parameters can easily lead to LC parallel resonance, which in turn causes the instability of CPL input voltage. Therefore, from a small-signal impedance model of a DC microgrid, its reduction circuit under the oscillation frequency was deduced, the mechanism of LC parallel resonance (LCPR) was revealed, and the impacts of filter parameter heterogeneity on LCPR were analyzed. On this basis, a virtual RC control (VRCC) strategy, where a virtual RC current was added to the current loop of CPL converter, was proposed to restrain the LCPR, and its parameter configuration method was also introduced. Finally, both the influences of filter parameter heterogeneity and the effectiveness of VRCC were verified in MATLAB/Simulink. Simulation results show that the VRCC can be adopted to achieve the effect of shunt resistance and capacitance damping without adding extra system components. After taking the virtual resistance and capacitance as 1.38 Ω and 480 μF with the proposed control parameter configuration method, the VRCC can quickly suppress LCPR within 0.2 s. © 2019, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：3173 / 3181

页数：8

共 17 条

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