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

HUANG Sennian; HAN Bowen; ZHU Gelan; ZHENG Chenling; WANG Gang

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

更新时间：2025-12-08

- Suppression Strategy for Multi-CPL Parallel Resonance of DC Microgrids Based on Virtual RC Control
- Vol. 45, Issue 10, Pages: 3173-3181(2019)
- 作者机构：
  
  1. 广东粤港供水有限公司
  2. 华南理工大学电力学院
  3. 广东电网有限责任公司电力科学研究院
- 作者简介：
- 基金信息：
- DOI：
  CLC：
- Published Online：31 October 2019，
  
  Published：2019
- 稿件说明：
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HUANG Sennian, HAN Bowen, ZHU Gelan, et al. Suppression Strategy for Multi-CPL Parallel Resonance of DC Microgrids Based on Virtual RC Control[J]. 2019, 45(10): 3173-3181.
DOI：

HUANG Sennian, HAN Bowen, ZHU Gelan, et al. Suppression Strategy for Multi-CPL Parallel Resonance of DC Microgrids Based on Virtual RC Control[J]. 2019, 45(10): 3173-3181. DOI：

摘要

为改善电能质量

直流微网中的恒功率负载（CPL）通常配置独立LC滤波器

但参数相近的弱阻尼滤波器并联容易导致LC并联谐振

进而引起CPL输入电压失稳。为此

从直流微网小信号阻抗模型出发

通过推导振荡频率下的降阶电路

揭示了LC并联谐振机理

并分析了滤波器参数差异对LC并联谐振的影响。在此基础上

提出了CPL变换器的虚拟RC控制及其控制参数配置方法

该控制在电流环中附加虚拟RC环节电流来抑制LC并联谐振。最后

在MATLAB/Simulink验证了滤波器参数差异的影响及虚拟RC控制有效性。仿真结果表明

虚拟RC控制在无需增加额外元件前提下

能够近似实现并联电阻电容阻尼的效果。采用所提的控制参数配置方法取虚拟电阻电容为1.38?和480μF后

该控制能够在0.2 s内快速抑制LC并联谐振。

Abstract

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 ? and 480 μF with the proposed control parameter configuration method

the VRCC can quickly suppress LCPR within 0.2 s.

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