Stability Enhancement Based on Virtual Impedance for DC Microgrids With Constant Power Loads
Stability Enhancement Based on Virtual Impedance for DC Microgrids With Constant Power Loads
复制标题
基于虚拟阻抗的恒功率负载直流微电网稳定性增强
DOI：
10.1109/tsg.2015.2455017
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发表时间：
2015-08
影响因子：
9.6
通讯作者：
Wang, Jianhui
中科院分区：
文献类型：
--
作者：
Guerrero, Josep M.;Vasquez, Juan C.;Huang, Lipei;Wang, Jianhui
本文研究了一种基于变流器的直流微电网。考虑到直流微网中各元件对系统稳定性的影响，采用多级结构，包括电源级、母线间接口换流器级和公共负载级。为了研究上述直流微电网的整体稳定性与恒定功率负载（CPL），一个全面的小信号模型推导出通过分析在每个阶段的接口转换器。利用阻抗匹配准则揭示了CPL引起的不稳定性问题。同时，提出了基于虚拟阻抗的稳定器，以提高阻尼的直流微网与CPL和保证稳定运行。由于下垂控制通常用于在直流微电网中实现适当的负载功率分配，因此在测试所提出的稳定器时考虑了其影响。通过使用建议的稳定器，虚拟阻抗采用在多级配置的第二级中的接口转换器的输出滤波器。特别地，虚拟阻抗中的一个与滤波电容器串联连接，并且另一个连接在转换器的输出路径处。可以看出，通过使用所提出的稳定器，由CPL诱导的不稳定极点被迫移动到稳定区域。采用MATLAB/Simulink建立了含3台分布式发电机组的多级直流微网模型，验证了该方法的有效性。
In this paper, a converter-based dc microgrid is studied. By considering the impact of each component in dc microgrids on system stability, a multistage configuration is employed, which includes the source stage, interface converter stage between buses, and common load stage. In order to study the overall stability of the above dc microgrid with constant power loads (CPLs), a comprehensive small-signal model is derived by analyzing the interface converters in each stage. The instability issue induced by the CPLs is revealed by using the criteria of impedance matching. Meanwhile, virtual-impedance-based stabilizers are proposed in order to enhance the damping of dc microgrids with CPLs and guarantee the stable operation. Since droop control is commonly used to reach proper load power sharing in dc microgrids, its impact is taken into account when testing the proposed stabilizers. By using the proposed stabilizers, virtual impedances are employed in the output filters of the interface converters in the second stage of the multistage configuration. In particular, one of the virtual impedances is connected in series with the filter capacitor, and the other one is connected at the output path of the converter. It can be seen that by using the proposed stabilizers, the unstable poles induced by the CPLs are forced to move into the stable region. The proposed method is verified by the MATLAB/Simulink model of multistage dc microgrids with three distributed power generation units.
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影响因子：
7.7
作者：
Xiaonan Lu;K. Sun;J. Guerrero;J. Vasquez;Lipei Huang
通讯作者：
Xiaonan Lu;K. Sun;J. Guerrero;J. Vasquez;Lipei Huang
影响因子：
9.6
作者：
M. Cupelli;Lin Zhu;A. Monti
通讯作者：
M. Cupelli;Lin Zhu;A. Monti
DOI：
--
发表时间：
2002-04
期刊：
--
影响因子：
--
作者：
Robert Lasseter;A. Akhil;C. Marnay;John Stephens;J. Dagle;Ross Guttromson;A. S. Meliopoulous;R. Yinger;J. Eto
通讯作者：
Robert Lasseter;A. Akhil;C. Marnay;John Stephens;J. Dagle;Ross Guttromson;A. S. Meliopoulous;R. Yinger;J. Eto
DOI：
10.1109/ecce.2009.5316159
发表时间：
2009-11
期刊：
2009 IEEE Energy Conversion Congress and Exposition
影响因子：
--
作者：
Wook-Jin Lee;S. Sul
通讯作者：
Wook-Jin Lee;S. Sul
影响因子：
6.7
作者：
Tsai-Fu Wu;K. Sun;C. Kuo;Chih Chang
通讯作者：
Tsai-Fu Wu;K. Sun;C. Kuo;Chih Chang