微电网小扰动稳定性研究综述

doi:10.11985/2016.07.006

摘要/Abstract

摘要：

小扰动稳定性是微电网运行控制必须解决的关键问题。针对逆变型微电网的小扰动稳定性问题,现有的分析方法主要有基于状态空间模型的特征值分析法、基于阻抗建模的阻抗分析法以及基于分岔理论的非线性分析法。本文对这几种主要的分析方法进行了评述,分析比较了各自的优缺点。最后,针对如何提高微电网小扰动稳定性,分别从优化设计控制器参数、改进下垂控制方式和优化设计分层控制策略三方面对其进行了总结。

关键词: 微电网, 小扰动稳定性, 特征值分析, 阻抗分析, 分岔理论

Abstract:

Small signal stability is the key issue in the operation and control of a microgrid. For the small signal stability of an inverter-based microgrid, existing analysis methods mainly contain eigenvalue analysis using state-space models, impedance analysis based on impedance models and nonlinear analysis based on bifurcation theory. This paper reviews these analytical methods as well as their respective advantages and disadvantages. Finally, for the improvement of the small signal stability, this paper summarizes the research situation in terms of the optimization of controller parameters, the improvement of droop control and the optimized design of hierarchical control strategy.

Key words: Microgrid, small signal stability, eigenvalue analysis, impedance analysis, bifurcation theory

中图分类号:

TM615

王舒娅,苏建徽,杨向真,杜燕. 微电网小扰动稳定性研究综述[J]. 电气工程学报, 2016, 11(7): 39-45.

Shuya Wang,Jianhui Su,Xiangzhen Yang,Yan Du. A Review on the Small Signal Stability of Microgrid[J]. Journal of Electrical Engineering, 2016, 11(7): 39-45.

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分析方法	优点	缺点
特征值分析法	物理概念明确,原理简单;具有明确、严格的判据	准确的系统参数不易获取;高阶系统的建模与分析较复杂;系统结构或参数发生变化时,需要重新建模与分析,效率低
阻抗分析法	仅通过阻抗匹配关系即可判断系统的稳定性,分析效率高,阻抗值也可通过实验测量获取	三相系统的线性化较复杂;不平衡系统的建模较复杂
非线性分岔分析法	可分析稳定裕度的具体信息,可给出各DG的具体模态	建模过程较为复杂,目前研究局限于简单低阶系统