柔性接入微电网的小信号建模

doi:10.16180/j.cnki.issn1007-7820.2023.03.004

摘要/Abstract

摘要：

针对传统并网硬开关无法主动调节潮流的问题,利用背靠背变流器取代传统并网硬开关,对配电网与微电网进行柔性互联,便于二者之间的协调控制。为对系统进行稳定性分析,并考虑到不同规模的微网内分布式电源数量的不同,文中建立一种经背靠背变流器接入的含N个分布式电源的微网小信号状态空间模型框架。利用MATLAB对其进行特征值分析,确定了影响微电网稳定性和动态性能的关键参数。在PSCAD/EMTDC平台上搭建出基于下垂控制的微电网柔性并网运行模型,将建立的小信号模型与搭建的仿真模型结合,在多个工况下进行仿真,验证了建模、分析与结论的正确性。

关键词: 微电网, 配电网, 背靠背变流器, 小信号模型, 特征值分析, 下垂控制, 柔性互联, 系统稳定性

Abstract:

In view of the problem that the traditional PCC hard switch cannot actively adjust the power flow, the back-to-back converters are used to replace the traditional PCC hard switch to flexibly interconnect the distribution network and microgrid, so as to facilitate the coordinated control between them. In order to analyze the stability of the system and consider the different number of distributed generators in microgrid of different scales, a microgrid small signal state space model framework with N distributed generators connected through back-to-back converter is established. The eigenvalue analysis is carried out using MATLAB, and the key parameters affecting the stability and dynamic performance of microgrid are determined. Finally, a microgrid flexible grid connection operation model based on droop control is built on PSCAD / EMTDC platform. The established small signal model is combined with the built simulation model, and the simulation is carried out under multiple working conditions to verify the correctness of the modeling, analysis and conclusion.

Key words: microgrid, distribution network, back to back converter, small signal model, eigenvalue analysis, droop control, flexible interconnection, system stability

中图分类号:

TP273

卢红文,袁旭峰,陈瑞洁,李雨龙. 柔性接入微电网的小信号建模[J]. 电子科技, 2023, 36(3): 21-28.

LU Hongwen,YUAN Xufeng,CHEN Ruijie,LI Yulong. Small Signal Modeling of Flexible Interconnected Microgrid[J]. Electronic Science and Technology, 2023, 36(3): 21-28.

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