微电网动态稳定性研究述评

在微电网内部,电力电子变换器接口型分布式电源广泛存在。电力电子接口微源与传统交流同步发电机在功率变换、控制策略和动态特性方面差异性较大,控制方法的多样性以及电力电子接口微源的高渗透率将给低惯量微电网的安全稳定运行带来严峻挑战。同时,多类型微源、多类型负荷在微电网内混合共存,可能引发源源耦合交互、负荷间交互以及源荷交互,不同特性的设备间相互作用将重新塑造区别于传统电力系统的动态响应特性,并诱发稳定性问题。首先对近年来国内外微电网稳定性的研究进行评述,归纳总结可再生能源渗透率不断提升下微电网典型运行特性和存在的动态稳定性问题;在微电网动态稳定性分类的基础上,分别从微电网动态稳定问题和微电网动态稳定分析方法两方面对微电网稳定性的研究动态进行分析、评价和探讨;最后,预测和探讨了微电网稳定性研究的发展趋势。

Review on Dynamic Stability Research of Microgrid

Power-electronic-converter (PEC) based distributed generations (DGs) are widespread in microgrids. This kind of DGs differs significantly from the conventional synchronous generators in control schemes and dynamic characteristics. The diversity of DG control methods and the increasing penetration of PEC DGs are leading to various challenges in stable operation of low-inertia microgrids. Moreover, the coexistence of heterogeneous microsources and loads within the microgrid may result in interactions among the DGs and loads. The couplings among the devices with different characteristics reshape the dynamic responses of the microgrids and induce stability issues. In this paper, firstly, typical operating characteristics and stability issues of the microgrids with increasing penetrations of renewable energy resources are summarized in detail. Based on the classification of the microgrid dynamic stability issues, state of the art in microgrid stability studies is reviewed and discussed comprehensively from the viewpoints of dynamic stability issues and methods of stability analysis.Finally, the trends for microgrid stability research are also presented.