构网型储能支撑的新能源孤岛微电网静态电压稳定性分析OA

Islanded microgrids in 100％new energy scenarios lack synchronous machine power support and face voltage stability challenges.This paper proposes a method to directly calculate static voltage stability critical points and stability boundary with new energy islanded microgrids supported by grid-forming(GFM)energy storage.It defines the stability margin index in high-dimensional scenarios with multivariate changes.Firstly,this study considers two types of static voltage instability in islanded microgrids:saddle node bifurcation and limit induced bifurcation caused by energy storage power constraints,and establishes computational models for both critical points by the direct method.Then,the neighboring critical points are computed directly by using the known critical points as initial values,yielding the high-dimensional static voltage stability boundary with load and new energy power change simultaneously.The stability margin index in traditional one-dimensional scenarios is extended to high-dimensional scenarios.Additionally,the static voltage stability margin index with multivariate changes is defined,and the calculation procedure of the stability margin considering the storage power constraint is given.Finally,the accuracy and efficiency of the proposed indicators and methods are verified in the IEEE 33-bus system,and the effect on static voltage stability of capacity,installation locations of the GFM energy storage,and different GFM control strategies are further analyzed with example data.