Investigation on Transient Stability of Multiple Microgrid Clusters based on Virtual Synchronous Generator Control Strategy

Abstract

The construction of multiple microgrid clusters (MMGCs) contributes to incorporating increasing distributed energy generations flexibly, supplying local power loads conveniently, and decreasing operating losses appreciatively. To promote the progress of the MMGCs further, research on the transient stability of the MMGCs based on the virtual synchronous generator (VSG) control strategy is done in this paper. Firstly, through introducing the P-ω and Q-V control of the synchronous generator (SG), the theoretical modeling of the VSG control strategy is conducted, which is implemented on the MMGCs. Then, using the Lyapunov direct method, the shrinking admittance matrix model and the rotor motion equation of the MMGCs are established. Therewith, the transient energy function of the MMGCs in the center of the inertia frame is derived. In light of the MATLAB environment, a detailed electromagnetic transient model of the MMGCs with three MGs based on the VSG control is created, and the simulations are carried out to check the suitability of the presented energy function model and the stability analysis method. In the simulations, the effects of the fault clearance time, size of inertia, and voltage droop coefficient on the power angle stability of the MMGCs are quantitatively assessed. The theoretical analysis is well following the simulation findings to determine the efficacy of the proposed approach.