Abstract：Due to the low inertia characteristic of microgrid, its frequency is susceptible to load fluctuation and deviates from rated value. Thus, a strategy of secondary frequency regulation based on virtual synchronous generator is presented. Firstly, according to the analysis of the frequency regulation principle of power system, the secondary frequency regulation controller of VSG is introduced in active power-frequency control to realize the frequent deviation-free control. Additionally, VSGs that are involved in the secondary frequency regulation can achieve no difference frequency regulation by improving the secondary frequency regulation control link in microgrid. The whole process does not rely on the coordinated control of microgrid central controller. Meanwhile, the proposed strategy allows VSG to allocate load power according to its own rated capacity, and improves the economic operation capability of microgrid. Finally, the proposed control method is verified by simulations and experiments. The proposed method effectively improves the frequency and economic operation characteristic of the microgrid.
涂春鸣, 杨义, 兰征, 肖凡, 李元涛. 含多虚拟同步发电机的微电网二次调频策略[J]. 电工技术学报, 2018, 33(10): 2186-2195.
Tu Chunming, Yang Yi, Lan Zheng, Xiao Fan, Li Yuantao. Secondary Frequency Regulation Strategy in Microgrid Based on VSG. Transactions of China Electrotechnical Society, 2018, 33(10): 2186-2195.
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2018, Vol. 33 
