Key Laboratory of Distributed Energy Storage and Microgrid of Hebei Province (North China Electric Power University), Baoding 071003, China
Large amount of distributed generators(DGs)connected to power grid will cause loss of grid inertia and damping as well as decrease of system stability. The virtual synchronous generator(VSG)has great application prospects in the friendly access of DGs and the improvement of power system stability. As the physical basis of virtual inertia, the configuration of energy storage unit could directly affect the performance and cost of the VSG. Based on the two basic functions of the VSG(i. e. inertia support and primary frequency regulation), this paper develops an output model of the energy storage unit in response to the grid frequency fluctuation. And a configuration method of energy storage unit based on component parameters and control parameters is proposed. Considering the droop coefficient, damping coefficient and inertia constant, the transient characteristics of the output for energy storage unit and its adjustment mechanism are studied. Furthermore, the mechanism of the control parameters affecting the power and capacity requirements of the energy storage unit is analyzed, and the most influential control parameters are identified. Finally, the correctness of the proposed method is verified by simulations and experiments.
ZHANG Bo, ZHANG Xiaolei, JIA Jiaoxin,et al.Configuration Method for Energy Storage Unit of Virtual Synchronous Generator Based on Requirements of Inertia Support and Primary Frequency Regulation[J].Automation of Electric Power Systems,2019,43(23):202-209.DOI:10.7500/AEPS20190405002Copy