颜湘武,王雨薇,郭玉威,贾焦心,刘正男.基于小信号模型的VSG并联系统惯量特性分析[J].电测与仪表,2019,56(17):19-25. Yan Xiang-wu,Wang Yu-wei,Guo Yu-wei,Jia Jiao-xin,Liu Zheng-nan.Inertia characteristic analysis of VSG’s parallel system based on the small signal model[J].Electrical Measurement & Instrumentation,2019,56(17):19-25.
Inertia characteristic analysis of VSG’s parallel system based on the small signal model
The virtual synchronous generator (VSG) technology is an effective method to solve the problem of decreasing system inertia and damping caused by increasing the permeability of new energy source with power electronic converter as the interface.But the parameters of the virtual rotational inertia, the core parameter, have been lack of the selection principle. Especially in the case of multiple parallel machines and more variable parameter control strategies, the improper selection of parameters can easily cause system oscillation. Take a two-machine system as an example,with the help of the high-order small signal model and its analysis method,the virtual rotary inertia is studied in detail. The selection principle of virtual moment of inertia for inverter with synchronous generator characteristics is proposed.which selects the parameters according to the stability threshold and system operation requirements.It can improve the stability performance of the system, and the correctness of the analysis is verified by simulation and experiment.