The virtual synchronous generator(VSG)control,based on droop control,introduces the rotational inertia and damping coefficient of synchronous generators,improving the dynamic frequency response characteristics of the system,and enhancing the disturbance rejection capability of the AC-DC hybrid microgrid.However,it ignores certain dynamic adjustment performance.In response to this issue,this article proposes a VSG interface converter parameter fuzzy adaptive control strategy.This strategy can reduce the overshoot of the system during oscillation and further improve the dynamic adjustment performance of the system in the face of disturbance,and is more flexible.Firstly,based on the instantaneous power balance relationship of the AC-DC hybrid microgrid,the VSG control strategy of the interface converter is proposed.Secondly,the small-signal model of the entire closed-loop control system is established,and the influence of key parameters on the stability of the system is analyzed.Then,based on fuzzy control,an adaptive control strategy for virtual inertia and virtual capacitance is designed.Finally,the feasibility and superiority of the proposed control strategy are verified through experiments.
关键词
交直流混合微电网/接口变换器/虚拟同步发电机/模糊自适应控制/小信号模型
Key words
AC-DC hybrid microgrid/interface converter/virtual synchronous generator/fuzzy adaptive control/small signal mode
维普
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