Virtual synchronous generator(VSG)control algorithm can provide inertia for the grid and assistance for volt-age and frequency regulation.However,when the grid encounters voltage imbalance,it will lead to the inequilibrium of grid-connected current and the fluctuation of active and reactive power,which seriously affects the quality of grid-connect-ed power.To solve this problem,this paper proposes a model predictive control method for virtual synchronous generator under grid voltage imbalance.The proposed control method uses a strategy based on fast voltage vector selection to control the reconstructed positive and negative sequence current components,so as to achieve the control objectives of constant ac-tive power,constant reactive power and current equilibrium.In addition,the regulation coefficient of negative sequence current is introduced,thereby realizing coordinated control of these three objectives.
关键词
虚拟同步发电机/不平衡电网电压/模型预测控制/功率波动抑制/负序电流
Key words
VSG/grid voltage imbalance/model predictive control/power fluctuation suppression/negative sequence current
维普
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