Distributed Voltage/Frequency Hierarchical Control for AC/DC Hybrid Microgrid Considering Economic Dispatch
AC-DC hybrid microgrid(MG)can integrate distributed generation(DG)and distributed load on either the AC or DC side of the microgrid,thereby eliminating many unnecessary energy conversion devices while enhancing flexibility and efficiency.However,due to the complex structure of AC/DC hybrid microgrid,it is challenging to realize its stability and economical operation.Therefore,this paper proposes a new distributed hierarchical control strategy to improve the economic operation of hybrid AC-DC microgrid.First,for the primary control,the droop control method is proposed to realize the real-time power distribution among AC-DGs,DC-DGs and interlinking converters(ICs).By distributing the unbalanced disturbance power among the DGs in real time and using the IC to realize the power mutual aid for the hybrid AC-DC microgrid,the system voltage and frequency stability can be improved.Then,for the secondary control,the corresponding distributed control strategy is designed to regulate the voltage and frequency of the AC-DC hybrid MG to their nominal values while achieving the economic scheduling within and between AC-DC microgrid subsystems at small time scale,which improves the system operation economy.In addition,the stability of the designed distributed control strategy is analyzed by using the Lyapunov method.Finally,the effectiveness of the proposed control strategy is verified by real-time simulation on the StarSim hardware-in-the-loop platform.
万方数据
维普
