A Study Of The Key Operation Technology Of The AC/DC Hybrid Microgrid

In recent years,with the increasing penetration of distributed energy and the maturity of power electronics technology,the AC/DC hybrid microgrid has become a hot research topic in the industry.However,the application and development of the AC/DC hybrid microgrid faces many problems,especially the coordinated control and energy management of multiple distributed generation,which brings great challenges to the safe and stable operation of the AC/DC hybrid microgrid.Distributed coordinated control strategy and energy management system,because of its high flexibility and robustness,is suitable for distributed power plug and play.In recent years,it has been widely concerned in the field of AC/DC hybrid microgrid operation control.On the basis of the theory of consensus algorithm,a coordinated control strategy and an energy management system for the AC/DC hybrid microgrid are proposed in this study.Firstly,the key technology of the AC/DC hybrid microgrid is introduced,and the research status of the AC/DC hybrid microgrid is described in a comprehensive and specific way.In order to solve the problem of stability and economy in its operation,a distributed consensus algorithm is presented and its mathematical model as well as design points is analyzed.Then,a coordinated control strategy adopting consensus algorithm for AC/DC hybrid microgrid is proposed.Finally,further considering the economic of AC/DC hybrid microgrid operation,an energy management system based on consensus algorithm is designed and two coordination processes for the tolerance of tie line capacity is added.The results show that the coordinated control strategy proposed in this paper can effectively maintain the stability of system voltage and frequency,and the energy management system established can manage the output of controllable units economically and safely.Thus,the operation level of the AC/DC hybrid microgrid has been suppled.