Research On Modeling And Controlling Of Microgrid With Fuel Cell And Photovoltaic Cell

With the development of distributed generation technology, the traditionalgrid-tied control mode restricted the effective use of distributed generation, theemergence of microgrid technology，greatly improving the utilization of distributedgeneration, so it has great significance in studying the microgrid operation controlmethod. This paper analyses the components and characteristics of the micro-grid,and then study the types and characteristics of the fuel cell. On the basis of analyzingand studying the Solid Oxide Fuel Cell (SOFC) mathematical model, the SOFCsimulation model on fixed fuel utilization is built, then simulates and analyses thepower generation characteristics. Study the principle and power feature ofphotovoltaic cells and built photovoltaic cell simulation model based on Engineeringmathematics model；analyzed common photovoltaic maximum power point trackingalgorithms and adopt Perturbation and Observation method to simulate photovoltaicmaximum power point tracking，we can see the model has good dynamic performanceand environmental adaptability. In this paper，the microgrid adopts the control strategywhich combine PQ and V/F control; PQ、V/F control module was constructed to builda microgrid simulation model containing fuel cell and photovoltaic cell. Microgrid inGrid-Connected state，fuel cell and photovoltaic cell both adopt PQ control; Inisolated state, photovoltaic cell keep PQ control but fuel cell changes to V/Fcontrol.In the simulation,we study the microgrid feed voltage、frequency and outputpower of each micro-source. Analysis and simulation curve derived the micro-grid ingrid-connected and isolated operation can reach steady state timely after short-termfluctuations, so the correctness of the control strategy is validated. Through microgridsimulation in switching between grid–connected and isolated state to further verifythe reliability of the control method.