Strategy Of Source And Load Coordinated Dispatch Considering Time-of-use Tariff In Microgrid

With the continuous development of smart grid,the operation scheduling and demand response of microgrid system has become a hot research topic at home and abroad.In order to make full use of the characteristics of both sides of the source and the load,and to make them play a role in improving the economic reliability of the operation of the microgrid,this paper proposes a coordinated scheduling strategy of the source and the load of the microgrid based on the optimized time-sharing price,and uses the improved particle swarm optimization algorithm to solve the optimization model.To realize the coordinated operation of source and load,we need the support of theoretical basis.The mathematical models of micro-grid source and load sides are established,and the operation characteristics of distributed generation and flexible load are studied and analyzed.The micro-source side includes wind power generation,solar photovoltaic power generation,micro-gas turbine and energy storage unit.The load side includes interruptible load and transferable load.Emphasis is placed on electric vehicle and air conditioning load.Time-sharing tariff is very important for guiding users to use electricity,stimulating load "flexibility" and improving the economy of microgrid operation.Based on the fuzzy c-means algorithm,the three periods of peak and valley are reasonably divided according to the fuzzy membership degree of peak and valley.Based on the demand elasticity theory of electricity price and the mutual restriction among electricity price,electricity demand and power supply,a peak-valley time-ofuse price optimization model considering flexible load is proposed to reduce the peakvalley difference of load,reduce the peak value of load curve and improve customer satisfaction.The optimized peak-valley time-of-use price is obtained through numerical simulation,and the validity of the model is verified.In order to realize the coordinated operation of micro-grid source and load,a coordinated scheduling strategy of micro-grid source and load is proposed based on the optimized time-sharing tariff and considering the dispatching effect of both sides of source and load,aiming at minimizing the operation cost of micro-grid,minimizing the payment cost of electric vehicle owners and maximizing the satisfaction of users.Aiming at the complexity of multi-objective optimization problem,the improved optimization algorithm is used to solve the optimization model.The simulation results show that the optimization strategy can improve the enthusiasm of electric vehicle owners to participate in micro-grid scheduling,take into account the interests of both sides of source and load,and improve the economy and stability of micro-grid operation.