Research On Optimal Scheduling Of Cogeneration For Independent Microgrid

Wind energy and solar energy have great potential for development because of their abundant reserves,green and pollution-free characteristics.Microgrid can effectively solve the problem of distributed access to distributed power supply,can give full play to the unique advantages of distributed generation,to overcome the adverse effects of wind power and photovoltaic power generation such as stochastic volatility,improve the efficiency of utilization of renewable energy.Because independent microgrids do not have the support of large grids,the ability to withstand the stochastic variability of renewable energy sources is weak.Because of the simultaneous heating and power supply,the combined heat and power microgrid increases the complexity of system scheduling.Therefore,the reasonable dispatch of the cogeneration microgrid can reduce the impact of wind energy and solar power generation,enhance the reliability of the system,reduce the cost of microgrid and achieve economic operation.The main contents of this paper are as follows:First of all,the analysis of independent micro grid cogeneration system structure,discusses the wind power generation,photovoltaic power generation,energy storage battery and a micro gas turbine and electric boiler working principle,and establishes the output power of their models,provides a theoretical basis for the micro grid cogeneration scheduling strategy.Secondly,the overall scheduling framework of cogeneration is established,the operation state of micropower supply is analyzed,and the corresponding optimal dispatching strategies are proposed.Once again,the economic scheduling model of micro grid cogeneration optimization scheduling,the objective function considering fuel cost of each micro power operation and maintenance costs,depreciation costs,loss of micro gas turbine and electric boiler operation when starting and stopping costs and other factors,including the constraints of each micro power output,ramp rate,micro gas turbine the battery state of charge and capacity balance constraint.A scheduling model for cogeneration system of independent microgrid by using dynamic programming algorithm.Finally,in order to verify the feasibility of the proposed algorithm,a case study is carried out to verify the feasibility of the proposed algorithm.Under MATLAB programming dynamic programming algorithm to optimize the scheduling model.The optimization results show that the microgrid can meet the requirements of thermal load,achieve energy balance and achieve the goal of economic operation.Therefore,the optimal scheduling strategy proposed in this paper can realize the economic operation of the cogeneration.