Research On Dynamic Optimal Dispatching Of Cogeneration Microgird

With the rapid development of global economy and technology,the problem of energy crisis has become increasingly prominent.Energy demand is increasing,but petroleum,coal and other fossil energy sources are gradually exhausted.Therefore,it will be a big problem for us to ensure energy demand while taking into account the rational use of non-renewable energy.The emergence of cogeneration microgrid technology weakens this contradiction and effectively solves this problem.Firstly,the power supply in the microgrid system of cogeneration of heat and power is distributed power,which has the advantages of low cost and no pollution,and is an important development direction of renewable energy generation technology.Secondly,cogeneration microgrid can not only provide energy,but also provide heat energy.The application of cogeneration microgrid technology in power system is of great significance to solve the problems of local power supply and heating.Aiming at minimizing the operation cost of the cogeneration microgrid system,this paper analyses the working status of each micropower source,and puts forward the optimal dispatching strategy to make the cogeneration microgrid system operate safely and steadily,while reducing the operation cost of the system.Firstly,the overall structure of the cogeneration microgrid system is constructed,and the output power models of wind turbines,photovoltaic cells,lithium-ion batteries and electric boilers are established respectively.Then,the optimal dispatching framework of cogeneration microgrid system is constructed,and the working status of each micropower source is analyzed,and the optimal dispatching strategy of the system is determined.Finally,the objective functions and constraints of short-term and ultra-short-term optimal dispatching for cogeneration microgrid system are modeled mathematically,and then the objective functions are solved to obtain the optimal dispatching result.In order to verify the feasibility of the optimized scheduling strategy for cogeneration microgrid proposed in this paper,an example analysis is carried out.Under the MATLAB platform,the Yalmip toolbox is used to call the Cplex solver to solve the objective function,and the short-term scheduling results and ultra-short-term scheduling results are obtained respectively.The results show that the system achieves the energy supply and demand balance and runs at the minimum economic cost,which verifies the proposed.The optimized scheduling strategy for cogeneration microgrid is reasonable and effective.