Research On Economic Operation Optimization Problem Of Microgrid

In the long history of human development and evolution,energy is the prerequisite for everything and plays a crucial role in the gross national product and social progress.Under the premise of energy shortage in the world,various renewable energies have drawn extensive attention.The advent of microgrids has provided a way for these renewables to integrate,using renewable energy sources as well as reducing the use of traditional fossil fuels and reducing pollutant emissions.In order to rationally use energy to improve the economy and environmental protection of microgrid operation,the economic optimization of microgrid has become an urgent problem to be solved.This paper first analyzes the micro grid structure and energy management system,then establishes the mathematical model of photovoltaic cells,wind turbines,the micro gas turbine cooling heating and power cogeneration system,fuel cell and battery,and discusses in detail the genetic algorithm and improved genetic algorithm.In the model,taking the environment and economy as the objective functions,the constraint conditions of each micro-source operating condition and the electric power balance of the microgrid are taken as constraints,and a multi-objective function optimization model is established.Finally,the simulation analysis is carried out in the MATLAB environment.Two control strategies are respectively simulated according to the different principles of "power-Load-based" and "heat-Load-based" in the operation of microgrid cogeneration system.Then,under the two strategies,the economic dispatch of different micro-sources in each period of microgrid is carried out.The optimization results under the two strategies are respectively analyzed to verify the reliability of the economic model established.Under the strategy of "heat-Load-based" the single-objective and multi-objective optimization of the micro-source output is calculated.The simulation results show that the multi-objective optimization can balance the economy and environmental protection of micro-grid operation.This will provide a meaningful reference for the economic optimization of operation and management of the tri-grid system for microgrids in the future.