Study On Optimal Capacity Allocation And Economic Operation Of Microgrid In A Coal Mine In Huainan Mining Area

In recent years,the profits of coal enterprises are generally declining,and reducing the cost has become an important goal of coal enterprises.A coal mine in huainan mining area has the characteristics of large electricity consumption,relatively stable electricity load,perfect grid structure and idle collapsed ground land,and the coal bed methane(commonly known as "gas”)content of the coal mine is high,a large amount of emission,is a high gas mine,with the basic conditions of coal bed methane power generation.The construction of microgrid in this coal mine combined with the coal-bed methane power generation technology can make full use of land resources,improve the efficiency of coal mine system and energy utilization rate to a certain extent,and turn waste into treasure to ensure coal mine production safety,reduce greenhouse gas emissions,fully tap the energy value and promote economic and social development.Therefore,it is of great practical significance to study the optimal allocation and economic dispatch of microgrid power supply capacity for a coal mine in huainan mining area.In this thesis,the working principles of wind turbine,photovoltaic array,coal-bed methane internal combustion engine and energy storage device in the microgrid are analyzed,and the output power models of various power sources are established.Secondly,taking the annual comprehensive net benefit of coal mine microgrid as the objective function,and taking the cost,income and various constraints into consideration,the optimal capacity allocation model of coal mine microgrid with coal bed gas power generation is established.According to the power and load data of wind turbines and photovoltaic cells throughout the year,particle swarm optimization(pso)algorithm is used to solve the optimal capacity allocation model,and the influence of different operation indexes such as renewable energy proportion and self-utilization rate on the configuration results is analyzed.On the basis of the optimal allocation of capacity,in view of coal mine in the microgrid four kinds of load modeling,flexibility and flexibility load scheduling method is proposed,developed and time-sharing electricity price is inversely proportional to the flexibility of the load the target curve,select the flexibility of the load quantity each time as the optimization variables,using particle swarm optimization algorithm to calculate the flexibility of the optimized load distribution.The optimized load curve is substituted into the operation planning program of the microgrid,and the optimal working condition of the battery and the interaction between the electric energy are obtained.