Optimal Configuration Of Distributed Generation For Rural Power Grid

China is a large agricultural country,there are many renewable energy in the vast rural areas,such as biogas,straw,solar energy,wind energy,water energy,but part of the energy development is less,resource utilization rate is low.In addition,due to the construction of new countryside,the power demand of rural network is becoming more and more diversified,and rural areas are located in remote areas.The construction of reliable and economic independent micro grid is an effective way to solve the problem of power consumption in rural areas,which can achieve local materials and local consumption.Therefore,this paper focuses on the optimal allocation of distributed energy in rural power grid,and discusses the effective utilization of distributed energy.According to the energy characteristics of rural areas,the basic principles,mathematical models and output characteristics of wind power generation,photovoltaic power generation,fuel cell power generation,small hydropower and biogas power generation are described.In addition,the characteristics of energy storage devices such as lead-acid battery,lithium-ion battery,flywheel energy storage and super capacitor were introduced,which laid a foundation for the follow-up study.A distributed power supply optimization configuration scheme considering wind power generation,photovoltaic power generation,biogas power generation and energy storage equipment is established.This scheme takes the fixed cost,operation and maintenance cost,fuel cost and other economic operation costs of the power supply as the objective function,instantaneous power balance,battery charge state and seasonal power shortage probability as the constraints,and considers the characteristics of rural power load.Based on genetic algorithm,the optimal configuration scheme of distributed power supply is obtained.In order to reduce the pollution caused by small coal-fired furnaces used for heating in rural areas in winter and realize the cascade utilization of thermal energy and electric energy,a micro grid system composed of wind turbine,photovoltaic unit,fuel cell,battery,waste heat boiler,thermal load and electric load is constructed.Taking the minimum operation cost of the micro grid as the objective function,particle swarm optimization algorithm is used The typical daily output curve of grid connected and isolated island is obtained.The results show that the operation cost in island state is higher than that in grid connected state,and that cogeneration can effectively reduce the power generation and operation cost.