Optimal Sizing For Capacity Of Distributed Generation And Energy Storage System In Standalone Microgrid

As a small-scale power distribution system capable of effectively integrating various distributed power sources,the microgrid can effectively and rationally utilize clean energy such as solar energy and wind energy,and is one of the important means to cope with the increasingly serious environmental pressure and energy crisis.It is necessary to study the capacity optimization planning problem of distributed power sources and energy storage devices in microgrids.Firstly,an island independent microgrid is token as the research object,its working principle and operation characteristics of wind turbine,diesel generator,photovoltaic cell array and energy storage device in the microgrid are studied,and the wind speed-output power model of wind turbine,the fuel consumption-output power model of the diesel generator,photovoltaic cell illumination intensity-output power model considering the temperature-affected and the KiBam model of the battery are established.The models describes the power characteristics of the distributed power supply and the energy storage device.Secondly,in view of the problem that the calculation model of battery life in the research of distributed power capacity optimization is not detailed enough,the calculation model of battery life considering the influence of battery discharge depth and discharge speed is studied.Based on this,a optimal scheduling model of battery with the lowest life-loss cost is the target is established.The comparison and analysis of the battery in the two grids under the two modes of "optimized scheduling" and"equivalent to one power dispatch" in the micro-grid are compared.The difference in lifespan proves that "optimized scheduling separately" can improve the service life of the battery,thereby reducing the replacement cost of the battery,and thus affecting the capacity configuration scheme of the microgrid power supply.Finally,the distributed power capacity optimization model is established with the lowest cost present value in the whole life cycle.The replacement cost of the battery is calculated more accurately by nesting the refined model of the battery life in the optimization planning model.The genetic algorithm is applied to solve the problem of an island independent microgrid.The feasibility and correctness of the model and the algorithm are verified.