Optimal Capacity Allocation Of Stand-alone New Energy Hybrid Power System

Nowerdays, many islands and mountainous areas and other places away from thegrid, while these places usually have much solar and wind resources, in these placesbuilding hybrid power system is the best way to address the problem of electricity.Aiming at this problem, this paper attempts to adopt a genetic algorithm to studyoptimization design on stand-alone new energy hybrid power system, based on a seriesof documents and data concerning optimization design of this field as well as theweather condition (light radiation, ambient temperature, wind speed, etc.) and assumedpower load in Dong’ao Island. The main researches are as follows:The paper firstly give an integrated design for the stand-alone new energy hybridpower system in accordance with the geographical and weather conditions at theproject location, and introduced in detail the functions of the composition of thesystem. Then the mathematical models of the main components of the hybrid powersystem is established, including capacity model of wind turbine generator system(WTGS), capacity model of photovoltaic array, model of batteries in charging state,fuel cost model of diesel generator set and conversion efficiency model of inverter.Secondly，Detailed prescription is given on the computing method about PVpanels tilted surface of the light radiation and the wind turbine rotor at the wind speedassessment model wind-speed model. The article first describes the Earth with respectto the geographical parameters of the sun and photovoltaic panels installed inclination,then three steps describe the tilt of the method of calculation of the surface lightradiation. Island wind energy resource assessment using the weibull distribution, thearticle describes in detail the calculation of weibull parameters. Finally, HOMERsoftware, enter the monthly average optical radiation data and monthly average windspeed of weibull distribution parameters obtained after8760hours a year of discreteradiation data and wind speed data.Finally, this paper, taking the minimum operating cost of a power system as thetarget function of the optimization design and comprehensively considering theinfluence of the power distribution reliability and pollutant on environment, attemptsto establish an optimization model of the Wind-Solar-Diesel-Battery hybrid powersystem based on genetic algorithm and system operation control strategies, and make asimulation of hourly running condition of the system in one year through programmingin MATLAB. Conclusion is made according to the simulation that the optimized allocation can achieve lower operating cost, higher power distribution reliability andless pollutant emission of the hybrid system compared with the diesel power system inthe island. To further verify the feasibility of the simulation results of the geneticalgorithm, based on the HOMER software independent new energy hybrid powersystem simulation, and simulation results carried out a detailed analysis.