Study On Design And Optimization Of Rural Distributed Photovoltaic Power Station

Distributed photovoltaic power generation system means the photovoltaic power generation system of small size modularization in hundreds of watts to billions of watts,distributed,near the users,high-efficient,and reliable.At present,with the increasingly reducing land sources,it has important significance on relieving the peak load,energy conservation and emission reduction,and protection on the environment by fully use of the idle roof resources in the city and rural areas for the construction Targeted Poverty Alleviation of distributed photovoltaic power generation system When the distributed photovoltaic power generation system is development in high speed,there are also problems of low generation capacity caused by wrong selection of address,frequent malfunction caused by improper type of the equipment,and also the safety loopholes caused of unsuitable installation and deign,so that the research on the reasonable design and installation and the selection on the type of equipment of distributed photovoltaic power generation system has important significance of value In this paper,it takes the distributed photovoltaic power generation station in a rural area in Xian as research object,and the main research contents are as follow(1)Analysis and research on the construction site of distributed photovoltaic power station.According to the design requirement of the distributed photovoltaic power station,the constructable site and form of distributed photovoltaic power station were discussed,and the selection factors,advantages and disadvantages of site of the distributed photovoltaic power station in rural area were studied.The influence of site and climate on the distributed photovoltaic power station and the installation mode of distributed photovoltaic power station with different roofs were analyzed.Five latitudes from south to north in China were selected to study the influence of installation inclination angle,azimuth angle and power generation of photovoltaic modules.(2)Cost-benefit analysis of distributed photovoltaic power stations.Through comprehensive analysis of various influencing factors of the cost of distributed photovoltaic power station,the cost evaluation system of distributed photovoltaic power station,including equipment and installation cost,construction cost and other cost,was established,and the scoring rules of comprehensive evaluation index were established according to the project experience.The cost-benefit,economic benefit,energy saving,emission reduction and operation performance of tiling installation and optimal inclination installation of distributed power station were studied comprehensively.(3)Technical research of MPPT for maximum power point tracking.The influencing factors and algorithm principle of MPPT were analyzed.MPPT algorithm based on fixed step length,MPPT algorithm based on particle swarm optimization(PSO),MPPT algorithm based on artificial neural network were studied and the the simulation experiments were carried out.The experimental results show that the artificial neural network can better predict the output voltage,achieving more efficient control.(4)Design and performance comparison of distributed power station.First,the design of two 2MWp distributed photovoltaic power stations in Xi 'an was completed,including the site selection of the power station,the selection of inverters,the installation angle and azimuth angle of photovoltaic modules,and the design of installation mode.The operation mode of the power station,module arrangement,spacing calculation,wiring,gas access system,ac and dc system were designed.Based on PVsyst system,the system efficiency and power generation of these two power stations are simulated.The results show that,when the available area of the roof is the same,The installed capacity of photovoltaic modules installed in the installation mode with the best inclination angle is 20.83%lower than that in the installation mode with the tiling at south slope+the fixed support 30 at north slope,and the efficiency of the power station system is basically the same;The power station installed at the optimum Angle of inclination has a 25-year average reduction of 17.97%.However,the annual average number of hours utilized increased by 4.30%,thus making each photovoltaic module more efficient.