Research On Chaohu 20 MW Photovoltaic Power Generation System And The Design Of Output Lines

Solar energy is a green renewable energy,and photovoltaic power generation is one of the effective ways to utilize solar energy.In this paper,the capacity of 20 MW photovoltaic power station is designed based on the Chaohu photovoltaic power generation project,and the main work content can be divided into two modules: One is the analysis and design of solar photovoltaic power generation system;The other is the scheme design of power line path and the model selection design of its related components,etc.Firstly,the photovoltaic power generation system design has been carried out.The working principle of solar panels is illustrated by an example;The influence of temperature and irradiance on I-U characteristic curve has been analyzed by using the analytic formula and the studies show that,in the case of constant irradiance,output current of solar panels decreases with the decrease of environment temperature,but both the output voltage and maximum output power are become bigger;In the case of constant temperature,the output current,voltage and maximum output power of solar panels are all become smaller with the decrease of the irradiance;The calculation method for the azimuth angle and optimal dip angle of fixed bracket are given,in adition,the model selection design of grid inverter has been completed.Secondly,the power line and its component selection design have also been carried out.According to the engineering construction scale and the present situation on both ends of the power line,the expansion plan has been put forward by using of standby interval of 2# main transformer of Huaiguang transformer substation;For the question of the newly building power lines across villages and existing power lines,the scheme design of avoiding the villages and passing through the exsisting power lines have been proposed;On the base of meteorological characteristics,the protection design of the anti-thunder and earthing system has also been proposed;Comparing the characteristics of the five kinds of cable,crosslinking polyethylene cable with more excellent performance is ultimately to be selected,in aditon,both the calculation design of the cable current and model selection design of cable accessories are presented.