Research On Application Effect Of Distributed Photovoltaic System In Chongqing Area

In recent years,solar photovoltaic power generation as a renewable energy technology has been a great concern,China as a photovoltaic power generation emerging markets,the installed capacity has become the world's first for four years since 2013.Chongqing as a municipality as well as large cities in the southwest region,while it's accumulative total installed capacity is the last one among the provinces and cities,in the National Energy Board on the photovoltaic power generation statistics.Chongqing how to deal with this situation? What are the application of photovoltaic power generation system in Chongqing? Is it worth popularizing widely? How to promote it? These questions urgently need to be studied.In this paper,the impact of system power generation factors were analyzed theoretically through the establishment of photovoltaic power generation capacity calculation model.It is pointed out that the power generation capacity of PV system is mainly affected by the amount of solar irradiation,PV module conversion efficiency and system equipment operation efficiency.Then in-depth analysis which combined with the actual situation in Chongqing indicated that the solar irradiance has obvious seasonal differences,and the winter irradiation situation is not good;summer PV module temperature,installation form and ventilation effect will be the key test and analysis object.A small off-grid solar photovoltaic system test bed has been built on the third teaching building of Chongqing University.One year time period test has been taken on the basis of previous theoretical analysis.The analysis focused on the relationship of the system power generation and the PR value,the influence of the solar irradiance and the component temperature on the power generation,the numerical relationship between the ambient temperature,solar irradiance,component temperature and the component power,and the ventilation effect on components conversion efficiency.Then,the typical buildings in the rural areas of Chongqing were selected.After the preliminary design of the PV system,the PVsyst software was used to model the buildings and simulate the annual power generation capacity of the system.Based on the PV power generation policy of Chongqing area and the investment of existing PV system,the investment recovery period,energy recovery period and environmental benefit of PV system are calculated and analyzed to discuss its economic and environmental suitability.Finally,the practical application strategy of distributed PV system in Chongqing area is put forward from the aspects of operation and design and installation.In the aspect of operation,air cooling and water cooling are proposed.In the aspect of design and installation,the installation location is discussed from the perspectives of solar irradiation resources and installation conditions,and the installation distance is calculated.The suitable application location and installation distance of the distributed PV system are obtained.