| Nowadays,with the rapid growth of economy consuming more energy and protecting environment are two problems that all countries in the world should face,the development and utilization of clean energy has become the trend of energy development.Therefore the inexhaustible solar energy is undoubtedly the ideal green energy to meet the sustainable development strategy.The distributed photovoltaic power station characterized by proximity to the user can not only meet the rapidly increasing electricity demand in eastern China,but also solve the problem of centralized power supply in remote areas.In this paper,took the case of a 160.16 kWp photovoltaic shed project in Xingtai city as an example,the design,optimization and simulation of the system plan were carried out and also evaluated the feasibility of the project,the specific work was as follows:(1)Meteonorm7 is closer to ground observed value than NASA's radiation data in areas where atmospheric quality is normal.According to Meteonom7 the global annual radiation in Xingtai was 1374kWh/m2·a belonging to the rich solar energy zone,and The local weather conditions are appropriate,a comprehensive analysis concludes that the project is suitable for the construction of photovoltaic power plants.(2)The photovoltaic shed is mainly composed of PV modules,inverters and grid-connected equipment.Combined with the type of components,specifications and market conditions,the project selected 260 Wp polysilicon double glass module.The comparison of design methods between the centralized and the group series inverter shows that although the initial investment of group series inverter scheme is slightly higher,but the generating capacity is higher,so select the group series inverter of 33 kW.(3)Tracking system can significantly increase generating capacity,but the area covered and the initial investment require more,after a comprehensive analysis concluding that the fixed installation of the array is more suitable for the operation of the photovoltaic shed.In order to reduce the computational complexity,this paper has developed the calculation program of array spacing.In Xingtai,when the array towards the south,the best angle is 33 degrees.The increase of dip angle can improve the utilization ratio of the PV modules,but the land utilization rate is reduced.And the results of comparison show that "the economic dip angle" is 20 degrees.In order to simplify the construction and drainage,the shed is toward the East,and the angle is 5 degrees.After calculation,one string is made up of 22 PV modules,and there are two ways to access to the inverter,the parallel of the 5 series and the parallel of the 6 series both without MPPT loss,finally determine the electrical main wiring scheme of the system.(4)By PVsyst simulation,the average annual generating capacity of the photovoltaic shed is 169,800 million kWh,the power generation of life cycle is 509.54 million kWh,the total efficiency of the system is 87% which result in great advantages of energy saving and emission reduction.The initial investment of the project is 1.2 million yuan.According to all kinds of online modes,the investment payback period is between 6.5 and 8 years,the annualised return is 12.015%.The higher the proportion of private use is,the shorter the payback period is,and the income becomes higher.The solar carport project is feasible. |
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