Study On Optimum Design Of Photovoltaic Power Station In Complex Terrain

As a kind of efficient and clean renewable energy power generation technology,photovoltaic power generation become one of the fastest developing new type of power industry in recent years.With the increase of the capacity of photovoltaic power plants,mountainous areas have gradually become an important land for power station.For photovoltaic power station on mountainous area,installation parameters of fixed photovoltaic modules on non-south-facing slope are often the same with south-facing slope's,which cannot achieve the full utilization of photovoltaic resources.On the complex terrain,the performance of the photovoltaic module is not only related to their tilt angle and azimuth angle,but also depend on latitude and solar radiation characteristics at that particular terrain.In order to develop solar resources on non-south-facing slope,a solar radiation model for photovoltaic modules installed in mountain slope is established,and an novel influence analysis method for self and cast shadows produced by the orography is designed.Moreover,an optimal calculating method of photovoltaic modules installing tilt and orientation angles is proposed.In this paper,the detection of self and cast shadows produced by the orography are addressed and the shadows effects by modules mutual shading on surfaces have been studied because of their importance when estimating solar radiation.First,establish the space model between the PV modules,the slope and the sunlight in the complex terrain.Considering the influence of these shadows,the solar irradiance calculation model of the fixed PV module on complex terrain was established.A method of setting angle range circulation exhaustive optimization way to get the optimum tilt and azimuth angle is proposed.The tilt angles and azimuth angles of the modules are in 1 ° interval.By calculating the average amount of radiation of the modules,the optimal tilt angles and azimuth angles of the modules are obtained.In this paper,the distances between the components on the horizontal ground,the north-south gradient,the north-south,the east-west gradient and the shady slope on the mountain are analyzed and calculated.Taking a northwest region as an example,the optimal tilt angle and direction angle of the components on different non-south-facing slope surfaces and the corresponding maximum radiation are calculated,which are compared with those of the module located south-facing.PVSYST,a professional photovoltaic design software,was used to verify the correctness of the irradiance calculation model and optimization design method proposed in this paper.