| The proportion of China’s building energy consumption accounted for total energy consumption is high,and building energy efficiency task is critical.The combination of photovoltaic and building is an effective measure for building energy efficiency.Although Ningxia region’s ecological environment is relatively fragile,and the environmental improvement has a lot of pressure,geographical conditions and natural conditions are suitable for the development of photovoltaic industry.Facing the reality that the development and application of Ningxia urban commercial building photovoltaic power generation system are not as well the field of photovoltaic power plants and agricultural photovoltaic greenhouse,the photovoltaic power generation systems for urban commercial buildings are designed in the region.Firstly,the application status of ground photovoltaic power generation system and building photovoltaic power generation system in Ningxia area are studied.This paper puts forward the necessity of the development of urban commercial buildings in Ningxia and the design principles of urban building roof photovoltaic power generation system,and the characteristics of the solar panels curves are measured actually at different light intensities,different temperatures,different tilt angles,different seasons,and tandem and parallel conditions.It lays the foundation for the design of photovoltaic systems.Then,based on the design principles of urban building roof photovoltaic power generation system,the Yinchuan shopping mall roof photovoltaic power generation system is designed.The design includes the design of the PV array inclination,wiring scheme,DC and AC confluence box,DC lightning protection cabinet,meter,monitoring system,inverter and system cabling design.And for the solar radiation characteristics of Ningxia,the PV square of the mall roof photovoltaic system is made a specific time and a specific tilt of the improvement based on photovoltaic design software.The simulation of the designed system is carried out.Finally,the comprehensive benefit index evaluation system of photovoltaic power generation system is established.The economic and environmental benefits are modeled,and three indicators of economic benefits are proposed,such as net present value,payback period and internal rate of return.Comprehensive benefits of the mall roof photovoltaic power generation system are analyzed.The results show that the Ningxia area has the necessity and feasibility of developing the roof PV of the shopping mall.After a series of adjustments,the power generation has been improved significantly.The combination of shopping malls and photovoltaic can obtain the best economic benefits in many buildings. |
