Research On Evaluation System Of Building Integration Photovoltaic System

The world's energy crisis is becoming more and more serious.The large-scale development and utilization of fossil energy has caused natural environmental pollution and the deterioration of human living environment.Finding new energy sources has become a hot issue in the world.Among all kinds of renewable energy sources,solar energy technology has received extensive attention from the world's countries due to its large reserves and pollution-free.The use of photovoltaic technology in buildings is one of the important ways for humans to use solar energy.The research on BIPV comprehensive evaluation system is of great significance for the rational development and utilization of solar energy resources.Based on the research and analysis of the domestic and international green building evaluation system and the composition,classification,application form and system performance influencing factors of BIPV system,the basic attributes and characteristics of the evaluation object are clarified.Therefore,the BIPV evaluation index system has been established from five aspects: integration of photovoltaic system and building,power generation performance,economic performance,safety and durability,operation and maintenance.Among them,the integration of photovoltaic system and building includes the overall planning,the combination of photovoltaic components and buildings,structural requirements and electrical requirements;power generation performance includes photoelectric conversion efficiency,transmission efficiency,power generation and power quality;economic performance includes the proportion of building photovoltaic electricity,payback period and photovoltaic system footprint;safety and durability can include lightning protection and grounding,equipment quality and equipment installation;operation and maintenance includes maintenance and repair,system monitoring,system cleaning and staff management level.Secondly,the Delphi method and the AHP method are combined to calculate the weight of each indicator.In order to increase the credibility of the survey results,experts and technicians in the field of 30 solar photovoltaic technologies were investigated.Through the calculation and analysis of the survey results,it is found that there are significant differences between the three questionnaires and other survey results,so let them go.Therefore,a total of 27 valid questionnaires were collected in this survey.Through the construction of the hierarchical structure and judgment matrix,all the survey results are tested and calculated by MATLAB,and the relative weight and final weight of each evaluation index are obtained.Then,according to the quantity of indicators and the characteristics of the index system,the combination of analytic hierarchy process and grey comprehensive evaluation method is used to establish a gray multi-level comprehensive evaluation system of BIPV.Meanwhile,the method,grade division,evaluation criteria and quantitative treatment of qualitative indicators were determined.Finally,using this comprehensive evaluation system to evaluate a BIPV system in Beijing,the results show that the actual comprehensive performance of the system is the second level(good),which verifies the scientific,rational and operability of the evaluation system.The BIPV gray multi-level comprehensive evaluation system provides a theoretical basis for the application and promotion of solar photovoltaic systems in buildings.