The Research On Power Generation Forecasting Algorithm Of The Photovoltaic Component And The Optimization Of The Number Of Serial PV Module

Building Integrated Photovoltaic (hereinafter referred to as the BIPV) is a fusion of two things, building structure and photovoltaic systems in appearance and function. PV system output power not only can provide energy for the building, also can send more power to the grid. After urbanization, there is a shortage of energy, building large quantities, less land and other issues. Although the BIPV project size is small, but the number. It is not only to on-site power supplement, and solves the loss of long distance transmission of photovoltaic power station. BIPV power generation mode, with its "low cost, low power transmission and transformation cost and low space synthesis installation cost" advantages, has become a focus direction of the solar energy application in our country.Different from the light volt power station, the actual power of BIPV is under the dual effects of building structure and environmental factors. The actual power will be affected by the dual effects of building structure and environmental factors. If it cannot accurately predict its output cannot be scientifically system design, power grid scheduling, as well as investors return analysis. Therefore, accurate prediction of BIPV system capacity is the key to building photovoltaic application problems.This article based on the carrier of building information model, set up photovoltaic building information model. It get the location information of each piece of photovoltaic modules in BIPV system from the model. According to the solar radiation data all over the country provided by the national weather service, it can get every hour’s radiation data of each photovoltaic modules, and get different power generation efficiency based on the way of photovoltaic modules in series. In the end, it can calculate the BIPV system capacity.This paper establishes the calculation method of capacity suitable for BIPV buildings based on the main input parameters of azimuth Angle and tilt Angle of each component plate. The power generation of BIPV system generating capacity is accurate to every moment of every piece of PV modules. After correction for the connection, it accurately calculate the generation BIPV system. The article also prepared the software tool using this generating capacity of prediction methods which is suitable for BIPV. The software has data exchange module and data processing module, and could accurately calculate the each month and throughout the year generating capacity of BIPV system. And it can provide optimal installation of the PV module suitable for project to the PV system designers. Besides, it predicts the power generation capacity and optimizes the PV strings of BIPV systems according to the example of the development building in Guangzhou, Zhuhai.The proposed algorithm has greatly improved the deficiencies of the existing algorithms of BIPV, and give full consideration to the building structure due to each piece of plate caused by changes in radiation conditions, then calculate the hourly power output of PV modules per piece. Obviously, this method greatly reduces the error of generating capacity calculation of the existing BIPV forecasting tool, and provides a solution for accurate power generation prediction of BIPV system.