Coordinate Control of DC-module-based Building Integrated Photovoltaic System

DC-module-based building integrated photovoltaic (BIPV) system, which has some advantages such as high energy conversion efficiency, good expandability and maintainability, consists of photovoltaic DC building module and centralized inverter, and is propitious to the building integrated application. However, the output power of every photovoltaic DC building module in the DC-module-based BIPV system is random and varies with illumination, temperature, et al. Furthermore, the parallel of many photovoltaic DC building modules ulteriorly increase the complexity of energy flow in the system. Consequently the coordinate control between the photovoltaic DC building modules and the centralized inverter is necessary to achieve energy balance and stability. Firstly the coordinate control hypostasis of the DC-module-based BIPV system was analyzed, and a coordinate control strategy based on constant of the DC bus voltage was proposed. Then the accurate dynamic model was built to analyze and design the coordinate controller, and a design method was presented. Finally the experimental results on a DC-module-based BIPV prototype verify the validity of the proposed coordinate control strategy.