Advanced Analysis of Shading Effect Using Minutely Based Measured Data for PV Systems

摘要

Output power loss due to shading effect is one of the concerns for roof mounted residential PV systems. Because of the roof design, PV modules are not always installed on a simple gable roof but also installed on a complex hipped roof. Hipped roof sometimes makes a shadow on itself and this shadow will reduce the energy yield of the PV systems. Other causes of the shading are buildings, trees or poles and transformers of the power grid especially in urban area. This research developed a method to evaluate the shading effect using minutely based measured data. This method can determine the direction of light-blocking object without taking a picture of object or the location survey. Quantitative analysis of output energy loss is also performed.