Mitigation of Cross Coupling Effects in Series Configuration of PV D-MPPT Architecture with SEPIC Converter

Photo-Voltaic systems consisting of long strings are prone to shading effects which result in a decrease in the total power output of the system. The promising solution to this problem is Distributed Maximum Power Point Tracking (D-MPPT) technique where each Photo Voltaic unit is attached to its respective DC-DC converter. Generally, there are two types of D-MPPT architectures: Parallel for high current and series for high voltage applications. There have been some exceptions in the system when the units are joined in series under situations of partial shade. Cross Coupling Effects (CCE) is a term used to describe such exceptions. The coupling effects have been seen with the use of a boost converter. When it is replaced by a SEPIC converter CCE is eliminated, and optimum use of the system can be seen.