Step Up Gain Converter with fast MPPT control under moving partial shading for train rooftop PV-DC-µG

摘要

A Dual Port Step-up Gain Converter (DPSC) fed rooftop PV train DC microgrid is proposed for operation under moving partial shading conditions. The proposed isolated converter provides high voltage gain using multiplier cells and galvanic isolation and thereby enabling interfacing of PV panel directly with 380V DC rooftop train DC-microgrid (DC-μG). The interleaving of the input stage along with low stress operation of devices at input stage makes the converter highly efficient. The DPSC delivers power to the DC microgrid by interfacing the two PV panels, one at each port without circulating current to form an element of the DC-μG. The fast dynamics of the converter along with high control bandwidth under extreme moving partial / full shading conditions due to moving objects are discussed in the paper. A fast MPPT algorithm is also proposed which tracks the maximum power point under moving partial shading conditions very fast and accurately. The proposed converter and algorithm exhibits fast dynamics with robust and reliable operation. The comparative analysis between the proposed control algorithm and conventional MPPT (P&O) is also presented in the paper.