Analysis and optimization of module integrated MPPT converter based residential PV system

This paper addresses the power loss issue results from mismatch case which is critical to improving overall efficiency of the residential PV system. In general, a dedicated DC-DC converter with an extra distributed MPPT (Max Power Point Tracking) algorithm, what is called a MIMC (Module Integrated MPPT Converter), is connected to each panel to reduce the mismatch impact. However, even by adopting the MIMCs, it is not always possible to guarantee all the panels working at their MPP operation points. In this paper, the characteristic of the MIMC based residential PV system is analyzed firstly. After that, the criteria for ensuring that all the MIMCs working on their MPPs are also derived. Then, an optimized MIMC system configuration is proposed to allow all the PV panels to work on its individual MPP (Max Power Point) regardless of the mismatch case. Finally, the simulation and experimental results validated the proposed system structure.