LPPT Control of a Dual-Stage Grid Connected Multi-String Photovoltaic System

The objective of this paper is to implement the limited power point tracking (LPPT) control of a photovoltaic (PV) system with the multi-string configuration. Unlike the centralized or single-string configuration, the power sharing between different strings is an important concern for the multi-string configuration under the LPPT control. A suitable control scheme is developed to achieve the aforementioned power sharing. The methodology proposed is verified under both uniform irradiance and partial shading conditions.