A modified current sensorless approach for maximum power point tracking of partially shaded photovoltaic systems
Document Type
Article
Publication Date
1-15-2023
Abstract
The present paper proposes a modified current sensorless approach to reduce the implementation cost of maximum power point tracking (MPPT) controller for photovoltaic (PV) systems under partial shading condi-tions (PSCs). The proposed scheme relies only on the input voltage signal without the need for a current sensor to track the global maximum power point (GMPP). This is performed using a predefined objective function derived from the mathematical model of the buck-boost converter with an adaptive step-size mechanism for quick convergence. In addition, a formula of lower and upper limit duty cycle values for every local peak is incor-porated for fast detection of local power peaks. An extensive experimental study, using a hardware prototype composed of a buck-boost converter driven by a dSPACE DS1104, is carried out to validate the proposed control scheme. Experimental results show that the proposed controller is able to accurately track the GMPP with high speed under various PSCs scenarios. Additionally, the proposed scheme reduces the implementation cost by 27.95% compared to conventional MPPT techniques.
Keywords
Global maximum power point (GMPP), Objective function, Modified current sensorless (MCSL), Partially shaded conditions (PSCs), Photovoltaic (PV) system
Divisions
sch_ecs
Funders
Ministry of Education, Malaysia (Grant No: FRGS/1/2020/TK0/UM/02/15)
Publication Title
Energy
Volume
263
Issue
A
Publisher
Pergamon-Elsevier Science Ltd
Publisher Location
THE BOULEVARD, LANGFORD LANE, KIDLINGTON, OXFORD OX5 1GB, ENGLAND