Maximum Power Point Tracking Technique for Photovoltaic Power System at Sudden Change in Irradiance using Fuzzy Self Tuning PID Controller

Document Type : Original Article

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Power Dept. , Faculty of Engineering , Helwan University

Abstract

This paper presented a new digital control scheme for photovoltaic (PV) system, using a new approach maximum power point tracking (MPPT) algorithm. Photovoltaic power generation system required an effective controller to overcome sudden irradiance change and to maximize their efficiency in order to be more efficient & more precise. This paper proposed a new approach of MPPT based on a voltage control approach of power converter with PI (proportional integral) controller combination for the boost converter to adapt the duty cycle. The input voltage reference is adaptively perturbed with variable steps until the maximum power is reached. A state-space model is derived through averaging method, with the control input being the duty ratio of the pulse width modulator for a dc–dc boost converter. The proposed control scheme achieved stable condition in the control region of the PV panel and eliminated the steady state oscillations when there is sudden change of irradiance in the maximum power operating point. Furthermore, the PV system became more efficient, as proven by sudden change in radiation conditions for 10 seconds, where energy can be saved approximately 76.66%.

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