MPPT for Photovoltaic System Using Nonlinear Controller

Neelma Naz,Ramsha Iftikhar,Naghmash Ali,Iftikhar Ahmad,Hammad Armghan,Muhammad Arsalan

doi:10.1155/2018/6979723

Abstract

Photovoltaic (PV) system generates energy that varies with the variation in environmental conditions such as temperature and solar radiation. To cope up with the ever increasing demand of energy, the PV system must operate at maximum power point (MPP), which changes with load as well as weather conditions. This paper proposes a nonlinear backstepping controller to harvest maximum power from a PV array using DC-DC buck converter. A regression plane is formulated after collecting the data of the PV array from its characteristic curves to provide the reference voltage to track MPP. Asymptotic stability of the system is proved using Lyapunov stability criteria. The simulation results validate the rapid tracking and efficient performance of the controller. For further validation of the results, it also provides a comparison of the proposed controller with conventional perturb and observe (P&O) and fuzzy logic-based controller (FLBC) under abrupt changes in environmental conditions.

Highlights

Human dependence on fossil fuels, for the generation of energy, has created numerous environmental catastrophes across the planet
The percentage of the solar energy shining on a PV device that is converted into usable electricity is termed as conversion efficiency [2]
The first two subsections critically analyzes the performance of the proposed controller under sudden changes in temperature and irradiance

Summary

Introduction

Human dependence on fossil fuels, for the generation of energy, has created numerous environmental catastrophes across the planet. Global warming, and ozone depletion are the direct consequences of this ill use of fossil fuels. This dire environmental situation is demanding us to utilize renewable energy resources to restore the damage done by fuel consumption. Solar cell is one such promising device that converts solar energy into electrical energy that can be used directly in a number of ways. Solar or PV cells are quite promising, yet they are unable to convert all the solar energy into electricity. The percentage of the solar energy shining on a PV device that is converted into usable electricity is termed as conversion efficiency [2]. Different techniques have been devised to extract maximum power from PV cells, so that they can operate at their maximum operating efficiency [3]

Methods

Results

Conclusion