Abstract
Photovoltaic generators (PVG) produce a variable power according to the solar radiation (G) and temperature (T). This variation affects the sizing of the components of DC / DC converters, powered by such PVG, and make it difficult. The effects may differ from one component to another. The main and critical one is presented by the inductor, the element that stores the energy during sampled periods. We propose in this work an auto-adaptation of these inductor values to maintain optimal performance of the power yield of these converters. Our idea is to replace the inductor by a coupled inductor where this adjustment is made by the addition of an adjustable electric field in the magnetic core. Low current intensities come from the PVG supply the second inductor of the coupled inductor through a circuit controlled by a fuzzy controller (FC). The whole system is modeled and simulated under MATLAB/SIMULINK for the control part of the system and under PSPICE for the power part of the system. The obtained results show good performances of the proposed converter over the standard one.
Highlights
The purpose of the present paper is to find a topology designed to photovoltaic applications to ensure minimum losses whatever climate changes
The main function performed by these controls is to ensure, at all times, a perfect adaptation between the Photovoltaic generators (PVG) and load by making the operating point in the maximum power point (MPP), this adaptation is assured by a DC/DC converters [5]
The paper organizes as follows: as a starting point, we focus on a standard PV system with standard DC/DC converter commanded by an Maximum Power Point Tracking (MPPT) controller as presented in figure (1) to calculate the power yield of the DC/DC converter used in this application for various radiation levels
Summary
The purpose of the present paper is to find a topology designed to photovoltaic applications to ensure minimum losses whatever climate changes. A Photovoltaic generators (PVG) are characterized by non-linear I (V) characteristics with different points of maximum power (MPP) [1, 2]. These characteristics depend on the level of radiation (G) and the temperature of PV cells that compose it [1, 2, 3]. To address the latter influence, specific control laws were designed and developed since 1968 to [3, 4], to allow these PVG to produce their maximum electrical power. This type of control is called Maximum Power Point Tracking (MPPT) [4, 5]. The main function performed by these controls is to ensure, at all times, a perfect adaptation between the PVG and load by making the operating point in the maximum power point (MPP), this adaptation is assured by a DC/DC converters (figure 1) [5]
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