Grid Connected Solar PV System with SEPIC Converter Compared with Parallel Boost Converter Based MPPT

Abstract

The main objective of this work is to study the behaviour of the solar PV systems and model the efficient Grid-connected solar power system. The DC-DC MPPT circuit using chaotic pulse width modulation has been designed to track maximum power from solar PV module. The conversion efficiency of the proposed MPPT system is increased when CPWM is used as a control scheme. This paper also proposes a simplified multilevel (seven level) inverter for a grid-connected photovoltaic system. The primary goal of these systems is to increase the energy injected to the grid by keeping track of the maximum power point of the panel, by reducing the switching frequency, and by providing high reliability. The maximum power has been tracked experimentally. It is compared with parallel boost converter. Also this model is based on mathematical equations and is described through an equivalent circuit including a PV source with MPPT, a diode, a series resistor, a shunt resistor, and dual boost converter with active snubber circuit. This model can extract PV power and boost by using dual boost converter with active snubber. By using this method the overall system efficiency is improved thereby reducing the switching losses and cost.

Improved adaptive input voltage control of a solar array interfacing current mode controlled boost power stage

“…3. Derivative operator is necessary for input current estimation in (13), increasing the amount of noise injected into the system…”

“…In order to cope with time-varying nature of photovoltaic generators, robust and/or adaptive control approaches are obviously required to attain predetermined closed-loop performance throughout the whole operation range [12]. Nevertheless, until today, the only attempt to apply adaptive control approach to control SA terminal voltage was presented in [13], where input voltage of a SA-fed current-controlled boost power stage (which is probably most frequently utilized as photovoltaic generator interfacing converter [14]) was regulated, utilizing adaptive control method based on real-time SA dynamic resistance estimation. While yielding satisfactory results, the presented approach suffers from several drawbacks, namely operation point dependence, applicability to single-phase AC systems only and noise immunity, as revealed in this paper.…”

“…Problem formulation is given in Section 2. The solution proposed in [13] is explained in Section 3, followed by revealing its inherent drawbacks in Section 4. The proposed improved solution is described in Section 5.…”

Simple control scheme buck-boost DC-DC converter for stand alone PV application system

“…Therefore, the power electronics converter interface between a solar panel and a load battery is introduced. The several pulse width modulator (PWM) DC-DC converter is used to extract the maximum power form PV solar panel [7][8][9]. The conventional of photovoltaic power system may use on-off directly control system.…”

PV Based Sliding Mode Controller for Voltage Regulation in Positive Output Elementary Parallel Connected Boost Converter

“…A robust controller for parallel dc-dc buck converters has been coined by combining the concepts of integral-variable-structure and multiple-sliding-surface control [6]. Grid connected solar PV system with SEPIC converter compared with parallel boost converter based MPPT [14]. Nonlinear back-stepping adaptive controller has been proposed for the design of parallel DC-DC buck converters with uncertainties of load and power disturbance.…”