Abstract
Power electronic converters are used to nullify the input fluctuations from a solar photovoltaic unit because of intermittent solar irradiance and to make the terminal voltage grid compatible with the desired frequency. The conventional two-level converters suffer from low power quality and high voltage stress. In this article, a new multilevel inverter topology called Dual Source Multilevel Inverter (DS-MLI) with fewer power switches is proposed for solar PV power conversion systems. It can operate in symmetric and asymmetric operating modes with no cascading. This reduces the switching components required to produce several levels in the staircase voltage waveform. A closed-loop control algorithm is designed using the state-space averaging technique, and we assess the dynamic behaviour of the system under step change. We carry the simulation out in MATLAB environment. The experimental prototype of DS-MLI rated 1 kW is fabricated using FGA25N120-ANTD IGBTs, and an eco-sense made solar PV emulator is used for analysing the performance of DS-MLI while interfacing with solar PV unit. We compare the suggested scheme with its conventional counterpart in the aspects of components required, cost and efficiency, and the results are presented.
Highlights
With technology, the price of the solar PV panels and the associated accessories has reduced drastically over the years [1]
Because of the intermittency in solar irradiance, the voltage delivered at the terminals of a solar PV unit will be continuously fluctuating, and power electronic converters are used to deliver a regulated terminal voltage
I) develop an H-Bridge based Dual Source Multilevel Inverter (DS-MLI) topology which requires fewer power switches when compared to the topologies found in recent literature and can achieve symmetric and asymmetric operation without cascading ii) design a dual loop control scheme which gives better dynamic response under changing irradiance conditions
Summary
The price of the solar PV panels and the associated accessories has reduced drastically over the years [1]. A sub-MLI module with reduced power components is explained in [12] wherein all the switches in the level adder are bidirectional They discuss an envelope types basic unit which can be cascaded with many such units for the higher number of levels in the terminal voltage in [13]. A control algorithm for monophase cascaded H-bridge multilevel inverter it suggests based solar energy conversion system in [19], this method provides DC capacitor balancing and high-power quality during partial shading and panel mismatch conditions. I) develop an H-Bridge based DS-MLI topology which requires fewer power switches when compared to the topologies found in recent literature and can achieve symmetric and asymmetric operation without cascading ii) design a dual loop control scheme which gives better dynamic response under changing irradiance conditions.
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