Abstract
The quasi-impedance source inverters/quasi-Z source inverters (Q-ZSIs) have shown improvement to overwhelmed shortcomings of regular voltage-source inverters (VSIs) and current-source inverters (CSIs) in terms of efficiency and buck-boost type operations. The Q-ZSIs encapsulated several significant merits against conventional ZSIs, i.e., realized buck/boost, inversion and power conditioning in a single power stage with improved reliability. The conventional inverters have two major problems; voltage harmonics and boosting capability, which make it impossible to prefer for renewable generation and general-purpose applications such as drive acceleration. This work has proposed a Q-ZSI with five-level six switches coupled inverter. The proposed Q-ZSI has the merits of operation, reduced passive components, higher voltage boosting capability and high efficiency. The modified space vector pulse width modulation (PWM) developed to achieve the desired control on the impedance network and inverter switching states. The proposed PWM integrates the boosting and regular inverter switching state within one sampling period. The PWM has merits such as reduction of coupled inductor size, total harmonic reduction with enhancing of the fundamental voltage profile. In comparison with other multilevel inverters (MLI), it utilizes only half of the power switch and a lower modulation index to attain higher voltage gain. The proposed inverter dealt with photovoltaic (PV) system for the stand-alone load. The proposed boost inverter topology, operating performance and control algorithm is theoretically investigated and validated through MATLAB/Simulink software and experimental upshots. The proposed topology is an attractive solution for the stand-alone and grid-connected system.
Highlights
Photovoltaic (PV) energy, extracted through solar cells is a mandatory power generation technology to meet out the global power demand [1]
When connecting a coupled inverter with an impedance network, the pulse width modulation (PWM) methods need to be modified. Based on this technical background and coupled multilevel inverters (MLI) and control scheme requirements of Z (impedance) source inverter (ZSI), this paper suggests a single-phase MLI coupled inverter topology with five-level output for PV application
The control switching scheme strategy is designed in PIC16F778A microcontroller, and the collaborative results are shown in keyset two channels digital signal oscilloscope (DSO)
Summary
Madasamy Periyanayagam 1, * , Suresh Kumar V 2 , Bharatiraja Chokkalingam 3,5, * , Sanjeevikumar Padmanaban 4 , Lucian Mihet-Popa 6 and Yusuff Adedayo 5. Received: 19 January 2020; Accepted: 12 February 2020; Published: 17 February 2020
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