A Modified Multi-Level Inverter System for Grid-Tied DES Applications

Sajjad Ahmed, Muhammad Asghar Saqib (), Syed Abdul Rahman Kashif, Khurram Hashmi, Flah Aymen, Kareem M. AboRas, Laura Jasińska and Zbigniew Leonowicz ()
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Sajjad Ahmed: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Muhammad Asghar Saqib: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Syed Abdul Rahman Kashif: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Khurram Hashmi: Department of Electrical Engineering, University of Engineering and Technology, Lahore 54890, Pakistan
Flah Aymen: Energy Processes Environment and Electrical Systems Unit, National Engineering School of Gabes, University of Gabes, Gabes 6072, Tunisia
Kareem M. AboRas: Department of Electrical Power and Machines, Faculty of Engineering, Alexandria University, Alexandria 21544, Egypt
Laura Jasińska: Faculty of Electronics Microsystems and Photonics, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland
Zbigniew Leonowicz: Department of Electrical Engineering, Wroclaw University of Science and Technology, 50-370 Wroclaw, Poland

Sustainability, 2022, vol. 14, issue 24, 1-15

Abstract: Energy harvesting from renewable energy sources is trending in the world due to inventions in modern technology. This paper proposes a grid-tied single-phase modified W-type 81-level inverter. Inverter design equations to calculate various parameters, such as the number of voltage levels and the number of DC power sources, along with the feedback controller equations, are developed to integrate the proposed topology with an electric power grid. The modeling of the control system for the proposed topology is carried out in the synchronously rotating reference frame for single-phase systems. The PWM generation part of the proposed inverter system makes use of the binary search nearest level algorithm to efficiently track the grid voltage signal. The proposed system integrates the inverter with the grid without the need for an output filter. The efficiency analysis shows that the proposed system delivers active and reactive power to the grid with an efficiency of around 90% and a THD of 1.04%. The voltage and current waveforms for the dynamic active and reactive power flow reveal that the proposed system exhibits a good transient and steady-state response. The overall system is simulated in MATLAB/Simulink and the results are verified using a hardware implementation of the prototype circuit.

Keywords: multilevel inverters; MWMLI; smart grids; grid-tied inverters; feedback control of inverters (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2022
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