relation: https://khub.utp.edu.my/scholars/18567/
title: A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation
creator: Islam, M.T.
creator: Alam, M.A.
creator: Lipu, M.S.H.
creator: Hasan, K.
creator: Meraj, S.T.
creator: Masrur, H.
creator: Rahman, M.F.
description: Boost converters and multilevel inverters (MLI) are frequently included in low-voltage solar photovoltaic (PV) systems for grid integration. However, the use of an inductor-based boost converter makes the system bulky and increases control complexity. Therefore, the switched-capacitor-based MLI emerges as an efficient DC/AC voltage convertor with boosting capability. To make classical topologies more efficient and cost-effective for sustainable power generation, newer topologies and control techniques are continually evolving. This paper proposes a reduced-component-count five-level inverter design for generating stable AC voltages for sustainable grid-integrated solar photovoltaic applications. The proposed topology uses seven switching devices of lower total standing voltage (TSV), three diodes, and two DC-link capacitors to generate five-level outputs. By charging and discharging cycles, the DC capacitor voltages are automatically balanced. Thus, no additional sensors or control circuitry is required. It has inherent voltage-boosting capability without any input boost converter. A low-frequency-based half-height (HH) modulation technique is employed in the standalone system for better voltage quality. Extensive simulations are performed in a MATLAB/Simulink environment to estimate the performance of the proposed topology, and 17.58 THDs are obtained in the phase voltages. Using a small inductor in series or an inductive load, the current THD reduces to 8.23. Better dynamic performance is also observed with different loading conditions. A miniature five-level single-phase laboratory prototype is developed to verify the accuracy of the simulation results and the viability of the proposed topology. © 2023 by the authors.
date: 2023
type: Article
type: PeerReviewed
identifier:   Islam, M.T. and Alam, M.A. and Lipu, M.S.H. and Hasan, K. and Meraj, S.T. and Masrur, H. and Rahman, M.F.  (2023) A Single DC Source Five-Level Switched Capacitor Inverter for Grid-Integrated Solar Photovoltaic System: Modeling and Performance Investigation.  Sustainability (Switzerland), 15 (10).       
relation: https://www.scopus.com/inward/record.uri?eid=2-s2.0-85160774362&doi=10.3390%2fsu15108405&partnerID=40&md5=cee9fcc5247d0c9887d48a8340f578c0
relation: 10.3390/su15108405
identifier: 10.3390/su15108405