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Lookup NU author(s): Dr Sze Sing Lee
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IEEETransformerless (TL) grid-connected photovoltaic (PV) inverters with a common-ground (CG) circuit architecture exhibit some excellent features in removing the leakage current concern and improving the overall efficiency. However, the ability to cope up with a wide range of input voltage changes whilst maintaining the output voltage in a single power conversion stage is a key technological challenge. Considering this, this work proposes a novel dual-mode switched-capacitor five-level (DMSC5L)-TL inverter with a CG feature. The proposed topology is comprised of a single dc source and power diode, three capacitors, four unidirectional and three bi-directional power switches. Based on the series-parallel switching conversion of the involved switches, the proposed DMSC5L-TL inverter can generate five distinctive output voltage levels during both the boost and buck modes of the operation with a self-voltage balancing operation for the involved capacitors. A simple dead-beat continuous current controller set (DB3CS) modulation technique is also used to handle both the active and reactive power exchange within a fixed switching frequency operation. The proposed circuit description with its DB3CS details, the design guidelines with a comparative study, and some experimental results are also given to show the feasibility of the proposed solution for the practical applications.
Author(s): Barzegarkhoo R, Siwakoti Y, Aguilera RP, Khan N, Lee SS, Blaabjerg FG
Publication type: Article
Publication status: Published
Journal: IEEE Transactions on Power Electronics
Pages: 13740 -13753
Print publication date: 01/12/2021
Online publication date: 20/04/2021
Acceptance date: 02/04/2018
ISSN (print): 0885-8993
ISSN (electronic): 1941-0107
Publisher: Institute of Electrical and Electronics Engineers Inc.
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