Gunsal, I. orcid.org/0000-0002-7708-9790, Stone, D.A. orcid.org/0000-0002-5770-3917 and Foster, M.P. orcid.org/0000-0002-8565-0541 (2018) A unique pulse width modulation to reduce leakage current for cascaded H-bridge inverters in PV and battery energy storage applications. Energy Procedia, 151. pp. 84-90. ISSN 1876-6102
Abstract
Cascaded H-bridge (CHB) inverters operate with isolated DC sources, which makes them a favorable topology for hybrid-interfaced applications. Parasitic capacitance of grounded photovoltaics (PV) results in leakage currents that may deteriorate the system performance and raise safety concerns. In order to address this problem, a common-mode equivalent circuit for a multilevel CHB is illustrated. The study reveals that common modulation techniques such as phase shifted pulse width modulation fail to suppress the leakage current. A unique modulation scheme, based on considering the switching states is proposed in order to ensure that the topology conforms to the transformerless inverter regulations and standards such as VDE-0126-1-1. Simulation study results for conventional and proposed modulation methods are presented and analyzed in a symmetrical grid inductance filter circuit.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2018 Elsevier. |
Keywords: | Leakage current; cascaded H-bridge (CHB); pulse width modulation (PWM); transformerless inverter |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Engineering (Sheffield) > Department of Electronic and Electrical Engineering (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 02 Oct 2019 11:20 |
Last Modified: | 02 Oct 2019 11:20 |
Status: | Published |
Publisher: | Elsevier |
Refereed: | Yes |
Identification Number: | 10.1016/j.egypro.2018.09.032 |
Related URLs: | |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:151484 |