Design and analysis of a transformerless STATCOM based on hybrid cascaded multilevel converter

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Abstract

This paper presents a new concept of Static Synchronous COMpensator (STATCOM) based on a Hybrid Cascaded Multilevel Converter (HCMC). The HCMC consists of a two- level voltage converter and a wave-shaping circuit formed by cascaded H-bridge Sub-Modules (SM). Firstly, the operation principle and overall control strategy of HCMC are presented. After that, some key parameters including size of capacitors, numbers of sub-modules are in-depth analyzed. And then, a thorough comparison between the proposed HCMC-based STATCOM and conventional cascaded H-bridge based STATCOM is made, which turns out that the proposed HCMC-based STATCOM requires less number, size and stored energy of capacitors and has less power loss. Finally, a 35 kV/±50 Mvar HCMC-based STATCOM simulation model is constructed in PSCAD/EMTDC software platform. The simulation results validate the feasibility of the proposed HCMC-based STATCOM and the correctness of the analysis.
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Detaljer

This paper presents a new concept of Static Synchronous COMpensator (STATCOM) based on a Hybrid Cascaded Multilevel Converter (HCMC). The HCMC consists of a two- level voltage converter and a wave-shaping circuit formed by cascaded H-bridge Sub-Modules (SM). Firstly, the operation principle and overall control strategy of HCMC are presented. After that, some key parameters including size of capacitors, numbers of sub-modules are in-depth analyzed. And then, a thorough comparison between the proposed HCMC-based STATCOM and conventional cascaded H-bridge based STATCOM is made, which turns out that the proposed HCMC-based STATCOM requires less number, size and stored energy of capacitors and has less power loss. Finally, a 35 kV/±50 Mvar HCMC-based STATCOM simulation model is constructed in PSCAD/EMTDC software platform. The simulation results validate the feasibility of the proposed HCMC-based STATCOM and the correctness of the analysis.
OriginalsprogEngelsk
TidsskriftInternational Journal of Electrical Power and Energy Systems
Volume/Bind104
Sider (fra-til)694-704
Antal sider11
ISSN0142-0615
DOI
StatusUdgivet - jan. 2019
PublikationsartForskning
Peer reviewJa

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