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Optimization of switching losses and capacitor voltage ripple using model predictive control of a cascaded H-bridge multi-level StatCom

Townsend, Christopher D.; Summers, Terence J.; Vodden, John Alan; Watson, Alan James; Betz, Robert E.; Clare, Jon C.

Authors

Christopher D. Townsend

Terence J. Summers

John Alan Vodden

Alan James Watson alan.watson@nottingham.ac.uk

Robert E. Betz

Jon C. Clare jon.clare@nottingham.ac.uk

Abstract

This paper further develops a Model Predictive Control (MPC) scheme which is able to exploit the large number of redundant switching states available in a multi-level H-bridge StatCom (H-StatCom). The new sections of the scheme provide optimised methods to trade off the harmonic performance with converter switching losses and capacitor voltage ripple. Varying the pulse placement within the modulation scheme and modifying the heuristic model of the voltage balancing characteristics allows the MPC scheme to achieve superior performance to that of the industry standard phase shifted carrier modulation technique. The effects of capacitor voltage ripple on the lifetime of the capacitors is also investigated. It is shown that the MPC scheme can reduce capacitor voltage ripple and increase capacitor lifetime. Simulation and experimental results are presented that confirm the correct operation of the control and modulation strategies.

Journal Article Type Article
Publication Date Jul 31, 2013
Journal IEEE Transactions on Power Electronics
Print ISSN 0885-8993
Electronic ISSN 0885-8993
Publisher Institute of Electrical and Electronics Engineers
Peer Reviewed Peer Reviewed
Volume 28
Issue 7
Institution Citation Townsend, C. D., Summers, T. J., Vodden, J. A., Watson, A. J., Betz, R. E., & Clare, J. C. (2013). Optimization of switching losses and capacitor voltage ripple using model predictive control of a cascaded H-bridge multi-level StatCom. IEEE Transactions on Power Electronics, 28(7), doi:10.1109/TPEL.2012.2219593
DOI https://doi.org/10.1109/TPEL.2012.2219593
Keywords Multi-level converters, StatCom, voltage bal┬Čancing, modulation strategy, control strategy
Publisher URL http://ieeexplore.ieee.org/document/6307885/
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information (c)2014 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other users, including reprinting/ republishing this material for advertising or promotional purposes, creating new collective works for resale or redistribution to servers or lists, or reuse of any copyrighted components of this work in other works.

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf




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