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ESBC: an enhanced modular multilevel converter with H-bridge front end (2017)
Conference Proceeding
Amankwah, E., Costabeber, A., Jasim, O., Trainer, D., & Clare, J. C. (2017). ESBC: an enhanced modular multilevel converter with H-bridge front end

This paper presents the Enhanced Series Bridge Converter (ESBC), a hybrid modular multilevel converter with H-bridge front end suitable for high power grid applications. It retains the advantages of other modular multilevel topologies while offering... Read More

Design optimization of a short-term duty electrical machine for extreme environment (2017)
Journal Article
Arumugam, P., & Amankwah, E. K. (2017). Design optimization of a short-term duty electrical machine for extreme environment. IEEE Transactions on Industrial Electronics, 64(12), 9784-9794. doi:10.1109/TIE.2017.2711555

This paper presents design optimisation of a short term duty electrical machine for extreme environments of high temperature and high altitudes. For such extreme environmental conditions of above 80⁰C and altitudes of 30km, thermal loading limits are... Read More

The Series Bridge Converter (SBC): design of a compact modular multilevel converter for grid applications (2016)
Conference Proceeding
Amankwah, E. K., Costabeber, A., Watson, A. J., Trainer, D., Jasim, O., Chivite-Zabalza, J., & Clare, J. C. (2016). The Series Bridge Converter (SBC): design of a compact modular multilevel converter for grid applications

This paper presents a novel hybrid modular multilevel voltage source converter suitable for grid applications. The proposed converter retains the advantages of other modular multilevel topologies and can be made more compact making it attractive for... Read More

The Series Bridge Converter (SBC): a hybrid modular multilevel converter for HVDC applications (2016)
Conference Proceeding
Amankwah, E. K., Costabeber, A., Watson, A. J., Trainer, D., Jasim, O., Chivite-Zabalza, J., & Clare, J. C. (2016). The Series Bridge Converter (SBC): a hybrid modular multilevel converter for HVDC applications

This paper presents a novel hybrid modular multilevel voltage source converter suitable for HVDC applications. It has the advantages of other modular multilevel topologies and can be made more compact making it attractive for offshore stations and ci... Read More

Operation of a hybrid modular multilevel converter during grid voltage unbalance (2016)
Journal Article
Amankwah, E. K., Watson, A. J., & Clare, J. C. (2016). Operation of a hybrid modular multilevel converter during grid voltage unbalance. IET Generation, Transmission and Distribution, 10(12), doi:10.1049/iet-gtd.2015.0766. ISSN 1751-8687

The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the ‘main’ H-bridge. The converter has similar advantages to other emerging modular mul... Read More

The star-switched MMC (SSMMC): a hybrid VSC for HVDC applications (2016)
Conference Proceeding
Woldegiorgis, D. L., Outram, J., Amankwah, E. K., Trainer, D., & Clare, J. C. (2016). The star-switched MMC (SSMMC): a hybrid VSC for HVDC applications

This paper presents a new hybrid VSC topology (the Star-Switched MMC) – suitable for HVDC applications. The basic structure and operating principles of the topology are described. Control strategies that regulate the power exchanged between the VSC,... Read More

Hybrid HVDC circuit breaker with self-powered gate drives (2016)
Journal Article
Effah, F. B., Watson, A. J., Ji, C., Amankwah, E. K., Johnson, C. M., Davidson, C., & Clare, J. C. (2016). Hybrid HVDC circuit breaker with self-powered gate drives. IET Power Electronics, 9(2), doi:10.1049/iet-pel.2015.0531. ISSN 1755-4543

The ever increasing electric power demand and the advent of renewable energy sources have revived the interest in high-voltage direct current (HVDC) multi-terminal networks. However, the absence of a suitable circuit breaker or fault tolerant VSC st... Read More

Impact of slot/pole combination on inter-turn short-circuit current in fault-tolerant permanent magnet machines (2015)
Journal Article
Dusek, J., Arumugam, P., Brunson, C., Amankwah, E. K., Hamiti, T., & Gerada, C. (2015). Impact of slot/pole combination on inter-turn short-circuit current in fault-tolerant permanent magnet machines. IEEE Transactions on Magnetics, 52(4), doi:10.1109/TMAG.2015.2500894. ISSN 0018-9464

This paper investigates the influence of the slot/pole (S/P) combination on inter-turn short-circuit (SC) current in fault-tolerant permanent magnet (FT-PM) machines. A 2-D sub-domain field computational model with multi-objective genetic algorithm i... Read More

Control of a hybrid modular multilevel converter during grid voltage unbalance (2015)
Conference Proceeding
Amankwah, E. K., Watson, A., Wheeler, P., & Clare, J. C. Control of a hybrid modular multilevel converter during grid voltage unbalance

The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the ‘main’ bridge. The converter has similar advantages to other emerging modular multi... Read More

Impact of soft magnetic material on design of high speed permanent magnet machines
Journal Article
Fernando, N., Vakil, G., Arumugam, P., Amankwah, E. K., Gerada, C., & Bozhko, S. (in press). Impact of soft magnetic material on design of high speed permanent magnet machines. IEEE Transactions on Industrial Electronics, doi:10.1109/TIE.2016.2587815. ISSN 0278-0046

This paper investigates the effect of two soft magnetic materials on a high speed machine design, namely 6.5% Silicon Steel and Cobalt-Iron alloy. The effect of design parameters on the machine performance as an aircraft starter-generator is analysed... Read More

High speed solid rotor permanent magnet machines: concept and design
Journal Article
Arumugam, P., Xu, Z., La Rocca, A., Vakil, G., Dickinson, M., Amankwah, E. K., …Pickering, S. (in press). High speed solid rotor permanent magnet machines: concept and design. IEEE Transactions on Transportation Electrification, 2(3), doi:10.1109/TTE.2016.2592684. ISSN 2332-7782

This paper proposes a novel solid rotor topology for an Interior Permanent Magnet (IPM) machine, adopted in this case for an aircraft starter-generator design. The key challenge in the design is to satisfy two operating conditions which are: a high t... Read More