Publications

DC-to-DC converters with continuous input and output power

Williams Barry

IEEE Transactions on Power Electronics Vol 28, pp. 2307-2316 (2013)

https://doi.org/10.1109/TPEL.2012.2213272

Wind turbine power coefficient analysis of a new maximum power point tracking technique

Xia Yuanye, Ahmed Khaled, Williams Barry

IEEE Transactions on Industrial Electronics Vol 60, pp. 1122-1132 (2013)

https://doi.org/10.1109/TIE.2012.2206332

A maximum power point tracking technique for partially shaded photovoltaic systems in microgrids

Alajmi Bader N F M T, Ahmed Khaled, Finney Stephen, Williams Barry

IEEE Transactions on Industrial Electronics Vol 60, pp. 1596-1606 (2013)

https://doi.org/10.1109/TIE.2011.2168796

Improved instantaneous average current-sharing control scheme for parallel-connected inverter considering line impedance impact in microgrid networks

Roslan Mohd Azrik Bin, Ahmed Khaled, Finney Stephen, Williams Barry

IEEE Transactions on Power Electronics Vol 26, pp. 702-716 (2011)

https://doi.org/10.1109/TPEL.2010.2102775

New Fast DC Fault Blocking Hybrid Thyristor-based Multilevel Converter for Offshore Networks

Abdelaziz Yousef N, Ahmed Khaled H, Williams Barry W

2024 Energy Conversion Congress & Expo Europe (ECCE Europe) , pp. 1-6 (2024)

https://doi.org/10.1109/ecceeurope62508.2024.10752084

A review of modular electrical sub-systems of electric vehicles

Darwish Ahmed, Elgenedy Mohamed A, Williams Barry W

Energies Vol 17 (2024)

https://doi.org/10.3390/en17143474

More publications

Research Interests

Power Electronics and Electric Drives

Projects

High Speed, Magnet Free Traction Motors and Drives

Ahmed, Khaled (Principal Investigator) Williams, Barry (Co-investigator)

01-Jun-2019 - 30-Nov-2020

DC Grid for Empowering PV Generation in Qatar

Williams, Barry (Principal Investigator) Holliday, Derrick (Co-investigator)

01-Feb-2017 - 01-Feb-2020

Efficient Modular Pulsed Power Water Disinfection System for Water Treatment and Reuse Applications

Williams, Barry (Principal Investigator)

01-Mar-2015 - 28-Feb-2018

DC Transmission and Distribution Networks

Williams, Barry (Principal Investigator) Holliday, Derrick (Co-investigator)

01-Mar-2013 - 16-Dec-2016

HiDEF. Supergen 3 HDPS Renewal Core and Pluses

Infield, David (Principal Investigator) Ault, Graham (Co-investigator) Bell, Keith (Co-investigator) Burt, Graeme (Co-investigator) Finney, Stephen (Co-investigator) Fletcher, John (Co-investigator) Johnstone, Cameron (Co-investigator) Kelly, Nicolas (Co-investigator) Kockar, Ivana (Co-investigator) McGregor, Peter (Co-investigator) Williams, Barry (Co-investigator)

The HiDEF consortium will explore highly decentralised energy futures. At the core of this is a sustainable electricity supply system that makes optimum use of decentralised assets and in which energy consumers participate actively in appropriately structured decentralised markets. This major change from the present arrangement, where most consumers are passive users of externally supplied energy services, will require new attitudes to energy and new ways working. The technical, market and social aspects of this transformation will be addressed in detail by the multi-disciplinary consortium that has been formed to embrace power system engineers, experts in electricity markets and researchers aware of the social and perceptual challenges. The technical developments that underpin the changes outlined above are the development of new high efficiency micro-CHP units (including the latest high temperature solid oxide fuel cells), the development of ever cheaper PV and micro-wind systems and the role out of smart electricity meters that will facilitate the involvement of even domestic consumers in demand side management. As time varying renewable sources become increasing prevalent in electricity supply, both in the form of small decentralised generators, and in the form of major offshore wind farms, tidal and wave energy installations, the role of highly decentralised load management will become ever more important. In addition the power electronic interfaces of decentralised generators can be used to provide more than just power - with suitable control other important network services like local voltage control, and even system frequency control, can be contributed. The consortium builds on the important work undertaken by the Highly Distributed Power Systems (HDPS) project that established base line models for the new technologies, developed suitable scenarios, and developed the cell concept of delivery.

01-Jul-2009 - 30-Sep-2013

High-temperature Silicon Carbide Electronics (HITSIC)

Finney, Stephen (Principal Investigator) Williams, Barry (Co-investigator)

The project aims to research and develop a novel semiconductor process to fabricate low-voltage electronics. The material used in the process is silicon carbide (SiC). Silicon carbide has excellent high-temperature properties. This means that electronics fabricated using SiC can operate potentially at temperatures as high as 600Celsius. This compares with limits of 150 Celsius for Silicon-based electronics; the standard material used for electronics. Other novel materials such a Gallium-Arsenide and Gallium-Nitride can operate at higher temperatures than Silicon, but their development has been so far restricted to radio-frequency applications. High-temperature electronics, particularly power semiconductors used in power applications, have recently been developed to the prototype stage, with simple devices like diodes now appearing on the market. As more complex power semiconductor devices reach the market there will be a need for control electronics to operate and control the devices. Our proposal aims to develop a novel process that allows fabrication of low-voltage control electronics on silicon carbide. This will allow the control electronics to be integrated with the power devices and operate at high temperatures. In addition to the power electronic applications described, the technology will allow electronics to operate in harsh and extreme environments. One example is sensor equipment for oil- and gas-well applications. Significant fuel reserves exist below 5km but at these depths temperatures exceed the capabilities of existing electronics technology. The technology proposed, when integrated in down-hole applications, will realise cheaper, more compact equipment that eases some of the technical challenges of reaching deep oil and gas reserves. The technology proposed can be applied to a number of key energy sectors including power generation, electrical transmission and distribution, electrical energy utilisation, transportation and energy storage. Benefits accrue from the improved efficiency and reduced cost that the adoption of silicon-carbide devices realises. The research proposed will therefore have a significant impact on many aspects of the energy use of developed and developing nations.

30-Mar-2009 - 28-Sep-2012

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