All Outputs (554)

Selective harmonic mitigation technique for cascaded H-bridge converters with nonequal DC link voltages (2012)
Journal Article
Napoles, J., Watson, A. J., Padilla, J. J., Leon, J. I., Franquelo, L. G., Wheeler, P. W., & Aguirre, M. A. (2013). Selective harmonic mitigation technique for cascaded H-bridge converters with nonequal DC link voltages. IEEE Transactions on Industrial Electronics, 60(5), 1963-1971. https://doi.org/10.1109/TIE.2012.2192896

Multilevel converters have received increased interest recently as a result of their ability to generate high quality output waveforms with a low switching frequency. This makes them very attractive for high-power applications. A cascaded H-bridge co... Read More about Selective harmonic mitigation technique for cascaded H-bridge converters with nonequal DC link voltages.

Comparative evaluation of three-phase AC-AC matrix converter and voltage DC-link back-to-back converter systems (2011)
Journal Article
Friedli, T., Kolar, J. W., Rodriguez, J., & Wheeler, P. W. (2012). Comparative evaluation of three-phase AC-AC matrix converter and voltage DC-link back-to-back converter systems. IEEE Transactions on Industrial Electronics, 59(12), 4487-4510. https://doi.org/10.1109/TIE.2011.2179278

A thermal improvement technique for phase windings of electrical machines (2011)
Journal Article
Galea, M., Gerada, C., Raminosa, T., & Wheeler, P. (2012). A thermal improvement technique for phase windings of electrical machines. IEEE Transactions on Industry Applications, 48(1), https://doi.org/10.1109/TIA.2011.2175470

In electrical machines, a higher torque/force density can usually be achieved by increasing the current density in the windings. However, the resulting increase in copper losses leads to higher temperatures in the coils, especially in the centre of t... Read More about A thermal improvement technique for phase windings of electrical machines.

Construction and testing of the 3.3 kV, 300 kVA UNIFLEX-PM prototype (2009)
Journal Article
Watson, A. J., Mondai, G., Dang, H., Wheeler, P. W., & Clare, J. C. (2009). Construction and testing of the 3.3 kV, 300 kVA UNIFLEX-PM prototype. Epe Journal, 19(4), 59-64. https://doi.org/10.1080/09398368.2009.11463738

This paper presents details of the experimental implementation of a prototype multi-cellular converter for application in future electricity supply networks. Such a converter is capable of independently controlling power flow between various parts of... Read More about Construction and testing of the 3.3 kV, 300 kVA UNIFLEX-PM prototype.

Feed-forward space vector modulation for single-phase multilevel cascaded converters with any DC voltage ratio (2008)
Journal Article
Leon, J. I., Vazquez, S., Watson, A. J., Franquelo, L. G., Wheeler, P. W., & Carrasco, J. M. (2009). Feed-forward space vector modulation for single-phase multilevel cascaded converters with any DC voltage ratio. IEEE Transactions on Industrial Electronics, 56(2), 315-325. https://doi.org/10.1109/TIE.2008.926777

Modulation techniques for multilevel converters can create distorted output voltages and currents if the dc-link voltages are unbalanced. This situation can be avoided if the instantaneous dc voltage error is not taken into account in the modulation... Read More about Feed-forward space vector modulation for single-phase multilevel cascaded converters with any DC voltage ratio.

Three-Dimensional Feedforward Space Vector Modulation Applied to Multilevel Diode-Clamped Converters (2008)
Journal Article
Leon, J. I., Vazquez, S., Portillo, R., Franquelo, L. G., Carrasco, J. M., Wheeler, P. W., & Watson, A. J. (2009). Three-Dimensional Feedforward Space Vector Modulation Applied to Multilevel Diode-Clamped Converters. IEEE Transactions on Industrial Electronics, 56(1), 101-109. https://doi.org/10.1109/TIE.2008.928110

Simplified space vector modulation (SVM) techniques for multilevel converters are being developed to improve factors such as the computational cost, number of commutations, and voltage distortion. The feedforward SVM presented in this paper takes int... Read More about Three-Dimensional Feedforward Space Vector Modulation Applied to Multilevel Diode-Clamped Converters.

Implementation of a hybrid AC-AC direct power converter with unity voltage transfer (2008)
Journal Article
Wijekoon, T., Klumpner, C., Zanchetta, P., & Wheeler, P. (2008). Implementation of a hybrid AC-AC direct power converter with unity voltage transfer. IEEE Transactions on Power Electronics, 23(4), https://doi.org/10.1109/TPEL.2008.924601

This paper presents a novel hybrid direct power converter (HDPC) which overcomes the two main disadvantages of matrix converters: limited voltage transfer ratio and low immunity to grid disturbance. The proposed converter is formed by integrating a r... Read More about Implementation of a hybrid AC-AC direct power converter with unity voltage transfer.

A new three-level sparse indirect matrix converter (2006)
Presentation / Conference Contribution
Klumpner, C., Lee, M. Y., & Wheeler, P. (2006, November). A new three-level sparse indirect matrix converter. Presented at 32nd Annual Conference of IEEE Industrial Electronics Society (IECON 2006), Paris, France

Matrix converters are forced commutated single stage AC/AC direct frequency changers able to achieve sine wave in and out operation by being able to connect any input phase to any output phase via a 3x3 matrix of bi-directional switches. Indirect two... Read More about A new three-level sparse indirect matrix converter.

Superconducting and conventional electromagnetic launch system for civil aircraft assisted take-off
Presentation / Conference Contribution
Bertola, L., Cox, T., Wheeler, P., & Garvey, S. D. Superconducting and conventional electromagnetic launch system for civil aircraft assisted take-off. Presented at IEEE Energy Conversion Congress & Expo

This paper compares three possible linear motor topologies for an electromagnetic launch system to assist civil aircraft take-off. Assisted launch of civil aircraft has the potential of reducing the required runway length, reducing noise and emission... Read More about Superconducting and conventional electromagnetic launch system for civil aircraft assisted take-off.

A new class of hybrid AC/AC direct power converters
Presentation / Conference Contribution
Klumpner, C., Wijekoon, T., & Wheeler, P. A new class of hybrid AC/AC direct power converters. Presented at 2005 IEEE Industry Applications Society Annual Meeting

Variable voltage and variable frequency conversion of electrical energy from an AC source to an AC load is done in traditional power converters via a DC-link where an energy storage element (electrolytic capacitors) is situated. Despite its well-know... Read More about A new class of hybrid AC/AC direct power converters.

A new three-level indirect matrix converter with reduced number of switches
Presentation / Conference Contribution
Klumpner, C., Lee, M. Y., Pitic, C., Wheeler, P., & Zanchetta, P. A new three-level indirect matrix converter with reduced number of switches. Presented at IEEE-IAS 2007 Annual Meeting

Matrix converters are sine wave in/out forced commutated single-stage AC/AC direct frequency changers using a single bi-directional switch to connect any input to any output. Indirect two-stage matrix converters provide similar input and output perfo... Read More about A new three-level indirect matrix converter with reduced number of switches.

A more efficient current source inverter with series connected AC capacitors for photovoltaic and fuel cell applications
Presentation / Conference Contribution
Klumpner, C., Chonlatee, P., & Wheeler, P. A more efficient current source inverter with series connected AC capacitors for photovoltaic and fuel cell applications. Presented at Power Electronics and Inteligent Motion (PCIM) 2009 (ISBN: 978-3-8007-3158-9)

Renewable energy sources such as photovoltaics (PVs) or fuel cells (FCs) are not fitted for direct power grid connection because they deliver DC voltage and current. In addition, they also have a high internal resistance/nonlinear V/I dependence, whi... Read More about A more efficient current source inverter with series connected AC capacitors for photovoltaic and fuel cell applications.

A current source inverter with series connected AC capacitors for photovoltaic application with grid fault ride through capability
Presentation / Conference Contribution
Photong, C., Klumpner, C., & Wheeler, P. A current source inverter with series connected AC capacitors for photovoltaic application with grid fault ride through capability. Presented at 35th Annual Conference of IEEE Industrial Electronics (IECON 2009)

The current source inverter (CSI) is preferred to interface a renewable source such photovoltaics (PV) to the AC power grid because it can provide smooth current source in the DC side, which fits to the PV behaviour and also steps-up the voltage from... Read More about A current source inverter with series connected AC capacitors for photovoltaic application with grid fault ride through capability.

Integrated output filter inductor for permanent magnet motor drives
Presentation / Conference Contribution
Raza Khowja, M., Gerada, C., Vakil, G., Wheeler, P., & Patel, C. Integrated output filter inductor for permanent magnet motor drives. Presented at IECON 2016

This paper presents a novel approach to integrate the output filter inductor in permanent magnet synchronous motor (PMSM) drive system. The integrated output filter inductor is based on utilizing the motor magnetics as a filter inductance instead of... Read More about Integrated output filter inductor for permanent magnet motor drives.