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Implementation of wavelet-based robust differential control for electric vehicle application (2015)
Journal Article
Febin Daya, J., Sanjeevikumar, P., Blaabjerg, F., Wheeler, P., & Ojo Olorunfemi, J. (2015). Implementation of wavelet-based robust differential control for electric vehicle application. IEEE Transactions on Power Electronics, 30(12), https://doi.org/10.1109/TPEL.2015.2440297

This research letter presents the modeling and simulation of electronic differential, employing a novel wavelet controller for two brushless dc motors. The proposed controller uses discrete wavelet transform to decompose the error between actual and... Read More about Implementation of wavelet-based robust differential control for electric vehicle application.

Self-tuning resonant control of a 7-leg back-to-back converter for interfacing variable speed generators to 4-wire loads (2015)
Journal Article
Cardenas, R., Espina, E., Clare, J. C., & Wheeler, P. (2015). Self-tuning resonant control of a 7-leg back-to-back converter for interfacing variable speed generators to 4-wire loads. IEEE Transactions on Industrial Electronics, 62(7), https://doi.org/10.1109/TIE.2015.2409803

This paper considers the control of a 7-leg back-to-back Voltage Source Inverter (VSI) arrangement feeding a 4-wire load from a 3-phase Permanent Magnet Synchronous Generator (PMSG) operating at variable speed. The PMSG is controlled using a sensorle... Read More about Self-tuning resonant control of a 7-leg back-to-back converter for interfacing variable speed generators to 4-wire loads.

Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs (2015)
Journal Article
Trentin, A., De Lillo, L., Empringham, L., Wheeler, P., & Clare, J. C. (2015). Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs. IEEE Journal of Emerging and Selected Topics in Power Electronics, 3(2), https://doi.org/10.1109/JESTPE.2014.2381001

This paper presents an analytical and experimental comparison between comparable Silicon (Si) IGBTs and Silicon Carbide (SiC) MOSFETS when used in a direct AC/AC matrix converter circuit. The switching performance of the two devices is analysed and t... Read More about Experimental comparison of a matrix converter using Si IGBT and SiC MOSFETs.

Multi-objective modulated Model Predictive Control for a multilevel solid state transformer (2015)
Journal Article
Tarisciotti, L., Zanchetta, P., Watson, A. J., Wheeler, P., Clare, J. C., & Bifaretti, S. (2015). Multi-objective modulated Model Predictive Control for a multilevel solid state transformer. IEEE Transactions on Industry Applications, 51(5), https://doi.org/10.1109/TIA.2015.2429113

Finite Control Set Model Predictive Control (FCS-MPC) offers many advantages over more traditional control techniques, such as the ability to avoid cascaded control loops, easy inclusion of constraint and fast transient response of the control system... Read More about Multi-objective modulated Model Predictive Control for a multilevel solid state transformer.

Control of a hybrid modular multilevel converter during grid voltage unbalance (2015)
Presentation / Conference Contribution
Amankwah, E. K., Watson, A., Wheeler, P., & Clare, J. C. Control of a hybrid modular multilevel converter during grid voltage unbalance. Presented at 11th International Conference on AC and DC Power Transmission

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 about Control of a hybrid modular multilevel converter during grid voltage unbalance.

A four-legs matrix converter ground power unit with repetitive voltage control (2014)
Journal Article
Rohuma, W., Zanchetta, P., Wheeler, P., & Empringham, L. (2015). A four-legs matrix converter ground power unit with repetitive voltage control. IEEE Transactions on Industrial Electronics, 62(4), https://doi.org/10.1109/TIE.2014.2379585

In this paper, a four-leg matrix converter is proposed as the power conversion core for aircraft ground power unit (GPU) applications. This structure allows easy management of unbalanced and nonlinear loads with minimal disruption of the power supply... Read More about A four-legs matrix converter ground power unit with repetitive voltage control.

Open circuit fault detection and diagnosis in matrix converters (2014)
Journal Article
Brunson, C., Empringham, L., De Lillo, L., Wheeler, P., & Clare, J. C. (2014). Open circuit fault detection and diagnosis in matrix converters. IEEE Transactions on Power Electronics, 30(5), https://doi.org/10.1109/TPEL.2014.2364152

With the increased use of power electronics in aerospace, automotive, industrial, and energy generation sectors, the demand for highly reliable and power dense solutions has increased. Matrix converters become attractive when taking into account dema... Read More about Open circuit fault detection and diagnosis in matrix converters.

A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI (2014)
Presentation / Conference Contribution
Papadopoulos, S., Rashed, M., Klumpner, C., & Wheeler, P. (2014, September). A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI. Presented at 2014 IEEE Energy Conversion Congress and Exposition (ECCE), Pittsburgh, PA, USA

Hybrid converters consist of a main inverter processing the bulk of the power with poor waveform performance and a fast and versatile auxiliary inverter to correct the distortion. In this paper, the main converter is a medium voltage NPC inverter and... Read More about A hybrid inverter system for medium voltage applications using a low voltage auxiliary CSI.

Power conversion for a novel AC/DC aircraft electrical distribution system (2014)
Journal Article
Trentin, A., Zanchetta, P., Wheeler, P., & Clare, J. C. (2014). Power conversion for a novel AC/DC aircraft electrical distribution system. IET Electrical Systems in Transportation, 4(2), https://doi.org/10.1049/iet-est.2013.0005

This paper proposes a novel and compact AC/DC electrical distribution system for new generation aircraft. In these new aircraft power systems, all loads are fed by two dc bus systems: at 28V and at +/-270V. The electrical distribution system, whose d... Read More about Power conversion for a novel AC/DC aircraft electrical distribution system.

A Simple Current Control Strategy for a Four-Leg Indirect Matrix Converter (2014)
Journal Article
Garcia, C., Rivera, M., Lopez, M., Rodriguez, J., Pena, R., Wheeler, P. W., & Espinoza, J. R. (2015). A Simple Current Control Strategy for a Four-Leg Indirect Matrix Converter. IEEE Transactions on Power Electronics, 30(4), 2275-2287. https://doi.org/10.1109/TPEL.2014.2321562

In this paper, the experimental validation of a predictive current control strategy for a four-leg indirect matrix converter is presented. The four-leg indirect matrix converter can supply energy to an unbalanced three-phase load while providing a pa... Read More about A Simple Current Control Strategy for a Four-Leg Indirect Matrix Converter.

A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF) (2014)
Presentation / Conference Contribution
Papadopoulos, S., Rashed, M., Klumpner, C., & Wheeler, P. A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF). Presented at 2014 IET 7th International Conference on Power Electronics, Machines & Drives (PEMD)

This paper proposes a new hybrid inverter solution for medium/high voltage applications that consists of a slow switching inverter using high voltage or series connected switching devices, fitted with a low kVA rated auxiliary current source inverter... Read More about A hybrid inverter solution for medium voltage applications using series capacitor and a CSI Active Power Filter (SC-APF).

Active DC voltage balancing PWM technique for high-power cascaded multilevel converters (2014)
Journal Article
Tarisciotti, L., Zanchetta, P., Watson, A. J., Bifaretti, S., Clare, J. C., & Wheeler, P. (2014). Active DC voltage balancing PWM technique for high-power cascaded multilevel converters. IEEE Transactions on Industrial Electronics, 61(11), https://doi.org/10.1109/TIE.2014.2308139

In this paper a dedicated PWM technique specifically designed for single-phase (or four wire three-phase) multilevel Cascaded H-Bridge Converters is presented. The aim of the proposed technique is to minimize the DC-Link voltage unbalance, independen... Read More about Active DC voltage balancing PWM technique for high-power cascaded multilevel converters.

DC fault ride-through capability and STATCOM operation of a HVDC hybrid voltage source converter (2014)
Journal Article
Feldman, R., Farr, E., Watson, A. J., Clare, J. C., & Wheeler, P. (2014). DC fault ride-through capability and STATCOM operation of a HVDC hybrid voltage source converter. IET Generation, Transmission and Distribution, 8(1), https://doi.org/10.1049/iet-gtd.2012.0713

HVDC transmission systems are becoming increasingly popular when compared to conventional AC transmission methods. HVDC voltage source converters (VSC) can offer advantages over traditional HVDC current source converter topologies; as such, it is exp... Read More about DC fault ride-through capability and STATCOM operation of a HVDC hybrid voltage source converter.

Experimental and analytical performance evaluation of SiC power devices in the matrix converter (2014)
Journal Article
Safari, S., Castellazzi, A., & Wheeler, P. (2014). Experimental and analytical performance evaluation of SiC power devices in the matrix converter. IEEE Transactions on Power Electronics, 29(5), https://doi.org/10.1109/TPEL.2013.2289746

With the commercial availability of SiC power devices, their acceptance is expected grows in consideration to the excellent low switching loss, high temperature operation and high voltage rating capabilities of these devices. This paper presents the... Read More about Experimental and analytical performance evaluation of SiC power devices in the matrix converter.

Fault detection for modular multilevel converters based on sliding mode observer (2013)
Journal Article
Shao, S., Wheeler, P., Clare, J. C., & Watson, A. J. (2013). Fault detection for modular multilevel converters based on sliding mode observer. IEEE Transactions on Power Electronics, 28(11), https://doi.org/10.1109/TPEL.2013.2242093

This letter presents a fault detection method for modular multilevel converters (MMC) which is capable of lo¬cating a faulty semiconductor switching device in the circuit. The proposed fault detection method is based on a sliding mode observer (SMO)... Read More about Fault detection for modular multilevel converters based on sliding mode observer.

Space-vector-modulated three-level inverters with a single Z-source network (2012)
Journal Article
Effah, F. B., Wheeler, P., Clare, J. C., & Watson, A. J. (in press). Space-vector-modulated three-level inverters with a single Z-source network. IEEE Transactions on Power Electronics, 28(6), https://doi.org/10.1109/TPEL.2012.2219627

The Z-source inverter is a relatively recent converter topology that exhibits both voltage-buck and voltage-boost capability. The Z-source concept can be applied to all dc-to-ac, ac-to-dc, ac-to-ac, and dc-to-dc power conversion whether two-level or... Read More about Space-vector-modulated three-level inverters with a single Z-source network.

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.

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.