All Outputs (82)

Asymmetrical Triangular Current Mode (ATCM) for Bidirectional High Step Ratio Modular Multilevel Dc–Dc Converter (2019)
Journal Article
Pineda, C., Pereda, J., Rojas, F., Cerda, C., Zhang, X., & J. Watson, A. (2020). Asymmetrical Triangular Current Mode (ATCM) for Bidirectional High Step Ratio Modular Multilevel Dc–Dc Converter. IEEE Transactions on Power Electronics, 35(7), 6906-6915. https://doi.org/10.1109/tpel.2019.2957951

Direct current (Dc) networks have proven advantages in high voltage direct current (HVDC) transmission systems, and now they are expanding to medium- and low-voltage distribution networks. One of the major challenges is to develop reliable dc-dc volt... Read More about Asymmetrical Triangular Current Mode (ATCM) for Bidirectional High Step Ratio Modular Multilevel Dc–Dc Converter.

A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications (2019)
Presentation / Conference Contribution
Hassan, Z., Costabeber, A., Tardelli, F., Watson, A., & Clare, J. (2019, October). A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications. Presented at 45th Annual Conference of the IEEE Industrial Electronics Society (IECON 2019 ), Lisbon, Portugal

© 2019 IEEE. Hybrid Voltage Source Converters (VSC), that combine the conventional three-level VSCs and Modular Multilevel Chain-Links (CLs), offer a promising solution for future HVDC stations, achieving reduced footprint with respect to the MMC whi... Read More about A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications.

A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors (2019)
Journal Article
Li, Z., Wheeler, P., Watson, A., Costabeber, A., Wang, B., Ren, Y., Bai, Z., & Ma, H. (2020). A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors. IEEE Transactions on Power Electronics, 35(5), 5267-5278. https://doi.org/10.1109/tpel.2019.2946692

© 1986-2012 IEEE. This article considers fault detection in the case of a three-phase three-wire (3P3W) inverter, when only two current sensors are used to save cost or due to a faulty current sensor. With two current sensors, there is no current met... Read More about A Fast Diagnosis Method for Both IGBT Faults and Current Sensor Faults in Grid-Tied Three-Phase Inverters With Two Current Sensors.

A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors (2019)
Presentation / Conference Contribution
Li, Z., Wheeler, P., Watson, A., Costabeber, A., Bai, Z., Zhang, X., Zhao, B., & Ma, H. (2019, September). A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors. Presented at 2019 IEEE Energy Conversion Congress and Exposition (ECCE), Baltimore, MD, USA

© 2019 IEEE. In some cases, only two current sensors are available in three-phase three-wire (3P3W) inverters. This occurs when one of three sensors is faulty, or the inverter is equipped with only two sensors to save cost. There has been no method a... Read More about A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors.

A New Capacitor Voltage Balancing Method for Trapezoidal Operation of Modular Multilevel DC-DC Converters (2019)
Presentation / Conference Contribution
Saleh, B. M., Costabeber, A., Watson, A., Tardelli, F., & Clare, J. (2019, September). A New Capacitor Voltage Balancing Method for Trapezoidal Operation of Modular Multilevel DC-DC Converters. Presented at 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe), Genova, Italy

© 2019 EPE Association. In this paper, a new submodule (SM) capacitor voltage balancing algorithm is proposed for the trapezoidal operation of a Modular Multilevel DC-DC converter (MMC-DC-DC) for HVDC/MVDC. Trapezoidal wave-shaping leads to SM switch... Read More about A New Capacitor Voltage Balancing Method for Trapezoidal Operation of Modular Multilevel DC-DC Converters.

MMC front-end for klystron modulators: an augmented modulation scheme for arm balancing (2018)
Journal Article
Jankovic, M., Costabeber, A., Watson, A. J., Clare, J. C., & Aguglia, D. (2018). MMC front-end for klystron modulators: an augmented modulation scheme for arm balancing. IEEE Transactions on Plasma Science, 46(10), 3325-3333. https://doi.org/10.1109/TPS.2018.2837619

This paper discusses the control of a Modular Multilevel Converter (MMC) used as a grid-interface for the klystron modulators in the Compact Linear Collider (CLIC). The converter has a DC side load which takes short-duration power pulses, causing hig... Read More about MMC front-end for klystron modulators: an augmented modulation scheme for arm balancing.

A modified virtual space vector modulation technique for Z-source NPC inverters (2018)
Journal Article
Effah, F., Okyere, P., Patrick, W., Alan, W., & Clare, J. (2018). A modified virtual space vector modulation technique for Z-source NPC inverters. Carpathian Journal of Electrical Engineering, 12(1), 99--113

A modified virtual space vector modulation approach for the control of a Z-source neutral point clamped inverter is presented in this paper. This approach works perfectly for the traditional neutral point clamped inverter. In this paper, the effectiv... Read More about A modified virtual space vector modulation technique for Z-source NPC inverters.

Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA isolated DC-DC converter (2017)
Presentation / Conference Contribution
Lee, Y., Vakil, G., Watson, A. J., & Wheeler, P. (2017, October). Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA isolated DC-DC converter. Presented at IEEE Energy Conversion Congress and Exposition (ECCE) 2017, Cincinnati, OH, USA

Three-phase Dual Active Bridge converter is advisable for the High-power DC-DC conversion system.

In the ac link, galvanically isolated transformer operated at a medium frequency range provides stepping up or down of the secondary bridge voltage.... Read More about Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA isolated DC-DC converter.

Design considerations for a high-power dual active bridge DC-DC converter with galvanically isolated transformer (2017)
Presentation / Conference Contribution
Lee, Y., Watson, A. J., Vakil, G., & Wheeler, P. (2017, October). Design considerations for a high-power dual active bridge DC-DC converter with galvanically isolated transformer. Presented at 2017 IEEE Energy Conversion Congress and Exposition (ECCE), Cincinnati, OH, USA

Multi-megawatt scale isolated DC-DC converters are likely to become increasingly popular as means to interconnect the MVDC grids of different voltage levels. Three-phase dual active bridge DC-DC (3DAB) converters operating with the zero-voltage switc... Read More about Design considerations for a high-power dual active bridge DC-DC converter with galvanically isolated transformer.

The Alternate Arm Converter (AAC) - "short-overlap" mode operation - analysis and design parameter selection (2017)
Journal Article
Farr, E., Feldman, R., Clare, J. C., Watson, A. J., & Wheeler, P. (2018). The Alternate Arm Converter (AAC) - "short-overlap" mode operation - analysis and design parameter selection. IEEE Transactions on Power Electronics, 33(7), 5641-5659. https://doi.org/10.1109/TPEL.2017.2742899

This paper presents converter operation principles and theoretical analyses for “short-overlap” mode operation of the Alternate Arm Converter (AAC), which is a type of modular multilevel Voltage Source Converter (VSC) that has been proposed for HVDC... Read More about The Alternate Arm Converter (AAC) - "short-overlap" mode operation - analysis and design parameter selection.

Quasi Z-source NPC inverter for PV application (2017)
Presentation / Conference Contribution
Effah, F. B., Wheeler, P., Watson, A. J., & Clare, J. C. (2017, June). Quasi Z-source NPC inverter for PV application. Presented at 2017 IEEE PES-IAS PowerAfrica Conference: Harnessing Energy, Information and Communications Technology (ICT) for Affordable Electrification of Africa, PowerAfrica 2017, Accra, Greece

This paper presents the operating principles and modified space vector modulation strategy for a three-phase quasi Z-source neutral point clamped inverter for solar photovoltaic applications. This topology combines the advantages of the neutral point... Read More about Quasi Z-source NPC inverter for PV application.

Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load (2017)
Journal Article
Jankovic, M., Costabeber, A., Watson, A. J., & Clare, J. C. (2017). Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load. IEEE Transactions on Industrial Electronics, 64(12), 9180-9190. https://doi.org/10.1109/TIE.2017.2711516

This paper focuses on the operation of a grid connected Modular Multilevel Converter (MMC) supplying a pulsed DC load. The goal is to achieve minimum AC power fluctuation despite the high power fluctuation present on the DC side. The MMC has been sel... Read More about Arm-Balancing Control and Experimental Validation of a Grid-Connected MMC With Pulsed DC Load.

A novel multi-modular series HVDC tap (2017)
Presentation / Conference Contribution
Tang, Y., Watson, A., Wheeler, P., Farr, E., & Feldman, R. (2017, February). A novel multi-modular series HVDC tap. Presented at 13th IET International Conference on AC and DC Power Transmission, ACDC 2017, Manchester, UK

Tapping energy from a HVDC transmission line to serve small remote communities has been considered by researchers and HVDC manufacturers since the 1960s. Many HVDC taps proposed consider the performance of diodes, Thyristors and GTOs and the utilizat... Read More about A novel multi-modular series HVDC tap.

Semiconductor devices in solid-state/hybrid circuit breakers: current status and future trends (2017)
Journal Article
Gu, C., Wheeler, P., Castellazzi, A., Watson, A. J., & Effah, F. (2017). Semiconductor devices in solid-state/hybrid circuit breakers: current status and future trends. Energies, 10(4), Article 495. https://doi.org/10.3390/en10040495

Circuit breakers (CBs) are the main protection devices for both alternating current (AC) and direct current (DC) power systems, ranging from tens of watts up to megawatts. This paper reviews the current status for solid-state circuit breakers (SSCBs)... Read More about Semiconductor devices in solid-state/hybrid circuit breakers: current status and future trends.

Control of a modular multilevel converter with pulsed DC load (2016)
Presentation / Conference Contribution
Jankovic, M., Watson, A., Costabeber, A., & Clare, J. (2016, September). Control of a modular multilevel converter with pulsed DC load. Presented at 2016 IEEE Energy Conversion Congress and Exposition (ECCE), Milwaukee, WI, USA

This paper focuses on a Modular Multilevel Converter grid interface for a klystron modulator system that behaves as a pulsed DC load. With such a load, and without mitigating control, the MMC suffers from cell capacitor voltage imbalance between the... Read More about Control of a modular multilevel converter with pulsed DC load.

Submodule power losses balancing algorithms for the modular multilevel converter (2016)
Presentation / Conference Contribution
Picas, R., Pou, J., Zaragoza, J., Watson, A., Konstantinou, G., Ceballos, S., & Clare, J. (2016, October). Submodule power losses balancing algorithms for the modular multilevel converter. Presented at 42nd Annual Conference of IEEE Industrial Electronics Society (IECON 2016), Florence, Italy

Tolerance and component aging can cause significant differences in the capacitance values of the submodules (SMs) in a modular multilevel converter (MMC). Depending on the modulation technique, capacitance mismatches may produce uneven switching tran... Read More about Submodule power losses balancing algorithms for the modular multilevel converter.

The Series Bridge Converter (SBC): Design of a compact modular multilevel converter for grid applications (2016)
Presentation / Conference Contribution
Amankwah, E. K., Costabeber, A., Watson, A., Trainer, D., Jasim, O., Chivite-Zabalza, J., & Clare, J. (2016, October). The Series Bridge Converter (SBC): Design of a compact modular multilevel converter for grid applications. Presented at 42nd Annual Conference of IEEE Industrial Electronics Society (IECON 2016), Florence, Italy

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 about The Series Bridge Converter (SBC): Design of a compact modular multilevel converter for grid applications.

A high-power DC-DC converter based dual active bridge for MVDC grids on offshore wind farms (2016)
Presentation / Conference Contribution
Lee, Y., Vakil, G., Feldman, R., Watson, A. J., & Wheeler, P. (2016, September). A high-power DC-DC converter based dual active bridge for MVDC grids on offshore wind farms. Presented at 2016 18th European Conference on Power Electronics and Applications, EPE 2016 ECCE Europe, Karlsruhe, Germany

This paper presents the steady-state analysis of a high power step-up DC-DC converter based three-phase dual active bridge (3DAB) for use as a medium voltage (MV) DC-DC collector of offshore wind farms. An optimization procedure for a high-power medi... Read More about A high-power DC-DC converter based dual active bridge for MVDC grids on offshore wind farms.

The Series Bridge Converter (SBC): A hybrid modular multilevel converter for HVDC applications (2016)
Presentation / Conference Contribution
Amankwah, E. K., Costabeber, A., Watson, A., Trainer, D., Jasim, O., Chivite-Zabalza, J., & Clare, J. (2016, September). The Series Bridge Converter (SBC): A hybrid modular multilevel converter for HVDC applications. Presented at 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe), Karlsruhe, Germany

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 about The Series Bridge Converter (SBC): A hybrid modular multilevel converter for HVDC applications.

Design and implementation of magnetron power supply and emulator (2016)
Presentation / Conference Contribution
Abodhir, N., Watson, A. J., Ji, C., & Clare, J. C. (2019, September). Design and implementation of magnetron power supply and emulator. Presented at 2016 18th European Conference on Power Electronics and Applications, EPE 2016 ECCE Europe, Karlsruhe, Germany

The paper presents a novel resonant based high performance power converter solution for industrial magnetron systems. Based the characteristics of the magnetron, an emulator prototype is also proposed to represent the magnetron load behaviour in a la... Read More about Design and implementation of magnetron power supply and emulator.