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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)
Conference Proceeding
Hassan, Z., Costabeber, A., Tardelli, F., Watson, A., & Clare, J. (2019). A Parallel Connected Unfolding Bridge (PCUB) Multilevel Converter for HVDC Applications. In IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society (5703-5708). https://doi.org/10.1109/IECON.2019.8927297

© 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., …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)
Conference Proceeding
Li, Z., Wheeler, P., Watson, A., Costabeber, A., Bai, Z., Zhang, X., …Ma, H. (2019). A Nonintrusive IGBT Open-Circuit Fault and Current Sensor Fault Diagnosis Method for Grid-Tied Three-phase Three-Wire Inverter with Two Current Sensors. In 2019 IEEE Energy Conversion Congress and Exposition (ECCE) (2963-2967). https://doi.org/10.1109/ECCE.2019.8912813

© 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)
Conference Proceeding
Saleh, B. M., Costabeber, A., Watson, A., Tardelli, F., & Clare, J. (2019). A New Capacitor Voltage Balancing Method for Trapezoidal Operation of Modular Multilevel DC-DC Converters. In 2019 21st European Conference on Power Electronics and Applications (EPE '19 ECCE Europe) (1-9). https://doi.org/10.23919/EPE.2019.8915177

© 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.

Design considerations for a high-power dual active bridge DC-DC converter with galvanically isolated transformer (2017)
Conference Proceeding
Lee, Y., Watson, A. J., Vakil, G., & Wheeler, P. (2017). Design considerations for a high-power dual active bridge DC-DC converter with galvanically isolated transformer. In 2017 IEEE Energy Conversion Congress and Exposition (ECCE) (4531-4537). https://doi.org/10.1109/ECCE.2017.8096777

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.

Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA isolated DC-DC converter (2017)
Conference Proceeding
Lee, Y., Vakil, G., Watson, A. J., & Wheeler, P. (2017). Geometry optimization and characterization of three-phase medium frequency transformer for 10kVA isolated DC-DC converter. In 2017 IEEE Energy Conversion Congress and Exposition (ECCE) (511-518). https://doi.org/10.1109/ECCE.2017.8095826

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.

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)
Conference Proceeding
Effah, F. B., Wheeler, P., Watson, A. J., & Clare, J. C. (2017). Quasi Z-source NPC inverter for PV application. In Proceedings of 2017 IEEE PES PowerAfrica (153-158). https://doi.org/10.1109/PowerAfrica.2017.7991215

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)
Conference Proceeding
Tang, Y., Watson, A., Wheeler, P., Farr, E., & Feldman, R. (2017). A novel multi-modular series HVDC tap. In 13th IET International Conference on AC and DC Power Transmission (ACDC 2017) (1-6). https://doi.org/10.1049/cp.2017.0044

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.

Submodule power losses balancing algorithms for the modular multilevel converter (2016)
Conference Proceeding
Picas, R., Pou, J., Zaragoza, J., Watson, A., Konstantinou, G., Ceballos, S., & Clare, J. (2016). Submodule power losses balancing algorithms for the modular multilevel converter. In IECON 2016 Proceedings - 42nd Annual Conference of the IEEE Industrial Electronics Society (5064-5069). https://doi.org/10.1109/IECON.2016.7793381

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.

Control of a modular multilevel converter with pulsed DC load (2016)
Conference Proceeding
Jankovic, M., Watson, A., Costabeber, A., & Clare, J. (2016). Control of a modular multilevel converter with pulsed DC load. In 2016 IEEE Energy Conversion Congress and Exposition (ECCE) (1-8). https://doi.org/10.1109/ECCE.2016.7854963

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.

A novel full soft-switching resonant power converter for mid-feeder voltage regulation of low voltage distribution network (2016)
Conference Proceeding
Ji, C., Watson, A. J., Clare, J. C., & Johnson, C. M. (2016). A novel full soft-switching resonant power converter for mid-feeder voltage regulation of low voltage distribution network. In 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) (1-6). https://doi.org/10.1109/EPE.2016.7695398

This paper presents a novel resonant based, high power density power electronics converter solution for mid-feeder voltage regulation of a low voltage (LV) distribution network. Owing to the use of high switching frequency operation and a full soft-s... Read More about A novel full soft-switching resonant power converter for mid-feeder voltage regulation of low voltage distribution network.

A high-power DC-DC converter based dual active bridge for MVDC grids on offshore wind farms (2016)
Conference Proceeding
Lee, Y., Vakil, G., Feldman, R., Watson, A. J., & Wheeler, P. (2016). A high-power DC-DC converter based dual active bridge for MVDC grids on offshore wind farms. In 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) (1-10). https://doi.org/10.1109/EPE.2016.7695573

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.

Design and implementation of magnetron power supply and emulator (2016)
Conference Proceeding
Abodhir, N., Watson, A. J., Ji, C., & Clare, J. C. (in press). Design and implementation of magnetron power supply and emulator. In 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) (1-10). https://doi.org/10.1109/EPE.2016.7695318

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.

Novel current-limiting strategy for solid-state circuit breakers (SSCB) without additional impedance (2016)
Conference Proceeding
Gu, C., Effah, F. B., Castellazzi, A., Watson, A. J., & Wheeler, P. (2016). Novel current-limiting strategy for solid-state circuit breakers (SSCB) without additional impedance. In 2016 18th European Conference on Power Electronics and Applications (EPE'16 ECCE Europe) (1-10). https://doi.org/10.1109/EPE.2016.7695675

Current-limiting strategies for solid-state circuit breaker (SSCB) without adding impedance is introduced in this paper. With the current limitation of novel phase-shifting method, the advantages are simple hardware structure, relatively low cost, no... Read More about Novel current-limiting strategy for solid-state circuit breakers (SSCB) without additional impedance.

A survey on configurations of current-limiting circuit breakers (CL-CB) (2016)
Conference Proceeding
Gu, C., Wheeler, P., Castellazzi, A., Watson, A. J., & Effah, F. B. (2016). A survey on configurations of current-limiting circuit breakers (CL-CB).

This paper presents a survey of topology configurations of current-limiting circuit breakers. Twelve different current-limiting topologies within four categories are detailed discussed and compared. It is concluded that active CL-CB may be a good cho... Read More about A survey on configurations of current-limiting circuit breakers (CL-CB).