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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.

Control and Experimental Validation of the Series Bridge Modular Multilevel Converter for HVDC Applications (2019)
Journal Article
Martinez Diez, C., Costabeber, A., Tardelli, F., Trainer, D., & Clare, J. (2019). Control and Experimental Validation of the Series Bridge Modular Multilevel Converter for HVDC Applications. IEEE Transactions on Power Electronics, 35(3), 2389-2401. https://doi.org/10.1109/tpel.2019.2929862

© 1986-2012 IEEE. The series bridge converter (SBC) is a modular multilevel converter (MMC) recently developed to enhance power density in high-voltage high-power applications. The MMC is a well-established solution, widely researched, and exploited... Read More about Control and Experimental Validation of the Series Bridge Modular Multilevel Converter for HVDC Applications.

Vector control of a modular multilevel matrix converter operating over the full output-frequency range (2018)
Journal Article
Diaz, M., Cardenas, R., Espinoza, M., Hackl, C. M., Rojas, F., Clare, J. C., & Wheeler, P. (2019). Vector control of a modular multilevel matrix converter operating over the full output-frequency range. IEEE Transactions on Industrial Electronics, 66(7), 5102-5114. https://doi.org/10.1109/tie.2018.2870367

The Modular Multilevel Matrix Converter ( M 3 C ) is an ac-to-ac converter topology suitable for the control of high-power variable-speed drives. The control of this converter is complex, particularly when the two ac system frequencies are similar o... Read More about Vector control of a modular multilevel matrix converter operating over the full output-frequency range.

A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC Converters (2018)
Journal Article
Nasir, U., Costabeber, A., Rivera, M., Wheeler, P., & Clare, J. (2019). A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC Converters. IEEE Journal of Emerging and Selected Topics in Power Electronics, 7(1), 467-479. https://doi.org/10.1109/jestpe.2018.2861326

© 2013 IEEE. This paper proposes a generalized commutation strategy suitable for matrix-based isolated ac/ac conversion stages in solid-state transformers for use whenever there is nonnegligible leakage inductance in the isolation transformer. The st... Read More about A Leakage-Inductance-Tolerant Commutation Strategy for Isolated AC/AC 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.

An integrated converter and machine control system for MMC-based high-power drives (2018)
Journal Article
Espinoza-B, M., Cárdenas, R., Clare, J., Soto-Sanchez, D., Diaz, M., Espina, E., & Hackl, C. (2019). An integrated converter and machine control system for MMC-based high-power drives. IEEE Transactions on Industrial Electronics, 66(3), 2343-2354. https://doi.org/10.1109/TIE.2018.2801839

© 2018 IEEE. The modular multilevel converter (MMC) is a promising topology for high-power drive applications. However, large voltage fluctuations can be produced in the floating capacitors when the machine operates with high stator currents at low r... Read More about An integrated converter and machine control system for MMC-based high-power drives.

A study on probability of distribution loads based on expectation maximization algorithm (2017)
Conference Proceeding
Ganjavi, A., Christopher, E., Johnson, C. M., & Clare, J. (2017). A study on probability of distribution loads based on expectation maximization algorithm. In IEEE Power and Energy Society Innovative Smart Grid Technologies Conference, ISGT 2017 (1-5). https://doi.org/10.1109/ISGT.2017.8086037

In a distribution power network, the load model has no certain pattern or predicted behaviour due to large range of data and changes in energy consumption for end-user consumers. Thus, a powerful analysis based on probabilistic structure is required.... Read More about A study on probability of distribution loads based on expectation maximization algorithm.

Control and grid integration of MW-range wind and solar energy conversion systems (2017)
Journal Article
Cardenas, R., Perez, M., & Clare, J. C. (2017). Control and grid integration of MW-range wind and solar energy conversion systems. IEEE Transactions on Industrial Electronics, 64(11), 8786-8789. https://doi.org/10.1109/TIE.2017.2745759

The papers in this special section focus on control and power grid integration of MW-range wind and solar energy conversion systems. Globally, the energy provided by intermittent sources has been steadily increasing. For instance, the electrical ener... Read More about Control and grid integration of MW-range wind and solar energy conversion systems.

ESBC: an enhanced modular multilevel converter with H-bridge front end (2017)
Conference Proceeding
Amankwah, E., Costabeber, A., Jasim, O., Trainer, D., & Clare, J. C. (2017). ESBC: an enhanced modular multilevel converter with H-bridge front end.

This paper presents the Enhanced Series Bridge Converter (ESBC), a hybrid modular multilevel converter with H-bridge front end suitable for high power grid applications. It retains the advantages of other modular multilevel topologies while offering... Read More about ESBC: an enhanced modular multilevel converter with H-bridge front end.

A new analysis for finding the optimum power rating of low voltage distribution power electronics based on statistics and probabilities (2017)
Conference Proceeding
Ganjavi, A., Christopher, E., Johnson, C. M., & Clare, J. C. (2017). A new analysis for finding the optimum power rating of low voltage distribution power electronics based on statistics and probabilities.

The continuing trend toward heavier load and high penetration of Distribution Generation (DG) units in low voltage rural distribution feeders requires power electronic-based solution alternatives for voltage regulation purposes. The design of power e... Read More about A new analysis for finding the optimum power rating of low voltage distribution power electronics based on statistics and probabilities.

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.

Control of wind energy conversion systems based on the Modular Multilevel Matrix converter (2017)
Journal Article
Diaz, M., Cardenas, R., Espinoza, M., Mora, A., Rojas, F., Clare, J. C., & Wheeler, P. (2017). Control of wind energy conversion systems based on the Modular Multilevel Matrix converter. IEEE Transactions on Industrial Electronics, 64(11), 8799-8810. https://doi.org/10.1109/TIE.2017.2733467

The nominal power of single Wind Energy Conversion Systems (WECS) has been steadily growing, reaching power ratings close to 10MW. In the power conversion stage, medium-voltage power converters are replacing the conventional low-voltage back-to-back... Read More about Control of wind energy conversion systems based on the Modular Multilevel Matrix converter.

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.

Vector control of an open-ended winding induction machine based on a two-output indirect matrix converter (2017)
Journal Article
Riedemann, J., Clare, J. C., Wheeler, P., Blasco Giménez, R., Cardenas, R., & Pena, R. (in press). Vector control of an open-ended winding induction machine based on a two-output indirect matrix converter. Epe Journal, https://doi.org/10.1080/09398368.2016.1261457

The open-ended winding induction machine fed from a standard two-level Voltage Source Inverter (VSI) arrangement is an attractive solution for AC drives. An alternative power converter approach is to use an Indirect Matrix Converter (IMC) consisting... Read More about Vector control of an open-ended winding induction machine based on a two-output indirect matrix converter.

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.

An enhanced dq-based vector control system for modular multilevel converters feeding variable speed drives (2016)
Journal Article
Espinoza, M., Cardenas, R., Diaz, M., & Clare, J. C. (2017). An enhanced dq-based vector control system for modular multilevel converters feeding variable speed drives. IEEE Transactions on Industrial Electronics, 64(4), 2620-2630. https://doi.org/10.1109/TIE.2016.2637894

Modular multilevel converters (M2C) are considered an attractive solution for high power drive applications. However, energy balancing within the converter is complex to achieve, particularly when the machine is operating at low rotational speeds. In... Read More about An enhanced dq-based vector control system for modular multilevel converters feeding variable speed drives.

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.

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.