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A Method to Determine the Torque Ripple Harmonic Reduction in Skewed Synchronous Reluctance Machines (2023)
Journal Article
Gallardo, C., Madariaga, C., Tapia, J. A., & Degano, M. (2023). A Method to Determine the Torque Ripple Harmonic Reduction in Skewed Synchronous Reluctance Machines. Applied Sciences, 13(5), 2949. https://doi.org/10.3390/app13052949

In this paper, a discrete skew methodology is presented to understand the effect of skewing angle on electromagnetic torque in SynRM design. A new approach is proposed to estimate the amplitude of each torque ripple component as a function of skewing... Read More about A Method to Determine the Torque Ripple Harmonic Reduction in Skewed Synchronous Reluctance Machines.

Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation (2023)
Journal Article
Zhou, X., Choy, W. J., Alcaide, A. M., Wang, S., Guenter, S., Leon, J. I., Monopoli, V. G., Franquelo, L. G., Liserre, M., Galea, M., Gerada, C., & Buticchi, G. (2023). Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation. Energies, 16(5), Article 2098. https://doi.org/10.3390/en16052098

This paper investigates the influence of a constant carrier phase shift on the DC-link capacitor harmonic current of cascaded converters used in fuel-cell and mild-hybrid electric vehicles. In these applications, a DC-DC converter can be adopted betw... Read More about Common DC-Link Capacitor Harmonic Current Minimization for Cascaded Converters by Optimized Phase-Shift Modulation.

Fixed-Switching-Frequency Modulated Model Predictive Control for Islanded AC Microgrid Applications (2023)
Journal Article
Villalón, A., Muñoz, C., Muñoz, J., & Rivera, M. (2023). Fixed-Switching-Frequency Modulated Model Predictive Control for Islanded AC Microgrid Applications. Mathematics, 11(3), Article 672. https://doi.org/10.3390/math11030672

In this paper, a fixed-switching-frequency modulated model predictive control (M (Formula presented.) PC) is established for a two-level three-phase voltage source inverter (VSI) working in an islanded AC microgrid. These small-scale power systems ar... Read More about Fixed-Switching-Frequency Modulated Model Predictive Control for Islanded AC Microgrid Applications.

Optimal Location and Sizing of Distributed Generators and Energy Storage Systems in Microgrids: A Review (2022)
Journal Article
Grisales-Noreña, L. F., Restrepo-Cuestas, B. J., Cortés-Caicedo, B., Montano, J., Rosales-Muñoz, A. A., & Rivera, M. (2023). Optimal Location and Sizing of Distributed Generators and Energy Storage Systems in Microgrids: A Review. Energies, 16(1), Article 106. https://doi.org/10.3390/en16010106

This article reviews the main methodologies employed for the optimal location, sizing, and operation of Distributed Generators (DGs) and Energy Storage Systems (ESSs) in electrical networks. For such purpose, we first analyzed the devices that compri... Read More about Optimal Location and Sizing of Distributed Generators and Energy Storage Systems in Microgrids: A Review.

Research on a Three-Coil Hybrid IPT Charger with Improved Tolerance to Coupling Variation and Load-Independent Output (2022)
Journal Article
Wang, Y., Liu, H., Wu, F., Wheeler, P., Zhou, Q., & Zhao, S. (2023). Research on a Three-Coil Hybrid IPT Charger with Improved Tolerance to Coupling Variation and Load-Independent Output. IEEE Journal of Emerging and Selected Topics in Industrial Electronics, 4(2), 625-636. https://doi.org/10.1109/JESTIE.2022.3231234

With the purpose of improving the reliability of inductive power transfer (IPT) system, a three-coil hybrid IPT topology with improved tolerance to coupling variation and load-independent output is presented, which can ensure constant output of the s... Read More about Research on a Three-Coil Hybrid IPT Charger with Improved Tolerance to Coupling Variation and Load-Independent Output.

Advanced Integrated Power Centre with Electric Power Transfer Capability (2022)
Presentation / Conference Contribution
Bozhko, S., & Wheeler, P. (2021, May). Advanced Integrated Power Centre with Electric Power Transfer Capability. Presented at AVT-357 Research Workshop on Technologies for future distributed engine control systems (DECS, virtual

This paper proposes an advanced integrated power generation centre for future more electric aircraft. To fully exploit the power supply ability of the twin-spool engine, a dual-generator configuration is applied, where a starter/generator is coupled... Read More about Advanced Integrated Power Centre with Electric Power Transfer Capability.

An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer (2022)
Presentation / Conference Contribution
Li, D., Gu, C., Wang, S., Zhang, H., Gerada, C., Camilleri, R., & Zhang, Y. (2022, October). An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer. Presented at 2022 IEEE Transportation Electrification Conference and Expo, Asia-Pacific (ITEC Asia-Pacific), Haining, China

PM-Assisted synchronous reluctance machines (PMSynRM) show large speed fluctuations and poor dynamic response when encountering a large disturbance. Additionally, the PI controller is not capable of eliminating steady-state errors when disturbances a... Read More about An Improved Control Strategy of PM-Assisted Synchronous Reluctance Machines Based on an Extended State Observer.

Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region (2022)
Journal Article
Xu, Z., & Gerada, C. (2022). Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region. Energy Reports, 8(Suppl 15), 650-657. https://doi.org/10.1016/j.egyr.2022.10.166

Control of interior permanent magnet synchronous motors (IPMSMs) has been extensively attempted without any position sensor. At extremely low speeds, sensorless operation would not rely on the fundamental model-based sensorless methods since the situ... Read More about Sensorless control of IPMSM using a discrete-time super twisting observer by high-frequency current injection in low speed region.

Dynamic power decoupling for low-voltage ride-through of grid-forming inverters (2022)
Journal Article
Ji, F., Xu, Z., & Gerada, C. (2022). Dynamic power decoupling for low-voltage ride-through of grid-forming inverters. Energy Reports, 8(Supplement 15), 247-258. https://doi.org/10.1016/j.egyr.2022.10.083

In grid-forming technologies, the power controllers emulate the operation of synchronous generator. The frequency regulation, power-decoupling and virtual inertia are mostly achieved on the basis of small-signal models. However, the transient power a... Read More about Dynamic power decoupling for low-voltage ride-through of grid-forming inverters.

Mitigation of AC Winding Losses for Aircraft Propulsion Motors (2022)
Presentation / Conference Contribution
Hebala, A., Nuzzo, S., Connor, P. H., Volpe, G., Gerada, C., & Galea, M. (2022, October). Mitigation of AC Winding Losses for Aircraft Propulsion Motors. Presented at IECON 2022 – 48th Annual Conference of the IEEE Industrial Electronics Society, Brussels, Belgium

In this paper, the AC copper losses are investigated and mitigated for different permanent magnet synchronous motor designs. AC copper losses can represent a substantial share of the total loss in electrical machines. In an application such as aerosp... Read More about Mitigation of AC Winding Losses for Aircraft Propulsion Motors.

Simplified model predictive current control based on fast vector selection method in a VIENNA rectifier (2022)
Journal Article
Song, W., Yang, Y., Jiao, Z., Xu, S., Dang, C., & Wheeler, P. (2023). Simplified model predictive current control based on fast vector selection method in a VIENNA rectifier. IET Power Electronics, 16(3), 436-446. https://doi.org/10.1049/pel2.12395

This paper presents a simplified finite-control-set model predictive control (S-FCS-MPC) based on fast vector selection method in a three-level VIENNA rectifier. This method features a high-power factor, a low input current THD as a well-controlled D... Read More about Simplified model predictive current control based on fast vector selection method in a VIENNA rectifier.

Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine (2022)
Journal Article
Dong, Z., Yan, L., & Gerada, C. (2022). Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine. Guidance, Navigation and Control, 02(03), Article 2250011. https://doi.org/10.1142/s273748072250011x

Six-phase permanent magnet synchronous machine and the control system are also widely used in industry, precision instruments and aerospace. However, most PMSMs employ magnet patterns either in alternatively radial magnetization or Halbach array, whi... Read More about Magnetic Field and Radial Force Analysis of Six-Phase Rotary Machine.

Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators (2022)
Journal Article
He, Y.-L., Qiu, M.-H., Yuan, X.-H., He, X.-L., Wang, H.-P., Jiang, M.-Y., Gerada, C., & Wan, S.-T. (2022). Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators. Machines, 10(6), Article 432. https://doi.org/10.3390/machines10060432

This paper studies the electromechanical characteristics of synchronous generators under dynamic stator interturn short circuit (DSISC). First, the air gap magnetic flux density (MFD) of the generator under normal and DSISC fault was obtained. Then,... Read More about Electromechanical Characteristics Analysis under DSISC Fault in Synchronous Generators.

FCS–MPC with Nonlinear Control Applied to a Multicell AFE Rectifier (2022)
Journal Article
Espinosa, E., Espinoza, J., Melín, P., Rohten, J., Rivera, M., & Muñoz, J. (2022). FCS–MPC with Nonlinear Control Applied to a Multicell AFE Rectifier. Sensors, 22(11), Article 4100. https://doi.org/10.3390/s22114100

The use of controlled power converters has been extended for high power applications, stacking off-the-shelve semiconductors, and allowing the implementation of, among others, AC drives for medium voltages of 2.3 kV to 13.8 kV. For AC drives based on... Read More about FCS–MPC with Nonlinear Control Applied to a Multicell AFE Rectifier.

Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators (2022)
Journal Article
He, Y., Qiu, M., Yuan, X., Wang, H., Jiang, M., Gerada, C., & Wan, S. (2022). Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators. Energies, 15(10), Article 3821. https://doi.org/10.3390/en15103821

This paper analyzes the electromagnetic torque (EMT) fluctuation characteristics in synchronous generators under rotor interturn short-circuit (DRISC) fault. The novelty of this paper is that the DRISC fault is proposed based on the intermittent inte... Read More about Electromagnetic Torque Fluctuating Properties under Dynamic RISC Fault in Turbogenerators.

Fast Experimental Magnetic Model Identification for Synchronous Reluctance Motor Drives (2022)
Journal Article
Varvolik, V., Wang, S., Prystupa, D., Buticchi, G., Peresada, S., Galea, M., & Bozh, S. (2022). Fast Experimental Magnetic Model Identification for Synchronous Reluctance Motor Drives. Energies, 15(6), Article 2207. https://doi.org/10.3390/en15062207

The accurate magnetic model is mandatory for high-performance control of high anisotropy synchronous machines. This paper presents a time-efficient and accurate magnetic model identification based on triangle current injection while the machine under... Read More about Fast Experimental Magnetic Model Identification for Synchronous Reluctance Motor Drives.

A Voltage Spike Suppression Strategy Based on De-Re-Coupling Idea for the Three-Phase High-Frequency Isolated Matrix-Type Inverter (2022)
Journal Article
Liu, H., Wang, Y., Wheeler, P., Zhou, X., & Zhu, K. (2022). A Voltage Spike Suppression Strategy Based on De-Re-Coupling Idea for the Three-Phase High-Frequency Isolated Matrix-Type Inverter. IEEE Transactions on Power Electronics, 37(8), 9024-9034. https://doi.org/10.1109/TPEL.2022.3155184

In order to solve the problem of high voltage spikes on the secondary side of the high-frequency transformer when the three-phase high-frequency isolated matrix inverter (HFIMI) operates under the conventional modulation strategies, a new modulation... Read More about A Voltage Spike Suppression Strategy Based on De-Re-Coupling Idea for the Three-Phase High-Frequency Isolated Matrix-Type Inverter.

Research on the Voltage Spike Suppression Strategy for Three-Phase High Frequency Link Matrix-Type Inverter (2022)
Journal Article
Wang, Y., Liu, H., & Wheeler, P. (2022). Research on the Voltage Spike Suppression Strategy for Three-Phase High Frequency Link Matrix-Type Inverter. IEEE Journal of Emerging and Selected Topics in Power Electronics, 10(5), 6070-6083. https://doi.org/10.1109/jestpe.2022.3155249

The problem of high-voltage spikes on the secondary side of a high-frequency transformer (HFT) in the commutation process of a three-phase high-frequency link matrix-type inverter (HFLMI) is studied. Considering the parasitic capacitance of MOSFETs,... Read More about Research on the Voltage Spike Suppression Strategy for Three-Phase High Frequency Link Matrix-Type Inverter.

A PMSM With Enhanced Anisotropic Rotor Configuration for Sensorless Operations (2021)
Journal Article
Xu, Z., Zhang, T., & Gerada, C. (2021). A PMSM With Enhanced Anisotropic Rotor Configuration for Sensorless Operations. IEEE Transactions on Energy Conversion, 36(4), 2872-2883. https://doi.org/10.1109/tec.2021.3069096

Sensorless control technologies based on rotor saliency may not operate well due to the effect of magnetic saturation. In this work, a rotor backend (RB) is attached to an existing rotor structure of a permanent magnet synchronous motor (PMSM) to enh... Read More about A PMSM With Enhanced Anisotropic Rotor Configuration for Sensorless Operations.