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Professor Li Ran

Academic profile photograph

Professor Li Ran

Professor of Power Electronics - Systems 

L dot Ran at warwick dot ac dot uk
+44 (0) 24 7655 1898; 07596720923 (m)

Biography

Li Ran obtained a PhD degree (1989) in Power Systems Engineering from Chongqing University in China for his work on reliability evaluation of the transmission networks planned for the Three-Gorge Hydro Power Plant. He then participated in the commissioning of Gezhouba-Shanghai HVDC System (1989-1990).

Between 1992 and 1999, he was a postdoctoral research fellow with the Universities of Aberdeen, Nottingham and Heriot-Watt (Edinburgh), working on marine electrical propulsion, offshore electrical systems and electromagnetic compatibility (EMC) in power electronic motor drives. He became a Lecturer with the University of Northumbria at Newcastle in 1999 and moved to Durham University in 2003 where he was gradually promoted to a Chair in 2010. He joined the University of Warwick as a Professor of Power Electronics - Systems in 2012. His work at Northumbria, Durham and Warwick has centred around power conversion and control for renewable generation, and reliability of power semiconductors. He was seconded to Alstom Power Conversion at Kidsgrove, the UK (2001-2003) and took a sabbatical leave at MIT, the USA (2007-2008).

Dr Li Ran was the recipient of a Global Research Award of the Royal Academy of Engineering, Stanley-Gray Award of IMarEST and IEEE Prize Paper Awards.

Dr Li Ran was a professor and is an adjunct professor with Chongqing University. He is a Co-Director of the Warwick-Chongqing Joint Key Laboratory (WaCky Lab) in SiC Power Electronics, and the Student Experience Tutor of the Warwick-Chongqing 2+2 Programme in Electrical Engineering and Electronics.

Li Ran is a slow, but passionate, 5 km Parkrun participant (home | parkrun UK).

Research Interests

Application of power electronics for electrical power generation, delivery and utilisation;

Power semiconductors and packaging.

Teaching Interests

Electric Circuit Theory, Analogue Electronics, Instrumentation Systems, Electromagnetic Compatibility, Control Theory, Electric Machines and Drives, Electrical Power Systems, Power Electronic Systems, Renewable Power Generation, and Embedded Generation.

Students are welcome to contact Professor Li Ran to discuss study in these subject areas.

Selected Recent Publications

Book

  • Tavner P, Ran L and Crabtree C, Condition Monitoring of Rotating Electrical Machines, 3rd Edition, IET Press, 2020

Papers in Journals of Learned Societies

  • Tang L, Jiang H, Zhong X, Qiu G, Mao H, Jiang X, Qi X, Du C, Peng Q, Liu L and Ran L, Investigation into the Third Quadrant Characteristics of Silicon Carbide MOSFET, IEEE Trans. on Power Electronics, 2023 (IEEE Xplore early access)
  • Mao H, Hu J, Jiang H, Ran L, Qiu G, Wei J, Chen H, Zhong X, Xiao L, Wang L and Wu Y, An Asymmetrical Power Module Design for Modular Multilevel Converter with Unidirectional Power Flow, IEEE Trans. on Power Electronics, 2023 (IEEE Xplore early access)
  • Wei JX, Feng H and Ran L, Integrated Design for Lifetime Extension and ESR Monitoring of Hybrid DC-Link in Solid-State Transformer from the Perspective of High-Frequency Ripple Current, IEEE Trans. on Power Electronics, Vol. 37, No. 12, 2022, pp15583-15593
  • Ren H, Liu L, Djurovic S, Ran L, Liu X, Feng H and Mawby P, In-situ Contact Pressure Monitoring of Press Pack Power Module Using FBG Sensors, IEEE Trans. on Instrumentation and Measurement, Vol. 71, No. 7, 2022, pp1-11 (7006211)
  • Qiu G, Ran L, Feng H, Jiang H, Mao H and Wei J, A High-precision Sensor Based on AC Flux Cancellation for DC Bias Detection in Dual Active Bridge Converters, IEEE Trans. on Power Electronics, Vol. 37, No. 11, 2022, pp13513-13524
  • Jiang X, Jiang H, Zhong X, Mao H, Wu Z and Ran L, Impact of Gate Resistance on Improving the Dynamic Overcurrent Stress of the Si/SiC Hybrid Switch, IEEE Trans. on Power Electronics, Vol. 37, No. 11, 2022, pp13319-13331
  • Shillaber L, Jiang Y, Ran L and Long T, Ultra Fast Current Shunt (UFCS): A Gigahertz Bandwidth Ultra Low Inductance Current Sensor, IEEE Trans. on Power Electronics, Vol. 37, No. 12, 2022, pp15493-15504
  • Zhong X, Jiang H, Tang L, Qi X, Jiang P and Ran L, Gate Stress Polarity Dependence of AC Bias Temperature Instability in Silicon Carbide MOSFETS, IEEE Trans. on Electron Devices, Vol. 69, No. 6, 2022, pp3328-3333
  • Jiang H, Qi X, Qiu G, Zhong X, Tang L, Mao H, Wu Z, Chen H and Ran L, A Physical Explanation of Threshold Voltage Drift of SiC MOSFET Induced by Gate Switching, IEEE Trans. on Power Electronics, Vol. 37, No. 8, 2022, pp8830-8834
  • Hu Z, Hu B, Ran L, Tavner P, Kong H, Mawby P and Wu R, Monitoring Power Module Solder Degradation from Heat Dissipation in Two Opposite Directions, IEEE Trans. on Power Electronics, Vol. 37, No. 8, 2022, pp9754-9766
  • Wu Z, Jiang H, Zheng Z, Qi X, Liu L and Ran L, Dynamic dv/dt Control Strategy of SiC MOSFET for Switching Loss Reduction in the Operational Power Range, IEEE Trans. on Power Electronics, Vol. 37, No. 6, 2022, pp6237-6241
  • Mao H, Qiu G, Jiang H, Zhong X, Tang L and Ran L, Investigation on the Degradations of Parallel Connected 4H-SiC MOSFETs under Repetitive UIS Stresses, IEEE Trans. on Electron Devices, Vol. 69, No. 2, 2022, pp650-657
  • Yang J, Che Y, Ran L, Du M, Jiang H and Hu B, Monitoring Initial Solder Layer Degradation in a Multichip IGBT Module via Combined TSEPs, IEEE Trans. on Device and Materials Reliability, Vol. 22, No. 1, 2022, pp26-35
  • Ren H, Ran L, Liu X, Liu L, Djurovic S, Jiang H, Barnes M and Mawby P, Quasi-distributed Temperature Detection of Press Pack IGBT Power Module Using FBG Sensing, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 10, No. 5, 2022, pp4981-4992
  • Qiu G, Ran L, Feng H, Jiang H, Long T, Forsyth A, Shao W and Hou X, A Flux Gate-based Current Sensor for DC Bias Elimination in a Dual Active Bridge Converter, IEEE Trans. on Power Electronics, Vol. 37, No. 3, 2022, pp3233-3246
  • Zhong X, Jiang H, Qiu G, Tang L, Mao H, Xu C, Jiang X, Hu J, Qi X and Ran L, Bias Temperature Instability of Silicon Carbide Power MOSFET under AC Gate Stresses, IEEE Trans. on Power Electronics, Vol. 37, No. 2, 2022, pp1998-2008
  • Hu B, Konaklieva S, Kourra N, Williams M, Ran L and Lai W, Long Term Reliability Evaluation of Power Modules with Low Amplitude Thermomechanical Stresses and Initial Defects, IEEE Journal of Emerging and Selected Topics in Power Electronics, Vol. 9, No. 1, 2021, pp602-615
  • Hu B, Hu Z, Ran L, Ng C, Jia C, McKeever P, Tavner P, Zhang C, Jiang H and Mawby P, Heat-Flux Based Condition Monitoring of Multi-chip Power Modules Using a Two-Stage Neural Network, IEEE Trans. on Power Electronics, Vol. 36, No. 7, 2021, pp7489-7500
  • Ren H, Shao W, Ran L, Hao G, Zhou L, Mawby P and Jiang H, A Phase Change Material Integrated Press Pack Power Module with Enhanced Overcurrent Capability for Grid Support – a Study on FRD, IEEE Trans. on Industry Applications, Vol. 57, No. 4, 2021, pp3956-3968
  • Jiang H, Wei J, Fang X, Ren H, Shao W, and Ran L, A delta_Tj Reduced Power Module with In-built Phase Change Materials for Reliability Enhancement, IEEE Trans. on Electron Devices, Vol. 68, No. 9, 2021, pp4557-4564
  • Shao W, Wu R, Ran L, Jiang H, Mawby P, Rogers D, Green T, Coombs T, Yardley K, Kastha D and Bajpai P and Zhou L, A Power Module for Grid Inverter with in-built Short-Circuit Current Capability, IEEE Trans on Power Electronics, Vol. 35, No. 10, 2020, pp10567-10579
  • Bashar E, Rogers D, Wu R, Ran L, Jennings M, Green T and Mawby P, A New Protection Scheme for an SSSC in an MV Network by Using a Varistor and Thyristors, IEEE Trans on Power Delivery, 2020, pp102-113
  • Mohammed A, Hu B, Hu Z, Djurovic S, Ran L, Barnes M and Mawby P, Distributed Thermal Monitoring of Wind Turbine Power Electronic Modules Using FBG Sensing Technology, IEEE Sensors Journal, 2020, Vol. 20, No. 17, pp9886-9894
  • Jiang H, Zhong X, Qiu G, Tang L, Qi X and Ran L, Dynamic Gate Stress Induced Threshold Voltage Drift of Silicon Carbide MOSFET, IEEE Electron Device Letters, 2020, Vol. 41, No. 9, pp1284-1287

Projects and Grants

Title Funder Award start Award end
Packaging Design and Optimization of A New High-Voltage SiC Power Module The Royal Society and NNSF China 31 Mar 2022 30 Mar 2024
Powertrain Research Hub Offshore Renewable Energy Catapult 01 Oct 2021 30 Sep 2024
PE2M: Power Electronics Modules by Rapid Moulding Innovate UK 01 Jan 2022 30 Dec 2023
FutureBEV Innovate UK 01 Aug 2020 31 Jan 2024
Development of an IGBT Power Module with High Short-term Thermal Capacity Zhuzhou CRRC Times Electric UK Innovation Centre 01 Feb 2021 31 Jan 2023
Novel Condition Monitoring and Health Management Technologies for High Voltage SiC Power Modules. EPSRC 01 Oct 2017 30 Sep 2021
Enhancing Control Capability of ORE Systems for Stress Management and Grid Support EPSRC 01 Mar 2020 20 May 2021
IGBT heat flux health monitoring method for wind turbine power convertors Offshore Renewable Energy Catapult 03 Apr 2018 02 Apr 2021
Catapult Researchers in Residence Programme EPSRC 30 Nov 2017 30 Sep 2020
Holistic Operation and Maintenance for Energy from Offshore Wind Farms (HOME-Offshore) EPSRC 30 Mar 2017 1 Oct 2020
Collaboration Agreement: Underpinning Power Electronics EPSRC 01 Jul 2013 30 Jun 2019
UK-India Reconfigurable Distribution Networks - collaboration agreement for EPSRC grant led by Imperial (3-way: also includes Cardiff) EP/K036327/1 EPSRC 01 Jan 2014 31 Dec 2017
Underpinning Power Electronics - Components Theme EPSRC 01 Jul 2013 31 Oct 2017
Leverhulme Visiting Professor Leverhulme Trust 01 Jan 2016 31 Jul 2017
Challenges in High Temperature, High Reliability and High Power Density Press Pack SiC EPSRC 01 Jan 2015 30 Jun 2017
Strengthening Grid for Rural Renewable Power ? A Power Electronics Solution - GCRF Institutional award EPSRC 01 Jun 2016 31 Mar 2017
Collaboration Agreement - Low Carbon Networks Fund bid Western Power Distribution 01 May 2013 31 Dec 2016
Condition monitoring techniques for power electronic offshore renewable applications: KTP with Narec Narec Development Services Limited 01 Jul 2013 30 Jun 2015
The requirements, capabilities and costs for a Low Frequency AC transmission technology to allow for both research and training requirements to take place SP Power Systems Limited 01 Feb 2014 18 Mar 2015
KTP project - with NAREC Technology Strategy Board 01 Mar 2013 28 Feb 2015
Royal Academy of Engineering Distinguished Visiting Fellowship: Design and Operation of Future Electrical Power Systems Royal Academy of Engineering 12 Sep 2012 11 Oct 2012
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