Yujing Liu

Professor at Chalmers, Electrical Engineering, Electric Power Engineering, Electrical Machines and Power Electronics

After 17 years working in ABB Corporate Research Center in Sweden, Yujing Liu became Full Professor in 2013 on electrical power engineering with focus on the applications of electrical machines and power electronics in sustainable electrical systems. Yujing Liu leads his research team to develop innovative and cost-effective solutions for renewable energy conversion and transportation electrification. Some examples of on-going research include (1) electrically-excited machine; (2) integrated PE-machine drive; (3) fuel cell powered drivetrain; (4) modular distributed vehicle drive; (5) 5-level MV NPC converter and MV PM generator for renewable energy; (6) synchronous reluctance motor; and (7) inductive charging. He is task leader in 2 EU Horizon2020 projects. He teaches Electric Drives (master student course, 90 students) and High Efficiency Electrical Machines (PhD course, 26 students) and supervises 6 PhD students, 1 postdoc and several project researcher and master students.

Source: chalmers.se

Showing 20 publications

2018

Design and Experimental Verification of a 48 V 20 kW Electrically Excited Synchronous Machine for Mild Hybrid Vehicles

Junfei Tang, Yujing Liu
International Conference on Electrical Machines
Paper in proceedings
2018

Commutation Torque-ripple Minimization for Brushless DC Motor Based on Quasi-Z-Source Inverter

Qian Xun, Yujing Liu
Proceedings - 2018 23rd International Conference on Electrical Machines, ICEM 2018, p. 1439-1445
Paper in proceedings
2018

Rotor Design of a Line-Start Synchronous Reluctance Machine with Respect to Induction Machine for Industrial Applications

Anton Kersten, Yujing Liu, Daniel Pehrman
Proceedings - 2018 23rd International Conference on Electrical Machines, ICEM 2018. Vol. 24 October 2018, p. 393-399
Paper in proceedings
2018

Multiple electrical machines applied for high drive train efficiency

Nimananda Sharma, Yujing Liu
Paper in proceedings
2018

Study of Voltage Spikes and Temperature Rise in Power Module Based Integrated Converter for 48 V 20 kW Electrically Excited Synchronous Machines

Junfei Tang, Yujing Liu, Yashovardhan Rastogi et al
2018 IEEE Applied Power Electronics Conference and Exposition (APEC) . Vol. 2018-March, p. 210-217
Paper in proceedings
2018

Comparative Study of the Torque Ripple and Iron Losses of a Permanent Magnet Synchronous Generator Driven by Multilevel Converters

Georgios Mademlis, Yujing Liu, Jian Zhao
2018 XIII International Conference on Electrical Machines (ICEM)
Paper in proceedings
2018

A Comparative Study of Fuel Cell Electric Vehicles Hybridization with Battery or Supercapacitor

Qian Xun, Yujing Liu, Elna Holmberg
SPEEDAM 2018 - Proceedings: International Symposium on Power Electronics, Electrical Drives, Automation and Motion, p. 389-394
Paper in proceedings
2018

Comparisons of Concentrated and Distributed Winding PMSM in MV Power Generation

Jian Zhao, Yujing Liu, Xiangdong Xu
2018 XIII International Conference on Electrical Machines (ICEM), p. 2437-2443
Paper in proceedings
2018

DC Link Voltage Balancing Technique Utilizing Space Vector Control in SiC-based Five-Level Back-to-Back-Connected NPC Converters

Georgios Mademlis, Yujing Liu
2018 IEEE Energy Conversion Congress and Exposition (ECCE), p. 3032-3037
Paper in proceedings
2018

Feed-Forward Control for Active Voltage Balancing in Electric Drives with Five-Level NPC Converters

Georgios Mademlis, Yujing Liu
2018 IEEE Energy Conversion Congress and Exposition (ECCE)
Paper in proceedings
2018

Generator Speed Control and Experimental Verification of Tidal Undersea Kite Systems

Georgios Mademlis, Yujing Liu, Peiyuan Chen et al
2018 XIII International Conference on Electrical Machines (ICEM)
Paper in proceedings
2017

Combined Voltage Balancing Techniques of the DC Link in Five-Level Medium Voltage NPC Back-to-Back Converters for Offshore Renewable Generation

Georgios Mademlis, Yujing Liu, Nima Saadat
2017 19th European Conference on Power Electronics and Applications
Paper in proceedings
2017

Comparison of copper loss minimization and field current minimization for Electrically Excited Synchronous Motor in mild hybrid drives

Junfei Tang, Yujing Liu
2017 19th European Conference on Power Electronics and Applications (EPE'17 ECCE Europe)
Paper in proceedings
2016

Sensorless control of a PMSM with a transmission system including shunt branches

Junfei Tang, Stefan Lundberg, Francesco Marra et al
Proceedings - 2016 22nd International Conference on Electrical Machines, ICEM 2016. Lausanne; Switzerland; 4-7 September 2016, p. 1160-1166
Paper in proceedings
2016

High frequency exciter of electrically excited synchronous motors for vehicle applications

Yujing Liu, Daniel Pehrman, Odyssefs Lykartsis et al
Proceedings - 2016 22nd International Conference on Electrical Machines, ICEM 2016. Lausanne; Switzerland; 4-7 September 2016, p. 378-383
Paper in proceedings
2015

Study on filtering performance of soft magnetic composite inductors for switching harmonics in 3-phase 70 kW PWM converter systems

Daniel Pehrman, Yujing Liu, Yuriy Serdyuk et al
7th Annual IEEE Energy Conversion Congress and Exposition, ECCE 2015, Montreal, Canada, 20-24 September 2015, p. 3024-3031
Paper in proceedings
2014

Grid and storage

Jimmy Ehnberg, Yujing Liu, Maria Grahn
Systems Perspectives on Renewable Power 2014, p. 46-59
Book chapter
2014

Nät och elenergilager

Jimmy Ehnberg, Yujing Liu, Maria Grahn
Perspektiv på förnybar el 2014, p. 14-15
Book chapter
2013

Finite element analysis of end ring impedance in squirrel cage induction machines

D.V. Svechkarenko, W. Chen, Yujing Liu et al
2013 IEEE Energy Conversion Congress and Exposition, ECCE 2013, p. 254-259
Paper in proceedings

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Showing 10 research projects

2018–2021

Modular inductive power transfer (IPT) for high power vehicle charging

Yujing Liu Electrical Machines and Power Electronics
Swedish Energy Agency

2018–2020

iTEM - Integrated Transmission and Electric Motor

Yujing Liu Electrical Machines and Power Electronics
Swedish Energy Agency

2018–2019

Propeller-integrated motor drive for electric medium size boats

Yujing Liu Electric Power Engineering
Felix Mannerhagen Electric Power Engineering
Jonas Ringsberg Marine Technology
Arash Eslamdoost Marine Technology
Stefan Lundberg Electric Power Engineering
Chalmers

2018–2018

Floating voltage fuel cell drive system

Yujing Liu Electric Power Engineering
Qian Xun Electric Power Engineering
Swedish Energy Agency

2017–2020

Integrated Modular Distributed Drivetrain for Electric/Hybrid Vehicles

Yujing Liu Electric Power Engineering
Nimananda Sharma Electric Power Engineering
Jian Zhao Electric Power Engineering
European Commission

2017–2019

Cost-effective drivetrains for fuel cell powered EVs

Yujing Liu Electric Power Engineering
Qian Xun Electric Power Engineering
SHC

2016–2020

Integrerade drivsystem för elektriska fordon

Yujing Liu Electric Power Engineering
Nimananda Sharma Electric Power Engineering
Swedish Energy Agency

2016–2019

Variable Flux Machine for electric vehicles

Yujing Liu Electric Power Engineering
Junfei Tang Electric Power Engineering
Swedish Energy Agency

2016–2018

Power Take-Off System for a Subsea Tidal Kite (PowerKite)

Yujing Liu Electric Power Engineering
Linus Hammar Environmental Systems Analysis
Mohamad Kaddoura Environmental Systems Analysis
Olivia Langhamer Environmental Systems Analysis
Georgios Mademlis Electric Power Engineering
Sverker Molander Environmental Systems Analysis
Jian Zhao Electric Power Engineering
Johan Tivander Environmental Systems Analysis
European Commission (Horizon 2020)

2015–2018

SWC Skalbar sladdlös laddning

Yujing Liu Electric Power Engineering
Daniel Pehrman Electric Power Engineering
Swedish Energy Agency

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