Yujing Liu

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

After 17 years working in ABB Corporate Research with the last position of Senior Principal Scientist, Yujing Liu became full professor in 2013 on electrical power engineering at Chalmers 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 generator for renewable power; (6) synchronous reluctance motor; and (7) electrified drive for vessels; and (8) inductive charging (3.7 kW to 200 kW). He is Chalmers' project leader in 2 EU Horizon2020 projects. He teaches the course "Electrical Machines: Design and Analysis" for 80 master students and the PhD course "High Efficiency Electrical Machines" for 26 students. Now he supervises 1 postdoc, 9 PhD students, 2 project researcher and several master students. In 2018 he was appointed as the Head of Unit for Electrical Machines and Power Electronics at Dept. of Electrical Engineering at Chalmers.

Source: chalmers.se

Showing 22 publications

2019

Multiple electrical machines applied for high drive train efficiency

Nimananda Sharma, Yujing Liu
2018 IEEE International Conference on Electrical Systems for Aircraft, Railway, Ship Propulsion and Road Vehicles & International Transportation Electrification Conference (ESARS-ITEC)
Paper in proceedings
2019

Modeling and Experimental Verification of High-Frequency Inductive Brushless Exciter for Electrically Excited Synchronous Machines

Junfei Tang, Yujing Liu, Nimananda Sharma
IEEE Transactions on Industry Applications. Vol. 55 (5), p. 4613-4623
Journal article
2019

Modelling and Simulation of Fuel Cell/supercapacitor passive hybrid vehicle system

Qian Xun, Yujing Liu, Jian Zhao
IEEE Energy Conversion Congress & Expo , p. 389-394
Paper in proceedings
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

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

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

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

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

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

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
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

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
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 13 research projects

2020–2024

Development of high reliability motor drives for next generation propulsion applications (DORNA)

Yujing Liu Electrical Machines and Power Electronics
Xiaoliang Huang Electrical Machines and Power Electronics
Sonja Lundmark Electrical Machines and Power Electronics
Emma Grunditz Electrical Machines and Power Electronics
Junfei Tang Electrical Machines and Power Electronics
Qian Xun Electrical Machines and Power Electronics
European Commission

2019–2020

Electrification of marine urban transport systems - Pre-study charging

Jonas Ringsberg Marine Technology
Yujing Liu Electrical Machines and Power Electronics
Swedish Energy Agency

2018–2020

Analysis and Improvement of Insulation System of Traction Motors Exposed to High-switching Frequency Converters

Yujing Liu Electrical Machines and Power Electronics
Xiangdong Xu Power grids and Components
ABB Sweden
Swedish Energy Agency

2018–2021

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

Yujing Liu Electrical Machines and Power Electronics
Daniel Pehrman Electrical Machines and Power Electronics
Xiaoliang Huang Electrical Machines and Power Electronics
Swedish Energy Agency

2018–2020

iTEM - Integrated Transmission and Electric Motor

Yujing Liu Electrical Machines and Power Electronics
Georgios Mademlis 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
Xiaoliang Huang Electrical Machines and Power Electronics
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
Artem Rodionov Electrical Machines and Power Electronics
Swedish Energy Agency

2016–2020

Variable Flux Machine for electric vehicles

Yujing Liu Electric Power Engineering
Junfei Tang Electric Power Engineering
Chih-Han Kuo Electrical Machines and Power Electronics
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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