On-Load Voltage Distortion Compensation Method Using Disturbance Observer for SPM Machines with Closed Slot

Chinese Journal of Electrical Engineering ›› 2015, Vol. 1 ›› Issue (1): 58-69.

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On-Load Voltage Distortion Compensation Method Using Disturbance Observer for SPM Machines with Closed Slot

Beomseok Lee, Z. Q. Zhu*, D. Wu

Department of Electronic and Electrical Engineering, University of Sheffield, Sheffield, S1 3JD, UK

Online:2015-12-25 Published:2015-12-25
About author:Beomseok Lee received the B.S. degree in electrical engineering from Chungbuk National University, Chungbuk, Korea, in 2008, and the M.S. degree in electrical engineering from the Pohang University of Science and Technology, Pohang, Korea, in 2010, respectively. He is currently working toward the Ph.D. degree at the University of Sheffield, Sheffield, U.K. His research interests include analysis, and control of ac motor drives, and hybrid and electric propulsion systems.
Z.Q. Zhu, Fellow IEEE, Fellow IET, received the B.Eng. and M.Sc. degrees from Zhejiang University, Hangzhou, China, in 1982 and 1984, respectively, and the Ph.D. degree from The University of Sheffield, Sheffield, U.K., in 1991, all in electrical engineering.
Since 1988, he has been with The University of Sheffield, where he currently holds Royal Academy of Engineering/ Siemens Research Chair and is the Head of the Electrical Machines and Drives Research Group, the Academic Director of Sheffield Siemens Wind Power Research Centre and the Director of CSR Electric Drives Technology Research Centre. He is also the Adjunct Director of Midea Welling Shanghai R&D Centre. His current major research interests include the design and control of permanent-magnet brushless machines and drives for applications ranging from automotive to renewable energy.
Di Wu received the M.Sc. degree in electrical engineering from Huazhong University of Science and Technology, Wuhan, China, in 2011, and the Ph.D. degree in Electronic and Electrical Engineering from the University of Sheffield, Sheffield, U.K. in 2015. He is now R & D Engineer at Midea Welling Shanghai R&D Centre. His major research interests include the design and analysis of permanentmagnet brushless machines.
Supported by:
z.q.zhu@sheffield.ac.uk

Abstract

Abstract: This paper proposes an on-load voltage distortion compensation method, in which the voltage distortion is mainly produced in the surface-mounted permanent magnet machines having closed slot. Apart from the voltage distortions caused by the inverter, such as dead time and inverter non-linearity, the on-load voltage distortion has relatively large magnitude dependent of machine speed. As a result, it causes a significant distortion of current waveforms and deteriorates control performance. Hence, a voltage disturbance compensation method using a disturbance observer is proposed and implemented. Based on the machine model, the disturbance observer is chosen which helps to observe a voltage disturbance, while the error between measured and estimated currents is minimized. The disturbance observer only compensates the sixth-multiple harmonic components of the inverter voltage in synchronous reference frame. The harmonic compensator with multiple narrow-band pass based adaptive filter is proposed and implemented in the feedback loop with current controllers. The observed voltage disturbances are compensated to the reference voltages. In addition, robust performance of the proposed method is shown against the parameter uncertainties. The effectiveness of the proposed compensation scheme is validated by the experiments.

Key words: Closed slot, disturbance observer, inverter non-linearity, on-load voltage distortion, surface-mounted permanent magnet (SPM) machines.

Beomseok Lee, Z. Q. Zhu*, D. Wu. On-Load Voltage Distortion Compensation Method Using Disturbance Observer for SPM Machines with Closed Slot[J]. Chinese Journal of Electrical Engineering, 2015, 1(1): 58-69.

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On-Load Voltage Distortion Compensation Method Using Disturbance Observer for SPM Machines with Closed Slot

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