Optimized Non-sinusoidal Power Supply in High-Power Multiphase Induction Motor Drive Based on Harmonic Parameter Analysi
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ORIGINAL ARTICLE
Optimized Non‑sinusoidal Power Supply in High‑Power Multiphase Induction Motor Drive Based on Harmonic Parameter Analysis Wubin Kong1 · Haifeng Guo1 · Guangdi Tang2 · Zhixian Zhong3 Received: 10 May 2019 / Revised: 1 August 2020 / Accepted: 20 August 2020 © The Korean Institute of Electrical Engineers 2020
Abstract A non-sinusoidal power supply is usually applied in a multiphase induction motor drive in order to improve the torque density with harmonic current injection. The harmonic parameters in the motor are essential for harmonic current proportion derivation. In the present work, detailed inductance parameters are derived, and an optimized non-sinusoidal power supply is proposed based on harmonic parameter analysis. The traditional method considers only air-gap flux density distribution optimization, while the yoke flux density is ignored. The proposed method focuses on optimizing the air-gap flux density and yoke flux density simultaneously. The proposed method improves the stator iron utilization, and the torque density and efficiency are enhanced under heavy loads. Finally, 15 kW and 630 kW nine-phase motor drives are constructed, and the proposed non-sinusoidal power supply control strategy is validated experimentally. Keywords Non-sinusoidal power supply · Multiphase motor · Harmonic parameter · Harmonic current injection · Torque density
1 Introduction Multiphase motor drives have attracted a considerable amount of interest due to their advantages over traditional three-phase motor drives, including high power rating with standard power devices, high reliability and high torque density [1–3]. The pace of research started accelerating in the 1990s, predominantly due to developments in the area of electric ship propulsion [4, 5]. Various solutions have also
* Zhixian Zhong [email protected] Wubin Kong [email protected] Haifeng Guo [email protected] Guangdi Tang [email protected] 1
Huazhong University of Science and Technology, Wuhan, China
2
Tongji University, Zhuzhou, China
3
College of Mechanical and Control Engineering, Guilin University of Technology, Guilin, China
been applied in train traction, electric vehicles, and moreelectric aircraft [6]. Compared with traditional three-phase motors, a multiphase motor is a multivariable, strongly coupled, nonlinear system [7]. The motor and control designs are more complicated [8]. There are multiple orthogonal d–q planes in the multiphase motor, and the parameters in each plane are different. The characteristics of a multiphase induction motor with concentrated windings are discussed in [7, 8]. Magnetomotive force (MMF) in an n-phase motor was derived and an analytical model of concentrated winding induction motor was obtained in [9, 10]. However, studies have rarely focused on the parameters in the multiple d–q planes. In the rotor field-oriented control scheme, the parameters are obviously important for improving drive performance [11, 12]. The hardware realization of high-power multiphase induction motor drives is
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