Selective Harmonic Elimination PWM Switching Principle in Multi-Mode Modulation for Five-Phase Permanent Magnet Synchronous Motors

2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA) Pub Date : 2019-06-01 DOI:10.1109/ICIEA.2019.8834001

T. Tang, Bin Yu, Hengbin Cui, Na Wang, Wensheng Song

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引用次数: 3

Abstract

Multi-phase permanent magnet synchronous motors (PMSM) are potentially used in the field of rail transit and due to theirs high power density and high reliability. For high power applications, Multi-mode modulation strategy based on selective harmonic elimination pulse width modulation (SHEPWM) are often used to achieve excellent current performance at very low switching frequency. However, the current impact caused by transition process of SHEPWM with different carrier ratios is a terrible issue in engineering application. To address this problem, this paper investigates the generation mechanism of current impact in the transition process according to the equivalent circuit model of five-phase PMSM firstly. Furthermore, theoretical analysis results proved that each phase independent switching scheme can achieve different carrier ratio SHEPWM smooth transition. Finally, the simulation results have verified the correctness and effectiveness of the theoretical analysis.

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五相永磁同步电动机多模调制中的选择性谐波消除PWM开关原理

多相永磁同步电动机具有高功率密度、高可靠性等优点，在轨道交通领域有着广阔的应用前景。在大功率应用中，通常采用基于选择性谐波消除脉宽调制(SHEPWM)的多模调制策略，以在极低的开关频率下获得优异的电流性能。然而，在工程应用中，不同载流子比的SHEPWM在过渡过程中产生的影响是一个非常严重的问题。针对这一问题，本文首先根据五相永磁同步电机等效电路模型，研究了过渡过程中电流冲击的产生机理。理论分析结果证明，每种相位无关开关方案都能实现不同载流子比的SHEPWM平滑过渡。最后，仿真结果验证了理论分析的正确性和有效性。

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2019 14th IEEE Conference on Industrial Electronics and Applications (ICIEA)

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