基于改进型准比例谐振控制的电励磁双凸极电机电流谐波抑制方法

doi:10.19595/j.cnki.1000-6753.tces.220981

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摘要

电励磁双凸极电机的非正弦反电势特性会导致相电流存在较大的2次和4次谐波,从而降低了电机的转矩输出能力。同时,电励磁双凸极电机的电流谐波频率较高,导致传统准比例谐振控制器经过双线性变换后会存在较大的谐振频率偏差,使得电流谐波抑制效果有限。针对该问题,本文首先推导了具有零谐振频率偏差的离散变换表达式,并对表达式进行简化处理,提出了一种基于改进型准比例谐振控制的电励磁双凸极电机电流谐波抑制方法。此外,结合电机的反电势特性,本文分析了相电流谐波的产生原因,推导了考虑电流谐波和反电势谐波的电励磁双凸极电机转矩模型,分析了相电流谐波对电机平均转矩的影响。最后,仿真和实验结果表明,本文所提出的方法可以有效地补偿谐振频率偏差,抑制电励磁双凸极电机的相电流谐波,提升电机的转矩输出能力。

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	陈旭
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关键词 ：电流谐波, 电励磁双凸极电机, 准比例谐振控制, 谐振频率偏差, 转矩输出能力

Abstract：

The doubly salient electro-magnetic machine (DSEM) has been proposed by introducing additional field windings on the stator of the switched reluctance motor (SRM). Therefore, the DSEM has advantages of simple and reliable structure, and flexible flux-regulation ability, which make the DSEM suitable for wide speed range operation. However, due to the non-sinusoidal back electromotive force (EMF) of DSEM, the phase current has significant 2nd and 4th current harmonics under the conventional sinusoidal current control method. The 2nd and 4th current harmonics will deteriorate the torque capability of the DSEM. Meanwhile, the high harmonic frequency of the DSEM makes the conventional quasi proportional resonant (PR) controller have considerable resonance frequency deviation under conventional discretization method. To address this issue, an improved quasi-PR control has been proposed based on the discretization method with zero resonance frequency deviation in this paper.
Firstly, the production mechanism of the current harmonics is analyzed with the help of the back-EMF characteristics of DSEM. Then, the average torque model of the DSEM considering the current and back-EMF harmonics is derived. Secondly, the operation principle of quasi-PR control is introduced and the influence of control parameter is analyzed through bode diagram. Then, the equation of resonance frequency deviation under conventional bilinear transform is derived. The discretization method with zero resonance frequency deviation is proposed by introducing the compensation coefficient based on bilinear transform. Furthermore, the improved discretization equation is simplified by replacing tangent function with polynomial function. The amplitude-frequency response shows that the improved quasi-PR controller can effectively compensate the resonance frequency deviation. Finally, the current harmonics suppression method of DSEM based on improved quasi-PR control is introduced and the simulation and experiments are carried out to verify the performance.
The performance of improved quasi-PR control is compared with the performance of PI control and conventional quasi-PR control through simulation and experimental results. Firstly, the simulation and experimental results at rated speed show that the phase current has nonnegligible 2nd and 4th harmonics under PI control. The conventional quasi-PR control can reduce the phase current harmonics to some extent. However, due to resonance frequency deviation, there is still considerable phase current harmonics under conventional quasi-PR control. The improved quasi-PR control can effectively suppress the phase current harmonics by compensating the resonance frequency deviation. Secondly, the simulation and experimental results at different speed show that the improved quasi-PR control proposed in this paper can obtain much lower phase current harmonics than PI control and conventional quasi-PR control at different speed. Finally, based on the torque model, the influence of current harmonics on average torque is analyzed and the results show the uncontrollable current harmonics under PI control contribute the negative average torque. By suppressing the current harmonics, the improved quasi-PR control can significantly eliminate the negative average torque. Therefore, the improved quasi-PR control can suppress the current harmonics and enhance the torque capability of DSEM.
The following conclusions can be drawn from simulation and experimental results: 1) The high fundamental frequency of DSEM leads to significant resonance frequency deviation and deteriorates current harmonics suppression performance of conventional quasi-PR control. 2) The improved quasi-PR control proposed in this paper can compensate the resonance frequency deviation and suppress current harmonics. The 2nd and 4th harmonics content under PI control are 23.50% and 14.16%. The 2nd and 4th harmonic content under improved quasi-PR control are 1.76% and 3.31%. 3) The uncontrollable current harmonics under PI control contribute negative average torque. The improved quasi-PR control can effectively suppress the current harmonics and therefore the torque ampere ratio of DSEM can be enhanced by 10.6%.

Key words： Current harmonic doubly salient electro-magnetic machine quasi proportional resonant control resonance frequency deviation torque capability

PACS:

TM352

基金资助:

国家自然科学基金面上项目（51977108）和国家自然科学基金重点项目（51737006）

通讯作者: 张卓然男,1978年生,教授,博士生导师,研究方向多电飞机电气系统、新能源发电与电驱动技术。E-mail：apsc-zzr@nuaa.edu.cn

作者简介: 陈旭男,1997年生,博士研究生,研究方向为电励磁双凸极电机驱动控制技术。E-mail：nuaachenxu@nuaa.edu.cn

引用本文:

陈旭, 张卓然, 于立, 孙窈, 徐秋钰. 基于改进型准比例谐振控制的电励磁双凸极电机电流谐波抑制方法[J]. 电工技术学报, 0, (): 28-28. Chen Xu, Zhang Zhuoran, Yu Li, Sun Yao, Xu Qiuyu. Current Harmonic Suppression Method of Doubly Salient Electro-magnetic Machine Based on Improved Quasi Proportional Resonant Control. Transactions of China Electrotechnical Society, 0, (): 28-28.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.220981 https://dgjsxb.ces-transaction.com/CN/Y0/V/I/28

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