同心笼次级直线双馈电机静态端部效应补偿策略

doi:10.19595/j.cnki.1000-6753.tces.221058

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摘要同心笼次级直线双馈电机是由无刷双馈感应电机演变而来的一种新型直线电机,在城市轨道交通中具有良好的应用前景。然而,因初级铁心开断导致的静态端部效应,电机绕组中含有较大的负序电流和直接耦合电流。针对该问题,该文提出了一种基于脉振电压矢量前馈和静态端部效应电流抑制的补偿策略。首先,分析了静态端部效应在初级绕组中产生的谐波电流成分,推导了产生静态端部效应电流的脉振电动势,并采用脉振电压矢量前馈对其进行抑制;然后,基于混合二阶-三阶广义积分器及瞬时对称分量法,将各频率电流正负序分量变换到同步旋转坐标系中进行控制,以进一步抑制负序电流和直接耦合电流,从而对静态端部效应进行有效补偿;最后,通过仿真和实验验证了静态端部效应补偿策略的有效性。

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	包振
	葛健
	徐伟
	张娅平
	李伟业
	林国斌
	苏诗湖
	刘智成
	袁文烨

关键词 ：直线双馈电机, 静态端部效应, 脉振电压前馈, 特定频率电流提取

Abstract：At present, linear induction machines (LIMs) and linear synchronous machines (LSMs) are mainly used for linear traction system adopted to urban rail transit. As a new type of linear machine, the nest-loop secondary linear doubly-fed machine (NLS-LDFM) and its drive system have gradually attracted the attention of scholars for its advantages of adjustable power factor and flexible operation mode. However, the static end effect exists in NLS-LDFM due to the cut-open primary iron core. It generates the pulsating magnetic field which is evenly distributed along the direction of motion. The phenomenon not only leads to two sets of asymmetrical three-phase windings but also direct-coupling between them. Therefore, the static end effect can produce both negative-sequence current and direct-coupling current in the primary windings. Therein, the negative-sequence current can produce negative thrust, which can weaken the average thrust. And the direct-coupling current does not produce effective thrust or active power. Thus, the static end effect will lead to the reduction of power factor and efficiency in the NLS-LDFM.
Firstly, based on the law of static end effect and the working principle of NLS-LDFM, the main components of harmonic current generated by static end effect are analyzed. Most of the harmonic currents generated by the static end effect can be compensated by suppressing the fundamental negative-sequence current and direct-coupling current. Secondly, based on the analysis of static end effect pulsating inductance matrix and direct-coupling mutual inductance matrix, the expression of pulsating electromotive force is derived. It can be compensated to the primary windings as feedforward voltage to suppress the negative-sequence current and direct-coupling current. Thirdly, a mixed second- and third-order generalized integrator (MSTOGI) is used to extract fundamental current and direct-coupling current to improve the compensation accuracy. The corresponding positive- and negative-sequence components are obtained by using instantaneous symmetric component method. Finally, the effectiveness of proposed compensation strategy is verified by simulation and experiment.
The simulation results show that when the static end effect compensation strategy is not adopted, the three-phase current is very asymmetrical, indicating that the negative-sequence current is of high content. After applying the static end effect compensation strategy, the negative sequence current is effectively suppressed and the three-phase current becomes more symmetrical. By fast Fourier transform analysis of C-phase current of power winding, the current content of direct-coupling decreases from 12.0% to 3.1% after compensation. In experiments, the asymmetry of three-phase current in the power winding decreases from 27.7% to 3.9%, and the content of direct-coupling current decreases from 11.4% to 5.8%.
The following conclusions can be drawn from the simulation and experiment analysis: (1) The static end effect of NLS-LDFM will generate harmonic current and negative-sequence current of various frequencies, of which the fundamental negative-sequence current and direct-coupling current are the main components. (2) The proposed current control process based MSTOGI and pulsating voltage feedforward can suppress the fundamental negative-sequence current and direct-coupling current, which can effectively compensate the static end effect in NLS-LDFM.

Key words： Linear doubly-fed machine (LDFM) static end effect pulsating voltage feedforward selective frequency current extraction

收稿日期: 2022-06-06

PACS:

TM359.4

基金资助:国家自然科学基金面上项目（51877093）、四川省重点研发项目（2021YFG0081）、深圳市基础研究专项（自然科学基金）基础研究面上项目（JCYJ20190809101205546）、华中科技大学“双一流”建设国际合作专项（5001131076）资助

通讯作者: 葛健男,1994年生,博士后,研究方向为直线电机特性分析。E-mail：gejian1994@hust.edu.cn

作者简介: 包振男,1998年生,博士研究生,研究方向为直线电机控制。E-mail：zhenbao@hust.edu.cn

引用本文:

包振, 葛健, 徐伟, 张娅平, 李伟业, 林国斌, 苏诗湖, 刘智成, 袁文烨. 同心笼次级直线双馈电机静态端部效应补偿策略[J]. 电工技术学报, 2023, 38(17): 4621-4632. Bao Zhen, Ge Jian, Xu Wei, Zhang Yaping, Li Weiye, Lin Guobin, Su Shihu, Liu Zhicheng, Yuan Wenye. Compensation Strategy for Static End Effect in Nest-Loop Secondary Linear Doubly-Fed Machine. Transactions of China Electrotechnical Society, 2023, 38(17): 4621-4632.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.221058 https://dgjsxb.ces-transaction.com/CN/Y2023/V38/I17/4621

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