负载换相逆变器驱动电励磁同步电机静止及低速转子位置检测方法

doi:10.19595/j.cnki.1000-6753.tces.181120

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摘要

在负载换相逆变器（LCI）驱动电励磁同步电机控制系统中,由于LCI无法产生频率合适的高频信号,传统的高频信号注入转子位置检测方法无法实现。本文提出一种基于励磁谐波的静止及低速转子位置检测方法。首先针对该方法给出详细的公式推导和理论分析,并对信号处理算法进行简化。然后从励磁电流中选取一个频率合适的谐波分量替代高频注入信号,并给出相应的励磁控制策略。为了降低信号处理中简化算法所带来的检测误差,设计满足算法要求的带通滤波器,并对其引起的检测误差进行补偿。最后,通过15kW的LCI驱动电励磁同步电机实验平台对提出的基于励磁谐波的静止及低速转子位置检测方法进行实验验证。结果表明,所提出的转子位置检测方法在电机静止到20%同步转速之间可以有效地实现转子位置检测,在10%同步转速以下具有较好的检测精度。

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关键词 ：负载换相逆变器, 电励磁同步电机, 无位置传感器, 转子位置检测

Abstract：

In the load commutated inverter fed (LCI-fed) electrically excited synchronous motor control system, since the LCI fails to generate suitable high-frequency signals, the conventional rotor position detection method by high frequency signal injection cannot be realized. A rotor position detection method at standstill or low speed based on the field current harmonic is proposed in this paper. Firstly, the detailed formula derivation and theoretical analysis are given, and the signal processing algorithm is simplified. Then, a harmonic component with appropriate frequency is selected from the field current to replace the injected high frequency signal, and the corresponding field current harmonic control strategy is given. In order to reduce the detection error caused by the simplified algorithm in signal processing, the adequate bandpass filter is designed and the detection error caused by the filter is compensated. Finally, the proposed rotor position detection method at standstill or low speed based on the field current harmonic is verified at a 15kW LCI-fed electrically excited synchronous motor experimental platform. The results show that the proposed rotor position detection method can effectively detect the rotor position from standstill to 20% synchronous speed, and has better detection accuracy below 10% synchronous speed.

Key words： Load commutated inverter electrically excited synchronous motor sensorless control rotor position detection

收稿日期: 2018-06-29 出版日期: 2018-12-29

PACS:

TM359.7

基金资助:

基金项目国家重点研发计划课题（2017YFB0102301）和台达电力电子科教发展计划2018年重点项目（DREK2018003）资助项目

通讯作者: 寇佳宝男,1990年生,博士研究生,研究方向为电励磁同步电机控制、无传感器控制技术。E-mail: koujiabao_hit@163.com

作者简介: 高强男,1964年生,博士,教授,博士生导师,研究方向为大功率交流传动控制、高温电力电子应用。E-mail: gq651@hit.edu.cn

引用本文:

寇佳宝, 高强, 徐可, 徐殿国. 负载换相逆变器驱动电励磁同步电机静止及低速转子位置检测方法[J]. 电工技术学报, 2018, 33(24): 5670-5677. Kou Jiabao, Gao Qiang, Xu Ke, Xu Dianguo. Rotor Position Detection Method at Standstill or Low Speed for Load Commutated Inverter-Fed Electrically Excited Synchronous Motor. Transactions of China Electrotechnical Society, 2018, 33(24): 5670-5677.

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https://dgjsxb.ces-transaction.com/CN/10.19595/j.cnki.1000-6753.tces.181120 https://dgjsxb.ces-transaction.com/CN/Y2018/V33/I24/5670

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