基于频域分析的无拍频控制策略离散化方法

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摘要交直交供电模式的动车组牵引系统中,单相脉冲整流器的特性使得直流侧存在2倍频脉动分量。该脉动分量使得电机的转矩和电流均存在脉动,即拍频现象。传统方法通过硬件LC滤波器抑制直流电压脉动,该方法降低了变流器的功率密度并且增加了成本。本文首先对拍频现象做了分析,提出适用于转子磁场定向矢量控制系统的无拍频控制策略。控制器在数字系统中的控制性能依赖于离散化方法,本文对采用后向欧拉离散的传统脉动电压采样进行了优化以准确获得脉动分量,然后用八种离散化方法分别对本文控制器进行离散化处理,从离散精度、控制性能和数字实现难易程度进行了详细对比,得到针对本文控制器的最优离散化方法,最后对本文所提方法进行了仿真和实验验证。

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	董侃
	刁利军
	唐敬
	陈奕舟
	刘志刚

关键词 ：无拍频控制, 离散化, 矢量控制, 牵引系统

Abstract：Because of the configuration of the single-phase converter in the traction system, DC-link voltage contains a ripple component with a twice frequency of the catenary. The ripple voltage will cause motor torque and current pulsation, which is called beat phenomenon. LC filter is often installed in DC link to absorb the pulsating power, but this traditional method will cause lower power density and higher cost. The origin of beat phenomenon is analyzed in this paper, and a beat-less control scheme is discussed in detail. The performance of the controller in digital system is determined by discretization method. In this paper, the ripple voltage sampled by backward Euler discretization method is optimized to accurately obtain the ripple component, and the beat-less controller is discretized in 8 methods, by comparison of discrete precision, control performance and the complexity to implement in digital system, an optimal discretization method is chose for the controller. Simulation and experimental results confirm the effectiveness and validity of the proposed scheme.

Key words： Beat-less control discrete method vector control traction system

收稿日期: 2014-09-10 出版日期: 2015-06-29

PACS:

TM46

基金资助:“十二五”国家科技支撑计划重点项目（2013BAG21QB00）及国家自然科学基金（U1134204）资助项目

作者简介: 董侃 ,男，1987年生，博士研究生，研究方向为电力电子与电力传动。刁利军 ,男，1980年生，副教授，本文通讯作者，研究方向为电力电子与电力传动、微计算机控制、载运工具工程运用等。

引用本文:

董侃, 刁利军, 唐敬, 陈奕舟, 刘志刚. 基于频域分析的无拍频控制策略离散化方法[J]. 电工技术学报, 2015, 30(10): 283-291. Dong Kan, Diao Lijun, Tang Jing, Chen Yizhou, Liu Zhigang. Discrete Method Research for Beat-less Control Strategy Based on Frequency Domain Analysis. Transactions of China Electrotechnical Society, 2015, 30(10): 283-291.

链接本文:

https://dgjsxb.ces-transaction.com/CN/Y2015/V30/I10/283

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