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基于SHEPWM的多模式调制切换算法

余彬 宋文胜 赵雷廷 蒋威 冯晓云

余彬, 宋文胜, 赵雷廷, 蒋威, 冯晓云. 基于SHEPWM的多模式调制切换算法[J]. 西南交通大学学报, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148
引用本文: 余彬, 宋文胜, 赵雷廷, 蒋威, 冯晓云. 基于SHEPWM的多模式调制切换算法[J]. 西南交通大学学报, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148
YU Bin, SONG Wensheng, ZHAO Leiting, JIANG Wei, FENG Xiaoyun. Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148
Citation: YU Bin, SONG Wensheng, ZHAO Leiting, JIANG Wei, FENG Xiaoyun. Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation[J]. Journal of Southwest Jiaotong University, 2020, 55(2): 450-458. doi: 10.3969/j.issn.0258-2724.20180148

基于SHEPWM的多模式调制切换算法

doi: 10.3969/j.issn.0258-2724.20180148
基金项目: 中央高校基本科研业务费专项资金(2682018QY05)
详细信息
    作者简介:

    余彬(1991—),男,博士研究生,研究方向为电力电子与电力传动,E-mail:yubin_electric@163.com

    通讯作者:

    宋文胜(1985—),男,教授,研究方向为电力电子变流技术、列车电力牵引传动控制、车-网耦合系统稳定性分析,E-mail:songwsh@163.com

  • 中图分类号: V221.3

Switching Scheme of Multi-mode Modulation Based on Selected Harmonic Elimination Pulse Width Modulation

  • 摘要: 为了抑制切换过程电流和转矩冲击,提出了一种基于特定次谐波消除脉宽调制(SHEPWM)的多模式调制平滑切换算法. 根据SHEPWM算法的基本原理分析了相电压波形谐波分布情况;基于异步电机等效电路模型得到不同开关角个数下各次电流谐波幅值和调制度的关系;将切换过程抽象为电流基波及各次谐波的一阶暂态响应过程,建立了切换过程的数学模型,从电路原理的角度分析了切换冲击的产生机理;基于RT-LAB半实物实验平台对两种切换算法进行了硬件在环半实物试验对比. 研究结果表明:谐波幅值突变是造成转矩冲击的原因,在相电压基波相位π/2和3π/2处切换谐波电流幅值不发生变化,相电流可以平滑过渡;三相无法同时满足相位为π/2或3π/2的条件,因此分别在相电压基波相位π/2和3π/2处切换,切换过程电流和转矩冲击得到有效抑制.

     

  • 图 1  电流谐波幅值随调制变化曲线

    Figure 1.  Trajectories of current harmonics with respect to modulation index

    图 2  切换过程基波等效电路

    Figure 2.  Equivalent circuit for the fundamental wave during switching process

    图 3  逆变器 + 电机简化模型

    Figure 3.  Simplified model of inverter and motor

    图 4  三相等效电路

    Figure 4.  Three phase equivalent circuits

    图 5  多模式调制算法

    Figure 5.  Illustration of multi-mode modulation algorithm

    图 6  N = 3切换至N = 2时电流、开关信号波形

    Figure 6.  Experimental results of currents and switching signals when switching from N = 3 to N = 2

    图 7  N = 3切换至N = 2时转矩、开关信号波形

    Figure 7.  Experimental results of torque and switching signals when switching from N = 3 to N = 2

    图 8  全速域转矩、定子频率与切换信号波形

    Figure 8.  Experimental results of torque,stator frequency and switching signal of modulation mode in whole speed range

    表  1  试验参数

    Table  1.   Parameters in the experiments

    参数数值参数数值
    额定功率/kw 562 定子漏感/mH 1.241
    额定电压/V 2 750 转子漏感/mH 1.864
    额定频率/Hz 140 互感/mH 3.472
    定子电阻/Ω 0.097 4 极对数 2
    转子电阻/Ω 0.064 6 转动惯量/(kg•m2 200
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出版历程
  • 收稿日期:  2018-03-22
  • 修回日期:  2018-10-10
  • 网络出版日期:  2018-10-15
  • 刊出日期:  2020-04-01

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