基于3次谐波控制及脉冲波动分析的三电平SHE-PWM调制优化策略

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摘要提出一种改进的特定谐波消除调制(SHE-PWM)策略,该策略能够抑制NPC型三电平逆变器中点电压波动,消除线电压低次谐波。传统特定谐波消除策略下的脉宽调制电压幅值始终默认为恒定值,即1/2直流侧电压。但实际工况下中点电压波动会导致脉宽调制电压变化不等。因此传统调制求出的开关角在脉冲电压波动的情况下并不能彻底完成指定次谐波消除,输出电压中仍含有少量低次谐波。针对该问题,深入分析了相电压中基波与3次谐波对中点电压波动的影响,对传统SHE-PWM策略进行了改进,通过引入3次谐波控制方程和脉冲电压波动权值系数重构傅里叶方程组。通过实验与传统SHE-PWM策略进行对比,结果表明利用重构的傅里叶方程组求得的开关角能更好地抑制中点电压波动,降低低次谐波含量,进而验证了改进SHE-PWM策略的有效性。

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	谷鑫
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	夏长亮

关键词 ：特定谐波消除, 中点电压波动, 傅里叶分解, 开关角

Abstract：This paper presents an optimal selective harmonic elimination pulse width modulation (SHE-PWM) strategy to reduce the lower-frequency harmonic produced by the neutral point voltage fluctuation in the three-level neutral point clamped (NPC) inverter.In the traditional SHE-PWM,the amplitude of the AC-side voltages is considered to be constant,which is half of the DC-side voltage.However,in the practical implementation,it will vary with the fluctuating neutral point voltage,which will finally deteriorate the effect of the low harmonic elimination.To solve this issue,the neural point voltage fluctuating influence caused by the fundamental and the third harmonic is analyzed in detail.A novel Fourier series is reconstructed by introducing the controlling equation of the third harmonic and considering the influence caused by the AC-side voltages’ variation.Compared with the traditional SHE-PWM through experiment,the results show that the phase angles found out by the reconstructed Fourier series could reduce the lower-frequency harmonic of the line voltages and restrain the fluctuation of the neutral point voltage.Thus the effectiveness of the improved modulation is verified.

Key words： Selective harmonic elimination neutral point voltage fluctuation Fourier decomposition phase angle

收稿日期: 2014-12-01 出版日期: 2015-05-25

PACS:

TM464

基金资助:国家重点基础研究发展(973)计划(2013CB035600)和国家自然科学基金(5130712)资助项目。

通讯作者: 谷鑫男,1980年生,博士,讲师,研究方向为永磁同步电机系统及其控制、电力电子变流技术。

作者简介: 谷鑫男,1980年生,博士,讲师,研究方向为永磁同步电机系统及其控制、电力电子变流技术。姜勃男,1989年生,硕士研究生,研究方向为永磁同步电机驱动系统控制。

引用本文:

谷鑫, 姜勃, 耿强, 夏长亮. 基于3次谐波控制及脉冲波动分析的三电平SHE-PWM调制优化策略[J]. 电工技术学报, 2015, 30(7): 88-96. Gu Xin, Jiang Bo, Geng Qiang, Xia Changliang. An Optimal SHE-PWM Modulation Strategy for Three-level NPC Converter Based on Third Harmonic Control and Pulse Fluctuation Analysis. Transactions of China Electrotechnical Society, 2015, 30(7): 88-96.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I7/88

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