一种考虑死区与最小脉宽限制的IPWM算法

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摘要由于存在死区时间和最小脉宽限制，造成两电平三相电压源型逆变器的实际电压空间缩小，因此，传统的七段式SVPWM及其过调制算法不再完全适用。为此，本文提出了一种新颖的考虑死区与最小脉宽限制的综合式脉宽调制（IPWM）算法。首先，该算法将经典的七段式SVPWM与五段式DPWM1、三段式PWM、一段式PWM综合起来，并重新划分了线性调制区和过调制区，有效扩展了实际的电压空间。其次，该算法对过调制算法进行优化，减小了运算量并降低了输出谐波;同时，通过对参考电压进行线性修正，有效地提高了输出电压基波幅值的线性度。针对调制电平与恒定电平之间的切换问题，也给出了基于有限状态机的新死区插入方法。最后，在感应电机的实验结果验证了该算法的可行性与优越性。

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	黄招彬
	游林儒
	汪兆栋
	文小琴

关键词 ：电压源型逆变器, 综合式脉宽调制, 死区时间, 最小脉宽限制, 过调制, 有限状态机

Abstract：In two-level three-phase voltage source inverter,both dead-time and minimum pulse- width limitation(MPWL) narrow down the practical voltage space,which results in the invalidation of the conventional space vector pulse-width modulation(PWM) and related over-modulation methods. A novel integrated PWM(IPWM) strategy is proposed with dead-time and MPWL considered. First,the strategy combines the classical seven-segment SVPWM with five-segment DPWM1,three-segment PWM and one-segment PWM,redefines the linear-modulation region and the over-modulation region and increases the practical voltage space. Second,the strategy decreases the calculation time and reduces total harmonic distortion(THD) with the optimum over-modulation method,while it improves the output voltage linearity by the reference voltage linearization. Additionally,the strategy presents the inserting method of the new dead-time based on finite state machine. Finally,confirmatory experimental results on induction motor valid the IPWM strategy and illustrates its excellent performance.

Key words： Voltage source inverter integrated pulse-width modulation(IPWM) dead-time minimum pulse-width limitation over-modulation finite state machine

收稿日期: 2013-12-22 出版日期: 2015-01-22

PACS:

TM464

作者简介: 黄招彬男，1986年生，博士研究生，研究方向为电力电子与电机控制。游林儒男，1956年生，教授，博士生导师，研究方向为电力电子与运动控制、检测技术与自动化装置。

引用本文:

黄招彬，游林儒，汪兆栋，文小琴. 一种考虑死区与最小脉宽限制的IPWM算法[J]. 电工技术学报, 2014, 29(12): 11-18. Huang Zhaobin,You Linru,Wang Zhaodong,Wen Xiaoqin. A Novel Integrated PWM Strategy Considering Dead-Time and Minimum Pulse-Width Limitation. Transactions of China Electrotechnical Society, 2014, 29(12): 11-18.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I12/11

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