逆变器简化PWM算法及抑制共模电压策略

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摘要基于αβ坐标系,结合分类算法对两电平逆变器脉冲宽度调制（PWM）算法进行简化,该简化算法由三相参考电压直接判断参考电压矢量所处的扇区,并获取器件开关时刻。在分析死区时间对各桥臂开关动作时刻影响的基础上,通过调整开关器件切换时刻,解决因死区时间的存在造成抑制共模电压调制算法失效的问题,消除了共模尖峰电压。仿真和实验结果验证了简化PWM调制算法的正确性,且改进后的抑制共模电压调制策略能有效地减小共模电压。

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	周娟
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关键词 ：共模电压, 简化PWM算法, 分类算法, 逆变器

Abstract：Combining with classification algorithm, this paper simplified the algorithm of pulse width modulation(PWM) used in two-level inverter in αβ coordinate system. The simplified algorithm directly judges the sector in which the reference voltage is located and obtains devices switching points. Based on analyzing the effect of dead time on the devices switching points of each leg, the problem of inhibit common-mode voltage failure due to dead time is solved and common-mode peak voltages are eliminated through adjusting devices switching moments. Simulation and experiment results prove that the simplified algorithm of PWM is correct and modified inhibit common-mode algorithm proposed can reduce common-mode voltage effectively.

Key words： Common-mode voltage simplified algorithm of PWM classification algorithm inverter

收稿日期: 2013-12-24 出版日期: 2014-11-05

PACS:

TM464

基金资助:国家自然科学基金资助项目（51377160）

作者简介: 周娟女,1976年生,博士,副教授,从事电能质量控制、电力电子技术与应用的研究和教学工作；魏琛男,1989年生,硕士研究生,研究方向为电能质量控制技术。

引用本文:

周娟, 魏琛, 杨宇, 陈映, 张彦兵. 逆变器简化PWM算法及抑制共模电压策略[J]. 电工技术学报, 2014, 29(8): 158-165. Zhou Juan, Wei Chen, Yang Yu, Chen Ying, Zhang Yanbing. Inverter Simplified Algorithm of PWM and Inhibit Common-Mode Voltage Strategy. Transactions of China Electrotechnical Society, 2014, 29(8): 158-165.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I8/158

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