电压型逆变器非线性的分析及补偿

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摘要为提高异步电机无速度传感器控制系统中磁链估算的精度,本文分析了死区时间和绝缘栅双极型晶体管（IGBT）非理想特性对电压型逆变器输出误差的影响,得出在母线电压不变的情况下,IGBT关断过程中,输出电压上升下降时间与电流值成反比的结论。结合实验数据,讨论了占空比、开关频率、相电流与误差电压的关系。在此基础上,本文提出了一种新颖的逆变器非线性补偿方法,电流较小时,该方法补偿的误差电压随电流值变化明显。实验证明该补偿方法能够很好地抑制因逆变器误差电压产生的扰动,准确估算电机转子磁链的幅值和相位。

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	陈斌
	王婷
	吕征宇
	姚文熙

关键词 ：电压型逆变器, 非线性, 误差电压, IGBT非理想特性, 磁链估算

Abstract：In order to improve the accuracy of the flux estimation in sensorless control system for induction motor, this paper analyzed the inverter nonlinear error caused by dead time and insulated gated bipolar transistor(IGBT) non-ideal characteristics. A conclusion is drawn that the rise or fall time of output voltage is inversely proportional to current value in IGBT turn-off process when bus voltage keeps constant. According to the experimental result, the relationship between duty cycle, switching frequency, phase current and voltage error is investigated. Based on the relationship, a new inverter nonlinearity compensation method is proposed. The compensation voltage changes with the current value, particularly at low current. Experiments show that the compensation method can inhibit disturbance caused by inverter nonlinear error, and estimate the magnitude and phase of rotor flux more accurately.

Key words： Voltage source inverter nonlinearity error voltage IGBT non-ideal characteristics flux estimation

收稿日期: 2012-03-06 出版日期: 2014-11-05

PACS:

TM464

基金资助:国家自然科学基金（51177148）和浙江省重点科技创新团队（2010R50021）资助项目

作者简介: 陈斌男,1988年生,博士研究生,主要从事异步电机变频调速相关技术的研究。王婷女,1988年生,硕士研究生,主要从事异步电机无速度传感器变频调速相关技术的研究。

引用本文:

陈斌, 王婷, 吕征宇, 姚文熙. 电压型逆变器非线性的分析及补偿[J]. 电工技术学报, 2014, 29(6): 24-30. Chen Bin ,Wang Ting ,Lü Zhengyu ,Yao Wenxi. The Analysis and Compensation of Voltage Source Inverter Nonlinearity. Transactions of China Electrotechnical Society, 2014, 29(6): 24-30.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2014/V29/I6/24

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