二极管中点钳位型三电平逆变器—交流电机调速系统的高精度建模与分析

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摘要在将二极管中点钳位型三电平逆变器—交流电机调速系统应用于实际的工业场合时,高精度的仿真模型是必不可少的设计与分析工具。本文深入地分析了三电平逆变器—异步电机调速系统的运行机理、调制方式与控制策略,基于Matlab/Simulink建立了完整的仿真分析模型。在建模过程中充分考虑了影响仿真模拟精度的关键要素,包括IGBT的动态开关过程、空间矢量调制过程中的死区设置以及异步电机的空载转矩等。将通过仿真分析模型获得的仿真结果与实验样机上取得的测试结果进行了全面的比较。结果表明,稳态运行时电机电压、电流的相对模拟误差小于4%,电流谐波畸变率的相对模拟误差仅为10.78%,负载转矩动态变化时电机电流整定时间的相对模拟误差小于9%。上述结果充分证明了本文建立的三电平逆变器-异步电机调速系统仿真分析模型具有非常高的模拟精度,为设计研发相关的实际系统装置提供了重要的设计工具和分析手段。

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	梅杨
	孙凯
	黄震

关键词 ：三电平逆变器, 交流电机, 调速系统, 建模, 精度

Abstract：Neutral-point-clamped(NPC) three-level inverter fed AC motor drives are widely used in many industrial applications, while high accuracy model is an indispensible design and analysis tool. The operational principle, modulation method and control strategy of the NPC three-level inverter fed induction motor drive system are discussed in detail, and a complete simulation model is established by using Matlab/Simulink. In the modeling process, some key issues, which influence the emulation accuracy, are taken into account, such as the switching transients of IGBT, the dead time setting in the space vector modulation and the no-load torque of induction motor. The simulated results by the developed model have been compared with the measurement results on the experimental prototype. The comparison results show that, the relative emulation errors of motor voltages and currents at the steady-state are less than 4%, the relative emulation error of the total harmonic distortion of the motor current is only 10.78%, and the relative emulation errors of the settling time of motor currents under load torque changes are less than 9%. These results demonstrate that the developed model has very high emulation accuracy and can be used as the important design and analysis tool for the practical applications of three-level inverter fed AC motor drives.

Key words： Three-level inverter AC motor motor drive system modeling accuracy

收稿日期: 2014-09-09 出版日期: 2015-04-10

PACS:

TM46

基金资助:国家自然科学基金资助项目（50907002,51477003）

作者简介: 梅杨女,1981年生,博士,副教授,研究方向为电力电子与电力传动。孙凯男,1977年生,博士,副教授,研究方向为电力电子与电力传动。

引用本文:

梅杨,孙凯,黄震. 二极管中点钳位型三电平逆变器—交流电机调速系统的高精度建模与分析[J]. 电工技术学报, 2015, 30(6): 200-207. Mei Yang,Sun Kai,Huang Zhen. High Accuracy Modeling and Analysis of Neutral-Point-Clamped Three-Level Inverter Fed AC Motor Drive System. Transactions of China Electrotechnical Society, 2015, 30(6): 200-207.

链接本文:

http://dgjsxb.ces-transaction.com/CN/Y2015/V30/I6/200

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