异步电动机铁耗对直接转矩控制性能的影响及补偿方法  

Iron Loss Influence of Induction Motors on DTC Performance and Its Compensation Method

作　　者：张云[1] 吴凤江[1] 孙力[1] 赵克[1] 

机构地区：[1]哈尔滨工业大学电气工程及自动化学院,哈尔滨150001

出　　处：《电工技术学报》2008年第9期51-57,共7页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金(50477009);黑龙江省自然科学基金(E200625)资助项目

摘　　要：传统直接转矩控制器没有考虑异步电动机铁耗,造成转矩控制性能下降。在两相静止αβ坐标系下建立了考虑铁耗的异步电动机动态等效数学模型。基于不考虑与考虑铁耗的电机模型,对传统DTC控制器控制性能进行了对比分析,结果表明铁耗导致传统转矩估算结果与输出转矩存在偏差,造成输出转矩无法达到参考给定转矩。本文基于考虑铁耗的异步电动机动态等效数学模型,提出一种铁耗补偿器,以校正传统转矩估算结果,使估算转矩更接近于实际输出转矩,提高了转矩控制性能。实验结果验证了改进后的DTC控制器的有效性,可提高造纸业卷绕传动等的张力转矩控制性能,进而提高产品质量。Conventional DTC controller doesnt take iron loss of IM into account, so it causes the degressive torque control performance. The dynamic equivalent mathematical model of IM considering iron loss is established under two-phase static αβ coordinate. And the performance caused by conventional DTC controller between the IM model without considering iron loss and the one taking iron loss into account is analyzed contrastively. It is manifested that the error between conventional torque estimation and actual output torque does exist due to iron loss, and it also makes actual output torque not reach reference torque command. Therefore, a kind of compensator based on dynamic equivalent mathematical model of IM considering iron loss is developed to modify conventional torque estimation. It makes present torque estimation be closer to actual output torque, and the performance of torque control is improved too. What＇s more, the validity of modified DTC controller is verified by experiment results. Especially, it can promote the performance of tensility torque control in the field of convolution drive, such as paper making and so on, and improve the quality of manufacture.

关 键 词：铁耗 直接转矩控制 动态等效模型 铁耗补偿器 异步电动机 

分 类 号：TM302.2[电气工程—电机]