摘要
在感应电机的直接转矩控制中,为了提高定子磁链观测的准确性,引入一种混合定子磁链观测模型解决电压-电流磁链模型与电流-转速磁链模型之间平滑切换的问题;同时,针对传统滞环直接转矩控制开关表中可选电压矢量数量少,且固定采样周期内作用时间不合理的缺点,运用离散空间电压矢量调制技术(DSVM),在改进原有电压矢量开关表的基础上获得了更多的有效电压矢量。利用Matlab仿真工具对系统进行了仿真研究,结果表明:与传统滞环直接转矩控制相比,转矩脉动有所降低。最后,通过实验验证了方案的可行性。
In direct torque control（DTC） schemes for induction machine,a hybrid stator flux linkage model is presented to solve the transition between voltage-current-based model and current-speed-based model,so the accuracy of flux estimation is improved.Meanwhile,the number of available voltage vectors is limited and its duration time is unreasonable in conventional direct torque control scheme,so more effective voltage vectors,which are based on improved switching table,can be obtained by using discrete space vector modulation technique.The comparative simulation results show the reduction of torque ripple comparing with conventional scheme.Finally,some experiments are carried out to confirm the effectiveness of the presented method.
出处
《电工技术学报》
EI
CSCD
北大核心
2010年第11期62-67,共6页
Transactions of China Electrotechnical Society
基金
"十一五"国家科技支撑计划重大资助项目(2006BAA01A18)
关键词
直接转矩控制
感应电机
混合定子磁链模型
离散空间电压矢量调制
Direct torque control
induction machine
hybrid stator flux linkage model
discrete space vector modulation
