摘要
在感应电机定子磁链的旋转坐标系里,采用定子磁链旋转坐标变换简化系统结构,分析了基于高开关频率逆变器的间接定子量控制原理。采用能同时观测定子磁链和转子磁链的u-n模型,计算出电机磁链物理量,并在SVPWM过调制区增加逆变器输出电压的非线性补偿环节,改善了逆变器的线性程度。实验结果表明定子电流为正弦波且谐波和转矩脉动小,且具有良好的稳、动态响应性能。在具有较高开关频率的中小功率应用场合有着非常好的应用前景。
The principle of stator-flux-oriented indirect stator-quantities control at high switching frequency of power inverter, which is simple by stator flux transformation, is analyzed in stator-flux-oriented coordinates of the induction motor. The u-n model that can observe the stator and rotor flux accurately is calculated for the motor flux. By increasing the nonlinear compensatory part of inverter output voltage in SVPWM overmodulation method , the linear re- lation of inverter is improved. Experiment results show the stator current is with few harmonics, the torque has small ripple. The control scheme is viable and has good dynamic and steady response performance, had a good application prospect in the middle and small power application with high switching frequency.
出处
《仪器仪表学报》
EI
CAS
CSCD
北大核心
2009年第3期658-662,共5页
Chinese Journal of Scientific Instrument
关键词
间接定子量控制
u-n模型
空间电压矢量调制
过调制
indirect stator-quantities control
u-n model
space vector pulse width modulation
over modulation
