摘要
感应电机调速控制中的一个关键问题是如何克服转子电阻不确定的影响,准确地观测转子磁链。该文采用扩张状态观测器的方法,提出了一种新的转子磁链观测器。对电机方程中的定子电流动态方程进行整理,把包含转子电阻的不确定项综合在一起,并扩张成一阶新的状态,与原方程组成增广一阶的系统。对于新的系统,应用扩张状态观测器观测出原系统的不确定部分,使系统确定化,最后得到准确的转子磁链观测值。高速和低速下的仿真结果都表明该文的方法对转子电阻的变化具有极强的鲁棒性,可以在转子电阻不确定时对转子磁链进行准确观测。
This paper proposed a robust rotor flux observer for induction motors. The variation of the rotor resistance during operation degrades the performance of the flux observer and the controller. The uncertain component including rotor resistance in the stator current equation is extended to a new state with unknown dynamic. A close loop flux observer, based on the Extended State Observer, is then constructed. By the nonlinear feedback of the current estimate error, the uncertain component converges to its actual value and the accurate rotor flux is obtained. The performance of this observer is not degraded by the rotor resistance uncertainty. Simulations under high and low speed show that the proposed method achieves the correct estimation of the rotor flux with the perfect robustness.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2003年第4期145-147,共3页
Proceedings of the CSEE
