基于滑模定子电阻观测器的直接转矩控制

为了解决定子电阻变化对磁链估算的影响,在永磁同步电动机直接转矩控制系统的基础上,提出了滑模自适应定子电阻观测器;给出了理论证明,并推导出定子电阻自适应率;最后对其进行仿真.仿真结果表明,定子电阻滑模自适应观测器增强了系统对定子电阻变化的自适应性能,克服了定子电阻变化对磁链估算的影响,有效地提高了系统输出转矩的控制精度.

Direct Torque Control Based on Sliding Mode Stator Resistance Observer

In the direct torque controlled interior permanent magnet synchronous motor drive system, the estimation of the electromagnetic torque and stator flux was dependent only on one machine parameter, stator resistance. The variation of the stator resistance deteriorated the performance of the drive by introducing errors in the estimated flux linkages magnitude and its position and hence in the electromagnetic torque resistance change also skewed the torque linearity thus making the motor drive a less than ideal torque amplifier. In order to solve the problem, a sliding mode adaptive resistance observer was proposed in this paper. The validity of this scheme was proved through theory demonstration and computer simulation. The simulation results showed that this scheme was very effective.