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分析了速度传感器在机车运行中故障率较高从而导致牵引传动控制设备可靠性降低的现状,介绍了无速度传感器技术应用于轨道牵引传动系统的优点。在异步电动机Γ型等效电路模型基础上,构建Luenberger自适应状态观测器,得到状态偏差的方程。通过李亚普诺夫稳定性理论,推导出一种无速度传感器控制的速度自适应辨识算法。在TMS320C31和TMS320F240构成的双微机控制平台上,对提出的无速度传感器控制算法进行了全数字化实现,利用大功率IGBT牵引逆变器和异步牵引电动机对无速度传感器直接转矩控制进行了试验研究。试验结果表明,该系统具有优异的性能。最后分析了影响转速辨识精度和实际应用的2个关键问题:逆变器死区效应及补偿方法;低速再生区稳定运行。
The status of speed sensor with high failure rate in locomotive operation is analyzed and the reliability of traction drive control equipment is reduced. The advantages of speed sensorless technology in track traction drive system are introduced. Based on the Γ equivalent circuit model of asynchronous motor, a Luenberger adaptive state observer is constructed and the equation of state deviation is obtained. Based on Lyapunov stability theory, a speed adaptive identification algorithm without speed sensor is derived. Based on the dual microcomputer control platform consisting of TMS320C31 and TMS320F240, the proposed speed sensorless control algorithm is fully digitalized. The research of speedless sensor direct torque control using high power IGBT traction inverter and asynchronous traction motor . The test results show that the system has excellent performance. Finally, two key problems that affect speed identification accuracy and practical application are analyzed: inverter dead zone effect and compensation method; low-speed regeneration zone stable operation.