The Key Technology to Speed Sensor-less Vector Control of Locomotive Traction

摘要

The switching frequency of high power traction driving system is very low. Aiming to improve the performance of speed sensor-less vector control in the case of low switching frequency (for example, it is low to 500 Hz), this paper introduces these technologies, such as multi-mode modulation strategy based on space vector pulse width modulation(SVPWM), design of the current regulator based on complex vector, and full-order stator flux observer. As a result, the motor can run over modulation, field current and torque current are effectively decoupled, and the flux and speed of motor are accurately estimated. Simulation and the recent project practices have proved this control system has a good operating performance.