Research on Automatic Control Method of Braking Resistance Hydraulic Fan for Fully Automatic Running Trains
The fully automatic operation train braking resistor hydraulic fan is a device driven by hydraulic technology.During the train operation process,its performance is influenced by multiple factors,which can easily lead to unstable issues with the output airflow or pressure.Therefore,researching the automatic control technology for fully automatic operation train braking resistor hydraulic fans is of significant importance.On the basis of the force between train and track,a train braking model is constructed to obtain the braking moment,and the relative torsion angle is used as the basis to calculate the spin creep force moment,and the adhesion moment between train wheels and track is calculated according to the instantaneous creep speed.The train driving model is constructed,the objective function of braking torque active distribution is established,the electromagnetic torque of the resistance hydraulic fan is obtained by using Park transform and Clarke transform,and the automatic control of the resistance hydraulic fan is realized by rotor flux linkage and control frequency.The experimental results show that the average fan efficiency and constant speed ratio of the proposed control method are 5.26 s and 99.77％respectively in the process of train braking control.The fan voltage after controlling the resistance is basically consistent with the ideal voltage,which can efficiently and consistently realize the brake resistance hydraulic fan control and improve the safety of the train.
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