Research On Mine Locomotive's Drive System Based On Fuzzy Control Of Parameter Optimization

The DC adjustable-speed control method and AC adjustable-speed control mode with series resistance is mostly applied in mine locomotive's drive system. There are several drawbacks of these methods, such as the high percent of malfunction, the high cost of maintenance, the electric energy waste and inferiors dynamic performance, etc. To deal with these problems, an advanced speed-adjusting scheme is presented based on direct torque control.According to the operating characteristics of mine electric locomotive, linear regulator has difficulty to meet the performance requirements during parameters of motor variations and load disturbance. In paper, a fuzzy controller is designed as speed regulator to replace PID regulator. In order to achieve the best control results, an algorithm based on Integrated of Time Absolute Error(ITAE) performance index and particle swarm optimization(PSO) algorithm is studied to change control rules. Aimed at the limitation of stator resistance identification difficulty in low speed range of direct torque control, the paper gives a solving scheme—stator resistance fuzzy observation, used for estimating the stator resistance, which can also improve the performance at low speed and response quality of system.Simulations about fuzzy direct torque control system have been done. The result proves this control strategy has many advantages such as small torque ripple, fixed switching frequency, small current harmonic distortion and strong regulating capacity at the range of rating load. The system basically satisfies the drive demand of mine electric locomotive. Then, the technology based on Self-optimal fuzzy control is applied in mine locomotive's automatic loading system. The practical result shows that the method can overcome the shortcomings of traditional modes such as small low-speed starting torque, difficulty in starting with speed. And this method has the advantages of great starting torque, excellent braking performance, broad scope of application, high technology performance index, etc. Therefore, the optimization fuzzy Direct Torque Control mine electric locomotive traction control system must have broad prospect of application.