Research In Variable-frequency Adjustable-speed System Of Storage Battery Locomotive

Storage battery locomotive is an important transport coal instrument. At present, the majority of mine has been using a DC motor speed control. The adjustable-speed of DC is used to control the level string rheostat control; it would consume a large amount of electricity. Increase in the number of charging the battery, reducing battery life, but also affected the efficiency. If instead by asynchoronous motor, use the method of variable-frequency, storage battery locomotive can be installed for feedback-function, we can save a lot of electricity. This paper will aim at this subject for analysing and discussing.In view of the characteristics of storage battery locomotive drive system using an advanced AC frequency converter program: Direct Torque Control (DTC), which directly to control the motor stator flux and torque, the method of DTC avoid the computational complexity of the transformation parameters, which control structure is very simple.First, the author analysis of the four quadrant characteristics of asynchoronous motor, analyzing the mechanical characteristics at the axis composed by torque and speed, discussing renewable energy issues about the asynchoronous motor. The simulation models of approximate circle flux control system are presented based on the application of MATLAB/Simulink by the author.The feasibility and correctness of this method are testified in theory and the correlative waveforms which can explain the advantage of system are captured too; then use TMSLF2407 achieve speed digital system, Analusing the waveforms and verifying the correctness of system. Experimental results show that AC drive storage battery locomotive have greater traction force, smaller starting current and less energy loss than DC drive's.