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Direct Torque Control Based on Frequency Control System Shearer

Author: OuZuoZuo
Tutor: WangQingLing
School: Anhui University of Technology
Course: Control Theory and Control Engineering
Keywords: Shearer Constant Power Control PWM Rectifier Direct Torque
CLC: TM921.51
Type: Master's thesis
Year: 2008
Downloads: 356
Quote: 1
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Abstract


Shearer is to achieve coal production mechanization and modernization of the important equipment. Shearer technology development chain from the chain traction to no traction, and then developed into power by the hydraulic traction traction. Since electrical haulage shearer has more advantages, so the world's major coal mining States have developed various forms of electric traction shearer. Electrical Traction Coal Mining in two ways: DC traction and AC traction. DC traction motor is a DC-DC converter systems, AC squirrel cage induction motor traction is the use of AC-DC variable speed system. DC traction advantages of simple control, speed performance, but the DC motor bulky, complex structure, poor reliability, and in the underground maintenance, repair difficult workload. AC traction uses a squirrel-cage motor, small size, explosion-proof, simple structure, reliable operation, long life, easy maintenance. In the same dimensions, the AC motor power can be made larger, is conducive to a high-power electric haulage shearers, high reliability direction. Mainly in its technical difficulty variable speed AC motor drive system. Direct Torque Control (DTC) technology does not require an AC motor is equivalent to a DC motor, thereby eliminating the vector rotation transformation of many complex calculations; no analog DC motor control, no need for the decoupling and simplified AC motor The mathematical model. System is simple, but it can produce very fast dynamic response. Therefore, this article will Shearer direct torque control system as a research topic. Topics can be divided into two parts rectifier and inverter. Rectifier uses a reversible PWM rectifier; inverter part of the direct torque control scheme. First, Shearer AC drive system for the characteristics of the shearer constant power control strategy. PWM rectifier discussed in detail the basic principle of the reversible phase voltage-type PWM rectifier with vector control strategies. Using Matlab software finisher performance simulation model for a comprehensive and systematic analysis. Based on both TMS320LF2407DSP, designed the system hardware and software, systematic experimental study. In addition, discusses the asynchronous motor direct torque control system, the basic composition and working principle. Using asynchronous motors α-β coordinate system flux and torque observation model, based on circular flux trajectory control program, combined with the characteristics of shearer speed control system, the use of direct torque build MATLAB6.5/Simulink5.0 speed control system simulation model, proposed measures to reduce the torque ripple of the system.

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CLC: > Industrial Technology > Electrotechnical > Electrification,electrical energy application > Electric drive ( electric drive ) > Control system > Variable frequency control system
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