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Induction motor DTC system simulation modeling and performance improvement research

Author: DingXiang
Tutor: GuiWeiHua
School: Central South University
Course: Control Theory and Control Engineering
Keywords: Asynchronous motor Direct Torque Control MATLAB simulation Flux trajectory
CLC: TM343
Type: Master's thesis
Year: 2005
Downloads: 468
Quote: 4
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Abstract


Direct Torque Control (DTC) is another high-performance AC speed following the vector control method , which is based on the stator flux-oriented , simple mathematical model , the robustness of the control object parameters control input voltage fluctuation changes low sensitivity , full torque transient control a high level of control features. The past 20 years , this technology has been greatly developed, and has a good application in the high-speed train main drive high power systems . Induction motor DTC system model complex structure, carrying out theoretical research and system development , the control scheme of the simulation is very important . This thesis is based on MATLAB6.5/Simulink , intuitive , simple and high operation speed asynchronous motor direct torque control simulation system is constructed through the S-function programming , provides a good platform for the simulation of various DTC control strategy . In traditional DTC theory , the stator resistance voltage drop , the control effect is not very satisfactory, and the the hexagonal flux brought high harmonics of the control system and the grid can not be overlooked . In this paper, in the low speed range accurately model a circular stator flux , combined with some improvements , such as through the introduction of -120 ° voltage vectors involved in the regulation , and before adding magnetic start , improve torque response dynamics ; speed is adjusted by the limiter PI regulator to reduce the speed overshoot . High-speed domain retraction of 18 gon flux trajectory new program to replace the traditional hexagonal flux trajectory , reducing the magnetic saturation , weaken the high-order harmonics , and basically did not increase the program complexity and switching devices burden. At the same time , high-speed inter-domain without disturbance model switching method . Through in-depth simulation comparative study , this control strategy to make high-power system to obtain a satisfactory control effect .

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CLC: > Industrial Technology > Electrotechnical > Motor > AC motor > Induction motor
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