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High Performance AC Servo System And Its Advanced Mixed Practical Control Strategy

Posted on:2006-11-14Degree:DoctorType:Dissertation
Country:ChinaCandidate:Y J CengFull Text:PDF
GTID:1102360152490845Subject:Control theory and control engineering
Abstract/Summary:PDF Full Text Request
AC motor is a high order, nonlinear, coupling system, so the control strategy is most important in AC servo systems. A single control strategy can hardly get ideal control effect, but if we take the advantages of different control methods and combine them together to form mixed control system, higher control performance is expected.In this dissertation, to overcome the parameter variations in AC drive systems, some new efforts are made. The goal of the study is to improve the robustness of AC drive system and meet the increasing demand of high performance on AC drivers.PID control is the eldest and most widely used control method. However, traditional PID control has its own defects. To get better control effect, this paper designs such an AC servo system with a nonlinear PID controller based on IGA optimization. Both dynamic and steady performances are improved evidently and the results are satisfactory.Fuzzy control is one of most important intelligent controls, it has been developing rapidly and been used widely with remarkable achievement due to its strong robustness, succinct algorithm and real-time characteristic. But it is a pity that traditional fuzzy control has disadvantages such as low precision and limited adaptability at the same time. In chapter 4, an improved mixed fuzzy control is put forward with much better control performance.In the fifth chapter, a new multi-controller coordinating control method is presented. Unlike the controller switched in some point, this method make it possible to switch one controller to another more smoothly with a RBF coordinator. Satisfactory results are obtained as expect.After a curt introduction of the software and hardware of the experiment, the results are given in chapter 6.At the end of the dissertation, a brief summary is made and some problems to be researched further are pointed out.
Keywords/Search Tags:AC servo system, Vector Control, Direct Torque Control, Combined Control, PID Control, GA, IGA, Fuzzy Control, Coordinating Control, high performance, DSP
PDF Full Text Request
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