本文選題：異步電機(jī) + 矢量控制　； 參考：《河北工程大學(xué)》2014年碩士論文

【摘要】：異步電機(jī)具有可靠性高、制造成本低、維護(hù)方便等優(yōu)點(diǎn)，在交流調(diào)速領(lǐng)域廣泛應(yīng)用。但異步電機(jī)是一個(gè)強(qiáng)耦合的時(shí)變系統(tǒng)，不能將勵(lì)磁電流與轉(zhuǎn)矩電流分開(kāi)控制，這使得異步電機(jī)的數(shù)學(xué)模型在調(diào)速過(guò)程中存在偏差，在控制精度較高的場(chǎng)合，調(diào)速性能不能滿足要求。 異步電動(dòng)機(jī)矢量控制可以解決交流控制系統(tǒng)中定轉(zhuǎn)子磁鏈耦合問(wèn)題，提高交流調(diào)速系統(tǒng)控制性能。但異步電動(dòng)機(jī)矢量控制控制系統(tǒng)要獲得良好的調(diào)速控制性能還需依賴于精確電機(jī)參數(shù)，在電機(jī)在運(yùn)行過(guò)程中，，不可避免地會(huì)出現(xiàn)不確定性干擾以及由于溫度升高等導(dǎo)致的電機(jī)參數(shù)的變化等問(wèn)題，這些都將使調(diào)速控制系統(tǒng)控制性能下降。滑模變結(jié)構(gòu)控制對(duì)系統(tǒng)數(shù)學(xué)模型要求不高，且對(duì)電機(jī)參數(shù)變化具有很好的魯棒性。為了進(jìn)一步增強(qiáng)系統(tǒng)的抗干擾能力，提高驅(qū)動(dòng)系統(tǒng)的控制性能，本文將異步電機(jī)矢量控制系統(tǒng)的和改進(jìn)滑模變結(jié)構(gòu)控制策略結(jié)合進(jìn)行了研究。 本文首先對(duì)異步電機(jī)矢量控制原理進(jìn)行了分析并在MATLAB/Simulink仿真軟件中建立了異步電機(jī)矢量控制系統(tǒng)模型。其次本文第三章通過(guò)對(duì)大量文獻(xiàn)以及控制系統(tǒng)仿真研究得出滑模變結(jié)構(gòu)控制雖然對(duì)電機(jī)模型要求不高具有較好的魯棒性但存在抖振。為了減小控制系統(tǒng)抖振問(wèn)題，本文第四章建立了基于改進(jìn)的滑模變結(jié)構(gòu)控制的控制器。改進(jìn)的滑模變結(jié)構(gòu)控制器在常規(guī)滑模變結(jié)構(gòu)控制器中增加了改進(jìn)的切換項(xiàng)函數(shù)。切換項(xiàng)函數(shù)采用了改進(jìn)的指數(shù)趨近律，該趨近律的趨近速度能很好的反應(yīng)出系統(tǒng)當(dāng)前狀態(tài)與滑模面的距離，能根據(jù)狀態(tài)量與滑模面之間的距離自動(dòng)調(diào)節(jié)趨近速度。最后為了對(duì)改進(jìn)的混合滑模變結(jié)構(gòu)器性能進(jìn)行研究，第五章利用MATLAB/Simulink仿真軟件在異步電機(jī)矢量控制系統(tǒng)中分別建立了PI控制器，常規(guī)滑模變結(jié)構(gòu)控制器以及改進(jìn)的滑模變結(jié)構(gòu)控制器模型。并對(duì)系統(tǒng)速度跟蹤，正反轉(zhuǎn)，增加負(fù)載等工況下系統(tǒng)控制性能進(jìn)行了仿真。仿真結(jié)果表明改進(jìn)的滑模變結(jié)構(gòu)控制器能有效的加快系統(tǒng)跟蹤速度，改善系統(tǒng)動(dòng)態(tài)調(diào)速能力，增強(qiáng)系統(tǒng)魯棒性。
[Abstract]:The asynchronous motor has the advantages of high reliability, low manufacturing cost and convenient maintenance, so it is widely used in the field of AC speed regulation. However, the induction motor is a time-varying system with strong coupling. The excitation current and torque current can not be controlled separately, which makes the mathematical model of the induction motor deviate in the course of speed regulation, and the control accuracy is high. Speed regulation performance can not meet the requirements. Vector control of asynchronous motor can solve the coupling problem of stator and rotor flux in AC control system and improve the control performance of AC speed regulating system. However, in order to obtain good speed control performance of asynchronous motor vector control system, it is necessary to rely on precise motor parameters. There will inevitably be some problems such as uncertainty disturbance and the change of motor parameters due to the increase of temperature. All of these will make the control performance of the speed control system degrade. Sliding mode variable structure control (VSC) requires not only the mathematical model of the system, but also has good robustness to the variation of motor parameters. In order to further enhance the anti-interference ability of the system and improve the control performance of the drive system, the vector control system of asynchronous motor and the improved sliding mode variable structure control strategy are studied in this paper. In this paper, the principle of vector control of asynchronous motor is analyzed, and the model of vector control system of asynchronous motor is established in MATLAB/Simulink simulation software. Secondly, the third chapter of this paper through a lot of literature and control system simulation research, it is concluded that the sliding mode variable structure control has good robustness to the motor model, but there exists buffeting. In order to reduce the buffeting problem of control systems, a controller based on improved sliding mode variable structure control is established in chapter 4. The improved sliding mode variable structure controller adds an improved switching term function to the conventional sliding mode variable structure controller. The switching term function adopts an improved exponential approach law. The approach speed of the law can well reflect the distance between the current state of the system and the sliding mode surface, and can automatically adjust the approach velocity according to the distance between the state quantity and the sliding mode surface. Finally, in order to study the performance of the improved hybrid sliding mode converter, in chapter 5, Pi controllers are established in the vector control system of asynchronous motor using MATLAB/Simulink simulation software. Conventional sliding mode variable structure controller and improved sliding mode variable structure controller model. The control performance of the system is simulated under the conditions of speed tracking, forward and reverse rotation and increasing load. The simulation results show that the improved sliding mode variable structure controller can effectively accelerate the tracking speed of the system, improve the dynamic speed of the system and enhance the robustness of the system.
【學(xué)位授予單位】：河北工程大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM343

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