本文選題：交流感應(yīng)電機(jī) + 直接轉(zhuǎn)矩控制改進(jìn)方法��； 參考：《湖南工業(yè)大學(xué)》2014年碩士論文

【摘要】：繼矢量控制技術(shù)之后，直接轉(zhuǎn)矩控制作為一種新興的控制方法省去了復(fù)雜頻繁的坐標(biāo)變換，具有結(jié)構(gòu)簡(jiǎn)單、動(dòng)態(tài)響應(yīng)快等特點(diǎn)，但其轉(zhuǎn)矩脈動(dòng)大、低速性能差，為此分析了磁鏈軌跡為圓形的直接轉(zhuǎn)矩控制改進(jìn)方法。安裝速度傳感器所帶來(lái)的缺陷引發(fā)人們考慮用軟件方法來(lái)代替速度傳感器，，因此，無(wú)速度傳感器技術(shù)成為當(dāng)今的熱門(mén)研究話題之一。如何準(zhǔn)確獲取交流感應(yīng)電機(jī)的轉(zhuǎn)速信息成為無(wú)速度傳感器技術(shù)的關(guān)鍵問(wèn)題，本文對(duì)所構(gòu)造的轉(zhuǎn)速估算方法進(jìn)行了研究。 論文首先對(duì)目前的交流調(diào)速方法進(jìn)行概述，闡述了各種磁鏈觀測(cè)器和無(wú)速度傳感器技術(shù)，并對(duì)各種方案進(jìn)行簡(jiǎn)要分析，同時(shí)，討論不同磁鏈觀測(cè)器的原理及其優(yōu)缺點(diǎn)，并比較它們的仿真結(jié)果和實(shí)驗(yàn)結(jié)果，選擇全階磁鏈觀測(cè)器作為本研究系統(tǒng)中的磁鏈估算方法。 其次，從建立的交流感應(yīng)電機(jī)數(shù)學(xué)模型角度出發(fā)，采用了直接轉(zhuǎn)矩控制改進(jìn)方法，并詳細(xì)分析了該方法的工作原理，在MATLAB環(huán)境下對(duì)直接轉(zhuǎn)矩控制改進(jìn)方法進(jìn)行仿真建模。文中利用PI控制器調(diào)節(jié)電機(jī)的轉(zhuǎn)速信號(hào)，為了使系統(tǒng)獲得更好的動(dòng)態(tài)性能，提出用單神經(jīng)元PI控制方法來(lái)調(diào)節(jié)轉(zhuǎn)速信號(hào)。通過(guò)對(duì)兩種速度辨識(shí)方案的仿真結(jié)果比較，驗(yàn)證了全階磁鏈觀測(cè)器的速度辨識(shí)具有辨識(shí)效果好、動(dòng)態(tài)響應(yīng)快、穩(wěn)態(tài)精度高等優(yōu)點(diǎn)。 最后，利用TI公司的TMS320F2812構(gòu)建交流傳動(dòng)實(shí)驗(yàn)平臺(tái)，對(duì)研究系統(tǒng)進(jìn)行軟件編程，在不同轉(zhuǎn)速情況下對(duì)所設(shè)計(jì)方法進(jìn)行實(shí)驗(yàn)，實(shí)驗(yàn)結(jié)果驗(yàn)證了控制方法的正確性和可行性。
[Abstract]:After vector control technology, direct torque control (DTC), as a new control method, eliminates complex and frequent coordinate transformation and has the advantages of simple structure and fast dynamic response, but its torque ripple is large and its low speed performance is poor. An improved method of direct torque control with circular flux locus is analyzed. The defects caused by the installation of speed sensors have led people to consider using software instead of speed sensors. Therefore, speed sensorless technology has become one of the hot research topics. How to accurately obtain the rotational speed information of AC induction motor becomes a key problem in speed sensorless technology. In this paper, the method of speed estimation is studied. Firstly, the paper summarizes the current AC speed regulation methods, describes various flux observer and speed sensorless technology, and briefly analyzes the various schemes. At the same time, discusses the principle of different flux observer and its advantages and disadvantages. The simulation results and experimental results are compared, and the full order flux observer is selected as the flux estimation method in this research system. Secondly, from the point of view of the established mathematical model of AC induction motor, the improved method of direct torque control is adopted, and the working principle of the method is analyzed in detail. The simulation model of the improved method of direct torque control is carried out in MATLAB environment. In this paper, Pi controller is used to adjust the speed signal of motor. In order to obtain better dynamic performance of the system, a single neuron Pi control method is proposed to adjust the speed signal. By comparing the simulation results of two speed identification schemes, it is verified that the speed identification of the full order flux observer has the advantages of good identification effect, fast dynamic response and high steady-state precision. Finally, using TMS320F2812 of TI Company to construct the AC drive experiment platform, the software of the research system is programmed, and the design method is tested under different rotational speed. The experimental results verify the correctness and feasibility of the control method.
【學(xué)位授予單位】：湖南工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類(lèi)號(hào)】：TM346

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本文編號(hào)：2111002