基于SVPWM技術的交流調速的仿真研究

電氣自動化論文編號:ZD850    論文字數:16613,頁數:37

 目  錄
摘  要 I
1  緒論 1
1.1 交流電氣傳動技術的發展現狀 1
 1.1.1 交流調速系統的現狀 1
 1.1.2 脈寬調制技術在交流調速中的應用現狀 2
1.2 MATLAB計算機仿真 3
 1.2.1 MATLAB仿真軟件簡介 3
 1.2.2 MATLAB下的SIMULINK軟件包 3
1.3 本論文研究的意義及任務 4
2  交流調速控制方式和異步電機數學模型 5
2.1 異步電機調速的基本控制方式 5
2.2 異步電機數學模型 6
2.3矢量控制系統的基本思想 10
2.4 按轉子磁場定向的矢量控制的實現 11
3  電壓空間矢量脈寬調制技術 15
3.1 變壓變頻調速系統中的脈寬調制技術 15
3.2 正弦波脈寬調制技術 15
3.3 電壓空間矢量脈寬調制技術 16
4  SVPWM下的VVVF的仿真 25
4.1 異步電機矢量控制方式下的仿真模型 25
4.2  SVPWM的MATLAB仿真模型 25
5  結論 30

摘  要
 隨著半導體技術的快速發展，特別是數字信號處理器的出現，以及精確的異步電機模型和各種先進的控制策略的提出，很大的促進了電機控制的發展，使得精度高、調速范圍寬、控制性能好的電機控制器的實現成為可能。    矢量控制作為一種先進的控制策略，是在電機統一理論、機電能量轉換和坐標變換理論的基礎上發展起來的，具有先進性、新穎性和實用性的特點。其思想就是將異步電動機的模型通過坐標變換，使之成為直流電動機模型，將定子電流矢量分解為按轉子磁場定向的兩個直流分量并分別加以控制，以期達到直流電機的控制效果。                                                                       本文介紹了交流變頻調速的發展概況，異步電機的矢量控制策略，詳細介紹了SVPWM 技術的原理，對SVPWM 技術進行了深入的分析和研究，并給出了一種新型的SVPWM 的實現算法。    通過MATLAB / SIMULINK 仿真軟件，根據矢量控制原理，給出了基于SVPWM 的異步電機變頻調速原理圖，構建出各個功能實現的子模塊，并設計了各個子模塊的參數，結合SVPWM 算法，得到基于SVPWM 的異步電機變頻調速仿真模型，進行了仿真實驗，得出實驗結果并對結果進行了分析。
關鍵詞：矢量控制；變頻調速；MATLAB / SIMULINK ； SVPWM

 Abstract
 With the development of semiconductor technique, and the TMS320LF2407 DSP controller, the accurate asynchronous motor model and all kinds of advanced theories that have resulted in the development of a highly reliable drive with highly accurate and variable speed controls.     Vector Control System (VC) is one of the advanced theories, which is based on motor unification principle, energy conversion and vector coordinate transformation theory, It has many advantages such as novelty, practicability and advancement, By transforming the model of AC motor to DC motor, the stator current is decomposed into two DC parts which are orientated towards the rotor magnetic field and controlled respectively. Thus the magnetic flux and torque are decoupled. In which way, it controls the asynchronous motor in a synchronous way.     This thesis introduces the correlative information of variable frequency speed regulating, vector control system of asynchronous motor, and expatiate Space Vector Pulse Width Modulation (SVPWM). The principle of SVPWM is in - depth discussed, and the algorithm for SVPWM is ratiocinated.     By using MATLAB / SIMULINK dynamic simulation software, through the principle of the vector control system, get the structure model of variable frequency speed regulating system of asynchronous motor based on SVPWM, given all the detailed subschema and plan all the data, using the algorithm for SVPWM, the simulated model of variable frequency speed regulating system fed by SVPWM inverter is set up for asynchronous machine. Through the simulated model, get the result and analyzed it in detail.     On the side of software, the module software is written by assembly language and C code so that can be amended and replanted easily.
Key Words : Vector Control ；Variable Frequency Speed Regulating; MATLAB / SIMULINK; Space Vector Pulse Width Modulation