【正文】 I 異步電動機 SPWM 變頻調(diào)速原理與仿真分 析 摘 要 在分析 SPWM 原理的基礎(chǔ)上， 利用 MATLAB/SIMULINK 軟件構(gòu)造了 SPWM 調(diào)速系統(tǒng)的仿真模型 并 說明了規(guī)則采樣法的可行性。 該模型 主要利用 S函數(shù)模擬自然采樣法和規(guī)則采樣法的控制規(guī)則并應(yīng)用電力系統(tǒng)工具箱構(gòu)建逆變橋和電機， 能夠比較好的模擬真實的系統(tǒng) 并 實現(xiàn)變頻調(diào)速的功能。 通過對仿真結(jié)果的分析，對比自然采樣法和規(guī)則采樣法控制性能的差異，得出了規(guī)則采樣法 在 工程實際 中 應(yīng)用的可行性 。 關(guān)鍵詞： SPWM，異步電機， MATLAB，仿真，規(guī)則采樣法，自然采樣法 II The Simulation and Analysis of the Fundmental Principle of Asynchronous Motor SPWM Speed Adjusting ABSTRACT Base on analizing SPWM principle, the SPWM velocity modulation system39。s simulation model has been constructed by using the MATLAB/SIMULINK analizing the results of simulation,the feasibility of the regular sample law is given out. This model mainly uses the S function analogue natural sampling law and the regular sampling method control rule and construct inverter and machine ,this model can simulate the real system and realize the frequency conversion velocity modulation function. The simulation results is given out in this paper, though analizing the simulation results and constrasting the difference of the control performance of natural sampling law and regular sampling,the application feasibility of the regular sampling law in the project has been obtained. KEYWORDS: SPWM ,aynchronous motor,MATLAB,simulation, regular sampling law, ntural sampling law III 目 錄 摘 要 ........................................................................................................................................... I ABSTRACT ...............................................................................................................................II 1 緒論 ........................................................................................................................................ 1 交流調(diào)速系統(tǒng)的發(fā)展 ................................................................................................... 1 交流調(diào)速系統(tǒng)的基本類型 ........................................................................................... 2 異步電動機調(diào)速系統(tǒng)的基本類型 .................................................................... 2 同步電動機調(diào)速的基本類型 ............................................................................ 4 2 Siulink 仿真基礎(chǔ) .................................................................................................................... 5 Simulink 簡介 ................................................................................................................ 5 Simulink 啟動 ..................................................................................................... 5 Simulink 組成 ..................................................................................................... 5 仿真過程 ............................................................................................................ 6 Simulink 模塊庫簡介 ................................................................................................... 6 電力系統(tǒng)工具箱簡介 ................................................................................................... 6 S函數(shù)簡介 .................................................................................................................... 6 S函數(shù)的基本概念 .............................................................................................. 6 S函數(shù)的使用 ...................................................................................................... 7 與 S函數(shù)相關(guān)的一些術(shù)語 ................................................................................ 7 S函數(shù)的工作原理 .............................................................................................. 8 編寫 M 文件 S函數(shù) .......................................................................................... 9 3 異步電 動 機變壓變頻調(diào)速系統(tǒng) .......................................................................................... 11 概述 ............................................................................................................................. 11 變壓變頻調(diào)速的基本控制方式 ................................................................................. 11 基頻以下調(diào)速 .................................................................................................. 11 基頻以上調(diào)速 .................................................................................................. 12 異步電動機電壓－頻率協(xié)調(diào)控制時的機械特性 ..................................................... 12 4 PWM 控制技術(shù) ..................................................................................................................... 15 正弦脈寬調(diào)制原理及其優(yōu)點 .................................................................................... 15 SPWM 原理 ...................................................................................................... 15 SPWM 的優(yōu)點 .................................................................................................. 18 關(guān)于 SPWM 的開關(guān)頻率 ................................................................................. 19 同步調(diào)制和異步調(diào)制 ................................................................................................ 19 IV 異步調(diào)制 .......................................................................................................... 19 同步調(diào)制 .......................................................................................................... 19 分段同步調(diào)制 .................................................................................................. 20 SPWM 波形的生成 .................................................................................................... 20 自然采樣法 ...................................................................................................... 20 規(guī)則采樣法 ...................................................................................................... 21 5 異步電動機 SPWM 變頻調(diào)速仿真系統(tǒng)的設(shè)計 ................................................................ 23 自然采樣法系統(tǒng)的設(shè)計 ..................................................