【正文】 gly broad applications in industrial production. Cascade speed control is one of the very classic speed control method in asynchronous motor, which can realize stepless smoothing speed. It is a simple and rapid control system with low level of difficulty in techniques and rather perfect performance. Thyristor cascade speed control technology can be used in technical transformation for old equipment in addition to the design of new equipment. Therefore, study and application of thyristor cascade speed control technology are of great technical and economic significance. In this paper, the working principle and the basic performance of cascade speed control system in induction motor are studied emphatically. The dynamic parameters of cascade speed control system using both speed loop and current loop are designed under the condition of known static and dynamic performance requirements. The working process of cascade speed control system with doubleclosedloop is discussed and the simulation for the system performance are made with MATLAB software.Keywords: Asynchronous motor；Cascade Speed Control；Slip power feedback；MATLAB simulation目 錄1 緒論 ....................................................................................................................................1 交流調(diào)速系統(tǒng)的發(fā)展 .............................................................................................1 交流調(diào)速技術(shù)現(xiàn)狀 .................................................................................................1 課題研究意義 .........................................................................................................2 課題分析與研究計(jì)劃 .............................................................................................3 社會(huì)經(jīng)濟(jì)效益分析 .................................................................................................32 串級(jí)調(diào)速的基本原理 ........................................................................................................5 交流調(diào)速方式 .........................................................................................................5 異步電動(dòng)機(jī)串級(jí)調(diào)速原理 .....................................................................................6 串級(jí)調(diào)速的各種基本運(yùn)行狀態(tài)及功率傳遞關(guān)系 .................................................8 串級(jí)調(diào)速系統(tǒng)的基本類型 ...................................................................................10 串級(jí)調(diào)速系統(tǒng)方案的確定 ...................................................................................113 串級(jí)調(diào)速系統(tǒng)的調(diào)速特性和機(jī)械特性 ..........................................................................13 串級(jí)調(diào)速系統(tǒng)轉(zhuǎn)子整流電路的工作狀態(tài) ...........................................................13 串級(jí)調(diào)速系統(tǒng)的調(diào)速特性 ...................................................................................14 次同步串級(jí)調(diào)速系統(tǒng)的機(jī)械特性 .......................................................................15 異步電動(dòng)機(jī)在自然接線方式下的最大轉(zhuǎn)矩 ............................................16 串級(jí)調(diào)速異步電動(dòng)機(jī)工作在第一工作區(qū)內(nèi)的機(jī)械特性 ........................16 串級(jí)調(diào)速異步電動(dòng)機(jī)工作在第二工作區(qū)內(nèi)的機(jī)械特性 ........................184 控制環(huán)節(jié)單元電路研究 ..................................................................................................20 反饋檢測(cè)裝置 .......................................................................................................20 電流檢測(cè)裝置 ............................................................................................20 轉(zhuǎn)速檢測(cè)環(huán)節(jié) ............................................................................................20 電流、速度調(diào)節(jié)器結(jié)構(gòu)選擇 ...............................................................................21 電流調(diào)節(jié)器 ACR 的結(jié)構(gòu) ..........................................................................21 速度調(diào)節(jié)器 ASR 的結(jié)構(gòu) ..........................................................................21 給定積分器 ...........................................................................................................225 次同步串級(jí)調(diào)速系統(tǒng)的工程設(shè)計(jì)研究 ..........................................................................23 系統(tǒng)電路及原理圖設(shè)計(jì) .......................................................................................23 實(shí)驗(yàn)調(diào)試及數(shù)據(jù)分析 ...........................................................................................24 直流測(cè)速發(fā)電機(jī)的工作特性 ....................................................................24 串級(jí)調(diào)速系統(tǒng)開(kāi)環(huán)工作機(jī)械特性 ............................................................26 串級(jí)調(diào)速系統(tǒng)單閉環(huán)工作機(jī)械特性 ........................................................27 串級(jí)調(diào)速系統(tǒng)雙閉環(huán)工作機(jī)械特性 ........................................................30 串級(jí)調(diào)速系統(tǒng)的 MATLAB 仿真研究 ................................................................33 用 MATLAB 建立雙閉環(huán)串級(jí)調(diào)速系統(tǒng)的仿真模型 .............................33 系統(tǒng)仿真波形及其分析 ............................................................................35結(jié) 論 ................................................................................................................................39參考文獻(xiàn) ..............................................................................................................................40致 謝 ................................................................................................................................41附錄 MATLAB 簡(jiǎn)介 ..........................................................................................................42 1 緒論 交流調(diào)速系統(tǒng)的發(fā)展直流電氣傳動(dòng)和交流電氣傳動(dòng)在 19 世紀(jì)先后誕生。串級(jí)調(diào)速是異步電動(dòng)機(jī)十分經(jīng)典的調(diào)速方法之一，它可以實(shí)現(xiàn)無(wú)級(jí)平滑調(diào)速，是結(jié)構(gòu)簡(jiǎn)單、發(fā)展較快、技術(shù)難度較小、性能比較完善的一種控制系統(tǒng)。串級(jí)調(diào)速技術(shù)除可用于新設(shè)備設(shè)計(jì)外，還可用于對(duì)舊設(shè)備進(jìn)行技術(shù)改造。在 20 世紀(jì)上半葉，鑒于直流電動(dòng)機(jī)優(yōu)良的調(diào)速性能和轉(zhuǎn)矩控制性能，在高精度可調(diào)速的拖動(dòng)技術(shù)領(lǐng)域中，相當(dāng)長(zhǎng)時(shí)期內(nèi)幾乎都采用直流電動(dòng)機(jī)。交流電動(dòng)機(jī)與直流電動(dòng)機(jī)相比具有結(jié)構(gòu)簡(jiǎn)單、堅(jiān)固耐用、經(jīng)濟(jì)可靠等突出優(yōu)點(diǎn)，且能在惡劣的甚至在有易燃易爆性氣體的環(huán)境中安全運(yùn)行，因而被廣泛應(yīng)用，幾乎所有不調(diào)速的拖動(dòng)場(chǎng)合都采用交流電動(dòng)機(jī)。目前交流電力拖動(dòng)系統(tǒng)已具備了較寬的調(diào)速范圍、較高的穩(wěn)態(tài)精度、較快的動(dòng)態(tài)響應(yīng)、較高的工作效率等優(yōu)異性能，交流傳動(dòng)控制系統(tǒng)逐步取代直流調(diào)速已成為明顯的發(fā)展趨勢(shì)。近幾年來(lái)，各國(guó)學(xué)者正致力于無(wú)速度傳感器控制系統(tǒng)的研究，利用檢測(cè)定子電壓、電流等容易測(cè)量的物理量進(jìn)行速度估算，以取代速度傳感器。 課題研究意義在異步電動(dòng)機(jī)的各種調(diào)速技術(shù)中，變頻技術(shù)具有調(diào)速精度高、特性硬和可靠性高等特點(diǎn)，應(yīng)用十分廣泛。串級(jí)調(diào)速是一種簡(jiǎn)單實(shí)用又經(jīng)濟(jì)的交流異步電動(dòng)機(jī)調(diào)速方法，它是在轉(zhuǎn)子回路中串入附加電動(dòng)勢(shì)，通過(guò)改變附加電動(dòng)勢(shì)的大小，來(lái)達(dá)到改變轉(zhuǎn)子電流進(jìn)而改變電磁轉(zhuǎn)矩和轉(zhuǎn)速的目的。本文著重對(duì)繞線轉(zhuǎn)子交流異步電動(dòng)機(jī)轉(zhuǎn)差功率回饋型調(diào)速系統(tǒng)即異步電動(dòng)機(jī)串級(jí)調(diào)速系統(tǒng)的工作原理和工作特性進(jìn)行深入分析與研究。 社會(huì)經(jīng)濟(jì)效益分析以造紙行業(yè)為例，造紙業(yè)是我國(guó)基礎(chǔ)