【正文】 ements, automatically starts another small pump. 75KW large pump only manual control by power frequency and it does not participate in frequency control. The basic structure of the two systems by the frequency inverter (including PID), soft starter, motor, pressure sensors, etc. and both two systems have taken advantage of the inverter to control the pump motor soft start and speed. Pressure transmitter used to detect current pipe pressure of pump, in the form of electrical signals sented into the PID controller of inverter and pared with the set value , after that the PID operation is performed, which is to control the inverter output frequency and voltage, thus changing the pump motor speed and then change the water supply, and finally making the pipe work water pressure stabilized at the setpoint nearby. Keywords: frequency inverter, soft starter, water pump, PID, speed control ） III 目錄 摘要 ..............................................................................................................................................I Abstract........................................................................................................................................ II 第一章 引言 ................................................................................................................................. 1 研究背景 ........................................................................................................................ 1 變頻技術(shù)的國(guó)內(nèi)外發(fā)展與現(xiàn)狀 .............................................................................. 1 國(guó)內(nèi)外水泵變頻系統(tǒng)的現(xiàn)狀 .................................................................................. 1 本設(shè)計(jì)研究的主要內(nèi)容 ................................................................................................... 2 第二章 水泵變頻調(diào)速控制系統(tǒng)總體設(shè)計(jì)方案 ................................................................................ 5 變頻調(diào)速控制系統(tǒng) 的理論基礎(chǔ) .......................................................................................... 5 三相異步電動(dòng)機(jī)的調(diào)速原理 .................................................................................. 5 軟啟動(dòng)器及其使用 ................................................................................................. 6 水泵變頻調(diào)速控制系統(tǒng)的分析說明 ................................................................................... 9 水泵變頻調(diào)速恒壓供水系統(tǒng)構(gòu)成 ......................................................................... 10 水泵變頻調(diào)速恒壓供水系統(tǒng) 的控制策略 ............................................................... 10 兩系統(tǒng)的 主電路接線圖 .........................................................................................11 軟啟動(dòng)器控制系統(tǒng)的過程分析 ............................................................................. 13 第三章 系統(tǒng)硬件的設(shè)計(jì) ............................................................................................................. 17 變頻控制柜的組成 ......................................................................................................... 17 變頻器 .......................................................................................................................... 18 變 頻器的構(gòu)成 ...................................................................................................... 18 變頻器的主電路 .................................................................................................. 18 變頻器的控制電路 ............................................................................................... 19 變頻器的特點(diǎn)與比較 ........................................................................................... 21 變頻器的選型 ...................................................................................................... 22 變頻器的外部運(yùn)行操作 ........................................................................................ 23 ） IV PID 調(diào)節(jié)器 ................................................................................................................... 24 軟啟動(dòng)器的選擇 ............................................................................................................. 25 壓力變送器的選擇 ......................................................................................................... 26 其它電氣元件 ................................................................................................................ 27 第四章 MM430 系列變頻器的快速調(diào)試 ...................................................................................... 32 參數(shù)復(fù)位 ....................................................................................................................... 32 快速調(diào)試 ....................................................................................................................... 33 功能調(diào)試 ....................................................................................................................... 34 總結(jié) ........................................................................................................................................... 35 參考文獻(xiàn) .................................................................................................................................... 36 附錄 A ........................................................................................................................................ 37 致謝 ........................................................................................................................................... 41 ） 1 第一章 引言 研究背景 變頻技術(shù)的國(guó)內(nèi)外發(fā)展與現(xiàn)狀 近年來電力電子器件的材料開發(fā)和制造工藝水平不斷提高，尤其是高壓大容量絕緣柵雙極型晶體管 IGBT、集成門極換向晶閘管 IGCT 器件的成功開發(fā)，與此同時(shí) 伴隨著微型 計(jì)算機(jī)控制技術(shù)及電 機(jī)拖動(dòng)控制 系統(tǒng) 理論 的發(fā)展 ，使大功率變頻技術(shù)得以迅 速發(fā)展，性能日臻 完善。當(dāng)變頻泵不能滿足要求時(shí)，自動(dòng)啟動(dòng)另一臺(tái)工頻小泵。 本科生畢業(yè)設(shè)計(jì) 說明書 （ 畢業(yè) 論文） 題 目： 電廠綜合水泵房水泵變頻調(diào)速控制系統(tǒng)設(shè)計(jì) ） I 電廠綜合水泵房水泵變頻調(diào)速控制系統(tǒng)設(shè)計(jì) 摘要 本論文 是 根據(jù) 某電廠綜合水泵房工藝 要求， 現(xiàn)擬對(duì)中水提升泵和工業(yè)補(bǔ)給水泵兩套系統(tǒng)進(jìn)行變頻調(diào)速改造。75KW 大泵只能工頻手動(dòng)控制，不參與變頻自動(dòng)控制。如今 我國(guó) 每年大約 60%的 發(fā)電量是 由 電動(dòng)機(jī)消耗掉的，因此如何利用電機(jī)調(diào)速技術(shù)進(jìn)行電機(jī)運(yùn)行方式的改造以節(jié)約電能，受到 了 國(guó)家和業(yè)界人