【正文】 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。 其中中水提升泵 系統(tǒng) （一控三）， 其變頻柜控制三臺 75KW 水 泵 ，變頻泵 定時(shí)循環(huán)運(yùn)行，一周自動(dòng)切換一次，當(dāng)變頻泵不能滿足要求時(shí)，自動(dòng)軟啟動(dòng)一臺工頻泵 ,當(dāng)變頻泵仍然不能滿足壓力給定 值 時(shí)，再自動(dòng)軟啟動(dòng)第三臺水泵 。 工業(yè)補(bǔ)給水泵系統(tǒng)（一控二），其變頻柜只控制兩臺 37KW 小 泵，水泵不要求定時(shí)循環(huán)運(yùn)行，但能夠手動(dòng)切換運(yùn)行。當(dāng)變頻泵不能滿足要求時(shí)，自動(dòng)啟動(dòng)另一臺工頻小泵。75KW 大泵只能工頻手動(dòng)控制，不參與變頻自動(dòng)控制。 兩套系統(tǒng)的基本構(gòu)成均 由變頻器 （含 PID） 、 軟啟動(dòng)器、電動(dòng)機(jī) 、壓力傳感器等構(gòu)成 ，而且 都 利 用 了 變頻器 來 控制 水泵電機(jī)的軟啟動(dòng)和 轉(zhuǎn) 速 。 壓力 變送 器 用來 檢測 水泵房管網(wǎng)中的 當(dāng)前水壓， 以電信號的方式 送入 變頻器的 PID 控制器 與設(shè)定值 進(jìn)行 比較后 執(zhí)行PID 運(yùn)算， 對 變頻器的輸出 頻率和電壓進(jìn)行控制 ， 從而 改變水泵電機(jī)的轉(zhuǎn)速 進(jìn) 而 改變供水量，最終 使 管網(wǎng) 中的水 壓穩(wěn)定在設(shè)定值 的 附近。 關(guān)鍵詞 ：變 頻 器、軟啟動(dòng)器、 水泵、 PID、調(diào)速 ） II The Design of Frequency Control System of an Integrated Water Pump House of a Power Plant Abstract This paper is based on technical requirements of an integrated water pump house of a power plant. It is intended for water lift pump and industrial water supply pump frequency control two systems transformation. Where the water lift pump system (one control three), its variable frequency counter control three pumps of 75KW, these pumps need timing loop operation, one week automatically switch once. When one pump can not meet the requirements, automatically starts frequency pump, when two pump still can not meet the pressure setpoint, and then a third pump automatic soft starts. Industrial supply pump system (one control two), its variable frequency counter only control two small pumps of 37KW, the two pumps do not require timing loop to run, but the system can be run manually, when one pump can not meet the requirements, 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)的國內(nèi)外發(fā)展與現(xiàn)狀 .............................................................................. 1 國內(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 .......................................................................................................