描述

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300MW及以上容量機(jī)組的熱工控制已全面采用DCS控制系統(tǒng)，逐步形成了數(shù)據(jù)采集(DAS)、模擬量控制(MCS)、順序控制(SCS)、燃燒器管理(BMS)四大系統(tǒng)。從實(shí)際運(yùn)行情況來(lái)看，DCS較好地實(shí)現(xiàn)了其控制功能，并發(fā)揮了安全經(jīng)濟(jì)、使用可靠的優(yōu)點(diǎn)，取得了良好的效果，而電氣控制仍然采用較常規(guī)的控制手段，使用盤(pán)臺(tái)上一對(duì)一硬手操方式。隨著計(jì)算機(jī)的快速發(fā)展和控制技術(shù)的不斷提高，使得機(jī)爐控制與電氣控制日益顯得不協(xié)調(diào)，控制水平也逐漸拉大。為了解決這一矛盾，有效的辦法就是將電氣納入DCS控制之中，這樣既利用DCS已成熟的分散控制技術(shù)，又能提高電氣控制水平。電氣控制納入DCS以后，可充分利用DCS的手段，使電氣防誤操作等功能實(shí)現(xiàn)更方便、更完備，并且將相關(guān)量的顯示報(bào)警與電氣設(shè)備的控制調(diào)節(jié)有機(jī)地結(jié)合起來(lái)，有效提高整個(gè)電氣控制的安全性和可靠性。
1997年7月原電力部召開(kāi)了熱工自動(dòng)化領(lǐng)導(dǎo)小組第六次擴(kuò)大會(huì)，對(duì)電氣設(shè)計(jì)如何與DCS配合提出了具體意見(jiàn)：“實(shí)現(xiàn)爐、機(jī)、電集中管理，使電廠主控室爐、機(jī)、電控制水平協(xié)調(diào)發(fā)展是必要的而且在現(xiàn)有技術(shù)和裝備條件下是可行的，可以起到省人、省主控制室面積，便于集控值班運(yùn)行的作用，而且不提高造價(jià)。領(lǐng)導(dǎo)小組要求以積極的態(tài)度加入電氣納入DCS的工程試點(diǎn)。”按此精神，九江電廠三期2×350MW、信陽(yáng)電廠一期2×300MW、益陽(yáng)電廠一期2×300MW工程電氣系統(tǒng)均納入DCS監(jiān)控。現(xiàn)依據(jù)這幾個(gè)工程中具體實(shí)施的過(guò)程和要求，就電氣系統(tǒng)納入DCS監(jiān)控的一些有關(guān)問(wèn)題進(jìn)行分析和探討。電氣系統(tǒng)與熱工自動(dòng)化相比在控制要求及運(yùn)行過(guò)程中有著很多不同點(diǎn)，電氣的主要特點(diǎn)表現(xiàn)為：
（1）電氣設(shè)備相對(duì)熱工設(shè)備而言控制對(duì)象少，操作頻率低，有的系統(tǒng)或設(shè)備運(yùn)行正常時(shí)，時(shí)常幾個(gè)月或更長(zhǎng)時(shí)間才操作一次。

（2）電氣設(shè)備保護(hù)自動(dòng)裝置要求可靠性高，動(dòng)作速度快。發(fā)變組保護(hù)動(dòng)作速度要求在40ms以內(nèi)；自動(dòng)準(zhǔn)同期采用同步電壓方式，轉(zhuǎn)速、電壓調(diào)整和滑壓控制要求在5ms以內(nèi)；電壓自動(dòng)調(diào)整裝置快速勵(lì)磁要求時(shí)間極短；廠用電快切裝置快速切換時(shí)間一般小于60～80ms，同步鑒定相位差5°～20°。
（3）300MW及以上機(jī)組一般每2臺(tái)機(jī)組共用1臺(tái)起／備變，任一機(jī)組檢修都不能影響另1臺(tái)機(jī)組的正常運(yùn)行，因此DCS控制應(yīng)考慮其控制方式，確保只能有1臺(tái)機(jī)組的DCS實(shí)現(xiàn)對(duì)共用部分的控制，同時(shí)另一機(jī)組DCS能夠?qū)崿F(xiàn)實(shí)時(shí)監(jiān)視，并且這種操作控制權(quán)能實(shí)現(xiàn)切換。
（4）電氣設(shè)備電氣系統(tǒng)的聯(lián)鎖邏輯較簡(jiǎn)單，但電氣設(shè)備本身操作機(jī)構(gòu)復(fù)雜。
因此，機(jī)組的電氣系統(tǒng)納入DCS控制，要求控制系統(tǒng)具有很高的可靠性。除了能實(shí)現(xiàn)正常起停和運(yùn)行操作外，尤其要求能夠?qū)崿F(xiàn)實(shí)時(shí)顯示異常運(yùn)行和事故狀態(tài)下的各種數(shù)據(jù)和狀態(tài)，并提供相應(yīng)的操作指導(dǎo)和應(yīng)急處理措施，保證電氣系統(tǒng)自動(dòng)控制在最安全合理的工況下工作。

產(chǎn)品承諾：
保?證?全新原裝進(jìn)口,
保?證?安全準(zhǔn)時(shí)發(fā)貨，
保?證售后服務(wù)質(zhì)量，
優(yōu)勢(shì)價(jià)格，大量現(xiàn)貨。

主營(yíng)DCS系統(tǒng)配件
機(jī)器人系統(tǒng)配件
大型伺服系統(tǒng)配件
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