在采用調節閥控制液位時，這種來油量的干擾會導致原油緩沖罐的液位有較大的波動，也就是說液位控制回路的余差變大，遠遠超出了工藝要求的范圍。在此種情況下，雖然可以通過增大比例作用來克服這種不利情況，但增大比例作用的副作用會使控制回路的穩定性變差，嚴重時發生等幅振蕩甚至發散振蕩的情形。采用變頻器后，可根據系統的運行情況，適當改變變頻器的〔加速/減速時間設定〕選項，當加速/減速時間設定得較小時，受控變量（液位信號）有一個小變化，變頻器的輸出信號就有較大的響應。反之，當加速/減速時間設定的較大時，變頻器的輸出信號響應會比較緩慢。
　　根據上位機從下位機上得到的實時液位曲線，利用經驗法很快就可以完成控制回路IPD參數的調整。采用變頻器和提升泵的組合來代替調節閥來控制緩沖罐的液位后，系統抗干擾能力得到加強，魯棒性也得到進一步提高，徹底**了因來油的擾動而造成的液位大幅波動現象，控制回路的各項性能指標一**偏差、回復時間和余差都得到了較大提高。
　　改造后的控制回路取消了氣動薄膜調節閥，節省了氣動薄膜調節閥的投入費用；由于變頻器的引入，提升泵的運行狀況得到了較大的改觀，檢修周期也大大地延長，節約了提升泵的維修費用；而且采用變頻器后，提升泵會根據緩沖罐液位的變化情況來變頻運行，節約了大量的電費，取得了可觀的經濟效益。從系統改造至今，系統一直正常運行。實踐證明這次改造是成功的，隨著變頻器性能的不斷發展和完善，變頻器的應用也越來越廣泛。聯合站液位控制系統的改造是諸多成功應用實例中的一例，希望這項工作能對國內同行有一些啟示和幫助，為推進變頻器的應用起到一定的作用。

漳州鼎晟達自動化設備有限公司是一家多年專業從事大型進口系統（集散式控制系統、可編程控制器、冗余容錯控制系統、機器人系統）備件銷售。長年與歐美，北美等全球知名工業廠商建立起穩定的合作關系，產品直接國外進口，省掉中間環節，為廣大企業用戶節約開支！目前公司業務遍布全國各省市，經過多年的服務，總結出專為系統用戶服務的成熟模式，實現服務的人性化、流程的簡單化以及管理的規范化，**幫助客戶延長電氣設備的使用周期，降低運營成本，控制停產風險、提高生產效率！主營國際知名品牌工控系統備件：AB SLC500,PL5，ABB機器人，GE，FOXBORO I/A，TIRCONEX，瑞恩，西屋OVATITONT，西門子,MOORE，MODICON,KUKA機器人，安川機器人，貝利，貝加萊，博世傳動，HONEYWELL。
長期以來，公司堅守“重視合同 , 確保質量 : 準時交付 , 嚴守承諾” 經營理念；以極大的熱情致力于創造和實現富**力的企業管理模式；運用先進的計算機管理系統，建有完善的信息化管理平臺，為采購、管理、銷售、服務等各個業務環節的信息化服務，大大增強了企業核心競爭力。
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資訊來源：漳州鼎晟達自動化設備有限公司