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　廣州地鐵三號線集中冷站系統構成及特點
　　廣州地鐵三號線集中冷站采用了施耐德高端PL C QUANTUM 控制器系列，對集中冷站和車站進行控制，各車站與集中冷站之間采用多模光纖以太網通訊方式，通訊協議為MODBUS TCP .大大保證了通訊速率和通訊信息量的要求，同時也保證了通訊距離和系統的安全可靠性。送排風及空調系統采用變頻器調節風量，水系統二次泵也均采用變頻器調節。變頻器與通過Modbus通訊接口接入就地遠程I/O箱的遠程通訊模塊上，大大減少了通訊線的距離，避免了干擾。
　　● 集中冷站系統構成
　　○ 集中冷站供冷系統由集中冷站，傳輸管道和末端設備構成
　　○ 其中供冷系統圖如圖1-1，冷站系統圖如圖1-2
集中冷站系統特點
　　與分站供冷方式相比，集中冷站供冷系統需要為多個車站供冷，在供冷范圍和數量上都要大得多，有以下幾個主要特點：
　　● 冷凍水傳輸距離長。一般地鐵站距在1000米左右，本系統為6個車站供冷，冷凍水傳輸距離將達 2000～3000米。長距離傳輸，管路的阻力大為增加，并且系統的熱惰性加大，增大了系統的調節難度
　　● 末端設備數量多，供冷管路形成網絡。由于各站的負荷情況不同，系統調節時易導致出現相互影響，需考慮整個網絡的整體水力平衡
　　● 集中冷站供冷系統的制冷部分，通常采用多機組，二級泵的形式。這種形式適應了長距離管路輸送阻力較大的情況，能夠減小末端系統對冷機的影響。但是增加了泵的數量和管路復雜性，使調節控制的難度加大
　　調節控制方法與策略
　　調節控制手段
　　● 廣州地鐵三號線集中供冷系統中，PLC采用的調節控制手段有：
　　○ 風機變頻變風量(末端設備)
　　○ 水泵變頻變水量
　○ 水閥調水量
　　○ 質調節
　　調控手段的選擇
　　由于管路很長，冷凍水從集中冷站到末端設備需要運行數十分鐘，如果采用質調節，則調節時滯太大。因此在實時控制中，主要采用量調節的方式(包括風量調節和水量調節)。質調節則采用開環方式，根據外溫或季節確定冷凍水溫，并在一定時間內(比如1天內)保持相對穩定。
　　二級泵管路長，阻力大，且流量直接受末端負荷的影響，因此二級泵采用變頻調節，可以達到較好的節能效果。同時為了保證通過冷水機組的水量，一級泵采用定速泵，并與冷機對應運行，不進行變頻調節。
　　從節能的角度考慮，優先考慮節能效果較好的風機變頻和水泵變頻調節，盡量少使用水閥調水量的方法。
　　控制調節的策略
　　初調節
　　集中冷站供冷的管路復雜，不同支路之間的阻力差距大，因此需要進行認真的系統初調節，以免系統水力失調，導致運行調節無法正常進行。
　　● 初調節目標：
　　○ 驗證系統可以達到設計工況
　　○ 實現系統的水力平衡，為運行調節準備條件。
　　● 調節步驟
　　經多次調整，使系統內各機組的流量基本相同(如機組型號不同，則各機組的流量比值應基本相同。流量比值=實際流量/設計流量)。且至少1個機組的閥門為全開狀態。
　　1、調整一級泵系統水力平衡
　　2、設計頻率整定

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