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                                                                                                                                                                                                                                                                                                                                UPS電源配置蓄電池的計算公式

                                                                                                                                                                                                                                                                                                                                2018-02-05   |  來源:煒業通科技

                                                                                                                                                                                                                                                                                                                                電池計算通常有兩種方法

                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                1恒電流模式計算:

                                                                                                                                                                                                                                                                                                                                  根據能量守恒原理,電池的配置按如下公式計算:

                                                                                                                                                                                                                                                                                                                                  C=(PL×T)/(Vbat×η×K)

                                                                                                                                                                                                                                                                                                                                  其中:C--蓄電池容量,(Ah)PL―UPS輸出功率(W);T―電池后備時間(h);

                                                                                                                                                                                                                                                                                                                                  Vbat―電池組電壓(Vdc),η―UPS電池逆變效率(0.90-0.95,根據機型選?。?。

                                                                                                                                                                                                                                                                                                                                  K―電池放電效率(系數)。

                                                                                                                                                                                                                                                                                                                                  K的選取按照下表:

                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                K

                                                                                                                                                                                                                                                                                                                                放電時間<1h

                                                                                                                                                                                                                                                                                                                                1h

                                                                                                                                                                                                                                                                                                                                2h

                                                                                                                                                                                                                                                                                                                                4h

                                                                                                                                                                                                                                                                                                                                >8h

                                                                                                                                                                                                                                                                                                                                電池放電效率

                                                                                                                                                                                                                                                                                                                                0.6

                                                                                                                                                                                                                                                                                                                                0.7

                                                                                                                                                                                                                                                                                                                                0.8

                                                                                                                                                                                                                                                                                                                                0.9

                                                                                                                                                                                                                                                                                                                                1

                                                                                                                                                                                                                                                                                                                                  根據計算結果,確定電池的Ah數,分別根據不同品牌電池選取合適的配置。

                                                                                                                                                                                                                                                                                                                                  例如:某品牌新一代機架式高性能小容量UPS-ITA系列6kVA,電池組電壓192V(16節12V的電源串聯),UPS電池逆變效率0.94,按滿載4.8kW,后備2小時計算

                                                                                                                                                                                                                                                                                                                                  C=4800*2/(192*0.94*0.7)=76Ah(估算值)選取12V85Ah的電池16節即可,例如C&D12-76LBT。

                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                2恒功率計算公式

                                                                                                                                                                                                                                                                                                                                  W=PL÷(N*6*η)(Watts/cell)

                                                                                                                                                                                                                                                                                                                                  其中,PL為UPS額定輸出的有功功率(kW);N為12V的電池數量;Vf為電池組額定電壓,η為逆變器效率。

                                                                                                                                                                                                                                                                                                                                  即先計算出單體電池所需功率,再通過電池廠家提供的恒功率放電表查找可滿足要求的電池型號。

                                                                                                                                                                                                                                                                                                                                  終止放電電壓按照1.75V/cell確定。通常電池廠家給出的功率表為單體2V/Cell的功率,定義為Watts/cell。

                                                                                                                                                                                                                                                                                                                                  部分廠家給出的功率表為Watts/block,則需要再乘6這個系數。

                                                                                                                                                                                                                                                                                                                                  例如:某品牌新一代機架式高性能小容量UPS-ITA系列20kVA,電池節數32節(30-40節偶數節可調),UPS電池逆變效率0.95,按滿載    20kVA*0.9=18kW,后備2小時計算.

                                                                                                                                                                                                                                                                                                                                  W/cell=PL/(N×6×η)=18000/(32*6*0.95)=98.68Watts/cell

                                                                                                                                                                                                                                                                                                                                 

                                                                                                                                                                                                                                                                                                                                  C&D的MPS系列12-76的放電功率表如圖:2小時放電功率在1.75Vdc時為51.5W/cell,選取98.68/51.5=1.92組,取2組32節12V76Ah的C&D MPS系列電池,共64節。

                                                                                                                                                                                                                                                                                                                                (來源:UPS應用)

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