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  • 今天是2019年3月8日 星期五,歡迎光臨本站 安徽佑賽科技股份有限公司 網址: www.ls0834t.com

    諧波治理

    西安動車

    文字:[大][中][小] 2015-7-14    瀏覽次數:2608    

    UAPF在軌道交通行業的應用

     

    西安動車

     基本情況介紹

    軌道交通系統中較多的為非線性負荷,主要諧波源有:a、電動機車所需要的牽引負荷;b、車站、區間、車輛段、控制中心等其它建筑物所需要的動力用電。諸如:通風機、空調、自動扶梯、電梯、水泵、照明、AFC系統、FAS、BAS、通信系統、信號系統等。由于牽引負荷安裝在35KV側,一般采用12脈動的整流裝置,諧波含量會降低;如果諧波含量不超標,可考慮只在低壓0.4KV側治理第二大用電群產生的諧波。

    西安和諧型大功率機車檢修段主要進行機車的2年檢,預留6年檢條件,檢修規模按照滿足配屬1400臺和諧型機車所產生的檢修量設置。主要負載含有UPS、變頻器、變頻空調、熒光燈、變頻風機等非線性負載,因此在設計之初已經考慮到使用有源電力濾波器進行改善電能的質量。其中某臺變壓器下使用了一套200A的有源電力濾波器進諧波治理。安徽佑賽科技有限公司技術人員通過在現場對使用有源電力濾波器治理前后的測量,并對測試數據進行分析,治理起到了較好的效果。

     

     測量數據匯總

    通過在現場對負荷進行測試,西安和諧型大功率機車檢修段在使用有源電力濾波器進行諧波治理前后A、B、C三相電電流測量結果整體情況匯總如下如表2-1所示。

    表二-1 補償前后測量數據匯總

    測量

    治理前

    治理后

    A

    B

    C

    N

    A

    B

    C

    N

    電流有效值(A

    583.6

    547.3

    525.8

    60.4A

    526.3A

    536.5A

    525.8A

    11.4

    THDi(%)

    30.6%

    32.3%

    35.4%


    4.3%

    4.7%

    4.4%


    3次諧波電流畸變率

    12.0%

    12.3%

    13.6%


    1.7%

    1.9%

    1.7%


    5次諧波電流畸變率

    18.9%

    19.2%

    19.7%


    2.9%

    3.1%

    2.9%


    7次諧波電流畸變率

    8.6%

    8.9%

    9.3%


    1.3%

    1.4%

    1.3%


     

     治理前后對比

    使用電能質量分析儀(CA8835)對變壓器總進線柜進行了測試,由圖中可以直觀的看出,補償后系統電流有效值得到了降低,且電流畸變率、零線電流以及各次諧波含量大大降低,UAPF的輸出電流成分與負荷電流的諧波成分基本相同,很好的實現了濾波功能。

     

        

                           3-1  治理前電流有效值                 圖3-2 治理前電流畸變率  

     

                               

                         圖3-3   治理后電流有效值                 圖3-4  治理后電流畸變率

      治理解決方案

    西安和諧型大功率機車檢修段是新建設的項目,根據設計院設計的變壓器所帶負荷可知,此變壓器下主要負荷是熒光燈、變頻風機以及變頻空調等,系統以3、5、7次諧波為主,其中3次諧波電流利用零線形成回路,以零線電流的形式表現出來。我公司電氣工程師根據此變壓器下負載的畸變率范圍以及諧波估算軟件計算出變壓器下需選用200A的有源電力濾波器,同時變壓器下帶有較多的單相負荷建議選用四橋臂的APF ,對應型號為UAPF-L4200-0.4

     其它典型案例

    關于UAPF在軌道交通行業的應用,同類案例包括:武漢地鐵、合肥樞紐南環線合肥南站及相關工程等。

     

     

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