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  • 今天是2019年3月14日 星期四,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

    安徽精誠銅業

    文字:[大][中][小] 2015-7-14    瀏覽次數:2157    

    UAPF在鋼鐵冶金行業的應用


    安徽精誠銅業

           基本情況介紹

           直流軋機一般采用的都是直流電機,軋鋼時功率因數非常低,一般在0.7左右,它們最大的一個特點就是工作周期較短,速度快,屬于沖擊性負荷,無功波動大。直流軋機由于采用的電氣傳動為晶閘管整流技術,根據整流脈數可以分為6脈整流,12脈甚至24脈,在工作時除了功率因數較低外,同時也產生高次諧波,一般國內直流軋機采用的是六脈動整流技術,所以在整流變壓器單個低壓繞組側產生的諧波主要以5,7,11,13次為主。大量的諧波會影響可控硅設備,精密儀表或加工設備的穩定運行,甚至產生質量事故,普通的電容器組補償,根本無法實時跟蹤負荷變化進行有效的補償,機械觸點因頻繁投切易損,且對電網的沖擊較大。引起電氣設備發熱,振動,增加損耗,縮短壽命,干擾通訊,使可控硅誤觸發,部分繼電保護誤動作,電氣絕緣老化損壞等。    安徽精誠銅業的熱軋機生產線是由容量為2300KVA的整流變壓器帶2臺功率為728KW的直流電機組成,其中每臺直流傳送系統采用200A的有源濾波加容量1290Kvar的無源濾波進行治理。2012年11月12日安徽佑賽科技有限公司技術人員通過在現場對使用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。

         二 測量數據匯總

           通過現場負荷進行測試,采用有源加無源混合型濾波治理前后A、B、C三相電壓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

    A

    B

    C

    電流有效值(A

    1257

    1264

    1216

    926.5

    918.2

    887.4

    THDi(%)

    27.5%

    27.9%

    28.9%

    8.3%

    8.5%

    9.1%

    有功功率(kw

    335.3

    332.3

    324.4

    335.4

    332.4

    324.6

    無功功率(kVar

    342.1

    348.7

    331.0

    110.4

    109.3

    103.1

    視在功率(kVA

    479.0

    481.7

    463.4

    353.1

    349.9

    338.2

    功率因數

    0.70

    0.69

    0.70

    0.95

    0.95

    0.96

         三 治理前后對比

           使用電能質量分析儀(CA8835)對直流傳動系統治理前后進行了測試,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,且電流畸變率以及各次諧波含量大大降低,功率因數得到了提高。UAPF+UTSF的治理方案很好的濾除了負荷中的大部分諧波同時提高了功率因數。

     

          四 治理解決方案

           在設計治理方案前,我公司技術支持工程師前往安徽精誠銅業現場對熱軋機負荷進行了測試和了解,熱軋機生產線是由容量為2300KVA的整流變壓器帶2臺功率為728KW的直流電機組成。

           針對熱軋機整個工作過程中負荷變化快、波動量大、諧波電流大、功率因數低、諧波成分比較固定且主要是5、7、11次諧波的特點。再考慮用戶經濟成本的基礎上選用一套200A的有源濾波器加1290Kvar無源濾波的混合型治理方案來消除負荷中的大部分諧波同時滿足功率因數的要求 。

          五 其它典型案例

            關于UAPF在鋼鐵冶金行業的應用,同類案例包括:長江鋼鐵、馬鞍山鋼鐵等。

     

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