隨著工廠中變頻器設備等大功率開關器件的廣泛應用,電能質量問題日益突出。三次諧波對電網的危害日漸嚴重,諧波治理已不容忽視。進行諧波治理,提高電力品質是第一位的,其次是節能。諧波治理是個綜合治理的過程,一方面是從源頭抓起,加強設備的管理防止諧波的產生,更重要的一方面是提高認識,積極進行諧波治理,防止災害產生。下面就給大家分享一個真實的諧波治理案例。
某石化公司煉油廠電(dian)氣車間(jian)加氫(qing)裂化變電(dian)所(suo)(suo)低壓(ya)配電(dian)系統運行不(bu)夠問題,時有電(dian)纜絕緣擊穿、配電(dian)元件易損壞,接觸器聲(sheng)音過(guo)大等(deng)現象(xiang)發(fa)生。而其(qi)他類似的變電(dian)所(suo)(suo)現象(xiang)并不(bu)明顯。
為此立項立項進行電氣隱患治理。該所低壓配電系統共有兩段母線,各由一臺容量為1600kVA的變壓器供電,各段的主要負荷均為3臺75kW變頻器,5臺22kW變頻器以及其他一些小型電機。通過改變交流電頻率的方式實現交流電控制的技術就叫變頻技術,變頻技術中的相控整流和不可控二極管整流使輸入電流波行發生嚴重畸變,降低了系統的功率因數,還會引起了嚴重的諧波污染。該所低壓系統就是受到了嚴重的諧波污染。
諧波的抑制
有(you)(you)源濾(lv)波(bo)裝置(zhi)可實時檢測電(dian)(dian)網中非線(xian)性(xing)負載產(chan)生(sheng)的電(dian)(dian)流波(bo)行(xing),分離出(chu)諧波(bo)部分,將其反相(xiang),再(zai)通過IGBT逆變器的出(chu)發將反相(xiang)電(dian)(dian)流注(zhu)入電(dian)(dian)網中,實現(xian)濾(lv)除諧波(bo)的功能。有(you)(you)源濾(lv)波(bo)裝置(zhi)可集動(dong)態(tai)濾(lv)波(bo)、動(dong)態(tai)電(dian)(dian)流補償(chang)以及動(dong)態(tai)無功功率(lv)補償(chang)(容性(xing)、感性(xing)可編程)于一體(ti)(ti),性(xing)能優異(yi),具有(you)(you)響(xiang)應速度快、濾(lv)除效率(lv)高、不(bu)與(yu)系統產(chan)生(sheng)諧振(zhen)和體(ti)(ti)積小等優點(dian)。
這里強烈向大家推薦一款工業型有源濾波器,專為工業(ye)現(xian)(xian)場(chang)濾除諧波而打造,適(shi)應(ying)各種(zhong)惡劣的現(xian)(xian)場(chang)環境。抗高電(dian)壓(ya)畸變,耐沖擊、抗干(gan)擾。
工(gong)(gong)業(ye)有(you)源濾波器(qi)裝置(zhi)(APF)設(she)計(ji)目標(biao): ? 高電(dian)(dian)(dian)(dian)壓(ya)(ya)畸(ji)變率(lv)下(xia)正常運行; ? 注(zhu)重防塵(chen)、散(san)(san)熱; ? 耐(nai)沖(chong)擊(ji)、抗干擾性(xing)強、滿載輸出; 采(cai)取如(ru)下(xia)方案(an): ? LCL采(cai)取大(da)容(rong)(rong)量阻尼(ni)電(dian)(dian)(dian)(dian)阻及電(dian)(dian)(dian)(dian)容(rong)(rong),結合(he)有(you)源阻尼(ni),可(ke)在高次電(dian)(dian)(dian)(dian)壓(ya)(ya)畸(ji)變下(xia),穩定工(gong)(gong)作; ? 器(qi)件余(yu)(yu)量大(da),峰值(zhi)系(xi)(xi)數4倍,保證滿載運行; ? 離心(xin)大(da)容(rong)(rong)量風(feng)(feng)機(ji)散(san)(san)熱,除散(san)(san)熱器(qi)及電(dian)(dian)(dian)(dian)感外,其(qi)余(yu)(yu)均不在風(feng)(feng)道內(nei),絕緣散(san)(san)熱好(hao); ? 立(li)式結構設(she)計(ji),底部(bu)進風(feng)(feng),頂部(bu)出風(feng)(feng),前、后門下(xia)部(bu)開進風(feng)(feng)空,加防塵(chen)百葉窗,防塵(chen)效果(guo)好(hao); ? 保證出力的情(qing)況(kuang)下(xia),設(she)計(ji)較大(da)的電(dian)(dian)(dian)(dian)感,可(ke)在電(dian)(dian)(dian)(dian)網電(dian)(dian)(dian)(dian)壓(ya)(ya)突(tu)變或沖(chong)擊(ji)下(xia)穩定運行; ? 傳統施(shi)耐(nai)德進線接(jie)觸器(qi),比板(ban)載繼電(dian)(dian)(dian)(dian)器(qi)更耐(nai)沖(chong)擊(ji),可(ke)通過更大(da)沖(chong)擊(ji)電(dian)(dian)(dian)(dian)流(liu)。 使用場合(he): ? 工(gong)(gong)作電(dian)(dian)(dian)(dian)壓(ya)(ya)從208V-750V,安裝設(she)計(ji)方式靈(ling)活多樣; ? 主要應用于(yu)非線性(xing)負(fu)荷、大(da)型交(jiao)直(zhi)流(liu)電(dian)(dian)(dian)(dian)機(ji)、整流(liu)設(she)備、急劇變化負(fu)荷等(deng)環境。如(ru):軋機(ji)、電(dian)(dian)(dian)(dian)弧(hu)爐(lu)、中頻爐(lu)、密煉(lian)機(ji)、礦山提升機(ji)、電(dian)(dian)(dian)(dian)力機(ji)車供電(dian)(dian)(dian)(dian)系(xi)(xi)統。