AS-P930-007
AS-P930-007
AS-P930-007
有源電力濾波器從拓撲結構上分為串聯(lián)型有源電力濾波器、并聯(lián)型有源電力濾波器和混合型有源電力濾波器。目前市場上的有源電力濾波器幾乎都屬于并聯(lián)型，并聯(lián)型有源電力濾波器主要原理是通過互感器采集被補償負載的電流，通過計算分析提取出負載電流的諧波成分，有源電力濾波器被動輸出反向的諧波電流來抵消系統(tǒng)中的諧波電流，達到諧波補償目的。
如圖2所示，1#主變和2#主變共用一段10KV母線，1#主變下UPS1沒有投入運行，主要負載全是線性負載，2#主變下UPS2投入運行，主要負載全是非線性負載，聯(lián)絡柜中聯(lián)絡開關始終處于斷開狀態(tài)。單獨運行1#主變時，測量點M1處沒有諧波電流和諧波電壓；單獨運行2#主變時，測量點M2處有諧波電流和諧波電壓，開啟APF2補償后，測量點M2處諧波電壓和諧波電流有效值減小；同時運行1#主變和2#主變時，測量點M1和M2處都有諧波電流和諧波電壓存在，單獨開啟APF1，測量點M1和M2處諧波電流和諧波電壓有效值沒有變化，單獨開啟APF2，測量點M1和M2處諧波電流和諧波電壓有效值同時減小。
上述測試中有一種情況比較特殊，在同時運行1#主變和2#主變，單獨開啟APF1進行補償時，雖然濾波器有諧波電流輸出，但是測試點M1和M2處諧波電流和諧波電壓有效值并沒有減小，測量1#主變下線性負載上的電流諧波有效值，有明顯的放大現(xiàn)象。這說明2#主變下非線性負載引起諧波電流失真，導致10KV段電壓失真，失真的電壓加在1#主變的線性負載兩端，使M1點出現(xiàn)了諧波電流和諧波電壓。雖然APF1對線性負載的諧波電流進行了補償，但M1點的諧波電流和諧波電壓不會改變，相對于APF1并線點的網側諧波電流和諧波電壓有效值不變，負載側諧波電流有效值增大。因此，并聯(lián)型有源電力濾波器并不能有效濾除電壓諧波引起的電流諧波，相反，會使負載側諧波電流變的更大。
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