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電流不同,有源電力濾波器有什么作用?

發表時間:2021-02-22 17:22【 閱讀量:-查看手機網址
掃一掃!電流不同,有源電力濾波器有什么作用?掃一掃!

  有源電力濾波器一般由指令電流檢測電路和補償電流發生電路組成。指令回電流檢測電路答的功能主要是從負載電流中分離出諧波電流分量和基波無功電流,然后將其反極性作用后發生補償電流的指令信號。電流跟蹤控制電路的功能是根據主電路產生的補償電流,計算出主電路各開關器件的觸發脈沖,此脈沖經驅動電路后作用于主電路。這樣電源電流中只含有基波的有功分量,從而達到消除諧波與進行無功補償的目的。有源電力濾波器的主電路一般由PWM逆變器構成。根據逆變器直流側儲能元件的不同,可分為電壓型有源濾波器(儲能元件為電容)和電流型有源濾波器(儲能元件為電感)。電壓型有源濾波器在工作時需對直流側電容電壓控制,使直流側電壓維持不變,因而逆變器交流側輸出為PWM電壓波。而電流型有源濾波器在工作時需對直流側電感電流進行控制,使直流側電流維持不變,因而逆變器交流側輸出為PWM電流波。

此文關鍵字:有源電力濾波器作用

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