WOODWARD 5462-718
WOODWARD 5462-718
WOODWARD 5462-718
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2.發展趨勢
變頻器技術的發展趨勢經歷大約三十年的研發與應用實踐，隨著新型電力電子器件和微處理器的應用以及控制技術的發展，變頻器的性能價格比越來越高，體積越來越小，而廠家仍然在不斷地提高可靠性實現變頻器的進一步小型輕量化、化和多功能化以及無公害化而做著新的努力。變頻器性能的優劣，一要看其輸出交流電壓的諧波對電機的影響，二要看對電網的諧波污染和輸入功率因數，三要看本身的能量損耗（即效率），這此以交—直—交變頻器為例，從技術上看在以下幾個方面會進一步得到發展：
1．主電路功率開關元件的自關斷化、模塊化、集成化、智能化，開關頻率不斷提高，開關損耗進一步降低。
2．變頻器主電路的拓撲結構方面：變頻器的網側變流器對低壓小容量的常採用6脈衝變流器，而對中壓大容量的採用多重化12脈衝以上的變流器。負載側變流器對低壓小容量的常採用兩電平的橋式逆變器，而對中壓大容量的採用多電平逆變器。
3．脈寬調制變壓變頻器的控制方法：正弦波脈寬調制（SPWM）控制。指定次數諧波的PWM控制。電流跟蹤控制。電壓空間矢量控制（磁鏈跟蹤控制）。
4．交流電動機變頻調整控制方法的進展：由標量控制（V／f控制和轉差頻率控制）向高動態性能的矢量控制和直接轉矩控制發展。開發無速度傳感器的矢量控制和直接轉矩控制係統。
進入21世紀，電力電子的基片已從Si（硅）變換為SiC（碳化硅），使電力電子新器件進入到高電壓大容量化、高頻化、組件模塊化、微小型化、智能化和低成本化的時代，多種適宜變頻調速的新型電氣設備正在開發研制之中。IT技術的迅猛發展，以及控制理論的不斷創新，這些與變頻器相關的技術將影響其發展的趨勢。
交流變頻調速技術是強弱電混合、機電一體的綜合性技術，既要處理巨大電能的轉換（整流、逆變），又要處理信息的收集、變換和傳輸，因此它的共性技術必定分成功率和控制兩大部分。前者要解決與高壓大電流有關的技術問題和新型電力電子器件的應用技術問題，後者要解決（基於現代控制理論的控制策略和智能控制策略）的硬、軟件開發問題（在目前狀況下主要全數字控制技術）。
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