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配電網電力電子變壓器技術綜述

來源：電工電氣發布時間：2021-07-20 11:20 瀏覽次數：1010

配電網電力電子變壓器技術綜述

張在梅，劉艷

(金川集團股份有限公司，甘肅金昌 737100)

摘要：為彌補傳統電力變壓器在智能電網中的不足，基于電力電子技術的電力電子變壓器 (Power Electronic Transformer，PET) 得到人們的大量關注。介紹了目前國內外 PET 相關的主要技術，對 PET 拓撲結構做了對比與分析。經分析討論認為，配電網中 PET 的拓撲結構應當根據實際情況靈活配置，模塊化多電平變流器型三級拓撲結構兼具結構簡單和易于擴展的優點，是值得推廣的一種拓撲結構。三級型電力電子變壓器拓撲結構既可以實現傳輸功率的可控目標，又可以為分布式電源和直流負荷提供方便的接口，是 PET 未來的發展方向。指出多樣化的功能和靈活的控制特性使得電力電子變壓器在未來配電網中的應用具有廣闊的發展空間。

關鍵詞：配電網；電力電子變壓器；拓撲結構；關鍵技術

中圖分類號：TM41 文獻標識碼：A 文章編號：1007-3175(2021)07-0005-07

Review of Power Electronic Transformer Applied in Distribution Network

ZHANG Zai-mei, LIU Yan

（Jinchuan Group Co., Ltd, Jinchang 737100, China）

Abstract: In order to compensate deficiencies of traditional power transformers in smart grids, power electronic transformers (PET) based on power electronic technology have received a lot of attention. In this paper, the main relevant technologies of PET have been introduced,and its topological structures have been compared and analyzed. After the analysis and discussion, it is concluded that PET topological structures of the distribution grid should be equipped flexibly according to the reality. The three-state topology of modular multilevel converter has advantages both of simple structure and great expansion consequently worthy promoting. The three-state topology of power electronic transformer not only manages to control transmission power, but also provides flexible interfaces for distributed generations and DC loads,which conforms to the developing trend of PET. In conclusion, PET will be applied extensively to the distribution grid in the future because

of its various functions and flexible controlling.

Key words: distribution grid; power electronic transformer; topology; key technology

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