A New Control Method for Suppression of the DC Magnetic Flux Induced in Series Transformers Used for a Dynamic Voltage Restorer

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  • Jimichi Takushi
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Fujita Hideaki
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology
  • Akagi Hirofumi
    Dept. of Electrical and Electronic Engineering, Tokyo Institute of Technology

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  • 直列補償型瞬時電圧低下補償装置に使用する直列変圧器の直流磁束抑制法
  • チョクレツ ホショウガタ シュンジ デンアツ テイカ ホショウ ソウチ ニ シヨウスル チョクレツ ヘンアツキ ノ チョクリュウ ジソク ヨクセイホウ

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Abstract

This paper proposes a new suppression method of magnetic-flux deviation in series transformers used in a dynamic voltage restorer. A dc flux as well as an ac flux appears in the series transformers at the beginning of voltage-sag compensation. Since an amount of dc flux depends on a phase angle of the source voltage at the beginning of compensation, the sum of an ac flux and a dc flux may reach twice the rated flux. Therefore, the cross section of a series-transformer core should be designed twice as large as that of a generally-designed transformer, in order to avoid flux saturation. The proposed method to eliminate dc flux from the series transformer makes the compensating voltage zero for a short duration. As a result, only an ac flux appears in the series transformer, thus allowing us to use a generally-designed transformer. Experimental results obtained from a 200-V, 5-kW laboratory system are shown to verify the viability of the proposed method.

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