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(현대자동차) (한양대) (현대자동차) (한양대) (한양대) (한양대) (LS ELECTRIC) (LS ELECTRIC) (LS ELECTRIC)
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전력전자학회 전력전자학회논문지 전력전자학회 논문지 제27권 제4호
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    초록·키워드

    This study proposes a voltage control scheme in a synchronous reference frame to improve the dynamic characteristics of double-conversion UPSs. UPSs need to control positive and negative sequence voltage, so that positive and negative sequence extractors are generally used to obtain each sequence of the voltage and current. Voltage and current controllers for each sequence are implemented. However, the extractor causes considerable delay, and the delay restricts the control performance, especially for the current controller. To improve the dynamics of the current controller, the proposed scheme adopts a unified current controller without separating positive and negative sequences. By using discrete-time current controller, the control bandwidth can be extended significantly so that negative sequence current can be controlled. To enhance the performance, an additional feed-forward technique for output voltage regulation is proposed. The validity of the proposed controller is verified by experiments.

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      UCI(KEPA) : I410-ECN-0101-2022-560-001629731