• Proceedings of the KIPE Conference
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• 2015.11a
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• pp.181-182
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• 2015

QZSI(Quasi Z-Source Inverter)를 이용한 유도전동기 제어시스템은 암단락 상태를 제어에 이용할 수 있어서 추가 컨버터 없이도 단일 구조로 가변 배터리 전압을 일정하게 승압할 수있다. 암단락을 이용한 승압은 직류단 전압제어가 보장되어야 하며 전압 제어기 성능이 인버터 출력 전류 제어에 상당한 영향을 미친다. 본 논문은 QZSI에서 직류 전압을 승압시키기 위한 암단락 시간을 효율적으로 제어하기 위한 변형 공간벡터방식을 이용하여 유도 전동기를 제어하고 시뮬레이션과 실험을 통해 이를 검증한다.

• Journal of the Korean Institute of Illuminating and Electrical Installation Engineers
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• v.25 no.8
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• pp.8-19
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• 2011

This paper was compared for the output voltage and efficiency of the single-phase Z-source inverter(ZSI) according to shoot through duty ratio D. The eight single-phase ZSI in this study are typical ZSI, Embedded ZSI(EZSI), Improved ZSI(IZSI), Quasi ZSI(QZSI), Series ZSI, Trans ZSI(TSI), Switched inductor ZSI(SL-ZSI) and Extended boost ZSI (exZSI). The eight ZSI are divided into two Groups. ; Group-1 which is ZSI with the ordinary voltage boost factor B, and Group-2 which is ZSI with the maximum voltage boost factor B. For the execution of the proposed study, the PSIM simulation was achieved under the condition of input DC voltage=150[V] of ZSI, load =30[${\Omega}$] and 60[Hz] output filter. The output voltage and efficiency of each ZSI were calculated within the limits of D=0.1~0.4. As a result, the output peak voltage of Group-2 was suddenly increased in a specified duty ratio D, and its efficiency was rapidly decreased. On the contrary, Group-1 shown the output and efficiency characteristics without sudden change compared to Group-2 despite the duty ratio increase. The efficiency of the Group-2 was sharply declined at duty ratio D of the most output voltage, but, in case of Group-1, the efficiency was slightly declined. Finally, the input DC current of ZSI with DCM and CCM was discussed.