• Journal of Drive and Control
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• v.13 no.3
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• pp.83-85
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• 2016

• Proceedings of the KIPE Conference
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• 2020.08a
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• pp.259-260
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• 2020

모듈화 멀티레벨 컨버터 (modular multilevel converter, MMC)는 고압직류송전(high-voltage direct current, HVDC)에 대한 기술이 발전함에 따라서 이와 관련된 전력변환 장치로써 많은 연구되어지고 있다. 10kV 이하로 구현되는 중압직류송전(medium-volatge direct current, MVDC) 시스템 및 모터 드라이브에 이용되는 MMC의 경우에는 수백 개의 직렬 서브모듈로 구성된 MMC가 사용되는 HVDC와 다르기 때문에 여러 모듈레이션 방식에서의 다른 장단점을 가지게 된다. 본 논문에서는 전력전자 시뮬레이션 툴인 PSIM을 이용하여 여러가지 모듈레이션의 MVDC으로의 적용에 있어서의 장단점을 분석한다.

• Journal of computational fluids engineering
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• v.19 no.3
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• pp.24-28
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• 2014

With ever rising concerns about saving of fossil fuel resource, there have been an increasing demand for use of energy more efficiently. The electric motor driven inverters can be a great help to improve energy efficiency. They are also used to control the motor speed to the actual need. Therefore the use of them can lead to reduce energy consumption. In particular, the medium voltage(MV) drive systems used for pumps, fans, steel rolling mills and tractions have widespread applications in the industry. They cover power ratings from 0.4MW to 40MW at the MV level of 2.3kV to 13.8kV. The majority of the installed MV drive systems however, are in the 1MW to 4MW range with voltage rating from 3.3kV to 6.6kV. But they are required to reduce size and weight like other power electronic equipments. In this paper, we studied on the 3.3kV(105A) compact rack type inverter system for improving the cooling efficiency. At first, we confirmed the tendency of temperature with computational simulation using ANSYS ICEPAK and actual experimental tests. And then we researched thermal performance improvement designs in order to reduce temperature of the transformer for the safe operation. It can reduce temperature of transformer that using pipe type flow guide in the system. As a result, we found out more efficient solution by thermal-fluid analysis.