• 제목/요약/키워드: SST(Solid State Transformer)

검색결과 20건 처리시간 0.029초

운행 프로파일 기반 도시철도차량용 반도체 변압기의 전력 반도체 소자 수명 평가 (Operation-Profile Based Lifetime Evaluation of Power Semiconductor Devices in Solid-State Transformer for Urban Railway Vehicles)

  • 최의민;박진혁;김명룡;이준석
    • 전력전자학회논문지
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    • 제25권6호
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    • pp.496-502
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    • 2020
  • The reliability of a solid-state transformer (SST) is one of the important aspects to consider when replacing a conventional low-frequency passive transformer with SST for urban railway vehicles. Lifetime evaluation of SST in the design phase is therefore essential in guaranteeing a certain SST reliability. In this study, a lifetime evaluation of power semiconductor devices in SST is performed with respect to temperature stress. For a case study, a 3 MW SST with three kinds of power modules (one IGBT module and two SiC-MOSFET modules) is used for the lifetime estimation under the operation profile of urban railway vehicles.

직류 배전망 연계를 위한 3상 13.2kV급 반도체 변압기 시스템에 대한 연구 (A Study on the 3-phase 13.2 kV Solid State Transformer for the DC Distribution)

  • 정동근;윤혁진;박시호;김호성;김명호;류명효;백주원
    • 전력전자학회논문지
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    • 제26권5호
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    • pp.315-324
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    • 2021
  • A solid state transformer (SST) that can interface an MVAC of three-phase 13.2 kV and a 1.5 kV DC distribution. SST consists of an AC/DC converter and a DC/DC converter with a high-frequency isolation transformer (HFIT). The AC/DC converter consists of cascaded NPC full-bridge to cope with the MVAC. The DC/DC converter applies a quad active bridge (QAB) topology to reduce the number of the HFIT. Topology analysis and controller design for this specific structure are discussed. In addition, the insulation of HFIT used in DC/DC converters is considered. The discussion is validated using a 300 kVA three-phase SST prototype.

반도체 변압기용 멀티레벨 H-bridge 컨버터에 적용한 간단한 전압 밸런싱 방법 (A Simplified Voltage Balancing Method Applied to Multi-level H-bridge Converter for Solid State Transformer)

  • 정동근;김호성;백주원;조진태;김희제
    • 전력전자학회논문지
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    • 제22권2호
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    • pp.95-101
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    • 2017
  • A simple and practical voltage balance method for a solid-state transformer (SST) is proposed to reduce the voltage difference of cascaded H-bridge converters. The tolerance device components in SST cause the imbalance problem of DC-link voltage in the H-bridge converter. The Max/Min algorithms of voltage balance controller are merged in the controller of an AC/DC rectifier to reduce the voltage difference. The DC-link voltage through each H-bridge converter can be balanced with the proposed control methods. The design and performance of the proposed SST are verified by experimental results using a 30 kW prototype.

배전용 반도체 변압기 구현을 위한 SiC MOSFET 기반 전력변환회로 단위모듈 설계에 관한 연구 (Design and Implementation of a Power Conversion Module for Solid State Transformers using SiC MOSFET Devices)

  • 임정우;조영훈
    • 전력전자학회논문지
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    • 제22권2호
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    • pp.109-117
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    • 2017
  • This paper describes the design and implementation of a unit module for a 10 kVA class 13.2 kV/220 V unidirectional solid-state transformer (SST) with silicon-carbide metal-oxide-semiconductor field-effect transistors. The proposed module consists of an active-front-end (AFE) converter to interface 1320 V AC voltage source to 2500 V DC link and an isolated resonant DC-DC converter for 500 V low-voltage DC output. The design approaches of the AFE and the isolated resonant DC-DC converters are addressed. The control structures of the converters are described as well. The experiments for the converters are performed, and results verify that the proposed unit module can be successfully adopted for the entire SST operation.

양극성 직류 배전망에 적용 가능한 3포트 NPC 기반의 DAB 컨버터에 대한 연구 (A Study of the Three Port NPC based DAB Converter for the Bipolar DC Grid)

  • 윤혁진;김명호;백주원;김주용;김희제
    • 전력전자학회논문지
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    • 제22권4호
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    • pp.336-344
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    • 2017
  • This paper presents the three-port DC-DC converter modeling and controller design procedure, which is part of the solid-state transformer (SST) to interface medium voltage AC grid to bipolar DC distribution network. Due to the high primary side DC link voltage, the proposed converter employs the three-level neutral point clamped (NPC) topology at the primary side and 2-two level half bridge circuits for each DC distribution network. For the proposed converter particular structure, this paper conducts modeling the three winding transformer and the power transfer between each port. A decoupling method is adopted to simplify the power transfer model. The voltage controller design procedure is presented. In addition, the output current sharing controller is employed for current balancing between the parallel-connected secondary output ports. The proposed circuit and controller performance are verified by experimental results using a 30 kW prototype SST system.

반도체 변압기를 위한 고압 IGBT의 스위칭 손실 특성 비교 (A Comparative Analysis of Switching Losses of High Voltage IGBTs in Solid State Transformer Applications)

  • 윤춘기;조영훈;김호성;백주원;조영표
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2016년도 전력전자학술대회 논문집
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    • pp.107-108
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    • 2016
  • Solid State Transformer(SST) has been recently regarded as a good alternative to conventional low frequency transformer. SST is consist of several high voltage power stage, so it is important to select optimal semiconductor switches for specification. This paper presents optimal IGBT switches for low switching losses using analyzing switching characteristics of several high voltage IGBT switches. Double Pulse Tester(DPT) experiment is used to verify characteristics of this IGBT switches.

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지능형 반도체 변압기용 다권선 고주파 변압기 설계 방안 (Design Methodology of Multi-winding High-frequency Transformer for Solid-state Transformer)

  • 박시호;류명효;김호성;차헌녕
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2018년도 전력전자학술대회
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    • pp.306-307
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    • 2018
  • 본 논문은 지능형 반도체 변압기 (Solid-state transformer, SST)용 다권선 고주파 변압기의 최적 설계 방안을 제안한다. 설계된 변압기는 10 kHz의 스위칭 주파수를 운전 조건으로 하며, 60 kVA의 정격 용량을 가진다. 특히 13.2 kV의 중전압 계통에 적용하기 위해 30 kV 이상의 절연 내력으로 설계하였으며, SST 시스템의 부피가 커지는 것을 억제하기 위해 3 입력-1 출력으로 구성된 4-권선 방식으로 구성하였다. 절연 내력을 만족시키기 위해 teflon PTFE를 이용한 내부 보빈과 외부 보빈 및 가드를 제작하였으며, 누설 인덕턴스 최소화 및 근접 효과와 표피 효과로 인한 AC 손실을 최소화하기 위해 쉘-타입으로 설계하였다. 시제품 제작 후 60 kVA의 정격 하에 동작 검증을 완료하였으며, 내전압 시험을 이용하여 30 kV급의 절연 내력을 검증하였다.

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Solid State Transformer를 위한 양방향 Dual Active Bridge DC/DC 컨버터 최적 설계 (Design Optimization of Bi-directional Dual Active Bridge DC/DC Converter for Solid State Transformer)

  • 최현준;박화평;정지훈
    • 전력전자학회:학술대회논문집
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    • 전력전자학회 2014년도 전력전자학술대회 논문집
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    • pp.197-198
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    • 2014
  • 본 논문에서는 양방향 DC-DC Dual Active Bridge (DAB) 컨버터의 수학적 모델로부터 컨버터의 변압기와 결합 인덕터의 최적 설계 방법을 제안한다. DAB컨버터는 1차 측과 2차 측이 동일한 구조를 가진 고효율 절연형 컨버터로써, Soft Switching이 쉽게 구현되고, 양방향으로 Power를 전달 할 수 있는 장점으로 널리 사용되고 있다. 본 논문에서 제안하는 컨버터는 Solid State Transformer (SST) 용으로 변압기 1차 측과 2차 측의 턴 비가 동일한 구조로써, 최대의 ZVS영역을 확보하고, 전력 변환 효율을 극대화 할 수 있다. 3.3 kW급 시제품을 제작하여 제안하는 컨버터의 타당성을 검증하고자 한다.

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