• 제목/요약/키워드: fault detection

검색결과 1,632건 처리시간 0.026초

Detection and Diagnosis Solutions for Fault-Tolerant VSI

  • Cordeiro, Armando;Palma, Joao C.P.;Maia, Jose;Resende, Maia J.
    • Journal of Power Electronics
    • /
    • 제14권6호
    • /
    • pp.1272-1280
    • /
    • 2014
  • This paper presents solutions for fault detection and diagnosis of two-level, three phase voltage-source inverter (VSI) topologies with IGBT devices. The proposed solutions combine redundant standby VSI structures and contactors (or relays) to improve the fault-tolerant capabilities of power electronics in applications with safety requirements. The suitable combination of these elements gives the inverter the ability to maintain energy processing in the occurrence of several failure modes, including short-circuit in IGBT devices, thus extending its reliability and availability. A survey of previously developed fault-tolerant VSI structures and several aspects of failure modes, detection and isolation mechanisms within VSI is first discussed. Hardware solutions for the protection of power semiconductors with fault detection and diagnosis mechanisms are then proposed to provide conditions to isolate and replace damaged power devices (or branches) in real time. Experimental results from a prototype are included to validate the proposed solutions.

영상변류기 동작 방식을 이용한 2개의 컨버터 병렬 운전시 고장 탐지 및 분리 (Fault Detection and Isolation of Parallel Operation of Two Converters Using Zero Current Transformer Method)

  • 손승찬;성세진
    • 전력전자학회논문지
    • /
    • 제5권4호
    • /
    • pp.409-416
    • /
    • 2000
  • 시스템 특성상 fault tolerant system을 위해 두개의 컨버티를 1개의 전류센서를 사용하여 영상변류기 동적 방식으토 병렬 운전하는 경우 컨버터에 고자이 발생하면 영상변류기 출력은 두 컨버터 공급 전류 차이이므로, 어떤 컨버터에서 고장이 발생하였는지 고정 탐지 및 분리가 곤란히였다. 본 논문에사는 fault tolerant system를 위해 2 개의 컨버터를 병렬 운전하는 경우 캔버터의 고장 탐지 및 분리를 위한 방안올 제시하고 실험을 통하여 제안한 방법의 타당성을 확인하였다.

  • PDF

A Matlab and Simulink Based Three-Phase Inverter Fault Diagnosis Method Using Three-Dimensional Features

  • Talha, Muhammad;Asghar, Furqan;Kim, Sung Ho
    • International Journal of Fuzzy Logic and Intelligent Systems
    • /
    • 제16권3호
    • /
    • pp.173-180
    • /
    • 2016
  • Fault detection and diagnosis is a task to monitor the occurrence of faults and pinpoint the exact location of faults in the system. Fault detection and diagnosis is gaining importance in development of efficient, advanced and safe industrial systems. Three phase inverter is one of the most common and excessively used power electronic system in industries. A fault diagnosis system is essential for safe and efficient usage of these inverters. This paper presents a fault detection technique and fault classification algorithm. A new feature extraction approach is proposed by using three-phase load current in three-dimensional space and neural network is used to diagnose the fault. Neural network is responsible of pinpointing the fault location. Proposed method and experiment results are presented in detail.

HVDC 선로 내 초전도 한류기와 전력기기들의 복합 구성을 통한 고장 검출에 관한 연구 (The Study on The Complex Composition By SFCL and Power Equipments for Fault Detection in HVDC Line)

  • 김명현;김재철
    • 전기학회논문지
    • /
    • 제67권8호
    • /
    • pp.1113-1118
    • /
    • 2018
  • Protection in HVDC(High Voltage Direct Current) have the very fast velocity of fault detection. Because Fault in HVDC has the fast propagation, large currents, high interruption cost. The focus to velocity caused possibility of errors like a detection error like a high impedance fault. In this paper, Proposed complex composition for get the reliability and velocity. That used SFCL(Super Conducting Fault Current Limiter), Protection Zone and DTS(Distributed Temperature Sensing). The SFCL was detect the fault by quench and DTS&Protection Zone were perceive the detect by variation too. To examine the proposed method, PSCAD/EMTDC simulated. The results of simulation, proposed methods could the detect of fault to whole HVDC line. And that improved the reliability of fault clearing.

고속전철용 Cab Cubicle의 이상검출과 고장부위 추정에 관한 연구 (A Study on Fault Detection and Fault Device Estimation Method for Cab Cubicle in High Speed Electrical Train)

  • 장영건;조경환;박계서;최권희
    • 한국철도학회:학술대회논문집
    • /
    • 한국철도학회 2000년도 춘계학술대회 논문집
    • /
    • pp.188-194
    • /
    • 2000
  • This study is about fault detection and fault area detection of LV circuit in Cab Cubicle system which have control of train to keep safety in High Speed Train. LV circuit is operated with diagnosis system like safety system. In this paper, we suggest a design and an implementation method to detect fault or to detect fault area automatically about LV circuit. The implemented system is tested successfully after implementation of some function. We expect reduction to diagnosis area or repair time by fault area module

  • PDF

퍼지모델을 이용한 비선형시스템의 센서고장 검출식별 (A Fuzzy Model Based Sensor Fault Detection Scheme for Nonlinear Dynamic Systems)

  • 이기상
    • 전기학회논문지
    • /
    • 제56권2호
    • /
    • pp.407-414
    • /
    • 2007
  • A sensor fault detection scheme(SFDS) for a class of nonlinear systems that can be represented by Takagi-Sugeno fuzzy model is proposed. Basically, the SFDS may be considered as a multiple observer scheme(MOS) in which the bank of state observers and the detection & isolation logic are included. However, the proposed scheme has two great differences from the conventional MOSs. First, the proposed scheme includes fuzzy fault detection observers(FFDO) that are constructed based on the T-S fuzzy model that provides very good approximation to nonlinear dynamic systems. Secondly, unlike the conventional MOS, the FFDOS are driven not parallelly but sequentially according to the predetermined sequence to avoid the massive computational burden, which is known to be the biggest obstacle to the practical application of the multiple observer based FDI schemes. During the operating time, each FFDO generates the residuals carrying the information of a specified fault, and the corresponding fault detection logic unit performs the logical operations to detect and isolate the fault of interest. The proposed scheme is applied to an inverted pendulum control system for sensor fault detection/isolation. Simulation study shows the practical feasibility of the proposed scheme.

Robust fault detection and diagnosis in boiler systems

  • Kim, Yu-Soong;Kwon, Oh-Kyu;Hong, Il-Sun
    • 제어로봇시스템학회:학술대회논문집
    • /
    • 제어로봇시스템학회 1994년도 Proceedings of the Korea Automatic Control Conference, 9th (KACC) ; Taejeon, Korea; 17-20 Oct. 1994
    • /
    • pp.537-542
    • /
    • 1994
  • This paper gives a general survey of model-based fault detection and dignosis methods. Specific applications of these ideas to boiler systems will also be discussed. A novel aspect of the fault detection technique described here is that it explicitly accounts for the effects of using simplified models and errors from linearizing a nonlinear system at an operation point. Inclusion of these effects is shown to lead to novel fault detection procedures which outperform existing methods when applied to typical fault scenarios in boiler systems.

  • PDF

대규모 선형시불변 시스템을 위한 H_ 고장검출 관측기 설계 (H_ Fault Detection Observer Design for Large Scale Time-Invariant Systems)

  • 이호재;김도완
    • 제어로봇시스템학회논문지
    • /
    • 제15권8호
    • /
    • pp.818-822
    • /
    • 2009
  • In this paper, we consider a decentralized observer design problem for fault detection in large-scaled linear time-invariant systems. Since the fault detection residual is desired to be sensitive on the fault, we use the H_ index performance criterion. Sufficient conditions for the existence of such an observer is presented in terms of linear matrix inequalities. Simulation results show the effectiveness of the proposed method.

사고위치에 따른 분산전원 고립운전 상태 검출에 관한 연구 (The Study of Islanding State Detection of Distributed Generation Considering Fault Location)

  • 정승복;김재철
    • 한국조명전기설비학회:학술대회논문집
    • /
    • 한국조명전기설비학회 2003년도 학술대회논문집
    • /
    • pp.107-109
    • /
    • 2003
  • This paper studies islanding detection distributed of distributed generation(DG). The study of islanding detection has been disconnected DG when power islanding was detected but fault type wasn't distingish. Nearby feeder fault the fault of feeder that not interconnected DG, is a little affect DG and distribution system. Therefore DG not need to disconnect distribution system. We studied islanding detection algorithm considering fault location.

  • PDF

EPB 시스템의 센서 고장 허용 제어 기법 (Fault Tolerant Control of Sensor Fault of EPB System)

  • 이원구;이영옥;장민석;이충우;정정주;정한별
    • 한국자동차공학회논문집
    • /
    • 제18권4호
    • /
    • pp.8-17
    • /
    • 2010
  • In this paper, a fault tolerant control against sensor faults of electric parking brake (EPB) is proposed. Fault tolerant control method of EPB system is strongly demanded since sensor faults can endanger a driver's safety. In this paper, a clamp force estimation method is presented using motor's armature current and angular velocity. Clamp force estimation method is applied for fault detection method with parity equations. The goal of the detection method is to detect and identify faults in encoder, current sensor, force sensor, and parking cable. And a switching logic for fault tolerant control against the three sensor faults is suggested. Experimental results show that the proposed force estimation method satisfies the specifications of EPB system. The effectiveness of the fault detection method is validated with experimental results. Although a single sensor fault happens, EPB system with the proposed fault detection method does not develop into a failure on subsystem or system level.