scispace - formally typeset
Search or ask a question
Topic

Fault indicator

About: Fault indicator is a research topic. Over the lifetime, 10057 publications have been published within this topic receiving 143482 citations. The topic is also known as: FCI & power line fault indicator.


Papers
More filters
01 Jan 2007
TL;DR: In this article, a new fault detection scheme for voltage fed inverter to improve the reliability of power electronic system, which is of paramount importance in the wide industrial applications, is presented.
Abstract: This paper presents a new fault detection scheme for voltage fed inverter to improve the reliability of power electronic system, which is of paramount importance in the wide industrial applications. The proposed method is achieved by using voltage across lower switches in each phase under the switch fault condition. The reconfiguration method is achieved by the four-switch topology connecting a faulty leg to the middle point of DC-link using bidirectional switches. The proposed method has a simple algorithm and fast fault detection time. Therefore, normal operation of the system after faults is continuously achieved by reconfiguration of system topology. The superior performance of the proposed fault detection and tolerance method are proved by simulation.

55 citations

Proceedings ArticleDOI
01 Nov 1997
TL;DR: The MiST PROFIT (Mixed Signal Test Program for Fault Insertion and Testing) software for hierarchical fault modeling, tolerance modeling, fault clustering and fault diagnosis of complex mixed-signal systems is discussed.
Abstract: In this paper we discuss the capabilities of the MiST PROFIT (Mixed Signal Test Program for Fault Insertion and Testing) software for hierarchical fault modeling, tolerance modeling, fault clustering and fault diagnosis of complex mixed-signal systems. The software is designed to exploit the relationships between high level system specifications and module-level faults in complex and nonlinear mixed signal systems. Hierarchical simulation based methods are used to capture fault effects at different levels of circuit abstraction. The key features of our approach are: (a) the ability to compute tolerance effects from nonlinear behavioral models at different levels of circuit design hierarchy accurately using low-cost simulation based methods, (b) the ability to perform compaction of fault effects while transferring fault effects from the leaf cells to the highest level behavioral models, (c) the ability to capture parametric (soft) failure effects over the entire anticipated range of faulty parameter values and (d) the ability to construct fault dictionaries given a set of least replaceable units to diagnose.

55 citations

Journal ArticleDOI
TL;DR: A new fault-tolerant control approach is presented, based on the on-line estimation of an eventual fault and the addition of a new control law to the nominal control law in order to reduce the fault effect once this fault is detected and isolated.
Abstract: Fault-tolerant control or reconfigurable control systems are generally based on a nominal control law associated with a fault detection and isolation module. A general review of techniques dealing with this problem is given and a new fault-tolerant control approach is presented. This method is based on the on-line estimation of an eventual fault and the addition of a new control law to the nominal control law in order to reduce the fault effect once this fault is detected and isolated. The performances of this method depend on the time delay between the occurrence of the fault and its detection and isolation. A modified approach is then proposed in order to avoid the problems generated by delays, false alarms or non-detection inherent to diagnosis techniques. These methods are applied to a pilot plant and their performances are compared and discussed.

55 citations

Journal ArticleDOI
TL;DR: In this article, a fault impedance estimation algorithm for phase-ground fault for ground distance relaying based on the negative-, zero, and comprehensive negative-zero-sequence current component is proposed.
Abstract: This study proposes a new fault impedance estimation algorithm of phase-ground fault for ground distance relaying based on the negative-, zero- and comprehensive negative-zero-sequence current component. The principle is based on the assumption that fault path is purely resistive, and the phase angle of fault point voltage and fault path current is equal to construct the fault impedance estimating equations for ground distance relay, which can eliminate the effect of fault path resistance, load current and power swing. PSCAD software simulations show the accuracy of proposed algorithm.

55 citations

Journal ArticleDOI
TL;DR: In this article, the authors formulate five different fault identification and signal estimation problems and derive the architecture of integrating the residual generator that isolates the fault and estimators that estimate the fault signals.
Abstract: We consider here both fault identification and fault signal estimation. Regarding fault identification, we seek either exact or almost fault identification. On the other hand, regarding fault signal estimation, we seek either $H_2$ optimal, $H_2$ suboptimal or Hinfinity suboptimal estimation. By appropriate combination of these two aspects, we formulate five different fault identification and fault signal estimation problems. We analyse and synthesize appropriate residual generators for fault identification and estimators which generate fault signal estimates for all these problems. Solvability conditions for all these problems are given. Also, for each of these problems, the architecture of integrating the residual generator that isolates the fault and estimators that estimate the fault signals is developed.

55 citations


Network Information
Related Topics (5)
Electric power system
133K papers, 1.7M citations
91% related
Voltage
296.3K papers, 1.7M citations
85% related
Control theory
299.6K papers, 3.1M citations
84% related
Control system
129K papers, 1.5M citations
84% related
Wind power
99K papers, 1.5M citations
82% related
Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202381
2022215
202127
202061
2019116
2018160