Showing papers on "Forced outage published in 1995"
TL;DR: In this article, a Monte Carlo simulation is used to obtain a more detailed characterization of the probability distribution of production costs beyond the expected value, and a model involving the stochastic processes underlying the generator outages is presented.
34 citations
01 Jul 1995
TL;DR: In this article, a new approach for taking into account multistate units and common-mode outages in sequential Monte Carlo simulation is presented, and the results are compared with those given by an analytical technique.
Abstract: The paper presents a new approach for taking into account multistate units and common-mode outages in sequential Monte Carlo simulation Although the state space transition diagrams for multistate units and common-mode outages are well established, they can only be utilised in random or nonsequential simulation, and not in sequential simulation Using an equivalent or derating-adjusted forced outage rate for generating units instead of a multistate model can lead to pessimistic results Usually, the common-mode failure rate is small compared with independent failure rates, but such failures may have severe consequences on the power system performance Many utilities are, therefore, now using multistate and common-mode representations for composite power system adequacy analysis The conventional sequential simulation is capable of evaluating composite generation-transmission systems without these failure modes The effectiveness of the technique is demonstrated using several small examples Also, the adequacy of the RBTS and the IEEE-RTS is evaluated, and the results are compared with those given by an analytical technique These again demonstrate the applicability and effectiveness of the approach
29 citations
07 May 1995
TL;DR: In this article, the authors present a summary of the Canadian Electrical Association's Equipment Reliability Information System statistics on the forced outage performance characteristics of power transmission equipment (i.e., transformers, circuit breakers, cables, etc.) for Canadian utilities for the period 1988-1992.
Abstract: Frequent forced outages of power transmission equipment can significantly affect the performance of industrial and commercial power systems and the processes they control. Historical transmission reliability data provides the ability to predict the performance of various transmission line configurations and assess the economic impact of forced outages on industrial and commercial power systems. The prediction methodologies are presented in IEEE Std, 493 (i.e., IEEE Gold Book). This paper presents a summary of the Canadian Electrical Association's Equipment Reliability Information System statistics on the forced outage performance characteristics of power transmission equipment (i.e., transformers, circuit breakers, cables, etc.) for Canadian utilities for the period 1988-1992. The paper reveals the structure of the database and presents relevant summary data (i.e., the frequency and duration of forced outages) necessary for the application of these reliability methodologies. A knowledge of the primary causes of the major equipment forced outages as to whether the outages are primarily due to the subcomponents of the major equipment or to its terminal equipment is essential for designing, operating and maintaining a reliable transmission system. This paper discusses and identifies for each major equipment the primary subcomponent (e.g., transformer windings) and the terminal equipment (e.g., auxiliary equipment) which dominated the forced outage statistics of the major equipment for the five year period.
25 citations
TL;DR: In this paper, a Markovian model for the frequency and duration of the outages where several unit commitment constraints are considered is presented, where the mean and variance of the production costs may differ significantly if the failure and the repair rates of the generating units are changed although the respective forced outage rates remain unaltered.
16 citations
TL;DR: This paper presents a neural-network model which was designed to calculate the minimum frequency during forced outage of a generating unit, a strong indication of the severity of the fault.
3 citations
TL;DR: In this paper, two ways of modelling such scheduled maintenance whose length is less than that of the simulation period are presented, called partial planned or scheduled outages in the paper, and the effect of the different representations is shown on a simple numerical example by comparing the loss-ofload probability, the energy not served and the expected energy generations of the units.
1 citations
Patent•
28 Feb 1995
TL;DR: In this article, the authors proposed a fail-checking scheme to prevent any misjudgement at a fail check at each component at the time of operation of a forced outage circuit.
Abstract: PURPOSE:To prevent any misjudgement at a fail check each component at the time of operation of a forced outage circuit. CONSTITUTION:In order to monitor the operation condition of a forced outage circuit 30, an output side of this circuit 30 is connected to a forced outage circuit monitor 37 in a central processing unit 22 via a forced outage monitoring signal input terminal PB. This monitor 37 feeds a diagnoser 33 with a fail check prohibiting signal so as to make this diagnosing device 33 not perform a fail check whenever the forced outage circuit 30 is operating. With this fail check prohibiting signal, the diagnoser 33 will not check each component and a safety relay 28. Accordingly, any possible misjudgement of this fail check at the time of operation of the forced outage circuit 30 is thus prevented from occurring.