• Title, Summary, Keyword: Bulk system reliability evaluation

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Incorporating Station Related Aging Failures in Bulk System Reliability Analysis

  • Billinton Roy;Yang Hua
    • KIEE International Transactions on Power Engineering
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    • v.5A no.4
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    • pp.322-330
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    • 2005
  • This paper proposes methods to incorporate station related aging failures in composite system reliability assessment. Aging failures of station components, such as circuit breakers and bus bars, are a major concern in composite power system planning and operation as an increasing number of station components approach the wear-out phase. This paper presents probabilistic models for circuit breakers involving aging failures and relevant evaluation techniques to examine the effects of station related aging outages. The technique developed to incorporate station related aging failures are illustrated by application to a small composite test system. The paper illustrates the effects of circuit breaker aging outages on bulk system reliability evaluation and examines the relative effects of variations in component age. System sensitivity analysis is illustrated by varying selected component parameters. The results show the implications of including component aging failure considerations in the overall analysis of a composite system.

Reliability Evaluation for Bulk Transmission System by Monte Carlo Simulation Method (몬테칼로 시뮬레이션기법에 의한 대전력계통 신뢰도산정)

  • Kim, C.S.;Ko, Y.;Kwun, Y.H.;Choo, J.B.;Ko, H.W.;Lee, S.J.
    • Proceedings of the KIEE Conference
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    • pp.96-99
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    • 1992
  • In the planning stage of bulk power transmission system, reliability evaluation has been a major issue in the sense of suppling reliable power at the minimum cost. MEXICO program, based on Monte-Carlo simulation method, is known as a valuable tool for reliability evaluation. This paper presents the empirical study results when using MEXICO program for IEEE-RTS, IEEE-MRTS and KEPCO-233 system.

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Probabilistic Reliability Evaluation of Power System using TRELSS I (TRELSS를 이용한 전력계통의 확률론적 신뢰도 평가 I)

  • Kang, Sung-Rok;Tran, Tungtinh;Choi, Jae-Sok;Jeon, Dong-Hoon;Moon, Seung-Pil;Choo, Jin-Boo
    • Proceedings of the KIEE Conference
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    • pp.62-66
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    • 2003
  • In recent, the importance and necessity of some studies on reliability evaluation of grid comes from the recent black-out accidents occurred in the world. The quantity evaluation of transmission system reliability is very important under competitive electricity environment. The reason is that the successful operation of electric power under the deregulated electricity market depends on transmission system reliability management. This paper introduces features and operation modes of the Transmission Reliability Evaluation for Large-Scale Systems(TRELSS) Version 5_1, a program made in EPRI, for assessing reliability indices of composite power system. The package accesses not only bulk but also buses indices for reliability evaluation of composite powers system. The characteristics of the TRELSS program are illustrated by the case studies using the IEEE 25buses system.

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Probabilistic Reliability Evaluation of KEPCO System using TRELSS - V (TRELSS를 이용한 우리나라의 확률론적 신뢰도 평가에 관한 연구 - V)

  • Jeon D.;Kim T.;Cha S.;Choo J.;Tran T.;Lee S.;Choi J.
    • Proceedings of the KIEE Conference
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    • pp.11-14
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    • 2004
  • In recent, the importance and necessity of some studies on reliability evaluation of grid comes from the recent black-out accidents occurred in the world. The quantity evaluation of transmission system reliability is very important under competitive electricity environment. The reason is that the successful operation of electric power under the deregulated electricity market depends on transmission system reliability management. This paper introduces features and operation modes of the Transmission Reliability Evaluation for Large-Scale Systems(TRELSS) Version 6.2, a program made in EPRI, for assessing reliability indices of composite power system. The package accesses not only bulk but also buses indices for reliability evaluation of composite powers system. The characteristics of the TRELSS program are illustrated by the case studies using the KEPCO system

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Construction of Database for Reliability Evaluation of the Large Power System (확률론적 공급신뢰도 평가를 위한 전압레벨별 데이터베이스 구축방안)

  • Moon, S.P.;Shin, T.W.;Jang, B.H.;Jeon, D.H.;Kwak, H.S.;Han, G.N.;Choi, J.S.
    • Proceedings of the KIEE Conference
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    • pp.74-75
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    • 2006
  • The reliability evaluation methods for the bulk power system habe been studied by several electric utilities. The evaluation methods based on the probability theory and the computer packages are being developed or already practicalized. But without correct probabilistic data, accurate result couldn't be expected. In this point, the construction of database is needed. Some of probabilistic data for evaluation of bulk power system are shown in this paper.

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A Study on Probabilistic Reliability Evaluation Considering Transmission System :TRELSS and TranRel (송전계통을 고려한 확률론적 신뢰도 평가에 관한 연구 : TRELSS and TranRel)

  • 최재석;강성록;트란트롱틴;전동훈;문승필;추진부
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.53 no.1
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    • pp.43-55
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    • 2004
  • This paper presents a study on evaluating the reliability indices considering a transmission system. Because successful operation of electric power under the deregulated electricity market depends on transmission system reliability management, quantity evaluation of transmission system reliability is very important. This paper introduces features and operation modes of the Transmission Reliability Evaluation for Large-Scale Systems(TRELSS) Version 6.0, a commercial program made in EPRI, and TranRel-I V3.2, a educational program made in GSNU(GyeongSang National University) for assessing reliability indices of composite power system. The packages access not only bulk but also bus indices for reliability evaluation of composite powers system. The practicality, effectiveness and future works of this methodology are illustrated by demonstrations of two case studies of modified IEEE 25 buses reliability test system using TRELSS and TranRel-I and a brief case study for the KEPCO size system using TranRel-II made in GSNU.

A Study on the Reliability Evaluation of KEPCO Long-term Transmission System (한전의 장기 송전계통 공급신뢰도 평가에 관한 연구)

  • Chu, Jin-Boo;Moon, Ki-Seung;Sin, Sang-Gyoun;Lee, Ki-Seon
    • Proceedings of the KIEE Conference
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    • pp.67-69
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    • 1993
  • The purpose of the facility investment planning for bulk power system is to appropriately configure the power system network to supply the load, which has the supply capability satisfying the probabilistically changing load on the desired reliability level. In order to achieve this purpose, this paper represents the reliability evaluation of the KEPCO's real system with using the MEXICO model, and builds the data base of the power system operation in order to effectively handle the computer model.

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A Reliability Evaluation of Bulk Power System by Simulation Model (시뮬레이션 모형에 의한 대전력계통 신뢰도 평가)

  • Ko, Yo;Kim, C.S.;Kwan, Y.H.;Ko, H.W.;Choo, J.B.;Jung, T.H.
    • Proceedings of the KIEE Conference
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    • pp.51-54
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    • 1991
  • As a transmission network planning should be optimal in the sense of technology, economy and reliability, an adequate optimization tool is required. The simulation model is valuable at this case. It enables the planner to detect the weak points of the system by providing the planner with unsupplied powers, operating cost, and active losses at each substation node and each line. This paper represent the example of application of simulation model for power system planning.

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A Fabrication of IR $CO_2$ Sensor based on the MEMS and Characteristic Evaluation (MEMS 기반의 IR $CO_2$ 센서 제작 및 특성 평가)

  • Kim Shin-Keun;Han Yong-Hee;Moon Sung-Wook
    • The Transactions of the Korean Institute of Electrical Engineers C
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    • v.54 no.5
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    • pp.232-237
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    • 2005
  • In this paper, we fabricated $CO_2$ gas sensor based on the MEMS infrared sensor and characterized its electrical and $CO_2$-sensing properties. The fabricated $CO_2$ gas sensor by MEMS technique has many advanges over NDIR(nondispersive) $CO_2$ sensor such as monolithic fabrication, very high selectivity on $CO_2$, low power consumption and compact system. Microbolometer by surface micromachining was fabricated for gas detector and $CO_2$ filter chip by bulk micromachining was fabricated for signal referencing. By using the proposed and fabricated gas sensor, we are expected to measure $CO_2$ concentration more accurately with high reliability.

The New X-ray Induced Electron Emission Spectrometer

  • Yu.N.Yuryev;Park, Hyun-Min;Lee, Hwack-Ju;Kim, Ju-Hwnag;Cho, Yang-Ku;K.Yu.Pogrebitsky
    • Proceedings of the Korea Crystallographic Association Conference
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    • pp.5-6
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    • 2002
  • The new spectrometer for X-ray Induced Electron Emission Spectroscopy (XIEES) .has been recently developed in KRISS in collaboration with PTI (Russia). The spectrometer allows to perform research using the XAFS, SXAFS, XANES techniques (D.C.Koningsberger and R.Prins, 1988) as well as the number of techniques from XIEES field(L.A.Bakaleinikov et all, 1992). The experiments may be carried out with registration of transmitted through the sample x-rays (to investigate bulk samples) or/and total electron yield (TEY) from the sample surface that gives the high (down to several atomic mono-layers in soft x-ray region) near surface sensitivity. The combination of these methods together give the possibility to obtain a quantitative information on elemental composition, chemical state, atomic structure for powder samples and solids, including non-crystalline materials (the long range order is not required). The optical design of spectrometer is made according to Johannesson true focusing schematics and presented on the Fig.1. Five stepping motors are used to maintain the focusing condition during the photon energy scan (crystal angle, crystal position along rail, sample goniometer rail angle, sample goniometer position along rail and sample goniometer angle relatively of rail). All movements can be done independently and simultaneously that speeds up the setting of photon energy and allows the using of crystals with different Rowland radil. At present six curved crystals with different d-values and one flat synthetic multilayer are installed on revolver-type monochromator. This arrangement allows the wide range of x-rays from 100 eV up to 25 keV to be obtained. Another 4 stepping motors set exit slit width, sample angle, channeltron position and x-ray detector position. The differential pumping allows to unite vacuum chambers of spectrometer and x-ray generator avoiding the absorption of soft x-rays on Be foil of a window and in atmosphere. Another feature of vacuum system is separation of walls of vacuum chamber (which are deformed by the atmospheric pressure) from optical elements of spectrometer. This warrantees that the optical elements are precisely positioned. The detecting system of the spectrometer consists of two proportional counters, one scintillating detector and one channeltron detector. First proportional counter can be used as I/sub 0/-detector in transmission mode or by measuring the fluorescence from exit slit edge. The last installation can be used to measure the reference data (that is necessary in XANES measurements), in this case the reference sample is installed on slit knife edge. The second proportional counter measures the intensity of x-rays transmitted through the sample. The scintillating detector is used in the same way but on the air for the hard x-rays and for alignment purposes. Total electron yield from the sample is measured by channeltron. The spectrometer is fully controlled by special software that gives the high flexibility and reliability in carrying out of the experiments. Fig.2 and fig.3 present the typical XAFS spectra measured with spectrometer.

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