• Title/Summary/Keyword: Screening curve method

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Generation Mix Analysis based on the Screening Curve and WASP-IV Techniques (탐색곡선법과 WASP-IV 모형을 이용한 국내 적정 전원구성 분석)

  • Jang, Se-Hwan;Park, Jong-Bae;Roh, Jae-Hyung
    • The Transactions of The Korean Institute of Electrical Engineers
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    • v.61 no.4
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    • pp.534-541
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    • 2012
  • This paper tries to elicit an optimal generation mix of Korea. Two approaches, using the screening curve method and taking advantage of a generation expansion planning tool, WASP-IV, are applied in getting the mix. The data used in this study is based on the 5th basic plan for long-term electricity supply and demand. The Load Duration Curve, that is needed for applying Screening Curve Method(SCM), is made based on the load profile in 2010. In our using SCM, the nuclear plant's operation characteristic, carbon emission cost and spinning reserve are considered. In using WASP-IV to get the adequate generation mix, the base and target demand forecasts in the 5th basic plan are used and the carbon emission cost is also considered. In this paper, It introduces the domestic adequacy generation mix in 2024 though SCM and WASP-IV.

A Fast Contingency Screening Algorithm for On-line Transient Security Assessment Based on Stability Index

  • Nam, Hae-Kon;Kim, Yong-Hak;Song, Sung-Geun;Kim, Yong-Gu
    • KIEE International Transactions on Power Engineering
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    • v.2A no.4
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    • pp.131-135
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    • 2002
  • This paper describes a new ultra-fast contingency screening algorithm for on-line TSA without time simulation. All machines are represented in a classical model and the stability index is defined as the ratio between acceleration power during a fault and deceleration power after clearing the fault. Critical clustering of machines is done based on the stability index, and the power-angle curve of the critical machines is drawn assuming that the angles of the critical machines increase uniformly, while those of the non-critical ones remain constant. Finally, the critical clearing time (CCT) is computed using the power-angle curve. The proposed algorithm is tested on the KEPCO system comprised of 900-bus and 230-machines. The CCT values computed with the screening algorithm are in good agreement with those computed using the detailed model and the SIME method. The computation time for screening about 270 contingencies is 17 seconds with 1.2 GHz PC.

A Estimation Method for Ratio of Generator Composition included Combined Heat and Power Using Screening Curve Method (열병합발전이 고려된 심사곡선법에 의한 전원구성 비율 산정방법의 연구)

  • Kim, Yong-Ha;Lee, Buhm;Choi, Sang-Kyu;Kim, Mi-Ye;Yeon, Jun-Hee;Kim, Myung-Ryul
    • Proceedings of the KIEE Conference
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    • 2005.07a
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    • pp.736-738
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    • 2005
  • For calculating optimal generation composition of The Basic Plan of Long Term Electricity Supply & Demand, the Screening Curve Method that using generation cost for planning is needed. This paper will induce optimal power system ratio included Combined Head and Power and suggest the method for optimal generation composition of The Basic Plan of Long Term Electricity Supply & Demand that considered policy side.

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Least Cost Generation Expansion Planning Methodology and Generation Cost (전원개발계획(電源開發計劃)에서의 비용최소화(費用最小化)와 발전원가(發電原價))

  • Chung, Do-Young;Park, Kyung-Suh;Park, Jong-Bai
    • Proceedings of the KIEE Conference
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    • 1992.07a
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    • pp.106-109
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    • 1992
  • This paper Introduces the concept of the generation cost of generating utilities and its calculation methods. Also, the economic evaluation method using generation cost which is called as a screening curve method will be presented along with the benefits and disadvantages of this concept. Next, the least-cost electric utility planning techniques which is used very widely in many countries will be Introduced In comparison with screening curve method. In this aspects, the optimal dynamic mix can be determined as a result. By comparing these two concepts, we will get the concrete concept why the economic evaluation method using generation cost can not be used for the future generation expansion planning.

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Reconfiguration of the Power Mix in Korea with the Introduction of Shale Gas and Analysis of Its Impact on Atmospheric Environment (셰일가스 도입으로 인한 전원믹스 재구성 및 환경 영향 분석)

  • Choi, Narae;Yeo, Minjoo;Kim, Yong Pyo
    • Particle and aerosol research
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    • v.10 no.1
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    • pp.19-25
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    • 2014
  • In line with the expected price reduction of natural gas associated with the introduction of shale gas, it is expected that the optimal power mix for the electric power generation be changed. In this study, the reconfigured power mix is estimated with the varying natural gas price by using the Screening Curve Method (SCM). It is found that about 3% and 9% coal in the overall power mix is replaced with natural gas if the natural gas price falls 20% and 40% of the current price, respectively. It is also found that the reconfigured power mixes would provide the reduction of the emissions of air pollutants which are equivalent to 369 and 807 MUS$.

Reliability Improvement of Titania Ceramics with Surface Flaw Through High Voltage Screening

  • Tanaka, Tomohiro;Kishimoto, Akira
    • The Korean Journal of Ceramics
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    • v.5 no.4
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    • pp.386-389
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    • 1999
  • Effect of high voltage screening was examined on mechanical strength of titania ceramics with two different surface roughness. Roughly finished sample showed degraded mechanical strength meaning that the introduced flaw played the role of starting point of mechanical fracture. On such sample, electrically weak parts were eliminated by applying a screening field. Mechanical strength measurement on survived parts revealed that after screening the Weibull plots bended to become a convex curve while plots at high strength region were almost the same. This result means that relatively low mechanical strength parts were eliminated by the electrical method. As a result the Weibull modulus calculated from all the data increased, demonstrating the effect of high voltage screening on titania ceramics containing fracture controlling surface flaws. Roles of the surface flaw such as a common weak spot for both failures are disscussed in relation to the electric field concentration similar to that of mechanical stress.

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Free Spanning of Offshore Pipelines by DNV 2002 (DNV 2002에 의한 해저관로의 자유경간해석)

  • Choi, Han-Suk;Joo, Joo-Kyung
    • Proceedings of the Korea Committee for Ocean Resources and Engineering Conference
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    • 2002.10a
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    • pp.29-33
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    • 2002
  • A procedure of free span and fatigue analysis of offshore pipelines was made per DNV-RP-F105, 2002. The new method includes the axial force and deflection load in pipelines. The screening criteria were used to calculate the allowable span lengths. The screening criteria allow small amplitudes of vortex-induced vibration due to wave and current loading. However, the induced pipe stress is very small and usually below the limit stress of a typical S-N curve. A simplified method was established to calculate the fatigue damage due to long-term current distribution. The long-term current statistics was assumed with a 3-parameter Weibull distribution. The fatigue damage was estimated for the span lengths obtained from the screening criteria for various conditions. Sample calculations show the effect of axial force for various boundary conditions.

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Optimization of the Tooth Surface in the Helical Gears Using a Response Surface Method (반응표면법을 이용한 헬리컬기어 치형수정의 최적화)

  • Park, Chan-Il
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2005.11a
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    • pp.760-763
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    • 2005
  • Optimum design of the tooth surface for the reduction of transmission error is very difficult to determine analytically due to nonlinearity of transmission error under the several load condition. The design of tooth surface that can give a low noise under the various load condition is very important. Therefore, this study proposes the method to determine the optimal lead curve and robust design of the tooth surface by using the response surface method. To do so, the design variables are selected by a screening experiment. Then the fitted regression model Is built with the check of the usefulness of the model. The model with constraints is solved to obtain the optimum values for the lead curve and the robust design fur the tooth surface.

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Quantification of Globotriaosylsphingosine in Urine using UPLC-ESI-MS/MS; Application for Screening Fabry Disease (파브리병의 신속한 진단을 위한 소변 중 Globotriaosylsphingosine의 UPLC-ESI-MS/MS 분석법)

  • Yoon, Hye-Ran
    • YAKHAK HOEJI
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    • v.60 no.1
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    • pp.15-20
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    • 2016
  • Globotriaosylsphingosine (lyso Gb3) is considered as one of the biomarkers for Fabry disease. A rapid and simple UPLC-MS/MS method was developed for the determination of reliable biomarker, lyso Gb3. Total analytical procedure takes only 15 min including sample preparation and MS/MS analysis. Limit of detection was 0.85 ng/ml (S/N=3). The calibration curve was linear over the range of 2.0~400.0 ng/ml ($R^2=0.9999$). Inter-day and intra-day assay accuracy were 93.4~100.6% (RSD, 0.6~6.0%) and 97.5~100.7% (RSD, 3.6~5.2%). Absolute recoveries of 97.6~98.6 showed excellence of a new analytical method. The method was applied to human and mice urines, proved the suitability for the quantification of lyso-Gb3 for screening, diagnosis and therapeutic monitoring of Fabry disease patients.

The Analysis of Effect in Order to Consider Combined Heat and Power Capacity in the Basic Plan of Long Term Electricity Supply & Demand (전력수급기본계획에 열병합발전 설비 반영시의 효과분석에 관한 연구)

  • Kim, Yong-Ba;Moon, Jung-Ho;Yeon, Jun-Hee;Jung, Hyun-Sung;Woo, Sung-Min;Kim, Mi-Ye
    • Journal of Energy Engineering
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    • v.16 no.1 s.49
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    • pp.22-31
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    • 2007
  • This paper addresses methodology in order to consider CHP (Combined Heat and Power) capacity in the Basic Plan of Long Term Electricity Supply & Demand and presents effects on it. The method performs state in extent that do not change maximum in the Basic Plan of Long Term Electricity Supply & Demand. For analysis that occurs some advantage this method compares with Basic Plan of Long Term Electricity Supply & Demand. It includes EES (Expected Energy Served), Fuel consumption, amount of $CO_{2}$ emission reduction.