• Title/Summary/Keyword: generated load

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A Study on the Optimal Plant Mix of Pump Storage in the Competitive Power Markets (경쟁시장에서의 양수발전 적정 규모 산정에 관한 연구)

  • Choi, Dong-Chan;Kim, Tae-Young;Park, Seong-Wan;Han, Seok-Man;Kim, Bal-Ho H.
    • Proceedings of the KIEE Conference
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    • 2009.07a
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    • pp.567_568
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    • 2009
  • In the past, pumping-storage generator pumped the water from the lower part storage to the upper part storage during the base load periods. And, it generated during the peak load or when other generator was outage. However, pumping-storage generator will operate different ways in the competitive power markets. It will pump during lower price periods and generate at higher price periods. This paper presents economic analysis of pumping-storage generator using price (or SMP) duration curve.

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Performance Analysis for Passive Filter Considering Allowable Limits of Tolerance (오차의 허용범위를 고려한 수동형 필터의 특성 해석)

  • Kim, Jong-Gyeum;Kim, Il-Jung
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.58 no.1
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    • pp.38-43
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    • 2009
  • Reactors are connected with capacitors to passive filter circuits for reducing harmonics caused by power conversion application. This passive filter frequently gets out of order by voltage and current stress. Especially filter reactor has too much voltage harmonics components, its trouble rate is higher than capacitor. In this paper, we analyzed voltage and current of reactor and capacitor used for passive filter by simulation and measurement. If reactor has a tolerance on variation of reactance value, series resonance frequency is different from originally filter design frequency and parallel resonance can be generated at the close point of the former. Because filter absorbs harmonic component of non-linear load, much of harmonic voltage has been impacted on reactor.

A Study of Power Output Characteristics for the Magnesium Metal Fuel Cell (마그네슘 금속연료전지의 출력특성에 관한 연구)

  • Kim, Yong-Hyuk
    • The Transactions of the Korean Institute of Electrical Engineers P
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    • v.63 no.3
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    • pp.212-217
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    • 2014
  • The electric power output characteristics of magnesium fuel cell were investigated with regard to internal resistance. A equivalent circuit with the series-connected three internal resistance was introduced to analyze of the response to change of power. The power output analysis was employed in order to investigate the effect of internal resistances for the electrolyte concentration, air electrode area, Mg electrode area and distance between the electrodes. It was confirmed that internal resistance is generated by the electrolyte, air electrode and metal electrode, then those Internal resistances had a significant effect on the power output decrease. The power output was a maximum when the load resistance maches the internal resistance of the magnesium fuel cell. The fuel efficiency was only 50% at maximum power output. Higher fuel efficiency was achieved when the load resistance is greater than the internal resistance.

Study on the fatigue Limit at Random Contact Loading (불규칙 접촉하중에서의 피로한도에 관한 연구)

  • Ok, Young-Gu;An, Deuk-Man;Cho, Yong-Ju;Lee, Hyun-Woo
    • Journal of the Korean Society for Precision Engineering
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    • v.19 no.8
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    • pp.84-91
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    • 2002
  • This paper analyzes the subsurface stress at the spherical contact using Hamilton equation, and with that data, calculates the fatigue limit under the variations of friction coefficient using fatigue theory. After rough surface being made, this paper figures out the random load generated by contacting to the rough surface, analyzes the stress of its subsurface, and calculates the fatigue limit of the rough surface using fatigue theory. The three parts of the fatigue theory are applied, which are critical plane theory, stress invariant theory and mesoscopic theory.

Improved Prediction of Lift-off Acoustic Loads for a Launch Vehicle (발사체 이륙 시 음향 하중 예측 정확도 향상)

  • Choi, Sang-Hyeon;Ih, Jeong-Guon;Lee, Ik-Jin
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2014.04a
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    • pp.207-210
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    • 2014
  • This paper is concerned with the prediction of lift-off acoustic loads for a launch vehicle. Intense acoustic load is generated when a launch vehicle is lifted off, and it can induce vibrations of a launch vehicle which cause damage or malfunction of a launch vehicle and a satellite. Lift-off acoustic loads of NARO are predicted by the modified Eldred's second method and the result is compared with the measured data in flight test. The prediction shows similar peak and shape of spectrum to the test data, but some discrepancy can be observed due to the predicted margin. In order to reduce such discrepancy, the sound pressure levels with four source distribution assumptions are calculated. Also, the surface diffraction effects are considered in the predict ion of lift-off acoustic loads, and the predicted result is more similar to the test data.

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The Basic Study on Unified Power Quality Conditioner (통합형 전력품질 개선장치에 관한 기초 연구)

  • Lee, Hyun-Ok;Oh, Sung-Chul;Rho, Dae-Seok
    • Proceedings of the KIEE Conference
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    • 2001.07b
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    • pp.1085-1087
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    • 2001
  • This paper deals with single-phase unified power quality conditioner, which aims at the integration of series-active and shunt-active tilter. The series filter is used to compensate for the voltage distortions and the shunt filter is used to provide reactive power and counteract the harmonic current injected by the load. Also, the voltage of the DC link capacitor is controlled to a desired value by the shunt active filter. In order to verify the performance of the proposed conditioner, computer simulations using MATLAB/SIMULINK were demonstrated. The results confirm that the proposed conditioner shows excellent performance to eliminate the harmonics and voltage flickers generated at the singe-phase nonlinear load.

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One-dimensional consolidation analysis of clayey soils based on elasto-viscous liquid model (탄점성압밀방정식을 이용한 점성토의 일차원 압밀 해석에 관한 연구)

  • 염혜선;김지용;정승용;김수삼
    • Proceedings of the Korean Geotechical Society Conference
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    • 2000.11a
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    • pp.689-694
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    • 2000
  • The traditional concept after Terzaghi was that consolidation was the dissipation process of pore water pressure compatible to external loading which was generated immediately after the loading. However, a theory of one-dimensional consolidation based on elasto-viscous liquid model proposed by Yoshikuni(1994) explained that the process of primary and secondary consolidation was considered to be not a simple process of dissipation of pore water pressure but a simultaneous process of dissipation and generation by external loading. This study attempts to demonstrate general consolidation behaviour of clayey soils including effects of consolidation history, load increment and thickness of cohesive layer by one-dimensional Finite Difference Method(F.D.M) analysis from the viewpoint of elasto-viscous consolidation theory.

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Field Testing of Distribution Line Carrier Communication System for Automation Distribution System (배전자동화용 배전선 반송통신방식의 전송특성시험)

  • Huh, Young;Oh, Won-Rock;Oh, Sang-Ki;Kim, Kwan-Ho;Kim, Yo-Hee;Hyun, Duck-Wha
    • Proceedings of the KIEE Conference
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    • 1989.07a
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    • pp.712-717
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    • 1989
  • A communication system through distribution lines was developed for distribution automation. Since all facilities in distrbution systems are connected by distribution lines, economical communication systems can be realized by using these lines as data transmission lines. But it has a problem in transmission reliability bcause of its sensitivity to noise and impeadance. Therefore, to cope with this problem. measurement and analysis of the communication characteristics are made according to the influence of load impeadence change, signal level and noise generated in load. Field tests were carried out at Kyung Ki branch of the KEPCO for half year starting in Feburary 1988.

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Analysis on Characteristics of Transmission Loss using Marginal Loss Factors Based on the KEPCO's Expected Peak Load Data of Year 2000 (한계손실계수에 의한 한전 예상첨두계통 송전손실 특성 분석)

  • NamKung, Jae-Yong;Choe, Heung-Gwan;Mun, Yeong-Hwan;O, Tae-Gyu;Im, Seong-Hwang;Han, Yong-Hui
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.50 no.7
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    • pp.333-339
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    • 2001
  • The transmission networks are not perfect conductors and a percentage of the power generated is therefore lost before it reaches the loads. This network loss effects to the cost of suppling power to consumers, and must be considered if the most efficient dispatch and location of generators and loads is to be achieved. In this paper, we propose an approximate calculation of marginal loss factors to analyze characteristics of transmission loss of KEPCO power system. These static marginal loss factors are approximately calculated based on the KEPCO's expected summer peak load data of year 2000.

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Analysis on Characteristics of Regional Transmission Loss based on the KEPCO's Peak Load Data of Year 2000 (2000년 하계 첨두시의 지역별 송전손실 특성분석)

  • NamKung, J.Y.;Choi, H.K.;Moon, Y.H.;Rim, S.H.;Han, Y.H.
    • Proceedings of the KIEE Conference
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    • 2000.11a
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    • pp.20-22
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    • 2000
  • The transmission networks are not perfect conductors and a percentage of the power generated is therefore lost before it reaches the loads. This network loss contributes to the cost of suppling power to consumers, and must be considered if the most efficient dispatch and location of generators and loads is to be achieved. In this paper, we propose an approximate calculation of marginal loss factors to analyze characteristics of regional transmission loss. These static marginal loss factors are approximately calculated based on the KEPCO's expected summer peak load data of year 2000.

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