• 제목/요약/키워드: Transfer stability

검색결과 951건 처리시간 0.039초

전력계통의 전압안정도 향상을 위한 변전소의 무효전력 제어 연구 (A Study of Reactive power control for voltage stability enhancement in power system)

  • 이현철;박지호;정태영;정기석;이상덕;유형선;백영식
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2011년도 제42회 하계학술대회
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    • pp.191-192
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    • 2011
  • The transmission capacity has been highlighted as a problem in the power company according to operated heavy loaded of transmission facility. The total transfer capability in the KEPCO power system is determined mainly by the voltage stability limit and many approaches for enhancement of the total transfer capability has been consistently performed. This paper proposes a study on determination of the adequate var sizing of power compensator regarding the transfer capability enhancement in power system. This method was controlled power compensator in substation becasue of the voltage stability. It was simulated power system using EMS peak data.

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SVC 적용에 의한 전압 안정도 측면에서의 융통전력 향상 방안에 대한 연구 (A Study on Enhancing the Total Transfer Capability from a Voltage Stability Point of View Using SVC)

  • 이병하;이세정;김정훈;장경철;김용학;곽노홍;추진부;이조련
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.90-92
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    • 2002
  • The SVC(Static Var Compensator) resulted from the FACTS technology can generate or absorb reactive power rapidly so as to increase the transient and voltage stability. In this paper, the SVC is applied to the power system in order to improve the total transfer capability from a viewpoint of static voltage stability and the effects of application of the SVC to the power system are analyzed. The IPLAN, which is a high level language used with PSS/E program, is employed for determining the total transfer capability.

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전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구 (A Study on Development of Power Transfer Capability Calculation Algorithm Considering Voltage Stability Margin)

  • 홍상은;김용하;이범;최상규;정현성;문혁기;이재걸
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 하계학술대회 논문집 A
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    • pp.19-21
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    • 2002
  • This paper presents a power transfer capability calculation algorithm Considering Voltage Stability Margin. In this method, voltage stability margin constraints are incorporated into a power transfer capability formulation to guarantee adequate voltage security levels in interconnected Power System. The proposed method is applied to IEEE-24 Reliability Test Systems and the results shows the effectiveness of the method.

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최단붕괴 전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구 (A Study on Development of Power Transfer Capability Calculation Algorithm Considering the Closest Saddle Node Bifurcation for Voltage Stability)

  • 김용하;정현성;나인규;조성린;이재걸
    • 대한전기학회논문지:전력기술부문A
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    • 제52권10호
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    • pp.557-562
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    • 2003
  • This paper presents a power transfer capability calculation algorithm considering the closest saddle node bifurcation for voltage stability margin. In this method, voltage stability margin constraints considering the closest saddle node bifurcation are incorporated into a power transfer capability formulation to guarantee adequate voltage security levels in an interconnected power system. The proposed method is applied to IEEE-24 reliability test system and the results show the effectiveness of the method.

IPLAN을 이용한 UPFC 적용 전력시스템의 전압 안정도 측면에서의 융통전력 향상 효과 분석 (A Study on Enhancing the Total Transfer Capability from Voltage Stability Point of View Using UPFC)

  • 이세정;이병하;김정훈;김용학;곽노홍
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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    • pp.151-153
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    • 2002
  • Using UPFC(Unified Power Flow Controlled), it is possible to control three parameters(voltage, impedance, and phase angle). The UPFC can generate or absorb reactive power rapidly so as to enhance the transient and voltage stability and also influence the power flow. In this paper, the effects of application of the UPFC to the power system are analyzed from a viewpoint of improving the total transfer capability by enhancing voltage stability. The IPLAN, which is a high level language used with PSS/E program, is employed for evaluating the total transfer capability from a f-V curve.

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최단전압붕괴점 전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구 (A Study on Development of Power Transfer Capability Calculation Algorithm Considering A Closest Saddle Node Bifurcation For Voltage Stability)

  • 김용하;이범;최상규;정현성;이성준;조성린
    • 대한전기학회:학술대회논문집
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    • 대한전기학회 2002년도 추계학술대회 논문집 전력기술부문
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    • pp.88-90
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    • 2002
  • This paper presents a power transfer capability calculation algorithm Considering A Closest Saddle Node Bifurcation For Voltage Stability Margin. In this method, voltage stability margin constraints considering a closest saddle node bifurcation are incorporated into a power transfer capability formulation to guarantee adequate voltage security levels in an interconnected Power System. The proposed method is applied to IEEE-24 Reliability Test System and the results shows the effectiveness of the method.

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피드백 전달함수를 이용한 연소 안정성 해석 (Combustion Stability Analysis using Feedback Transfer Function)

  • 김진아;윤명곤;김대식
    • 한국연소학회지
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    • 제21권3호
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    • pp.24-31
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    • 2016
  • In this paper we propose a new approach for an analysis and a prediction of combustion instability of lean premixed gas turbines. Our approach is based on the Nyquist stability criterion in control theory and a transfer function representation of a one-dimensional (1D) thermoacoustic system. A key advantage of the proposed approach is that one can systematically characterize the effects of various parameters of a combustor system on combustion instability. Our analysis method was applied to a real combustion system and the analysis results were consistent with experimental data.

고체윤활막 형상에 따른 마찰특성의 변화에 관한 연구 (A Study of Friction Characteristics according to the Morphology of Solid Transfer Film)

  • 임현우;장호
    • 한국윤활학회:학술대회논문집
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    • 한국윤활학회 2000년도 제32회 추계학술대회 정기총회
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    • pp.310-317
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    • 2000
  • Tribological properties of friction materials containing different volume ratios of solid lubricants (graphite and MoS$_2$) were studied using a pad-on-disk type friction tester. Morphology and thickness of the friction film were carefully examined to correlate the friction performance with the property of the friction film. Results showed that the friction materials containing 16vo1. % of graphite and 5 vol. % of MoS$_2$exhibited best friction stability among others. In particular, the thickness of the friction film decreased as the amount of MoS$_2$increased and severe friction oscillation was observed when the friction material contained MoS$_2$only (21 vol. %). Microscopic observations and friction tests suggested that the coherent thick transfer film improved the friction stability.

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MAG 용접의 스패터 발생 및 용적이행현상에 미치는 Si의 영향 (Effect of Si on Spatter Generation and Droplet Transfer Phenomena of MAG Wwlding)

  • 안영호;이종봉;엄동석
    • Journal of Welding and Joining
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    • 제17권3호
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    • pp.36-43
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    • 1999
  • The effect of Si content in welding wires on spattering characteristics and droplet transfer phenomena was studied. In MAG welding using 80% Ar-20% $CO_2$ shielding gas, spattering characteristics and droplet transfer phenomena were varied with Si content of wire. With increasing Si content, the spattering ratio and the ratio of large size spatter $(d\geq1.0mm)$ were increased. The increase of Si content in molten metal made surface tension increase due to reduction of oxygen content, which resulted from deoxidizing action of silicon. The increase of surface tension resulted in unstable transfer phenomena and arc instability in both short circuit and spray region. With changing Si content of wire, spattering characteristics and droplet transfer phenomena was directly influenced by the variation of surface tension, compared with the effect of arc stability.

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GMA 용접에 있어서 아크 안정화를 위한 퍼지제어기 개발에 관한 연구 (Development of Fuzzy Controller for Stabilizing the Arc State in Gas Metal Arc Welding)

  • 강문진;이세헌
    • 한국정밀공학회지
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    • 제16권12호
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    • pp.152-160
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    • 1999
  • The weld quality of $CO_2$ arc welding is closely related to the arc stability. As the characteristics of the arc are excessively complex and nonlinear, it is not easy to make the arc model as mathematical form and to control the arc state to be stabilized. This paper was aimed to estimate the arc stability and to control for stabilizing the arc state in short circuit metal transfer mode of $CO_2$ arc welding. For these purposes, the behaviors of arc stability was investigated at different welding conditions using Mita's arc stability index, and the fuzzy control algorithm which uses the arc stability index as control imput and the arc voltage as control output was developed. In the control of the arc stability, the experiments of two cases were performed; the case of setting an initial welding voltage arbitrarily, the case of the step change in workpiece shape. Obtained results were as follows; Mita's arc stability index was able to be estimated qualitatively in the case of using the inverter type welding power source and the control performance for stabilizing the arc status was excellent in the case of existing step change disturbance.

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