• Title/Summary/Keyword: Transfer stability

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

  • Lee, Hyun-Chul;Park, Ji-Ho;Jyung, Tae-Young;Jeong, Ki-Seok;Lee, Sang-Duk;You, Hung-Sun;Baek, Young-Sik
    • Proceedings of the KIEE Conference
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    • 2011.07a
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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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A Study on Enhancing the Total Transfer Capability from a Voltage Stability Point of View Using SVC (SVC 적용에 의한 전압 안정도 측면에서의 융통전력 향상 방안에 대한 연구)

  • Lee, B.H.;Lee, S.J.;Kim, J.H.;Jang, K.H.;Kim, Y.H.;Kwak, N.H.;Ju, J.H.;Lee, J.L.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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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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A Study on Development of Power Transfer Capability Calculation Algorithm Considering Voltage Stability Margin (전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구)

  • Hong, S.E.;Kim, Y.H.;Lee, Buhm;Choi, S.K.;Jung, H.S.;Moon, H.K.;Lee, J.G.
    • Proceedings of the KIEE Conference
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    • 2002.07a
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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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A Study on Development of Power Transfer Capability Calculation Algorithm Considering the Closest Saddle Node Bifurcation for Voltage Stability (최단붕괴 전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구)

  • 김용하;정현성;나인규;조성린;이재걸
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.52 no.10
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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.

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

  • Lee, S.J.;Lee, B.H.;Kim, J.H.;Kim, Y.H.;Kwak, N.H.
    • Proceedings of the KIEE Conference
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    • 2002.11b
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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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A Study on Development of Power Transfer Capability Calculation Algorithm Considering A Closest Saddle Node Bifurcation For Voltage Stability (최단전압붕괴점 전압안정도여유를 고려한 수송능력산정 알고리즘의 개발에 관한 연구)

  • Kim, Y.H.;Lee, Buhm;Choi, S.K.;Jung, H.S.;Lee, S.J.;Jo, S.R.
    • Proceedings of the KIEE Conference
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    • 2002.11b
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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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Combustion Stability Analysis using Feedback Transfer Function (피드백 전달함수를 이용한 연소 안정성 해석)

  • Kim, Jina;Yoon, Myunggon;Kim, Daesik
    • Journal of the Korean Society of Combustion
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    • v.21 no.3
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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.

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

  • Lim, Hyun-Woo;Jang, Ho
    • Proceedings of the Korean Society of Tribologists and Lubrication Engineers Conference
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    • 2000.11a
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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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Effect of Si on Spatter Generation and Droplet Transfer Phenomena of MAG Wwlding (MAG 용접의 스패터 발생 및 용적이행현상에 미치는 Si의 영향)

  • 안영호;이종봉;엄동석
    • Journal of Welding and Joining
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    • v.17 no.3
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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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Development of Fuzzy Controller for Stabilizing the Arc State in Gas Metal Arc Welding (GMA 용접에 있어서 아크 안정화를 위한 퍼지제어기 개발에 관한 연구)

  • Kang, Moon-Jin;Lee, Se-Hun
    • Journal of the Korean Society for Precision Engineering
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    • v.16 no.12
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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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