• Title/Summary/Keyword: Voltage Stability Analysis

Search Result 368, Processing Time 0.04 seconds

Jeju area's Voltage Stability Analysis which use the Real Time Voltage Stability Analysis Program (실시간 전압안정도 프로그램을 이용한 제주지역 전압안정도)

  • Lee, Sung-Woo;Ahn, Kyo-Sang;Seo, Dong-Wan;Jang, Moon-Jong
    • The Transactions of The Korean Institute of Electrical Engineers
    • /
    • v.61 no.10
    • /
    • pp.1387-1392
    • /
    • 2012
  • These days people use a lot of electric power, because industry advancement and a standard of living is elevated. So voltage stability analysis and control problems are very important in these days. U.S.A has already developed voltage stability analysis program, and use it on power transmission scheme such as generator overhaul, transmission line off and so on. So voltage stability analysis is more and more interested in Korea, too. In this paper, we introduce a standard theory of voltage stability analysis and real time voltage stability analysis program that use sPMU(Satellite Phasor Measurement Unit). And we also introduce the calculation result about voltage stability in Jeju power transmission system.

Hybrid Voltage Stability Analysis (혼합형 전압안정도 해석)

  • Kim, Won-Gyeom;Kim, Geon-Jung;Ju, Un-Pyo;Lee, Sang-Jung
    • The Transactions of the Korean Institute of Electrical Engineers A
    • /
    • v.49 no.2
    • /
    • pp.43-49
    • /
    • 2000
  • It is a complex process to analyze power system voltage stability problems with all of the dynamics of a system, because a large power network system sophisticatedly consists of generators, lines, loads and so forth. So we considered the dynamics of loads so as to analyze voltage stability method- by carrying out an analysis of steady state voltage stability and dynamic voltage stability simultaneously. To perform a steady state voltage stability program in advance makes it possible to cut down on laborious calculations so that an analysis of dynamic voltage stability becomes concise. The validity and efficiency of the method presented in this paper were verified by applying the IEEE 14 bus system.

  • PDF

A Study on Power System Voltage Stability Analysis by the Direct Lyapunov Function (Luapunov 직접법에 의한 전력계통 전압안정도 해석)

  • 문영현;박능수;이태식
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.43 no.5
    • /
    • pp.693-702
    • /
    • 1994
  • This paper deals with direct voltage stability analysis using a power system energy function. The structure preserved energy function is proposed as an energy function for voltage stability analysis. With the use of the proposed energy function voltage collapse conditions are derived, which yields the exactly same results with the Jacobian matrix approach. The voltage collapse phenomenon is analyzed by several methods, which shows that all of the methods produce the same voltage condition. This study also investigates the voltage collapse dynamics by using the proposed energy function. As a result, it has been found that the voltage collapse can be classified into two categories: static and dynamic instablilties which have quite different behaviors. In addition a new method is presented to calculate the power capacity limit of transmission lines with respect to voltage stability. The proposed method is tested for a 2-bus sample system, which shows the characteristics of voltage collapse phenomenon via the energy function.

Voltage Stability Analysis considering Static Voltage Dependent Load Model and Loss Redistribution (손실재분배와 정적전압의존형 부하모델을 고려한 전압안정도 해석)

  • Kim, K.S.;Chae, M.S.;Shin, J.R.;Lim, H.S.
    • Proceedings of the KIEE Conference
    • /
    • 1997.11a
    • /
    • pp.215-217
    • /
    • 1997
  • In many conventional analysis of voltage stability the effect of load characteristics is ignored. But in the real system the load is composed of various components. Therefore if the load composition could be modeled then it will plays an important role in the analysis of static voltage stability. And also, if the system loss generally imposed to slack bus in the conventional load flow calculation is redistributed to each generator the accuracy of static voltage stability analysis can be improved. This paper presents the effect of load composition in the analysis of system stability as well the loss redistribution algorithm. And this paper will compare the result of conventional method with that of the proposed method.

  • PDF

A Study on the identical basis of static voltage stability analysis methods in power systems (전력 계통 정적 전압 안정도 해석법의 동일 근거에 관한 연구)

  • Moon, Young-Hyun;Kim, Baik;Lee, Eung-Hyuk
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.45 no.4
    • /
    • pp.457-466
    • /
    • 1996
  • The Voltage stability problem has recently been dealt with in the literature from various points of view. The diverse theories have been established in voltage stability analysis because of the complicates of power systems and diverse phenomena of voltage collapse. Through rigorous mathematical operations, this paper shows that all the major methods used in static voltage stability, i.e - Jacobian method, voltage sensitivity method, real and reactive power loss sensitivity method and energy function method - have an identical background in theory. The results from the test in sample systems have shown the validity of this verification. (author). refs., figs., tabs.

  • PDF

Voltage Stability Analysis of AC/DC Systems (AC/DC 계통의 전압안정도 해석)

  • Nam, Hae-Kon;Kim, Yong-Hak
    • Proceedings of the KIEE Conference
    • /
    • 1995.11a
    • /
    • pp.89-91
    • /
    • 1995
  • This paper describes an extension or a pair or multiple load flow solutions and nose curve method developed for voltage stability analysis or AC power systems to AC/DC systems. In this approach the converters are regarded as voltage dependent loads. Assuming that the converters at the unstable (-mode) solution consume the same power equal to the power at the stable (+mode) solution, the unstable solutions or the nose curves arc determined. This method is very efficient since estimating voltage collapse point and voltage stability margin arc determined by a few iterations of multiple load flow solutions. Also the method has the advantages that since the structure or Jacobian matrix is same with that of AC load flow, modal analysis or voltage stability is readily applicable if desired.

  • PDF

Integrated Stability Analysis for Power Systems Using Energy Function (에너지함수에 의한 통합안정도해석)

  • Moon, Young-Hyun;Lee, Eung-Hyuk;Lee, Yoon-Seop;Oh, Yong-Taeg;Kim, Baik
    • Proceedings of the KIEE Conference
    • /
    • 1996.11a
    • /
    • pp.77-79
    • /
    • 1996
  • This paper presents an integrated stability analysis by the direct energy function method based on Equivalent Mechanical Model(EMM) which reflects the system behavior related to both angle and voltage stabilities. Actually, angle and voltage stability are intimately related in power system, so complete decoupling of these stability analysis is not possible in general, particularly in stressed power systems. In this paper, it is shown that a identical energy function can be used for angle and voltage stability analysis. The proposed energy function reflects the line resistances and reactive powers under the constraints of the same R/X ratio. The energy margin between UEP and SEP presents a good collapse proximity index in both types of stability analysis.

  • PDF

A Study on the Analysis and Control of Voltage Stability (전압안정성 분석 및 제어에 관한 연구)

  • 장수형;김규호;유석구
    • The Transactions of the Korean Institute of Electrical Engineers
    • /
    • v.43 no.6
    • /
    • pp.869-876
    • /
    • 1994
  • This paper presents an efficient method to calculate voltage collapse point and to avoid voltage instability. To evaluate voltage stability in power systems, it is necessary to get critical loading points. For this purpose, this paper uses linear programming to calculate efficiently voltage collapse point. Also, if index value becomes larger than given threshold value, voltage stability is improved by compensation of reactive power at selected bus. This algorithm is verified by simulation on the IEEE 14-bus sample system.

  • PDF

An Analytical Solution for Voltage Stability Studies Incorporating Wind Power

  • Lin, Yu-Zhang;Shi, Li-Bao;Yao, Liang-Zhong;Ni, Yi-Xin;Qin, Shi-Yao;Wang, Rui-Ming;Zhang, Jin-Ping
    • Journal of Electrical Engineering and Technology
    • /
    • v.10 no.3
    • /
    • pp.865-876
    • /
    • 2015
  • Voltage stability is one of the most critical security issues which has not yet been well resolved to date. In this paper, an analytical method called PQ plane analysis with consideration of the reactive power capability of wind turbine generator and the wake effect of wind farm is proposed for voltage stability study. Two voltage stability indices based on the proposed PQ plane analysis method incorporating the uncertainties of load-increasing direction and wind generation are designed and implemented. Cases studies are conducted to investigate the impacts of wind power incorporation with different control modes. Simulation results demonstrate that the constant voltage control based on reactive power capability significantly enhances voltage stability in comparison of the conventional constant power factor control. Some meaningful conclusions are obtained.

Object-Oriented Modeling for Implementing Voltage Stability Analysis Program (전압 안정도 해석 프로그램 개발을 위한 객체지향 모델링)

  • Gil, H.S.;Kim, J.H.;Shin, M.C.;Cho, I.S.;Kweon, M.H.;Lee, C.M.
    • Proceedings of the KIEE Conference
    • /
    • 2000.07a
    • /
    • pp.322-324
    • /
    • 2000
  • This paper introduces the concepts of UML(Unified Modeling Language) and the applying this technique for implementing voltage stability analysis program. Conventional function-oriented software development methodologies are inadequate to support further maintenance and enhancement. To overcome drawbacks of these methodologies, this paper proposes applying object-oriented technology for voltage stability evaluation software development. In this paper, a modal analysis approach, a steady-state voltage stability evaluation method, is used and UML is applied to the analysis and design for software development.

  • PDF