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1887

IEE Proceedings C (Generation, Transmission and Distribution)

Volume 134, Issue 3, May 1987

Volumes & issues:

Volume 134, Issue 3

May 1987

Capability chart for an HVDC link
Performance tests of a low-fault-level radial transmission system and comparison with computer simulations
Spectral decomposition of variations in electricity loading using mixed radix fast Fourier transform
  • Author(s): P.S. Bodger ; D.R.D. Brooks ; S.P. Moutter
  • Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 134, Issue 3, p. 197 –202
  • DOI:  10.1049/ip-c.1987.0029
  • Type: Article
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  • p. 197 –202 (6)
    A frequency-domain approach to forecasting is presented, which is suitable for time series that have harmonically related frequency components. It involves the use of a fast Fourier transform algorithm that calculates the frequency spectrum of a discrete set of data points whose array size is not restricted to the set 2m, where m is an integer. The high resolution of the spectra obtained for New Zealand Electricity short- and medium-term data enables the true components present in the time-domain waveforms to be accurately identified. A modified time-domain waveform by inverse transforming is then determined, which (containing only the true harmonic components) can be extrapolated to yield a forecast.
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On the performance of the super-decoupled technique
Erratum: Load-curtailment model for economic loading of thermal generation
Erratum: Discrete vairable structure controller for load frequency control of multiarea interconnected power systems
Erratum: Describing function applied to HVDC systems harmonic instability
Real-time power system simulation
  • Author(s): M. Rafian ; M.J.H. Sterling ; M.R. Irving
  • Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 134, Issue 3, p. 206 –223
  • DOI:  10.1049/ip-c.1987.0034
  • Type: Article
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  • p. 206 –223 (18)
    This paper describes the theoretical basis and application of a simulation package for electrical generation, transmission and distribution systems. The software provides an environment for the development and testing of online analysis and control algorithms, and also has potential for application in operator training. Dynamic and algebraic models of power system elements are described which are appropriate for study time scales of up to one day. Numerical techniques are presented which obtain solutions with acceptable accuracy in real time for medium sized networks using minicomputer hardware. Typical results are given for a test network of 30 substations which illustrate the dynamic behaviour of the network under emergency conditions.
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Reliability equivalents in composite system reliability evaluation
  • Author(s): R. Billinton ; H.J. Koglin ; E. Roos
  • Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 134, Issue 3, p. 224 –232
  • DOI:  10.1049/ip-c.1987.0035
  • Type: Article
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  • p. 224 –232 (9)
    The concept of utilising equivalents in the evaluation of large power systems, where sensitivity studies are to be done or the impact of a further interconnected system is to be examined, is a very powerful and useful tool. The paper illustrates a technique for developing reliability equivalent models for power systems or for parts of power systems. A second technique is presented, which shows how to include these equivalents in further composite reliability studies. Several examples demonstrate the application of these new techniques by carrying out sensitivity studies and interconnected-system reliability evaluations. The advantages of the new method are illustrated.
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Determination of transient stability regions in state space using local Lyapunov surfaces
Identification of optimum location for stabiliser applications using participation factors
Saturated reactor compensator model. Electromagnetic transient formulation for main- and auxiliary-core winding systems
  • Author(s): W. Derek Humpage  and  T.T. Nguyen
  • Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 134, Issue 3, p. 245 –255
  • DOI:  10.1049/ip-c.1987.0038
  • Type: Article
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  • p. 245 –255 (11)
    The paper develops a particularly direct form of model for reactive-power compensators that are based on saturated reactors. It is one in which each winding section of each limb of the main- and auxiliary-core structures is represented individually together with its core nonlinear magnetic-circuit characteristics. Depending on the precise internal configuration, there may be 30-50 individual winding sections. The complete model is of a transient form, and it is shown in the paper how it may be combined with a powerful z-plane electromagnetic transient formulation for network systems in which a saturated reactor compensator is one element. As it is in general form, the compensator model makes provision for representing the particular main- and auxiliary-core systems of any given design such as those of the twin tripler and triple tripler compensators. Particular cases are selected by data items. Both the model itself and its programming implementation are completely general. The validity of the model developed is examined on the basis of comparisons between computer-simulation solutions and sitetest recordings of the main compensator variables following the energisation of a compensatorterminated line section. In one particular aspect of the correlation, computer simulation reproduces closely the subharmonic oscillations arising from the slope-correcting capacitors and the complex saturating magnetic system of a twin tripler compensator.
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Adaptive controller for static reactive-power compensators in power systems
  • Author(s): P.K. Dash ; P.C. Panda ; A.M. Sharaf ; E.F. Hill
  • Source: IEE Proceedings C (Generation, Transmission and Distribution), Volume 134, Issue 3, p. 256 –264
  • DOI:  10.1049/ip-c.1987.0039
  • Type: Article
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  • p. 256 –264 (9)
    The paper presents a comparison of the admittance models for static reactive-power compensators along with a microcomputer-based digital model for power-system dynamic-performance improvement. Emphasis is placed on stability, and it is shown that static reactive-power (VAr) controllers (SVCs) can provide significant benefits in terms of increased transient stability limits and improved damping in terms of synchronising power-flow oscillations. Further introduction of a simplified self tuner for the SVC can dramatically increase the power-system performance under a variety of abnormal operating conditions, such as 3-phase short circuits, load shedding, reactance switching, pole slipping and resynchronisation conditions. The self-tuning digital control for the SVC can be easily implemented on a microcomputer. Simulation results for a sample power system using an LSI-11/23 microcomputer are presented in the paper.
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