06099 Effects of dynamic load model parameters on damping of oscillations in power systems

06099 Effects of dynamic load model parameters on damping of oscillations in power systems

06 Electric power generation and utilisation (scientific, technical) 95106099 Effects of dynamic load model parameters on damplng of osclllatlons ...

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06

Electric power generation

and utilisation (scientific, technical)

95106099

Effects of dynamic load model parameters on damplng of osclllatlons In power systems Milanovic, J. V. and Hiskens, I. A. Electric Power Sysrems Res., Apr. 1995, 33, (l), 53-61. The paper discusses the effects that nonlinear dynamic load model parameters haie on electromechanical oscillations in power systems. Based on a modified Heffron-Phillips model of a synchronous machine and on a generic model of dynamic loads, analysis shows the dependence of the modal oscillations of the system on load model parameters. A singlemachine infinite-bus case has been analyzed. It was found that under some circumstances damping can be improved, but under other conditions dynamic load may cause a decrease in damping.

Fuel efflclency concept for a dual-purpose power :E107 haheshwari, G. P. and Al-Ramadhan, M.

Systems, 1995, 17, (4), 247-250.

Electrical Power & Energy

A mohfied heat rate concept to evaluate the performance of dual-purpose power plants (DPPP) is proposed. This concept is specifically developed for co-generation wer- plants that employ ihermai steam iurbines and multi-stage flash 8” esalination units to produce electricity and water. The conventional heat rate concept. normallv used to assess the wrformance of single-purpose electric powhr plants, is iound to be unsuitable for cogeneration power plants. Alternatively, the proposed concept combines the two types of output to provide a single realisic indicator of the DPPP performance. The results of the analysis are finally applied to evaluate the performance of a power station in Kuwait.

95106100

Electric railway tractlon. Part 4. Slgnalllng and Interlocklngs Hill, R. J. Power Engng., Aug. 1995, 9, (4), 201-206. The article describes the theory and implementation of two basic railway control systems which are necessary to ensure safe and reliable operation of the complete network. 95/06101 Embedded generatlon (Tutorial) Jenkins. N. Power Ennineerinn .I.. Jun. 1995. 9. (3). 145-150. In this first of two tuto;ial articles. dealing with ‘the’iechnical aspects of generation embedded in distribution networks, generators with a rating of UP to 10 MW and a connection voltage of 33 kV or below are considered. The second article will consider some-practical aspects of connecting small generating plant to distribution networks. European train protection system for cross-border 95106102 railway operatlon Eschetmann, B. and Forsgran, K. ABE Review, 1995, (8), 17-22. Discusses the many different railway signalling systems which are currently in use in Europe. A major obstacle to cross-border traffic is the incompatibility of the national train protection systems. Locomotives for international mutes either have to be changed at the border or must be furnished with multiple national train protection systems. European railways and the railway signalling industry are therefore working together on a standardized train protection and control s stem that can be used across Europe. As the developer and supplier of E t; ICAB, the most widely used intermittent train protection and control system in the world, ABB has the core competencies and technologies on which the future European standard will be based. Evaluation of generatlon system reliability Indices 95106103 by fast transform techniques Laa;hgm7i, S. R. et al., Electrical Power & Energy Systems, 1995, 17, (4), Two computationally efficient Fourier transform methods namely, the mixed radix Fast Fourier transform algorithm (FFTA) and the Winograd Fourier transform algorithm (WRA) for evaluating the reliability of a power system are presented in this paper. Both the methods are used to evaluate the reliability of the IEEE reliability test system and they are compared with the direct discrete Fourier transform method and the basic recuisive approach in terms of accuracy and computer time. A sensitivity analysis has been performed by variation of a few system variables to compare the two methods. 95106104 Extending a stabilizer design method lo multlmachine power systems Yang,T. C. Electrical Power & Energy Systems, 1995, 17, (4), 275-280. In this paper, a power system stabilizer design method for single machine systems is extended to multi-machine systems. This based on: (1) pseudo global system models introduced in this paper; (2) frequency response based model order reduction technique; and (3) the pole assignment algorithm for single-input multi-output control systems presented in reference 1. The new design method is also applied to a practical ten-machine power system. 95106106 Flndlng and managlng phantom parasitic lnverter loads. Part 2 McCray, M. Solar Today, Sep.&t. 1995, 9, (S), 18, 38. In the last issue of SOLAR TODAY, the author described the concept of parasitic phantom electrical loads and how they ‘drain’ power from your PV system wihtout doing useful work. In this column he presents a list of these loads that PV homeowners discovered. This list should help identify the majority of devices that can be parasitic. 95106106 Flicker control using rule based modulated passive power filters Sharaf, A. M. and Huang, H. Electric Power Systems Res., Apr. 1995,33, (l), 49-52. The paper presents a novel modulated passive power filter scheme for nonlinear load bus voltage flicker control using an error-driven, errorscaled rule based controller for online voltage stabilization.

432

Fuel and Enerav Abstracts November 1995

95106106 Fuel for thought Thorogood, K. S. Power Ennineerinn J., Jun. 1995. 9, (31, 125-132. Disc&es how fuel cells are reaching the stage in thei; m&&y where they can no longer be regarded as a superficial source of major electrical power; their developers, in turn, must also recognise that interfacing them with versatile energy fuels is crucial to their wide acceptance. 95106109 Generic algorithm to select bulldlng-llghtlng technologles for mlnlmlzlng total harmonic dlstortlon Choudhry,M. A. and Rahman, S. Energy, Oct. 1995, 20, (lo), 1027-1036. The proliferation of nonlinear loads has raised new concerns about the power quality in commercial buildings. Higher cost of repair, and the reduction of average life of equipment, both on the supply and demand sides, as a result of poor power quality cannot be overlooked or ignored. As lighting loads are the largest fraction of the load in most commercial buildings, a small increase in their harmonic distortion levels may jeopardize the other loads in the building or loads connected to the same utility bus. In this paper, the authors present a generic algorithm to select energyefficient lighting technologies that will minimize harmonic distortIon levels in a building. Results from the algorithm are validated on a buildingload model to test its accuracy. 95106110 east

Grld tralnlng draws network operators from the

Modern Power Sysfems, Au . 1995, 15, (8), 39, 41, 43. Describes the U.K. National 8.rid Company’s Despatch Traning Simulator, which is currently located in one of the company’s control centres near St. Albans in Hertfonhire. NGC operator training courses based on the use of the simulator instituted in 1993 are now bein offered to utilities around the world. Two teams of operating managers % rom the Power Grid Corporation in India have recently completed intensive training courses on the simulator.

95106111 A hybrld artlflclal neural network-dlfferentlal dynamic programming approach for short-term hydro scheduling Lian , R. H. and Hsu, Y. Y. Electric Power Systems Res., May 1995,33, (2), 97-86. In this paper, a hybrid artifical neural network-differential dynamic programming (ANN-DDP) method for the scheduling of short-term hydro generation is developed. The purpose of short-term hydro scheduling is to find the optimal amounts of generated powers for the hydro units in the system for the next N (N=24 in this work) hours in the future. In the proposed method, the DDP procedures are performed offline on historical load data. The results are cornoiled and valuable information is obtained bv using ANN algorithms. The’ DDP algorithm is then performed onlink according to the obtained information to give the hydro generation schedule for the forecasted load. 95106112 lmplementatlon of enhanced network sensltlvltles In rule based systems for line flow security analyrlccese studles for a practical power system Hong, Y. Y. Electric Power Systems Res., May 1995, 33, (2), 119-124. The paper presents the use of neiwork sensitivity-factors for aieviating line overflow. The network sensitivity factors are enhanced to consider multiple circuits between two adjacent buses. Associated with the sensitivities, a rule based system is presented for correcting the line overload after a contingency occurs. The accuracy of the sensitivities, selection of the swing bus and impact of multigenerators at a common bus are discussed. The IEEE 30-bus system and a practical 265-bus system in Taiwan are used as samples to-show the applicability of the Nie based system proposed in this paper. 95106113 LQ electrlcal deslgn takes fast track Sales,G. and Stephen, D. offshore Engineer, Aug. 1995, 72, 74. Consafe converted to computer-aided design prior to tackling a series of design and build contracts

associated

with Shell Expro’s Brent field devel-

opm&t. Discusses the lessons learnt and saving made by the conversion. 95106114 Magneto-hydro-dynamic electrical power generation Messerle, H. K. John Wiley & Sons Ltd., Distribution Centre, 1 Oldlands Way, Bognor Regis, West Sussex, PO22 9SA, UK, f24.95, 1995, I91 pp.