Electrical Load-Curve Coverage. Proceedings of the Symposium by Robert Maxwell (Auth.)

By Robert Maxwell (Auth.)

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Additional resources for Electrical Load-Curve Coverage. Proceedings of the Symposium on Load-Curve Coverage in Future Electric Power Generating Systems, Organized by the Committee on Electric Power, United Nations Economic Commission for Europe, Rome, Italy, 24–28 October 1977

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Nous rappelons que nous avions publié en 1969 des études (15,16) qui traitaient l'optimisation d'un plan d'extension d'un réseau électrique devant toujours couvrir la demande en énergie et satisfaire en même temps une condition d'économie postulée. Nous basant sur l'expérience acquise dans ce domaine, nous allons généraliser le problème et étendre les calculs sur des systèmes comprenant des centrales combinées produisant simultanément électricité et chaleur. *Les chiffres entre parenthèses se réfèrent à la références.

D. Kochs and G. Traeder Figure 11 shows the required fast reserve, which is to be covered by spinning reserve, gas turbines and pumped-storage power plants as a function of different reliability levels Pdef· To guarantee an equal reliability level of Pdef = 10~ 3 the load dispatcher requires fast reserve equal to the size of the largest unit (in this example 630 MW) for a maximum duration of 3 hours. 8 h/a fast reserve being not covered by his own system; in order to satisfy the requirements he has to import reserve from other partners of the interconnected system.

Kochs and G. Traeder 34 load duration curve, load curve of the peak loads, load term expansion plan of the generating system, mean values of the operating and repair times, mean access-times of the power reserves. 1. Basio Mathematical Theory According to the basic technical model (Fig. 2) each unit is described by a twostate stochastic process using a two-stage reserve model (Fig. 3 ) . Thereby the mean access-time E(T% #) to the long-term reserve is equal to the necessary operation time Ε(Τ]ζ y) of the short-term reserve (fast reserve).

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