The reinforcement of power-system interconnections intensifies the need for stability studies. The growing complexity of the networks tremendously increases the difficulties of performing these investigations. Present computers are not capable of representing a major system pool in detail and producing a study in reasonable time and at reasonable cost. One possible solution is to reduce the size of the system by the use of equivalents to represent portions of the network beyond the area of immediate interest. Stability equivalents are not perfect, but their use offers the possibility of reducing the problem to manageable proportions.
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Brown et al. (1969) studied this question.
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