Importance

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Abstract

A method for modifying an area control error signal for controlling the generation in each area of a multiple-area interconnected electric power system using net-interchange tie-line bias control where the area control error is calculated in accordance with the equation ACE=.DELTA.P.sub.t1 -10B.times..DELTA.f where .DELTA.P.sub.t1 is the deviation of the measured net interchange from its scheduled value, .DELTA.f is the deviation of a system frequency from its set value, and B is the frequency bias of the area. The modification involves the integration of .DELTA.P.sub.t1 to produce a signal representing a measured value of the inadvertent interchange II'.sub.t1, and integration of .DELTA.f to produce a signal representing the time deviation TD'. The time deviation is multiplied by the value 10Bf.sub.o /3600 times 1/T where B is the area frequency bias and 1/T is the control weighting factor. The product of the multiplication is subtracted from the signal II'.sub.t1 and added to the area control error ACE to provide an error signal for correcting for inadvertent interchange and time deviation as well as for load changes. The integration of .DELTA.P.sub.t1 and .DELTA.f are periodically updated from accurate measurements of inadvertent interchange and time deviation.

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