支配微分方程式の推定法に基づく電源脱落量推定

抄録

This paper describes an estimation method of the amount of power drop after severe generation outage. When a large amount of generation outage occurs, the system frequency goes down to unacceptable frequency level. Frequency drop affects not only customers but generation systems unfavorably. So adequate and quick load-shedding must be carried out to prevent spreads of accidents. In order to perform the load-shedding policy effectively, the amount of the generation outage must be precisely estimated in the short time. So far, several methods have been proposed to estimate the power outage amount by means of the measurement of the decaying frequency variations which are obtained at each local bus. These methods are easily to apply but can not be expected to bring a good result in real power system operations because of noises included in decaying frequency variations.
In order to cope with this problem, a new estimation method based on an estimation method of dominating differential equation is proposed in this paper. For the improvement of the precision of the estimation, the supplementary informations such as a sine wave included in the decaying frequency deviations are incorporated in the equation.
Simulation studies on a model power system consisting of five generating stations and four load points show that the methods is encouraging.