脱調予測のための状態推移図を用いた電力相差角曲線上の運転点の追跡法

概要

論文の詳細を見る
A fault that occurs in a power system will cause loss of synchronism between two groups of generators and may result in a wide area blackout. A modified method is proposed to predict the loss of synchronism. The method uses power, current and voltage measured on a line that is linking two sub-networks to which groups of generators swinging coherently are connected. A state diagram is used to estimate a region and a direction of movement on the power angle curve where the operating point of the power system exists. The state diagram is defined as follows. First, the power angle curve is separated into several regions such as a region on the left side of the curve, a region between a point where power becomes the maximum and the unstable equilibrium point that is termed UEP on the right side of the curve and so on. Second, the state diagram is defined that represents the regions and the moving directions of the operating point on the curve where an operating point exists. Then, by using the state diagram and the measured values of power, current and voltage, an operating point can be traced on the curve and loss of synchronism will be predicted by detecting that the operating point exceeds UEP. The East 10 model of IEEJ was used for verification of this method. Several simulations were studied including cases of loss of synchronism after multiple swings.
社団法人電気学会の論文
2009-08-01