LFC調整残相互監視方式の開発

抄録

A major problem in the current LFC system lies in that its effectiveness cannot be checked. This is because it is very difficult to grasp the amount of the control residue of each area. For each area, the sum of the control residue, self regulation and the net power fluctuations through its tie-lines must be zero. Since fluctuations through the tie-lines are measurable, control residue or self regulation complement to each other. That is, the knowledge of either one makes the other known. For the central and western Japan 60 Hz system which consists of four interconnected systems, we obtain ten independent demand-supply balance equations with fourteen unknown variables. If it is assumed that control residues of different systems have no correlation to each other, six variables are eliminated, thus the balance equations become redundant.
This paper proposes an analysis method to resolve this contradiction, which is similar to recursive analysis. In other words, measured data are manipulated to extract as much information as possible and to enhance the assumption of the orthogonality among control residues of constituent systems. Furthermore, in order to cope with the case where the orthogonality assumption does not hold, a countermeasure has been incorporated to minimize the effect of violation of the assumption. At the same time, the method has a capability of checking the degree of correctness of the assumption to adopt or reject obtained analysis results and can be regarded as a very practical method.