Development of Trunk Transmission Online Integrated Stability Control System (ISC) for New Generation Grid

Abstract

Generally, if the power transmission lines are heavily loaded, the transient stability and frequency stability tend to be worse, and one power system fault may cause wide-area blackouts. However, restriction of the power flow sacrifices economical operations. To solve this problem, CEPCO (Chubu Electric Power Co., Inc. ) had implemented the Online Stability Control System.

Since current system was constructed more than 20 years ago, the situation of power system has drastically changed such as a large scale introduction of Distributed Energy Resource (DER) or increase of cross-regional power interchange. To cope with these changes, we are developing a new Stability Control System with new control functions. And, the new system integrates the current systems which were constructed separately for the purposes. As the result, the number of equipment was dramatically reduced.

This paper describes the outline of developing system and the new stability control functions to overcome various situational changes which have happened in CEPCO power grid.