A hybrid approach of contingency screening for ATC assessment with stability constraints

Under deregulated environment, it is essential to accurately and efficiently evaluate transmission capability (ATC) for the effective use of transmission network. In Japan, because of the longitudinal structure of interconnected utility networks, the consideration of stability constraints in ATC assessment is crucial for the successful application of ATC assessment to Japanese interconnected networks. As evaluation of dynamic stability has large computational burden, an efficient contingency screening method is necessary for ATC assessment. In this paper, a novel approach of prescreening of contingency for ATC assessment with stability constraints is proposed. The proposed method utilizes a hybrid approach, which takes advantages of both energy function method and eigenvalue analysis. The proposed method can identify severest faults in maximum loading scenario in prior to the iterative process of ATC assessment with respect to supply/demand scenarios, so that large speed-up can be obtained by the application of proposed method to ATC assessment.