Security assessment by multiple transmission system operators exchanging sensitivity and tie-line power flow information

Abstract

Abstract-This paper considers a procedure for multi-area static security assessment of large interconnected power systems operated by a team of Transmission System Operators (TSOs). In this procedure, each TSO provides the other TSOs with his own equivalent model as well as the detailed effects of contingencies in his control area on all tie-line flows. The paper deals with the implementation of sensitivity-based equivalents suitable for static security assessment. Accuracy with respect to the unreduced model and computational efficiency are considered in evaluating the proposed approach. The relevance of the procedure in the context of recent UCTE operational security policy recommendations is also stressed. The procedure has been implemented in an AC power flow program and tested on a three-area variant of the IEEE 118-bus test system.

A Framework for Dynamic Security Assessment of Combined Multi-Terminal HVDC and AC Grids

“…There is an abundant literature dealing with the identification of external equivalents in all-AC systems (e.g. [9], [10] and their references). In the case of asynchronous AC systems coupled through an MTDC grid, it seems sufficient to account for the MTDC grid controls that alter the power transfers between AC areas.…”

Impact of external elements on the responsibility area of a Transmission System Operator using the influence factor method

“…Nowadays, each TSO is responsible for the security assessment of his own area, although a higher level of awareness and coordination among the TSO is required to improve the security of the whole interconnection [14]. The assessment of a system security is more and more interdependent due to the increase of interconnections among systems operators.…”