The capabilities of the voltage stability security assessment (VSSAD) to assess proximity to and ranking voltage instability by (a) performing a contingency selection of each model determined subsystem and (b) diagnosing where, why, when and what can be done to cure voltage instability for each equipment outage and transaction combination is thoroughly documented in IEEE Trans, Power Syst. 13 (1998) 1423; Division of Engineering Research Technical Report December 1998, Santorini, Greece. This paper reviews these capabilities and how they can be used to implement a contingency selection module and security constrained optimization module for the open access system dispatch (OASYDIS) being proposed as part of the proposed transmission dispatch and congestion management (IEEE Trans. Power Syst. 13 (1998) 1466) in an ISO. The open access system dispatch can be implemented as either a preventive control as given in IEEE Trans. Power Syst. 13 (1998) 1466 or as a corrective control as proposed in this paper. The VSSAD based contingency selection can provide the security constraints for either a preventive or corrective control implementation of OASYDIS. The advantages of corrective control axe discussed and the changes in the proposed open access system dispatch (IEEE Trans. Power Syst. 13 (1998) 1466) required to implement a corrective control are discussed. (C) 2001 Elsevier Science B.V. All rights reserved.
