A new methodology for the purpose of real-time local control of transient stability

Abstract

A new methodology is introduced solely for use in real-time local control of transient stability. The proposed method is based on localized transient stability of a power system. This is a completely new idea. In this method, the postfault power system is represented by a two-generator localized power system at the site of each individual generator. If each of these localized power systems reaches its stable equilibrium, then the power system reaches its stable equilibrium. Therefore, in terms of real-time local control of transient stability, if each of the localized power systems is driven to its respective stable equilibrium by local control actions with local computations using the locally measured data, then the power system is in stable equilibrium. Thus the method can be easily implemented for real-time local control of transient stability. This paper primarily focuses on the basic concepts of the method and presents some preliminary test results.Index Terms-localized power system, localized stability, realtime local control, transient stability.

Localized Transient Stability (LTS) Method for Real-time Localized Control

“…Therefore, in the proposed LTS method, the LPS trajectories can be used to assess transient stability of the full system in terms of critical clearing time (CCT). This has been discussed in [31]. However, as indicated earlier, the proposed method is not intended for transient stability assessment.…”

“…The method also provides dynamic equations for the remaining generators, which are necessary to design effective localized control strategies that can drive the power system to its appropriate equilibrium. Very recently, the proposed method was briefly introduced in [31]. However, in the present paper, the details of the mathematical formulations of the proposed method are presented.…”

Real-Time Localized Control of Transient Stability with Static Synchronous Series Compensator (SSSC)

“…This is also supported by the test results based on the comparison of Critical Clearing Time (CCT) by the LTS method with that by the SBS method. However, as discussed in [29], the LTS method is not at all intended for transient stability assessment. It is intended solely for the real-time localized control of transient stability.…”

“…if each LPS trajectory is stabilized by local control actions, then the full system is driven to its stable equilibrium. However, to apply the LTS method, as described in [29], it is essential that the local control actions (if any) at different generator sites are applied during the same time step such that there is no local control action present in the power system at the beginning of any particular time step. This is necessary to ensure that the post-fault power system returns to the original post-fault system at the beginning of any particular time step.…”

“…To overcome the drawbacks of localized control, a new methodology referred to as the Localized Transient Stability (LTS) Method [29]- [32] was very recently proposed solely for the purpose of real-time localized control of transient stability. However, the details of the mathematical formulations of the LTS method have been presented in [30].…”