A Phase-plane Based Dynamic Coherency Real-time Identification Scheme for Controlled Islanding

Controlled islanding often acts as the last resort against a severe blackout. Generator coherency is the primary constraint to determine an effective controlled islanding strategy. This paper proposes a scheme to identify the dynamic coherency of generators for controlled islanding. The generator coherency is identified based on the Phase-plane Trajectory Vectors (PTVs) on the Phase Plane for Generators (PPG). Then a Phase Plane for Buses (PPB) is proposed to assign the non-generator buses to coherent generator groups following the minimum distance principle. The separated islands are formed by disconnecting certain transmission lines according to the identified coherent generators and areas. The case studies in IEEE 39-bus 10-machine power system show that the proposed scheme can not only adapt to different disturbances and changes of system conditions and network topology but also succeed in identifying the generator coherency at different times and developing proper islanding strategy according to current system states.

This is the peer reviewed version of the following article: Yang, S., Hojo, M. and Zhang, B. (2019), A phase‐plane‐based dynamic coherency real‐time identification scheme for controlled islanding. IEEJ Trans Elec Electron Eng, 14: 561-568., which has been published in final form at https://doi.org/10.1002/tee.22839. This article may be used for non-commercial purposes in accordance with Wiley Terms and Conditions for Use of Self-Archived Versions.