Generator‐based threshold for transient stability assessment

• Published in: IET smart grid 2019-09, Vol.2 (3), p.407-419
• Main Authors: Isbeih, Younes J., El Moursi, Mohamed Shawky, Xiao, Weidong, El‐Saadany, Ehab
• Format: Article
• Language: English
• Subjects: 39-bus system; B8110C Power system control; B8310D Synchronous machines; C3340H Control of electric power systems; C7410B Power engineering computing; Clearing; conservative stability limits; considered contingencies; Contingency; critical clearing time; disturbances; Energy; fault location; fault locations; fault type; generator terminals; generator-based threshold; Generators; given contingency; individual generators; individual stability limit; load; loading condition; Methods; operating conditions; power system transient stability; power systems; pre-defined threshold; rotors; Sensitivity analysis; Simulation; specific loading level; stability; Stability analysis; Synchronism; synchronous generators; system operator; three-phase fault; Time synchronization; time-domain analysis; Transient stability; transient stability assessment; Transmission lines
• ISSN: 2515-2947; 2515-2947
• DOI: 10.1049/iet-stg.2018.0292

Power systems are frequently subjected to variations of the operating conditions due to the occurrence of contingencies such as faults, load or generator tripping. These disturbances might enforce the system to enter the instability region and thus deteriorate its overall performance. This paper proposes a systematic approach for transient stability assessment using generator‐based threshold. An individual stability limit is designed for each generator instead of using only one pre‐defined threshold for all generators. The considered contingencies are characterized by a fault type, location, loading condition and critical clearing time to consider wide range of operating conditions. Two fault locations are only considered to reduce the search space for stability limits; the generator terminals and mid of transmission lines. The critical clearing time is used to find the maximum relative rotor angle (MRRA) of individual generators attained during the entire time domain simulation. The MRRA of each generator represents the maximum angle which can be reached without losing synchronism at a given contingency. Conservative stability limits are drawn around the minimum stable drift of each generator which is chosen from the set of MRRAs of all contingencies. The effectiveness of the proposed approach is tested using the modified New‐England, 39‐bus system.