Transient Stability Analysis Method of Synchronous Generator Based on Post-Fault Trajectories of Minimum Kinetic Energy

ZHANG Zhijun; LI Hui; CHEN Hongwen; GAN Jihong; LI Peng

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Electric Power Construction ›› 2013, Vol. 34 ›› Issue (5) : 6-10.

Transient Stability Analysis Method of Synchronous Generator Based on Post-Fault Trajectories of Minimum Kinetic Energy

ZHANG Zhijun1, LI Hui1, CHEN Hongwen1, GAN Jihong2, LI Peng2

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Abstract

In order to simply and accurately analyze the transient stability of synchronous generator (SG), combined the time domain simulation results, a hybrid evaluation method for critical clearing time (CCT) of SG is proposed according to the intersection of the two lines, which are the linear of fault clearing time and minimum kinetic energy after clearing fault when SG is stable or unstable, respectively. In the two cases of considering the SG models with damping and without damping, the CCT is calculated respectively by the hybrid evaluation method of transient stability, which is based on post-fault trajectories of the minimum kinetic energy, and the results are compared with the traditional post-fault trajectories method of minimum kinetic energy and the time domain simulation method. The comparison results show that the calculation accuracy of proposed hybrid method is better than the traditional post-fault trajectories method of minimum kinetic energy, and its calculation is simpler than the time domain simulation method.

Key words

power system / synchronous generator / transient stability / kinetic energy trajectory / critical clearing time

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ZHANG Zhijun, LI Hui, CHEN Hongwen, GAN Jihong, LI Peng. Transient Stability Analysis Method of Synchronous Generator Based on Post-Fault Trajectories of Minimum Kinetic Energy[J]. Electric Power Construction. 2013, 34(5): 6-10

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