Evaluation of Critical Clearing Time of Power System Equipped with a Static Synchronous Compensator

摘要

Problem statement: The critical clearing time provides very important role of the robustness in power system. The Static Synchronous Compensator (STATCOM) has been accepted to be equipped in modern power system. This study presents the method to evaluate the Critical Clearing Time (CCT) of the system equipped with a Static Synchronous Compensator (STATCOM). Approach: The parameter on STATCOM is modeled in energy function. The presented energy function is applied to determine CCT of the system. The verification of the proposed method is tested on sample system. Results: The maximum generator rotor angle of the faulted system without a STATCOM is continuously oscillation and the maximum value is much more than the system with a STATCOM. Conclusion: STATCOM based the proposed nonlinear control can damp power system oscillation. 【keyworks】Critical Clearing Time (CCT);power system stability;FACTS devices;Static Synchronous Compensator (STATCOM);Single Machine Infinite Bus (SMIB);energy function;voltage injection;voltage source;short circuit