Long-term power system dynamics analysis by time stamping on events sequence

A practical approach to long-term power system dynamics analysis should make a trade-off between result precision and time consumption. To address the time consuming issue of full scale numerical integration, an analysis method is proposed which tracks system evolving states interwoven by continuous dynamics and discrete events. Feasible operating states are solved by using temporal power flow (TPF) routines, which are convergent points of fast dynamics. TPF is driven by load growth that is embedded into the time horizon. Events are triggered and time stamped during the TPF routines, which involves OLTCs, exciter limiters and branch load encroachment, etc. Upon detecting instability or collapse, the routines are stopped. Simulation results on the New England 39-bus system verify the effectiveness of the proposed method.