1 research outputs found
Transient Stability Assessment of Cascade Tripping of Renewable Sources Using SOS
There has been significant increase in penetration of renewable generation
(RG) sources all over the world. Localized concentration of many such
generators could initiate a cascade tripping sequence that might threaten the
stability of the entire system. Understanding the impact of cascade tripping
process would help the system planner identify trip sequences that must be
blocked in order to increase stability. In this work, we attempt to understand
the consequences of cascade tripping mechanism through a Lyapunov approach. A
conservative definition for the stability region (SR) along with its estimation
for a given cascading sequence using sum of squares (SOS) programming is
proposed. Finally, a simple probabilistic definition of the SR is used to
visualize the risk of instability and understand the impact of blocking trip
sequences. A 3-machine system with significant RG penetration is used to
demonstrate the idea.Comment: To appear in PESGM 2018, Portland, OR, 201