Application Case: Oscillatory Stability Analysis of Type-4 Wind Power System

This chapter presents the time/frequency-domain modeling and stability analysis of sub/supersynchronous oscillation (S2SO) events in the Hami wind power system in Western China as an application case. The oscillatory stability analysis is carried out using the impedance network modeling-based quantitative analysis, frequency domain modal analysis, and RLC equivalent circuit-based analysis. Furthermore, a stability region analysis is performed to construct a stability region separating the operating points leading to a stable or unstable system. Finally, the source of the oscillation is also identified using field-measured data.