Bifurcation Analysis of Subsynchronous Oscillations in DFIG Wind Farms

GUSTAVO REVEL; ANDRES E. LEON; DIEGO M. ALONSO; JORGE L. MOIOLA

Hong Kong

Simposio; International Symposium on Nonlinear Theory and its Applications. NOLTA'15; 2015

This work studies the dynamics associated to subsynchronous interactions between wind farms and series compensated ac transmission systems. This interaction originates large amplitude oscillations, which drives the system to the instability and may also produce a severe damage to the equipment. The analysis is based on bifurcation theory and it is carried out using continuation tools, in order to determine the role that typical parameters (e.g., the compensation level and the wind speed) have on the phenomenon. The bifurcation study reveals that the underlying mechanism associated with the appearance of subsynchronous oscillations can be explained by means of Hopf bifurcations of the equilibrium point and their corresponding limit cycles.