General Methodology for Analysis of Sub-Synchronous Interaction in Wind Power Plants

Sub-synchronous interaction analysis between DFIG based wind farm and series compensated network

“…The two types of SSI have been analyzed in order to find the possible factors that influence currents oscillation and system stability. In [5]- [8], it is indicated that the cause of SSIGE in the DFIG based WF is similar to the one in conventional power generation systems When wind speed reduces or the SC level increases, the absolute value of the equivalent rotor resistance may exceed the sum of the stator resistance and network resistance at the electrical resonance frequency, and it will destabilize the system. The SSCI is an interaction between the generator controller of wind turbines and the series compensated transmission system [6], [9].…”

“…the eigenvalue analysis, the root locus method and the frequency scanning [3]- [5]. The SSI in the WF is different from traditional thermal power generation systems, what is usually excited by the subsynchronous torsional interaction and the shaft torque amplification, the sub-synchronous induction generator effect (SSIGE) and the sub-synchronous control interactions (SSCI).…”

“…The existing research shows that the possible sub-synchronous oscillation frequency under the SSCI is not fixed and can be in a wide frequency band above the slip frequency. The SSCI can build up very quickly and will cause severe damages [3], [5] if not effectively suppressed.…”

Multi-parameter bifurcation analysis of subsynchronous interactions in DFIG-based wind farms

“…5(c)], the cycle grazes the boundary 24 and t 2 = t 3 . On the other hand at the non-smooth saddle-node point NSN( i r ) for 90%, the cycle grazes the boundary 12 and t 1 = t 4 .…”

“…The problem was also analyzed using the Nyquist criterion on a derived impedance model in [10]. A procedure to study SSI in wind farms was presented in [11] and a general methodology was proposed in [12]. Mitigation strategies using dedicated controllers were analyzed in [6,[13][14][15][16][17][18], and using Flexible AC Transmission Systems (FACTS) in [19][20][21].…”