Mitigation of induction generator effect due to SSR with STATCOM in synchronous generator

Subsynchronous resonance

“…When self-excitation starts in a network, sub-synchronous electrical currents tend to increase rapidly [39]. SSR may reveal itself in the form of overvoltage as inductio n generator effect (lGE) in series compensated system [5], [9]. Therefore, there is always a possibility of SSR due to IGE even in hydro generators.…”

“…Therefore, there is always a possibility of SSR due to IGE even in hydro generators. [5], [9] stated that the IGE effect is only concerned when:…”

“…1. The magnitude of the equivalent rotor resistance viewed from the stator side of the generator is greater than the summation of the resistance of transformer and transmiss io n line [5], [14]. Or, 2.…”

“…The summation of the resistance of transformer and transmission line is less than the equivalent rotor resistance viewed from the stator side of the generator. In practical condition both these are possible but needs to be taken care to avoid the IGE during planning a new generating station with existing transmission line or new transmission line with existing generating station [5], [14].…”