Patent ID: 8106540

Claim:
A system for compensating a power transmission line, comprising: one or more non-conventional power generating sources, said one or more non-conventional power generating sources connected to said power transmission line; at least one series compensation circuit connected to at least a portion of said power transmission line; at least one damping circuit connected in parallel with said at least one series compensation circuit, the at least one damping circuit comprising at least one resistor connected in series with a parallel connected capacitor and inductor, the at least one damping circuit tuned to decrease subsynchronous resonance, the at least one resistor tuned to damp subsynchronous resonance, and the capacitor and inductor are tuned to block current in the at least one resistor at a synchronous frequency; wherein, said at least one damping circuit is tuned for a broadband response to subsynchronous series resonance and reduces subsynchronous series resonance caused by said at least one series compensation circuit on said power transmission line, and wherein said at least one series compensation circuit compensates said power transmission line.