Certain exemplary embodiments can include a system comprising an electric drive system for a machine. The system can include a rectifier adapted to convert AC power from an alternator to DC power. The system can include an inverter adapted to receive DC power from the rectifier and provide power to a traction motor and/or auxiliary devices. Certain exemplary embodiments can include a system and method for dissipating excess energy from a machine.
CROSS-REFERENCES TO RELATED APPLICATIONS
This application claims priority to, and incorporates by reference herein in its entirety, pending U.S. Provisional Patent Application Ser. No. 60/574,958, filed 27 May 2004, pending U.S. Provisional Patent Application Ser. No. 60/574,959, filed 27 May 2004, and pending U.S. Provisional Patent Application Ser. No. 60/592,547, filed 30 Jul. 2004.
An excitation power converter of a doubly-fed generator is protected from excess current to be caused by ground fault or system disturbance and operation continuity of the power converter is ensured. In a power converter system, in order not to flow excess current generated in secondary windings of the doubly-fed generator into the power converter, a rectifier is connected in parallel to the power converter via a reactor, a DC link of the rectifier is connected to a DC link of the power converter, excess current flowing from the secondary windings is separately flowed at a reactor impedance ratio to reduce an amount of current flowing into the power converter, and a semiconductor switching element of an excess current generation arm of the power converter is set to an on-state.
