New Redundant Current Sharing Generator ExcitationSolution

摘要

This paper describes a redundant current sharing Generator Excitation System that can bernapplied to generator sizes from 1MW to over 1000MW. By splitting the excitation current loadrnbetween two current drivers, the health of each operating current driver is continuouslyrndiagnosed. Both current drivers contribute equally to provide very fast response to transientrnexcitation demands. The redundant architecture maintains stable control in the presence of anyrnsystem fault for superior reliability. Each current driver is sized for 100% duty so that if onerncurrent driver fails, the remaining current driver can pickup the load and stabilize the systemrnoutput in less than 15 milliseconds. The system includes a Triple Modular Redundant (TMR)rncontroller to integrate current driver management and generator control modes, features, andrnlimits. Repairing a fault does not require a scheduled shutdown since any faulted component canrnbe safely removed and replaced, even while the generator is operating at full load. The systemrnarchitecture allows calibration, tuning, and thorough system tests before starting the prime moverrnand also allows the user to fully exploit the generator’s capability while still observing thernmanufacturer’s operating limits.