Variable speed constant frequency system with generator and rotating power converter

摘要

An electric power generating system includes a brushless wound field synchronous generator with n-number of power generating channels and n-number of bidirectional switches alternatively controlled to provide ac power at the output. Each power generating channel includes a control rotating transformer, a rotating power converter supplying power to field winding from the rotating power supply, and a center-tap single phase armature winding connected to the bidirectional switches. Rotating power converter modulates current in the field winding to obtain desired frequency and phase at the system output.

主权项

1. A generator system comprising:
a generator having a stationary portion and a rotating portion, the generator comprising:
an exciter field winding disposed on the stationary portion;a rotating power supply comprising:
a three-phase exciter armature winding disposed on the rotating portion;a three-phase 6-pulse rectifier disposed on the rotating portion that converts AC power from the exciter armature winding into DC power;a DC capacitor disposed on the rotating portion;at least one generator channel, comprising:
a main field winding disposed on the rotating portion;a main field power converter disposed on the rotating portion that delivers power to the main field winding;a single phase armature winding disposed on the stationary portion to provide AC power at an output of the at least one generator channel;a control transformer primary winding disposed on the stationary portion;a control transformer secondary windings disposed on the rotating portion to electrically communicate with the control transformer primary winding;a set of gate drives that electrically communicate with the control transformer secondary winding, the set of gate drives disposed on the rotating portion that communicates with the main field power converter; at least one output channel in electrical communication with a respective at least one generator channel, the at least one output channel comprising:
first and second bidirectional switches;an output filter including a filter capacitor; andfirst and second interface inductors connected between the bidirectional switches and the output filter; and a control unit in electrical communication with the at least one output channel and a respective generator channel, the control unit configured to generate control signals based on an output voltage at the output and a capacitor filter current flowing through the filter capacitor.