Field excitation system and method for a wound rotor synchronous generator
AssigneeIndustrial Cooperation Foundation Chonbuk National University
InventorsYongsug SUH, Thomas LIPO
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Abstract
Provided is a driving system and method for a wound rotor synchronous generator. The driving system for a wound rotor synchronous generator according to the present invention includes: a converter controlling the wound rotor synchronous generator and receiving generated power; and a field winding power supply means supplying the power to a field winding of a rotor of the generator. The field winding power supply means is connected to the converter to receive the power from the converter and supply the power to the field winding, the power supplied to the field winding being electrically insulated from the power received from the converter.
Claims10
A driving system for a wound rotor synchronous generator, comprising:
- a converter controlling the wound rotor synchronous generator and receiving generated power;
- and
- a field winding power supply means supplying power to a field winding of a rotor of the generator,
- wherein the field winding power supply means is connected to the converter to receive the power from the converter and supply the power to the field winding, the power supplied to the field winding being electrically insulated from the power received from the converter, and
- wherein the converter includes:
- at least three switch legs each outputting a voltage at a plurality of levels and including a plurality of semiconductor switches,
- a plurality of diodes, and
- a capacitor module including at least one capacitor.
A method for controlling a converter, in a driving system for a wound rotor synchronous generator including a wound rotor synchronous generator, a field winding power supply means supplying power to a field winding of the generator using a rotary transformer, and the converter connected to a primary winding provided on a stator of the rotary transformer, the method comprising:
- by a control means of the converter,
- (a) setting a command value of a field current, which is a current flowing in the field winding of the generator, to a predetermined value;
- (b) measuring the field current;
- (c) calculating a first voltage command to be applied to the rotary transformer based on a control error that is a difference between the command value of the field current and the measured value of the field current;
- (d) generating a corrected second voltage command by correcting the first voltage command;
- (e) generating a pulse width modulation (PWM) control signal of a switch of a switch leg connected to the field winding power supply means based on the second voltage command;
- and
- (f) controlling the switch based on the PWM control signal.
Dependencies are inferred from the claim text.