IP Library › Granted Patent US 6,933,705
Granted Patent B1
US 6,933,705 · App. 10/359,874 · Granted Aug 23, 2005

Generator stator voltage control through DC chopper

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Quick Facts
Patent No.
US 6,933,705
App. No.
10/359,874
Granted
Aug 23, 2005
Kind
B1
Abstract

A method and apparatus of stator voltage control for an induction generator. Each phase of the induction generator stator is connected through a secondary coil of a transformer to a utility grid. A stator voltage control circuit is connected in parallel with a primary coil of the transformer. The stator voltage control circuit consists of an on/off switch device connected to a full wave rectifier comprised of four silicon diodes. A single pulse width modulation (PWM) control is utilized to control the on/off switch devices of each phase of the induction generator stator.

Claims (16)

1. A method of induction generator stator voltage control for an induction generator comprising steps of:

A. Connecting at least one phase of said induction generator stator through a secondary coil of a transformer to a utility grid; and,

B. Modulating a stator voltage control circuit connected in parallel with a primary coil of said transformer;

said stator voltage control circuit consisting of an on/off switch device connected to a full wave rectifier comprised of four silicon diodes and a pulse width modulation connected to said on/off switch device.

2. A method of induction generator stator voltage control for an induction generator comprising steps of:

A. Providing a transformer for each phase of said induction generator stator;

B. Connecting each phase of said induction generator stator through a secondary coil of a respective transformer to a utility grid; and,

C. Modulating stator voltage control circuits connected in parallel with a primary coil of each respective transformer;

each of said stator voltage control circuits consisting of an on/off switch device connected to a full wave rectifier comprised of four silicon diodes and a pulse width modulation connected to said on/off switch device.

3. A induction generator stator voltage control apparatus for an induction generator comprising:

A transformer for each phase of said stator, each transformer having a primary coil and a secondary coil;

Each phase of said induction generator stator being connected through a secondary coil of a transformer for that phase to a utility grid;

A stator voltage control circuit for each phase of said stator, each stator voltage control circuit being connected in parallel with a respective primary coil of a transformer for that phase; and,

Said stator voltage control circuit consisting of an on/off switch device connected to a full wave rectifier comprised of four silicon diodes.

4. The apparatus of claim 3 further comprising:

A single pulse width modulation (PWM) control connected to said on/off switch devices of each phase of said induction generator stator.