Electrical power systems and subsystems
An electrical power subsystem includes a generator comprising a generator stator and a generator rotor, and a power converter electrically coupled to the generator. The power converter includes a plurality of rotor-side converters electrically coupled in parallel, a line-side converter, and a regulated DC link electrically coupling the plurality of rotor-side converters and the line-side converter. The electrical power subsystem further includes a stator power path for providing power from the generator stator to the power grid, and a converter power path for providing power from the generator rotor through the power converter to the power grid.
1. An electrical power subsystem for connection to a power grid, the electrical power subsystem comprising:
a generator comprising a generator stator and a generator rotor;
a power converter electrically coupled to the generator, the power converter comprising:
a plurality of rotor-side converters electrically coupled in parallel;
a line-side converter; and
a regulated DC link electrically coupling the plurality of rotor-side converters and the line-side converter;
a stator power path for providing power from the generator stator to the power grid;
a converter power path for providing power from the generator rotor through the power converter to the power grid;
a plurality of inductors, each inductor coupled to the converter power path between the generator and one of the plurality of rotor-side converters, the plurality of inductors including a first inductor, a second inductor in parallel with the first inductor and magnetically coupled to the first inductor via a transformer, and a third inductor in series with the first and second inductors;
a partial power transformer provided on the converter power path; and
a harmonic filter coupled to the stator power path between the generator rotor and the power grid.
2. The electrical power subsystem of claim 1 , wherein the plurality of rotor-side converters comprises three or more rotor-side converters.
3. The electrical power subsystem of claim 1 , wherein the plurality of rotor-side converters consists of two rotor-side converters.
4. The electrical power subsystem of claim 1 , further comprising a controller coupled to the power converter, the controller configured to coordinate switching of the plurality of rotor-side converters to produce an interleaved switching pattern between the plurality of rotor-side converters.
5. The electrical power subsystem of claim 4 , wherein the phase of each of the plurality of rotor-side converters is shifted from others of the plurality of rotor-side converters by the result of 360 degrees divided by the total number of rotor-side converters, plus or minus 15 degrees.
6. An electrical power subsystem for connection to a power grid, the electrical power subsystem comprising:
a generator comprising a generator stator and a generator rotor;
a power converter electrically coupled to the generator, the power converter comprising:
a plurality of rotor-side converters electrically coupled in parallel;
a line-side converter; and
a regulated DC link electrically coupling the plurality of rotor-side converters and the line-side converter;
a stator power path for providing power from the generator stator to the power grid;
a converter power path for providing power from the generator rotor through the power converter to the power grid;
a plurality of inductors, each inductor coupled to the converter power path between the generator and one of the plurality of rotor-side converters, the plurality of inductors including a first inductor, a second inductor in parallel with the first inductor and magnetically coupled to the first inductor via a transformer, and a third inductor in series with the first and second inductors;
a harmonic filter coupled to the stator power path between the generator rotor and the power grid;
a partial power transformer connecting the subsystem to the power grid; and
a controller coupled to the power converter, the controller configured to coordinate switching of the plurality of rotor-side converters to produce an interleaved switching pattern between the plurality of rotor-side converters.
7. The electrical power subsystem of claim 6 , wherein the partial power transformer is provided on the converter power path.
8. The electrical power subsystem of claim 6 , wherein the plurality of rotor-side converters comprises three or more rotor-side converters.
9. The electrical power subsystem of claim 6 , wherein the plurality of rotor-side converters consists of two rotor-side converters.
10. The electrical power subsystem of claim 6 , wherein the phase of each of the plurality of rotor-side converters is shifted from others of the plurality of rotor-side converters by the result of 360 degrees divided by the total number of rotor-side converters, plus or minus 15 degrees.