Hybrid power generation system and an associated method thereof
A hybrid power generation system is presented. The system includes a first power generation subsystem including a prime mover driving a generator including a rotor and a stator, one or more first conversion units coupled to at least one of the rotor and the stator, a first direct current (DC) link, and one or more second conversion units coupled to a corresponding one or more first conversion units via the first DC link. The system includes one or more second power generation subsystems coupled to the first power generation subsystem and one or more power conversion subunits including one or more first bridge circuits coupled to a corresponding one or more second bridge circuits via one or more transformers, where at least one of the one or more second power generation subsystems and the first power generation subsystem includes the one or more power conversion subunits.
1. A hybrid power generation system comprising:
a wind based power generation subsystem, wherein the wind based power generation subsystem is coupled to a ground terminal and comprises:
a prime mover driving a doubly fed induction generator comprising a rotor and a stator;
one or more first conversion units coupled to at least one of the rotor and the stator;
a first direct current (DC) link;
a plurality of second conversion units directly coupled to a corresponding one or more first conversion units via the first DC link;
one or more DC source based power generation subsystems coupled to the first power generation subsystem via the first DC link, wherein each of the plurality of second conversion units correspond to separate alternating current phases;
a first transformer, wherein at least the stator and the one or more second conversion units are coupled to the first transformer;
a plurality of power conversion subunits comprising a plurality of first bridge circuits coupled to a corresponding one or more second bridge circuits via one or more corresponding transformers, wherein at least one of the one or more second power generation subsystems and the first power generation subsystem comprises the one or more power conversion subunits, and wherein the one or more power conversion subunits are configured to galvanically isolate the one or more DC source based power generation subsystems from the wind based power generation subsystem; and
wherein each of the plurality of second conversion units comprises a plurality of the power conversion subunits and the plurality of first bridge circuits are connected in parallel on a DC side of the plurality of second conversion units.
2. The hybrid power generation system of claim 1 , wherein the one or more DC source based power generation subsystem comprises at least one of one or more photovoltaic panels, one or more energy storage devices, and one or more other energy sources.
3. The hybrid power generation system of claim 1 , wherein the generator comprises a wind driven doubly fed induction generator.
4. The hybrid power generation system of claim 1 , wherein the one or more first bridge circuits comprise a first DC to alternating current (AC) converter and the one or more second bridge circuits comprise a first AC to DC converter.
5. The hybrid power generation system of claim 4 , wherein each of the one or more second conversion units further comprises one or more second DC to AC converters coupled to one another in a series connection.
6. The hybrid power generation system of claim 5 , wherein one of the one or more second DC to AC converters corresponding to each of the one or more second conversion units comprises a single AC phase terminal.
7. The hybrid power generation system of claim 6 , wherein another second DC to AC converter of the one or more second DC to AC converters corresponding to each of the one or more second conversion units comprises a neutral terminal.
8. The hybrid power generation system of claim 5 , wherein each of the one or more second DC to AC converters is coupled to corresponding one or more power conversion subunits via a second DC Link.
9. The hybrid power generation system of claim 8 , wherein the one or more second power generation subsystems are coupled to the second DC link.
10. The hybrid power generation system of claim 4 , wherein the one or more power conversion subunits corresponding to the one or more second power generation subsystems and the one or more second conversion units are coupled to the first DC link.
11. The hybrid power generation system of claim 4 , wherein each of the one or more first conversion units comprises one or more second AC to DC converters.
12. The hybrid power generation system of claim 1 , wherein each of the one or more first conversion units, the one or more second conversion units, and the one or more second power generation subsystems comprise one or more silicon carbide (SiC) switches.
13. The hybrid power generation system of claim 1 , wherein the one or more second power generation subsystems comprise a DC to DC converter.
14. A power system comprising:
an electrical grid;
a wind based power generation subsystem coupled to the electrical grid, wherein the wind based power generation subsystem is coupled to a ground terminal and comprises:
a wind driven doubly fed induction generator comprising a rotor and a stator; one or more first conversion units coupled to the rotor,
a first direct current (DC) link;
a plurality of second conversion units directly coupled to a corresponding one or more first conversion units via the first DC link;
one or more DC source based power generation subsystems coupled to the wind based power generation subsystem via the first DC link, wherein each of the plurality of second conversion units correspond to separate alternating current phases;
a first transformer, wherein at least the stator and the one or more second conversion units are coupled to the first transformer;
a plurality of power conversion subunits comprising a plurality of first bridge circuits coupled to a corresponding one or more second bridge circuits via one or more corresponding transformers, wherein at least one of the one or more DC source based power generation subsystems and the wind based power generation subsystem comprises the one or more power conversion subunits, and, wherein the one or more power conversion subunits are configured to galvanically isolate the one or more DC source based power generation subsystems from the wind based power generation subsystem; and
wherein each of the plurality of second conversion units comprises a plurality of the power conversion subunits and the plurality of first bridge circuits are connected in parallel on a DC side of the plurality of second conversion units.
15. The hybrid power generation system of claim 1 , wherein the one or more first conversion units are configured to operate in at least one of an interleaved mode of operation and a non-interleaved mode of operation.
16. The hybrid power generation system of claim 1 , wherein the one or more first conversion units are coupled to at least one of a rotor bus and a neutral terminal via corresponding inductors.