Energy storage system
The present disclosure is directed to an energy storage system including a power source and a power converter coupled to the power source. The power converter is configured to output power suitable for consumption in a utility grid. The energy storage system also includes an energy storage device configured to receive the power output from the power converter and a charge discharge converter coupled between the power converter and the energy storage device. The charge discharge converter is configured to control at least one of charging or discharging the energy storage device. Furthermore, the energy storage device includes a transformer coupled between the charge discharge converter and the power converter.
1. A wind turbine, comprising:
a rotor including a hub and at least one rotor blade extending from the hub;
a generator rotatably coupled to the rotor;
a grid side transformer coupled to the generator, the grid side transformer including a primary winding configured to be coupled to a utility grid, a secondary winding, and an auxiliary winding;
a power converter coupled to the generator, the power converter being configured to output power suitable for consumption in the utility grid;
a rotor side bus coupling the generator to the power converter;
a grid side bus coupling the power converter to the auxiliary winding of the grid side transformer;
a stator bus coupling the generator to the secondary winding of the grid side transformer, the stator bus being in parallel with the rotor side bus and the grid side bus;
an energy storage device configured to receive the power from the power converter, the energy storage device coupled to the grid side bus between the power converter and the auxiliary winding of the grid side transformer;
a charge discharge converter coupled between the power converter and the energy storage device, the charge discharge converter being configured to control at least one of charging or discharging the energy storage device; and,
an energy storage side transformer coupled between the charge discharge converter and the power converter, the energy storage side transformer coupled to the power converter via the grid side bus.
2. The wind turbine of claim 1 , wherein the power converter comprises a generator side AC-DC converter, a grid side DC-AC converter, and a DC link coupled between the generator side AC-DC converter and the grid side DC-AC converter, the energy storage side transformer being coupled between the grid side DC-AC converter and the energy storage device.
3. The wind turbine of claim 2 , further comprising:
a plurality of inductors coupled between the grid side DC-AC converter and the transformer.
4. The wind turbine of claim 1 , wherein the charge discharge converter corresponds to a bridge converter.
5. The wind turbine of claim 1 , wherein the charge discharge converter corresponds to a four quadrant charge discharge converter.
6. The wind turbine of claim 1 , wherein the charge discharge converter comprises a plurality of switching devices.
7. The wind turbine of claim 6 , wherein one or more of the plurality of switching devices correspond to an insulated-gate bipolar transistor.