System and method for operating a power generation system within a power storage/discharge mode or a dynamic brake mode
View Patent ↗In one aspect, a system for operating a power generation system within a battery storage/discharge mode or a dynamic brake mode may generally include a power convertor having a DC link, a switching module coupled to the DC link and a selector switch configured to selectively couple the switching module to one of a storage device or a resistive element of the power generation system. The selector switch may be movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.
1. A system for operating a power generation system within a battery storage/discharge mode or a dynamic brake mode, the system comprising:
a power convertor including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
a selector switch coupled to the DC link; and
a switching module coupled between the selector switch and the DC link, the selector switch being configured to selectively couple the switching module to one of a storage device or a resistive element of the power generation system,
wherein the selector switch is movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.
2. The system of claim 1 , further comprising a plurality of switching modules coupled between the selector switch and the DC link, wherein, when the selector switch is in the first position, the plurality of switching modules are configured to be operated as a bi-directional DC-to-DC converter for controlling the flow of power to and from the storage device.
3. The system of claim 1 , wherein, when the selector switch is in the first position, the switching module is configured to be operated as a DC-to-DC converter for controlling the flow of power from the DC link to the storage device.
4. The system of claim 1 , wherein, when the selector switch is in the second position, the switching module is configured to be operated as a brake chopper for the resistive element.
5. The system of claim 1 , wherein the switching module comprises a switching element coupled between the DC link and the selector switch and a diode associated with the switching element.
6. The system of claim 1 , wherein the storage device comprises at least one battery.
7. The system of claim 1 , further comprising a filter associated with the storage device.
8. A method for operating a power generation system within a battery storage/discharge mode or a dynamic brake mode, the method comprising:
operating a power converter of the power generation system, the power converter including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
selectively coupling, via a switching switch, a switching module to one of a storage device or a resistive element of the power generation system, the switching module being coupled to between the switching element and the DC link; and
controlling the switching module in order to regulate a flow of power between the DC link and the one of the storage device or the resistive element.
9. The method of claim 8 , wherein selectively coupling the switching module to one of the storage device or the resistive element comprises moving the selector switch to a first position in order to couple the switching module to the storage device.
10. The method of claim 9 , wherein controlling the switching module in order to regulate the flow of power between the DC link and the one of the storage device or the resistive element comprises controlling the switching module in a manner that either directs power from the DC link to the storage device or from the storage device to the DC link.
11. The method of claim 8 , wherein selectively coupling the switching module to one of the storage device or the resistive element comprises moving the selector switch to a second position in order to couple the switching module to the resistive element.
12. The method of claim 11 , wherein controlling the switching module in order to regulate the flow of power between the DC link and the one of the storage device or the resistive element comprises controlling the switching module in a manner that directs power from the DC link to the resistive element.
13. A wind turbine system, comprising:
a wind-driven generator;
a power convertor coupled to the wind-driven generator, the power convertor including a rotor side converter, a line side converter and a DC link coupled between the rotor side and line side converters, the rotor side converter being configured to convert AC power to DC power and the line side converter being configured to convert DC power to AC power;
a selector switch coupled to the DC link; and
a switching module coupled to between the selector switch and the DC link, the switching module, when controlled, being configured to draw power from or transmit power to the DC link, the selector switch being configured to selectively couple the switching module to one of a storage device or a resistive element of the wind turbine system,
wherein the selector switch is movable between a first position, wherein the switching module is coupled to the storage device such that power is capable of being directed between the DC link and the storage device via control of the switching module, and a second position, wherein the switching module is coupled to the resistive element such that power is capable of being directed between the DC link and the resistive element via control of the switching module.
14. The wind turbine system of claim 13 , further comprising a plurality of switching modules coupled to between the selector switch and the DC link, wherein, when the selector switch is in the first position, the plurality of switching modules are configured to be operated as a bi-directional DC-to-DC converter for controlling the flow of power to and from the storage device.
15. The wind turbine system of claim 13 , wherein, when the selector switch is in the first position, the switching module is configured to be operated as a DC-to-DC converter for controlling the flow of power from the DC link to the storage device.
16. The wind turbine system of claim 13 , wherein, when the selector switch is in the second position, the switching module is configured to be operated as a brake chopper for the resistive element.
17. The wind turbine system of claim 13 , wherein the switching module comprises a switching element coupled between the DC link and the selector switch and a diode associated with the switching element.
18. The wind turbine system of claim 13 , wherein the wind-driven generator comprises a doubly fed induction generator.
19. The wind turbine system of claim 13 , wherein the storage device comprises at least one battery.
20. The wind turbine system of claim 13 , further comprising a filter associated with the storage device.