Abstract: An electrical power system connected to a power grid can include a generator having a stator and a rotor and a power converter. The stator is connected to the power grid via a stator power path. The power converter can include a line-side converter coupled to the power grid via a converter power path and a rotor-side converter coupled to a rotor bus of the rotor and the line-side converter via a DC link. The rotor-side converter is configured to convert a DC power on the DC link to an AC signal for the rotor bus. The power system can also include an active filter having one or more active controlled components. The active filter is coupled in parallel with the rotor-side converter to reduce harmonics of the electrical power system.

Abstract: Systems and methods for operating a power system having a doubly fed induction generator are provided. In example implementations, an electrical power system connected to a power grid can include a generator comprising a stator and a rotor, the stator connected to the power grid via a stator power path, and a power converter. The power converter can include a line-side converter coupled to the power grid via a converter power path and a rotor-side converter coupled to a rotor bus of the rotor and the line-side converter via a DC link, the rotor-side converter configured to convert a DC power on the DC link to an AC signal for the rotor bus. The power system can also include an active filter comprising one or more active controlled components, the active filter being coupled in parallel with the rotor-side converter to reduce harmonics of the electrical power system.

Abstract: A method for controlling a pitch control system of a wind turbine includes providing a charged backup battery configured to supply no energy to a DC link when full AC input power is available, wherein the DC link includes a DC link capacitor. The method further includes using energy stored in the DC link capacitor to operate a pitch control system during a loss or dip of AC input power, and maintaining charge on the DC link capacitor using the charged backup battery as voltage across the DC link capacitor drops during the operation of the pitch control system.

Abstract: Systems, methods, and apparatuses for balancing capacitor load are provided. A system includes a plurality of capacitors, a plurality of respective positive connections and a plurality of respective negative connections that connect each of the plurality of capacitors to at least one power source, where each of the plurality of positive connections has an approximately equal length, and each of the plurality of negative connections has an approximately equal length.

Abstract: A rotor for a wind turbine generator includes a rotatable hub forming a cavity. A plurality of rotor blades is connected to the hub. A heat sink is at least partially positioned within the cavity and extends along a portion of a corresponding rotor blade. The heat sink includes a bottom surface mounted on a thermal energy generating component of the wind turbine generator. An opposing top planar surface includes a plurality of pins extending therefrom. The pins form an air flow path through the pins to dissipate the generated thermal energy from the thermal energy generating component.

Abstract: A method for powering a pitch motor drive system for at least one DC pitch motor of a wind turbine includes rectifying a voltage using a bridge circuit to thereby supply a DC link voltage to a bridge comprising active switching devices, and utilizing at least one link capacitor to smooth the DC link voltage and act as an energy sink and source for the DC pitch motor or motors.