Abstract:
A proactive method prevents vibrations in one or more rotor blades of a wind turbine when the wind turbine is in a standstill idling state with a rotor hub free to rotate. The method determines a minimum revolution rate of the rotor blades that prevents vibrations of the rotor blades and that the actual revolution rate of the rotor blades is below the minimum revolution rate. A wind parameter is detected and determined to be above a threshold limit. The method also detects if grid power is available for pitching the rotor blades. Based on the wind parameter, a controller determines a pitch angle for one or more of the rotor blades to increase rotation of the blades to at least the minimum revolution rate. The controller initiates pitching the rotor blades to increase the revolution rate of the rotor blades prior to vibrations being induced in the rotor blades.
Abstract:
A method for reducing loads of a wind turbine includes determining an operational state of the wind turbine. The method also includes commanding a predetermined pitch event. Further, the method includes monitoring at least one operating condition of a pitch drive mechanism of a rotor blade of the wind turbine during the predetermined pitch event. If the operational state corresponds to a predetermined operational state and the operating condition(s) follows a pitch fault pattern during the predetermined pitch event, the method also include yawing a nacelle of the wind turbine away from an incoming wind direction.
Abstract:
Structures and methods for joining misaligned or dissimilar width spar caps are disclosed as having a connecting structure in a rotor blade assembly for a wind turbine, wherein a first blade segment defines a first joint end, the first blade segment having at least one spar cap. A second blade segment defines a forward end coupled to the first blade segment, the second blade segment having at least one spar cap offset from the spar cap of the adjoining first blade segment. At least one connecting structure is coupled between the adjoining spar caps of the first blade segment and the second blade segment, the connecting structure having a plurality of sequentially stacked plies configured for parallel fiber alignment with the adjoining spar caps and cross-sectional area continuity with the adjoining spar caps.
Abstract:
The present disclosure is directed to a system and method for controlling a wind turbine during adverse wind conditions. In one embodiment, the method includes monitoring one or more wind conditions near the wind turbine. Another step includes detecting one or more adverse wind conditions near the wind turbine. In response to detecting one or more adverse wind conditions, the method also includes reducing a power output of the wind turbine by a predetermined percentage. Further, the predetermined percentage is a function of a number and a type of the detected adverse wind conditions occurring during a predetermined time period.
Abstract:
The present disclosure is directed to a system and method for controlling a wind turbine during adverse wind conditions. In one embodiment, the method includes monitoring one or more wind conditions near the wind turbine. Another step includes detecting one or more adverse wind conditions near the wind turbine. In response to detecting one or more adverse wind conditions, the method also includes reducing a power output of the wind turbine by a predetermined percentage. Further, the predetermined percentage is a function of a number and a type of the detected adverse wind conditions occurring during a predetermined time period.
Abstract:
A blade insert for coupling a first blade segment to a second blade segment is disclosed. The blade insert may generally include an aerodynamic body extending between a forward end configured to be coupled to the first blade segment and an aft end configured to be coupled to the second blade segment. The aerodynamic body may include a top side extending between a forward edge and an aft edge. The top side may define a top scarfed section at its forward edge. The aerodynamic body may further include a bottom side extending between a forward edge and an aft edge. The bottom side may define a bottom scarfed section at its forward edge. Additionally, at least a portion of the forward edge of the top side may be configured to be offset relative to the forward edge of the bottom side.
Abstract:
A proactive method prevents vibrations in one or more rotor blades of a wind turbine when the wind turbine is in a standstill idling state with a rotor hub free to rotate. The method determines a minimum revolution rate of the rotor blades that prevents vibrations of the rotor blades and that the actual revolution rate of the rotor blades is below the minimum revolution rate. A wind parameter is detected and determined to be above a threshold limit. The method also detects if grid power is available for pitching the rotor blades. Based on the wind parameter, a controller determines a pitch angle for one or more of the rotor blades to increase rotation of the blades to at least the minimum revolution rate. The controller initiates pitching the rotor blades to increase the revolution rate of the rotor blades prior to vibrations being induced in the rotor blades.
Abstract:
Systems and methods for providing power to a blade pitch system in a wind turbine are provided. A blade pitch system can include one or more motors configured to pitch one or more blades of a wind turbine and a power source. The power source can include a plurality of energy storage devices coupled in series. The plurality of energy storage devices can be configured to provide power to the one or more motors during a power loss event. The power source can further include at least one bypass current device configured to allow a bypass current to provide power from at least one energy storage device to the one or more motors. The bypass current can be a current that bypasses one or more failed energy storage devices in the plurality of energy storage devices.
Abstract:
A counterweight system for mounting a rotor blade on a balanced rotatable hub of a wind turbine is disclosed. The rotatable hub can have at least one blade root region configured to receive a blade root of the rotor blade, and also have a pitch system configured to rotate the rotor blade around a pitch axis. The counterweight system can have at least one support structure having a proximal end spaced apart from a distal end with the proximal end mountable to at least one blade root region of the rotatable hub. The at least one counterweight mass can be at least partially filled with fluid and coupled to the distal end of the at least one support structure. The at least one support structure can be arranged substantially parallel to the pitch axis such that the pitch system rotates the counterweight mass about the pitch axis.
Abstract:
A method for reducing loads of a wind turbine includes determining an angular pitch speed parameter of the rotor blade of the wind turbine. The method also includes determining an operational state of the wind turbine. Further, the method includes comparing the angular pitch speed parameter to a predetermined parameter threshold during turbine shutdown and/or a commanded pitch event. If the operational state corresponds to a predetermined operational state, the method includes yawing a nacelle of the wind turbine away from an incoming wind direction when the angular pitch speed parameter is below the predetermined parameter threshold during the turbine shutdown and/or the commanded pitch event.