Abstract: The present invention relates to control of a wind turbine to reduce structural loading due to vibrations of the blades along the edgewise direction. A rotor control system for actuating pitch of pitch-adjustable rotor blades of a wind turbine is disclosed. Pitch modification signals are determined based on edgewise load signals for each of the rotor blades. The edgewise load signal are coordinated transformed and input into a primary whirling controller unit to provide whirling signal components which can be used for determining the pitch modification signals.

Abstract: A method of designing a wind turbine rotor blade. The method includes selecting a gravity load safety factor associated with wind turbine rotor blade fatigue loading due to gravity, that is selected to be less than a defined wind load safety factor associated with wind turbine rotor blade fatigue loading that is not due to gravity. The method includes determining a gravity-corrected design load for wind turbine rotor blade deflection, that is determined based on the selected gravity load safety factor and the defined wind load safety factor. The method includes designing a gravity-corrected wind turbine rotor blade in accordance with the determined gravity-corrected design load.

Abstract: The present invention relates to blade monitoring of a wind turbine by actively promoting blade vibrations by imposing a pitch actuation signal. A method of operating a wind turbine is disclosed where for each blade of a wind turbine, vibrations of the blade are actively promoted by imposing a pitch actuation signal to the pitch actuator, and at least one parameter relating to the blade vibration is determined.

Abstract: A method of designing a wind turbine rotor blade. The method includes selecting a gravity load safety factor associated with wind turbine rotor blade fatigue loading due to gravity, that is selected to be less than a defined wind load safety factor associated with wind turbine rotor blade fatigue loading that is not due to gravity. The method includes determining a gravity-corrected design load for wind turbine rotor blade deflection, that is determined based on the selected gravity load safety factor and the defined wind load safety factor. The method includes designing a gravity-corrected wind turbine rotor blade in accordance with the determined gravity-corrected design load.

Abstract: The present invention provides a method of estimating an orientation of a wind turbine. The method comprises determining, using a polarising light compass of the wind turbine, a sun polarisation value, and determining a yaw angle of the wind turbine associated with the sun polarisation value. A sun direction vector is determined based on the sun polarisation value and the associated yaw angle; and an orientation of the wind turbine is estimated relative to a fixed direction using the sun direction vector.

Abstract: The present disclosure relates generally to an improvement in computer processing to achieve a new outcome in real time with lower processing requirements and more particularly to a system and method for optimal resource allocation implemented in real time with lower processing requirements to increase responsiveness. When an electronically formatted resource response is received by a central server processing subsystem, the electronically formatted resource response is analysed first for a unique offer identifier at entry to the central server processing subsystem to identify the offer and then for an accept or decline marker.

Abstract: The present disclosure relates generally to an improvement in computer processing to achieve a new outcome in real time with lower processing requirements and more particularly to a system and method for optimal resource allocation implemented in real time with lower processing requirements to increase responsiveness. When an electronically formatted resource response is received by a central server processing subsystem, the electronically formatted resource response is analysed first for a unique offer identifier at entry to the central server processing subsystem to identify the offer and then for an accept or decline marker.

Abstract: A toe valve having an outer tubular member, including at least one outer flow port, and an inner tubular member positioned at least partially within the outer tubular member and including a central flow passage. An indexing mechanism is positioned within the outer tubular member and there is a flow path allowing fluid pressure from the central passage to act against a first side of the indexing mechanism. A biasing device acts on a second side of the indexing mechanism and the indexing mechanism is configured to allow communication between the central flow passage and the outer flow port after the indexing mechanism is subject to a plurality of pressure cycles within the central flow passage.

Abstract: A toe valve having an outer tubular member, including at least one outer flow port, and an inner tubular member positioned at least partially within the outer tubular member and including a central flow passage. An indexing mechanism is positioned within the outer tubular member and there is a flow path allowing fluid pressure from the central passage to act against a first side of the indexing mechanism. A biasing device acts on a second side of the indexing mechanism and the indexing mechanism is configured to allow communication between the central flow passage and the outer flow port after the indexing mechanism is subject to a plurality of pressure cycles within the central flow passage.

Abstract: An object counting mechanism for a downhole tool which includes a tool housing having a central passage and a seat configured to selectively catch an object passing through the central passage. An activating mechanism is configured to move the seat from a first state allowing the object to pass through the seat into a second state for catching the object on the seat. A rotating sleeve causes the activating mechanism to move the seat into the second state after a given degree of rotation of the rotating sleeve. At least one contact surface is spaced apart from the seat and positioned to engage the object passing through the central passage, thereby effecting a limited rotation of the rotating sleeve at each passage of an object.

Abstract: A wedge connector for mechanically securing two electrical cables and making them electrically common is disclosed. The wedge connector has a C-shaped body member and a wedge. The body member has sides that converge toward a first body member end from a second body member end. The body member has edges that are formed to define a pair of inwardly facing channels connected by a web extending between the channels. The wedge also has converging sides to be conformably received in the C-shaped body member. The wedge has concave, outwardly facing surfaces on each side connected by a web extending between the sides. It also has a spring rib formed in the web that extends continuously from a first wedge end toward a second wedge end.

Abstract: A wedge connector for mechanically securing two electrical cables and making them electrically common is disclosed. The wedge connector has a C-shaped body member and a wedge. The body member has sides that converge toward a first body member end from a second body member end. The body member has edges that are formed to define a pair of inwardly facing channels connected by a web extending between the channels. The wedge also has converging sides to be conformably received in the C-shaped body member. The wedge has concave, outwardly facing surfaces on each side connected by a web extending between the sides. It also has a spring rib formed in the web that extends continuously from a first wedge end toward a second wedge end.