Abstract:
Aspects of the present disclosure are generally directed to a multi-rotor turbine having with a common line-side converter (LSC) (DC to AC converter) for each of a plurality of machine-side converters (AC to DC converters). For example, the multi- rotor turbine may include a plurality of machine-side converters (MSC), each configured to receive an alternating current (AC) input signal from one of a plurality of rotors of the multi-rotor turbine and generate a DC signal based on the input AC signal. The multi-rotor turbine may also include a line-side converter (LSC) configured to receive the DC signals from each of the plurality of MSCs and generate an output AC signal based on the DC signals.
Abstract:
A wind turbine blade includes a hub end, a tip end, a leading edge, a trailing edge, a pressure side, and a suction side. At least one boundary layer fence is located on at least one of the pressure side and the suction side of the blade. A plurality of passages is formed in the fence. Each passage has an inlet on a hub end side of the fence and an outlet on a tip end side of the fence and a cross-section that decreases from the inlet to the outlet. Each outlet is oriented to discharge air towards the trailing edge of the blade.
Abstract:
A multirotor wind turbine (1) comprising a tower structure (2) and at least one load carrying structure (3, 4), each load carrying structure (3, 4) being arranged for carrying two or more energy generating units (5, 7) comprising a rotor (6, 8). At least two of the rotors are upwind or downwind rotors (6), the energy generating units (5) comprising upwind or downwind rotors (6) being arranged with their centres of gravity at a first distance behind the tower structure (2) along a direction of the incoming wind, substantially at the same vertical level, and at opposite sides of the tower structure (2) at substantially the same second distance to the tower structure (2) along a direction substantially perpendicular to the direction of the incoming wind. The multirotor wind turbine (1) is self-yawing, even under turbulent wind conditions.
Abstract:
A wind turbine (30) includes a support structure (12) and at least one energy generating assembly (32) having central structures along an axis of rotation such as a rotor hub (40) and a nacelle (46), which may enclose a generator (44) for transferring rotations of the hub (40) and wind turbine blades (42) extending from the hub (40) and caused by airflow into electrical energy. One of the central structures includes an aft end (50) defining a corrugated profile (34) with a plurality of lobes (36). Airflow over these lobes (36) generates powerful flow vortices which help mix out the wake flows downstream from the wind turbine (30). A method of using the lobes (36) for reducing a wake region downstream of the wind turbine (30) is also disclosed.
Abstract:
A method for controlling a wind turbine, the wind turbine comprising a wind turbine blade, the method comprising: measuring one or more wind turbine parameters; determining, based on the one or more wind turbine parameters, whether negative stall will occur at an outboard region of the wind turbine blade; generating a first signal if it is determined negative stall will occur at the outboard region of the wind turbine blade; and activating a lift disrupting device for disrupting airflow over the suction side of the wind turbine blade in response to the generated first signal such that the lift generated by the wind turbine blade is reduced; wherein the lift disrupting device for disrupting airflow over the suction side of the wind turbine blade is disposed at a mid-board region of the wind turbine blade.
Abstract:
A wind turbine blade extending in a spanwise direction from a root end to a tip end, the blade having a pressure surface and a suction surface, the blade comprising: a truncated trailing edge having a trailing edge surface between the pressure surface and the suction surface; a pressure surface aft corner where the trailing edge surface connects with the pressure surface; a suction surface aft corner where the trailing edge surface connects with the suction surface; wherein the trailing edge surface is curved in cross-section and the truncated trailing edge comprises a plurality of channels.
Abstract:
A wind turbine includes at least one energy generating unit including a rotor having at least one wind turbine blade wherein the rotor is configured to rotate under a primary airflow, and a generator configured to convert the rotation of the rotor into electrical energy. The at least one energy generating unit is carried by a support structure having a portion which is exposed to the primary airflow and/or a secondary airflow from the rotor of the at least one energy generating unit. A fairing is coupled to the support structure along a downstream side of the portion and defines a trailing edge, wherein the trailing edge has a corrugated profile. A method of using the fairing for reducing a wake region downstream of the support structure is also disclosed.