Method of operating a wind turbine without grid connection and wind turbine
AssigneeAdwen GmbH
InventorsPatrick Achenbach, Wilhelm Janssen
Life of this patent
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Abstract
A wind turbine comprises a permanent magnet synchronous generator, a main converter, a main converter controller, a wind turbine master controller and an electrical power supply stage comprising an electrical energy storing device. A startup of the wind turbine can be performed using electrical energy from the electrical energy storing device independent from a power supplying grid and/or a combustion engine. After startup, the wind turbine can be operated in an island mode by controlling an intermediate voltage of the main converter by the main converter controller and retrieving power from the synchronous generator independent from the electrical energy storing device.
Claims16
A method of operating a wind turbine, the wind turbine comprising a permanent magnet synchronous generator, a main converter, a main converter controller, a wind turbine master controller, and an electrical power supply stage comprising an electrical energy storing device, wherein the method comprises:
- performing a startup of the wind turbine using electrical energy from the electrical energy storing device independent from at least one of a power supplying grid and a combustion engine;
- operating the wind turbine in an island mode by:
- ceasing a sending of torque requests to the main converter controller from the wind turbine master controller;
- controlling a DC link voltage of the main converter by the main converter controller;
- retrieving power from the permanent magnet synchronous generator independent from the electrical energy storing device after startup;
- controlling torque of the wind turbine by the main converter controller instead of the wind turbine master controller;
- and
- adjusting a pitch angle of rotor blades in response to a rotational speed of the permanent magnet synchronous generator and of a rotor in the island mode by the wind turbine master controller.
A wind turbine comprising:
- a permanent magnet synchronous generator;
- a main converter;
- a main converter controller;
- a wind turbine master controller;
- and
- an energy storage device, the wind turbine being configured to perform a first startup of the wind turbine independent from an external power supply by retrieving power from the energy storage device and subsequently transitioning into an island mode, wherein, in the island mode a sending of torque requests to the main converter controller from the wind turbine master controller is ceased, and the main converter controller is configured to control torque and/or a DC link voltage of the main converter;
- wherein the turbine master controller is configured to adjust a pitch angle of rotor blades in response to a rotational speed of at least one of the permanent magnet synchronous generator and of a rotor in the island mode.
A method of manufacturing a wind turbine comprising:
- assembling the wind turbine in a first location;
- completely burning-in the wind turbine under full load;
- disassembling of the wind turbine at the first location;
- re-assembling of the wind turbine at a second location;
- performing a startup or black start of the wind turbine without connection to a grid or a combustion generator only based on electrical energy supplied by an electrical energy storing device that is internal to the wind turbine;
- operating the wind turbine in an island mode by:
- ceasing a sending of torque requests to the main converter controller from the wind turbine master controller;
- controlling a DC link voltage of the main converter by the main converter controller;
- retrieving power from the permanent magnet synchronous generator independent from the electrical energy storing device after startup;
- controlling torque of the wind turbine by the main converter controller instead of the wind turbine master controller;
- and
- adjusting a pitch angle of rotor blades in response to a rotational speed of the permanent magnet synchronous generator and of a rotor in the island mode by the wind turbine master controller.
A method of operating a wind turbine having a rotor, the wind turbine comprising a permanent magnet synchronous generator, a main converter, a main converter controller, a wind turbine master controller and an electrical power supply stage comprising an electrical energy storing device, the method comprising:
- performing a startup of the wind turbine using electrical energy from the electrical energy storing device independent from a power supplying grid and/or a combustion engine;
- operating the wind turbine in an island mode by
- controlling an intermediate voltage of the main converter and a torque of the wind turbine by the main converter controller;
- adjusting a pitch angle of rotor blades of the rotor in response to a rotational speed of at least one of the generator and the rotor by the wind turbine master controller, wherein the pitch angle is only adjusted, if at least one of the rotor rotations per minute (nR) and the generator rotations per minute (nG) are outside a tolerance band defined by a minimum value of rotations per minute and a maximum value of rotations per minute;
- and
- retrieving power from the permanent magnet synchronous generator independent from the electrical energy storing device after startup.
Dependencies are inferred from the claim text.