Hybrid braking system and method
First Claim
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1. A hybrid braking system for a wind turbine, comprising:
- a mechanical brake coupled to a main shaft of a wind turbine for applying reaction torque upon braking of the wind turbine;
an electrical braking circuit coupled to a generator of the wind turbine, the electrical braking circuit including a controllable switch; and
a controller coupled to the mechanical brake and the electrical braking circuit, the controller configured to activate the electrical braking circuit simultaneously with the mechanical brake,wherein active power from the generator is transferred to the electrical braking circuit in response to a signal from the controller to the controllable switch of the electrical braking circuit.
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Abstract
A wind turbine hybrid braking system is presented. The system includes a generator coupled to a main shaft of the wind turbine for generating and transmitting power. A mechanical brake is coupled to the main shaft for applying reaction torque upon braking of the wind turbine. The system further includes an electrical braking circuit coupled to the generator for acting in conjunction with the mechanical brake and dissipating active power via controlled switching.
48 Citations
19 Claims
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1. A hybrid braking system for a wind turbine, comprising:
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a mechanical brake coupled to a main shaft of a wind turbine for applying reaction torque upon braking of the wind turbine; an electrical braking circuit coupled to a generator of the wind turbine, the electrical braking circuit including a controllable switch; and a controller coupled to the mechanical brake and the electrical braking circuit, the controller configured to activate the electrical braking circuit simultaneously with the mechanical brake, wherein active power from the generator is transferred to the electrical braking circuit in response to a signal from the controller to the controllable switch of the electrical braking circuit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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- 9. A method to dampen dynamic torque on a shaft of a wind turbine using a hybrid braking system, the method comprising, upon receipt of an emergency stop signal, simultaneously mechanically braking the shaft and activating a controllable switch of an electrical braking circuit to dissipate active power from the wind turbine to a power resistor of the electrical braking circuit.
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14. A hybrid braking system comprising:
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a mechanical brake coupled to a main shaft of a wind turbine; an electrical braking circuit coupled to a generator of the wind turbine, the electrical braking circuit comprising; at least one semiconductor switch, a switching control circuit, and at least one power resistor for dissipating active power from the generator, and a controller coupled to the mechanical brake and the electrical braking circuit, the controller configured to activate the electrical braking circuit simultaneously with the mechanical brake in response to an emergency stop signal. - View Dependent Claims (15, 16, 17, 18, 19)
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Specification