Battery-supported braking system for a wind turbine

A method for protecting a wind turbine power system connected to a power grid, the wind turbine power system having a generator with a stator and a rotor and a power converter having a rotor-side converter, a grid-side converter, and a DC link configured therebetween, the method comprising:

• monitoring, via one or more sensors, one or more operating conditions of the power grid;
• determining, via a controller, whether an electromagnetic (EM) torque loss event is occurring in the power grid based on the one or more operating conditions;
• in response to detecting the EM torque loss event, disconnecting, via the controller, the power converter and the generator from the power grid and connecting a main brake circuit and a battery system to the generator so as to generate an EM torque, the battery system separate from the power converter of the wind turbine power system and electrically coupled to one or more phases of the rotor of the generator via a battery switch element, the battery system comprising a battery resistive element, which comprises a resistor and a parallel contactor;
• and,
• generating the EM torque via at least one of the main brake circuit or the battery system.

A method for protecting a wind turbine power system connected to a power grid, the wind turbine power system having a generator with a stator and a rotor and a power converter having a rotor-side converter, a grid-side converter, and a DC link configured therebetween, the method comprising:

• monitoring, via one or more sensors, one or more operating conditions of the power grid;
• determining, via a controller, whether an electromagnetic (EM) torque loss event is occurring in the power grid based on the one or more operating conditions;
• and,
• in response to detecting the EM torque loss event, disconnecting the power converter and the generator from the power grid and generating an EM torque via a main brake circuit and a battery system depending on her the EM torque loss event is critical or non-critical, the battery system separate from the power converter of the wind turbine power system and electrically coupled to one or more phases of the rotor of the generator via a battery switch element, the battery system comprising a battery resistive element, which comprises a resistor and a parallel contactor.