Shutdown control method and device for wind power generator set

Abstract

The invention provides a shutdown control method and device for a wind power generator set. The method comprises the steps that an interval with a larger decrease rate of the rotating torque in a curve of the corresponding relation between the rotating speed and the rotating torque in the operating process of a preset wind power generator set is determined, an inflection point corresponding to a smaller rotating speed value in the inflection points of two ends of the interval is used as a critical point, and one or more reference points are selected according to the critical point; the rotating speed when a wind power generator is shut down is collected, when the rotating speed is higher than the rotating speed corresponding to the critical point, and a monotonous shutdown control functionwith an upward opening is constructed according to the rotating torque and rotating speed data corresponding to the reference point and the rotating torque and rotating speed data of the actual initial shutdown time of the wind power generator set; and a rotating torque value corresponding to the rotating speed is obtained according to the shutdown control function, and shutdown control is carried out on the wind power generator by utilizing the rotating torque value. According to the method, the rotating torque of the generator can be declined in a more stable manner, so that the vibration impact on the wind power generator set caused by sudden change of the rotating torque in the shutdown process is reduced.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a shutdown control method and device of a wind power generating set. Background technique [0002] Energy is the main material basis of social economy and human life, and the driving force of social development. However, the reserves of non-renewable energy such as petroleum, coal, and natural gas, which are the main pillars of energy in the world, are decreasing day by day. All countries in the world are developing wind power generation. As a new energy source, wind power generation has formed a mature scale. [0003] The wind turbine is a device that converts wind energy into electrical energy. The wind energy drives the main shaft, the gearbox, and the generator set through the impeller to convert it into electrical energy, and through grid-connected control, the electrical energy generated by the wind turbine is transmitted to the grid. Therefore, th...

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Problems solved by technology

[0004] At present, the shutdown method of wind turbines is to realize aerodynamic braking through the emergency feathering function of the pitch control system. Since the generator is loaded with a large electromagnetic torque when the wind turbine is generating electricity, if it is disconnected from the grid immediately, the large electromagnetic torque will suddenly Disappearance will cause a great impact to the unit, so during the shutdown process, as the generator speed decreases, the torque value will also decrease, and the decrease in torque is also along the speed-torque curve of the wind turbine. However, the speed-torque curve has a large downward slope in the high-speed section, which will cause the torque to drop too fast, which will cause unit vibration. The existing safety protection system does not have an effective control method to reduce the impact of the shutdown process on the power generation. The impact generated by the unit, thus effectively protecting the generator set

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