Yaw-control system and method based on frequency converter effective damping

Abstract

The invention provides a yaw-control system and method based on frequency converter effective damping, and belongs to the technical field of wind power generation. The yaw-control system comprises a main controller, at least one set of yaw-control motors, frequency converters, a brake system, a position encoder and an untwisting protector, wherein the frequency converters are connected with the yaw-control motors respectively. The number of the yaw-control motors in each set is four, wherein three of the yaw-control motors are yaw-control drive motors, and the other yaw-control motor is a yaw-control damping motor in the start and stop process. The frequency converters independently drive the yaw-control motors respectively. The position encoder and the untwisting protector are arranged on a yaw-control gear ring. The frequency converters, the untwisting protector and the position encoder are connected with the main controller. The soft start and soft stop of the yaw-control system can be achieved by driving the yaw-control motors through the frequency converters, the impact of the starting current on the motors is reduced, a draught fan can run stably, the service life of the motor is prolonged, and damage caused by the vibration of the draught fan is reduced; the speed regulating running of the yaw can be achieved by driving the yaw-control system through the frequency converters.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to a yaw system and a yaw method based on the effective damping of a frequency converter. Background technique [0002] The yaw system is a unique servo system of wind turbines, also known as the wind-facing device. Its performance directly affects the overall performance of the unit, as well as the utilization efficiency of wind energy and power generation efficiency. As the capacity of the wind turbine generator set increases, the equipment and weight of the cabin in the wind turbine generator set also increase. When the wind turbine yaws against the wind, the unit will produce gyro torque fluctuations, which will cause vibrations of the tower, blades, etc., thus posing a threat to the safety of the entire wind power generation system. [0003] Problems existing in the current existing technology: 1. From the perspective of structural performance, the ...

AI Technical Summary

Problems solved by technology

When the wind turbine yaws against the wind, the unit will produce gyro torque fluctuations, which will cause vibrations of the tower, blades, etc., thus posing a threat to the safety of the entire wind power generation system.

[0003] Problems existing in the current existing technology: 1. From the perspective of structural performance, the power frequency yaw motor is adopted. At the beginning and end of the yaw, the yaw hydraulic brake mechanism will act, which will also cause the cabin to shake greatly, and will also have an impact on the overall performance

However, if the conventional PID servo controller is applied to the yaw system, the yaw system needs to be started frequently, so that the yaw actuator will be easily damaged due to frequent actions.

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