Independent pitch system and pitch method based on electric effective damping

Abstract

The invention relates to an independent pitch changing system and a pitch changing method based on electric effective damping, which belong to the technical field of wind power generation. Its pitch system is that each of the blades has an independent pitch device, and the pitch device includes a pitch controller, a pitch driver, an electric damper and a pitch motor, and the pitch drivers are connected to the pitch controller respectively. The motor and the electric damper, the pitch controller are connected to the pitch driver, and the three pitch controllers are respectively connected to the main control controller of the wind turbine. Each blade of the wind turbine of the present invention independently changes the pitch angle according to its own control law, and by dynamically adjusting the pitch angles of the three blades respectively, each blade can obtain a different target position, reduce the dynamic balance load, and The asymmetrical rotor load compensation reduces the flapping vibration of the blades by the wind and reduces the stress impact of the transmission chain. When the wind speed is high, the variable generator torque and independent pitch angle are output to reduce the wind rotor speed and electric power fluctuations, and at the same time reduce the torque peak of the gearbox.

Description

technical field [0001] The invention belongs to the technical field of wind power generation, and in particular relates to an independent pitch-changing method and a pitch-changing system based on electric effective damping. Background technique [0002] The pitch control mechanism of the current wind turbine usually controls the three blades of the wind turbine uniformly through the electromagnetic torque control system, that is, the pitch angle of the blades changes in the same way. However, since the wind speed is not uniform across the sweeping surface of the wind rotor, it will cause fluctuations in the torque of the blades and affect the mechanical stress and fatigue life of the wind turbine transmission mechanism. Obviously it is more reasonable to control the three paddles individually. The traditional unified pitch control method cannot effectively maintain the multi-objective control of electric power and wind rotor speed stability. [0003] Problems existing in ...

AI Technical Summary

Problems solved by technology

Multi-objective control that cannot effectively maintain the stability of electric power and wind rotor speed using the traditional unified control pitch control method

[0003] Problems existing in the existing technology: 1. The traditional pitch control method cannot effectively reduce the electric power fluctuation while maintaining a stable wind rotor speed

2. All the blades of the wind turbine with uniform pitch change are controlled by one control mechanism to change the same pitch angle, so one pitch control actuator fails and must be shut down for maintenance

This measurement method needs to increase the sensor and additional hardware equipment, and needs to connect the sensor or measuring equipment, which increases the cable connection inside the fan, reduces the reliability of the overall operation of the fan, and the sensor measurement is also likely to cause signal interference

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