Wind energy capture of magnetic suspension yaw wind turbine generator

Abstract

The invention discloses a wind energy capture method applied to large and medium-sized magnetic suspension yaw wind turbine generators. The method combines cabin suspension regulation and control, yaw wind facing, laterodeviation protection and generator power control, comprises two parts, namely the power tracking control of a generator and the yaw control of a rotating body of the wind turbine generator, and realizes maximum wind energy capture at a rated wind speed, laterodeviation protection at the rated wind speed and unit safety protection at a cut-out wind speed. Due to different wind speeds and different wind directions, work is separately carried out in the three working modes of suspension wind energy capture, non-suspension wind energy capture and unit safety protection, the power control of the generator and the yaw of the rotating body of the wind turbine generator are cooperatively regulated and controlled, and the safe capture of wind energy power is realized. The wind energy capture method effectively improves the yaw control precision of the wind turbine generator, the power control precision of the generator, the wind energy capture efficiency and the wind energy capture safety of the wind turbine generator.

Description

technical field [0001] The invention relates to a wind energy capture method applied to large and medium-sized wind turbines to realize maximum capture of wind energy, lateral deviation protection, and unit safety protection, especially a wind energy capture method that integrates a magnetic levitation yaw system that can accurately face the wind and generator power regulation. The capture method effectively improves the wind energy capture efficiency and the wind energy capture safety. Background technique [0002] With the depletion of fossil fuels and the seriousness of environmental pollution, wind power generation is highly concerned by researchers from all over the world because of its strict pollution-free. However, wind energy volatility and intermittent problems seriously affect the stability of the power grid and the quality of load power supply, and even endanger the safety of the power grid. Wind energy capture can significantly improve the utilization of wind en...

AI Technical Summary

Problems solved by technology

[0003] The wind energy capture of the traditional wind power system includes maximum power tracking and generator power control. The maximum power tracking uses the machine-side converter to control the generator speed, and at the same time uses the yaw to realize the frontal wind of the wind turbine. However, the above two methods are generally completed independently. The machine tracking speed corresponds to the wind speed measured by the wind direction sensor, rather than the effective wind speed caused by yaw, which reduces the captured power of the generator

At the same time, wind speed fluctuations and wind speed and anemometer measurement errors often lead to non-optimal generator tracking speeds. Although related literature uses disturbance optimization to compensate for generator output power deviations, it leads to generator output power fluctuations, which invisibly increases the difficulty of power grid dispatching.

At the same time, the random fluctuation of wind speed and direction can easily lead to the lateral deflection of the fan blades, which greatly reduces the capture of wind energy. The yaw device is the key device to solve the above problems. However, the traditional yaw device generally uses multi-motor Problems such as complex structure and high failure rate, especially the large friction loss often increase the yaw power consumption of the wind turbine

In addition, the yaw speed of the wind turbine is generally set slowly to ensure the overall safety of the wind turbine, and the reference of the generator speed is based on the natural wind speed measured by the anemometer, not the effective wind speed obtained by the actual yaw headwind, which cannot truly achieve maximum power tracking.

For the working conditions above the rated wind speed, the traditional wind turbine usually adopts the method of combining pitch control and yaw control, but the yaw load torque is generally large at this time, and the large yaw starting current can easily cause the yaw motor to and gear transmission damage, seriously affecting the stability and safety of the yaw fan unit

Images