Transmission chain oscillation inhibition method for wind driven generator

Abstract

The invention discloses a transmission chain oscillation inhibition method for a wind driven generator, and the method employs four steps to carry out the real-time flexible correction of a generator given torque (shown in the description) outputted by a main control torque controller in an operation process of the wind driven generator: calculating an amplitude value (shown in the description) corresponding to a transmission chain oscillation frequency (shown in the description) in a rotating speed signal (shown in the description) of the generator in real time through an FFT module; calculating a compensation phase angle (shown in the description) through employing a disturbance method for control according to the amplitude value (shown in the description); calculating a compensation torque (shown in the description) with the frequency (shown in the description) and amplitude (shown in the description) in real time through according to the inputted rotating speed signal of the generator through employing a dynamic band-pass filter; and correcting a total output torque (shown in the description) which is actually transmitted to a current transformer for execution. Through the above correction, the method dynamically adjusts the optimal phase angle and optimal gain parameter of a damping moment in real time, achieves the personalized setting of unit parameters, achieves an effect of inhibiting the transmission chain oscillation, reduces the fault rate of a gear box elastic support, a shaft coupler and related flexible parts, and can effectively improve the stability of a wind driven generator set.

Description

Technical field [0001] The invention relates to a method for restraining the transmission chain oscillation of a large-scale wind power generating set. Background technique [0002] In order to ensure that the wind turbine can absorb the maximum wind energy during the power climbing process, the torque control of large wind turbines at home and abroad is generally completed by a look-up table method, that is, a rotation speed corresponds to a fixed optimal torque. However, with the continuous increase of unit capacity and the development of low wind speed units, the length of the blades continues to increase. Due to the existence of wind shear, the unbalance force of the unit in the vertical direction of the wind turbine continues to increase, and the transition zone of the unit is controlled. The increasing slope of torque change causes the external excitation of the unit transmission chain to continue to increase. When the transmission chain itself is not sufficiently damped to...

AI Technical Summary

Problems solved by technology

However, with the continuous increase of unit capacity and the development of low wind speed units, the length of the blades continues to increase. Due to the existence of wind shear, the unbalanced force of the unit in the vertical direction of the wind rotor continues to increase. In addition, the control in the transition zone of the unit The slope of the torque change is increasing, which leads to the continuous increase of the external excitation on the transmission chain of the unit. When the damping of the transmission chain itself is not enough to suppress the response of the transmission chain caused by the external excitation, the transmission chain of the unit will oscillate, causing the gearbox to Damage to flexible components such as elastic supports and couplings

[0003] At present, most domestic and foreign transmission chain oscillation suppression methods for large-scale units are to add a damper to the torque control, but the damper used has no phase correction function, and the gain parameter is fixed

However, in the actual operation of the unit, affected by the PLC calculation period and the line signal delay, the actual reverse damping torque required is often different from the calculated damping by a certain phase delay angle, and the optimal gain parameter of the unit is also related to the characteristics of the unit itself , directly using the traditional damper can not get a good suppression effect

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