A Control Method for Frequency Doubling Noise Suppression in Permanent Magnet Synchronous Generator
Because of the inevitable deviations in the structural design of permanent magnet synchronous generators and the nonlinear characteristics of wind power converter switching devices,the output torque of permanent magnet synchronous generators exhibits certain fluctuations.But the large torque pulsation of the motor will increase the mechanical stress of the wind turbine generator system,accelerate component wear,generate noise and vibration,affect the tower life,thereby affecting the stability and reliability of the entire system.A self-adaptive torque ripple suppression control method based on active harmonic injection of load current is proposed to address the problem of high noise and obvious vibration in a 3.2 MW wind turbine produced by a domestic manufacturer.Through theoretical research and on-site analysis testing,this method effectively reduces the noise and vibration of this model by more than 76%.This method focuses on the 5th and 7th voltage harmonics generated on the generator side.By injecting 5th and 7th compensation currents into the control algorithm of the inverter on the generator side,this current interacts with the fundamental permanent magnet potential to keep the total flux linkage inside the motor close to the expected value and reduce the vibration frequency of the generator.And according to the on-site data measurement,the fixed resonance elimination parameters are selected for each speed range to achieve the purpose of frequency doubling noise suppression.
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