Patent ID: 7982326

Claim:
A wind turbine comprising: a power converter configured to be coupled to a wind turbine generator and configured to receive converter control signals; and a system controller coupled to the power converter, wherein the system controller is configured to supply power and/or torque control signals to the power converter to regulate the fundamental power and/or torque produced by the wind turbine generator, wherein the system controller is further configured to supply harmonic control signals to the power converter to reduce acoustic noise and/or torque ripple generated by the wind turbine generator, and wherein the system controller comprises: (i) a fundamental current controller configured for providing fundamental voltage commands, (ii) harmonic current controller configured for using harmonic current commands, current feedback signals from the permanent magnet machine, and fundamental current commands in combination with positive and negative sequence regulators to obtain harmonic voltage commands, and (iii) summation elements configured for adding the fundamental voltage commands and the harmonic voltage commands to obtain the converter control signals.