Abstract
Given the MW-level direct-drive wind generation system, the optimal efficiency of generators and converters is analyzed. The loss model of the generators including iron loss and the neutral point clamping three-level converters is established. Based on the loss model and the voltage, current limit, the generators and converters, optimal efficiency analytic expressions of direct current are obtained by analyzing the relationships of direct current and loss under given torque, and then optimal efficiency solution of the wind system is got. Finally, Simulation and experiment results on a 2MW “back to back” PWM converter prototype indicate: in the fixed torque and speed condition, such optimal efficiency control is more efficient than the traditional control strategy not only on the generator or converter efficiency but also on the wind generation system.
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