Research on sub/super‐synchronous oscillation suppression method for direct‐drive wind turbine based on energy compensation

A method to suppress sub/super-synchronous oscillation of direct-drive wind turbines based on energy compensation is proposed. First, the transient model turbine built, and negative damping terms that lead are extracted. On this basis, expressions voltage corresponding derived by backward deduction, thus supplementary branches constructed, their impact fundamental frequency characteristics analyzed. And then, with reaching maximum increment fundamental-frequency being minimum as objective, frequency-domain characteristic control links satisfied constraints, a scheme optimize coefficients multiple established. Finally, built in RT-LAB for hardware-in-the-loop tests. Simulation results verify that, can realize fast frequency-dependent suppression different bands concerning grid strengths.