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In the permanent magnet direct drive wind power generation system, the direct current (DC) bus voltage signal of the converter is usually used as the feedback of the voltage outer loop. Because of the existence of random white noise and the measurement error when the sensor collects the DC bus voltage signal, it is necessary to filter the bus voltage signal through the first-order inertial link. The time constant of the first order inertial link is usually 10ms-15ms. In the traditional voltagedoi:10.1109/access.2020.2967395 fatcat:pod6ehllnnamfftwo2pvfy6ihm