Abstract：In response to the complex working environment of pumped storage energy units，where

disturbances such as temperature variations are prominent，and considering the insufficient control precision of

traditional vector control for brushless doubly-fed machine（BDFM），a study was conducted on a control strategy

based on linear active disturbance rejection control（ADRC）for power decoupling of BDFM.This strategy aims to

mitigate disturbances，enhance control precision，improve operational characteristics，and consequently elevate the energy conversion efficiency within pumped storage energy systems. The mathematical model for BDFM in the

unified coordinate system and two-phase rotating coordinate system was established. The coordinate system was

determined using the power winding orientation method. The current relationship under the power winding

orientation was derived，and based on this，the control winding was used to control the active and reactive power of the power winding，thereby achieving power decoupling control.To improve control performance，the speed loop and current loop were rewritten，disturbances were analyzed，state equations were formulated，an extended state observer was designed，and the control performance of the machine was enhanced using the active disturbance rejection control technique. Based on the analysis of harmonics，it is concluded that the main harmonic in the synchronous coordinate system is the 6th harmonic. To suppress specific frequency harmonics，the repetitive

controller was employed. Through Simulink simulation，dynamic responses and Fourier analysis of the d-axis 

winding current were observed，confirming the effectiveness of the proposed active disturbance rejection power

decoupling control method and harmonic suppression method.

      Key words：brushless doubly-fed machine（BDFM）；power decoupling；active disturbance rejection control

（ADRC）；repetitive controller；harmonic suppression