双馈并网风力发电机在电压型次同步振荡下的功率稳定策略

As the penetration of renewable energy increases, the risk of sub-synchronous oscillations (SSOs) in grid-connected systems rises, with increasingly complex causes. When SSO occurs, an effective suppression strategy is urgently needed to maintain stable output power for doubly-fed induction generators (DFIG) in wind farms. This paper begins by examining the SSO case at the Hornsea offshore wind farm in the UK, analyzing the impact of voltage oscillations on output power fluctuations and highlighting the limitations of suppressing only current oscillations under voltage-type SSO. To enhance the stability of DFIG output power amid varying SSO characteristics, a suppression strategy combining direct power control with enhanced linear active disturbance rejection control (ELADRC) is proposed. Finally, simulation models and an experimental platform are used to construct variable SSO environments, verifying the effectiveness of the proposed DFIG SSO suppression strategy.