In a significant advancement for the wind energy sector, researchers have proposed a novel control strategy aimed at tackling the persistent issue of subsynchronous oscillations (SSO) that can destabilize grid-connected direct-drive wind turbines. Led by Ren Beilei from the School of Electronics and Information at Xi’an Polytechnic University, this study introduces an improved linear active disturbance rejection control (LADRC) method that promises to enhance the stability of these systems, particularly in weak grid environments.
As the demand for renewable energy sources continues to rise, the integration of wind power into existing electrical grids poses unique challenges. One of the most critical issues is the potential for SSO, which can lead to significant fluctuations in power output and voltage levels. Ren Beilei notes, “Our research demonstrates that by replacing the traditional inner loop PI controller with an improved LADRC, we can significantly mitigate these fluctuations, leading to a more stable and reliable energy supply.”
The study reveals that the enhanced LADRC can reduce DC side voltage fluctuations by an impressive 85% and active power fluctuations by 89%. These improvements are crucial for energy providers who strive to maintain grid stability while increasing the share of renewable energy in their portfolios. The implications are profound: a more stable grid connection can facilitate the broader adoption of wind energy, making it a more attractive option for investors and policymakers alike.
The research also delves into the development of an impedance model that accounts for frequency coupling effects within the system. By employing the Nyquist criterion, the team was able to assess how varying line impedance values impact the stability of grid-connected converters. This detailed analysis provides a foundation for future innovations in control strategies that could further refine the integration of wind power into the grid.
The findings of this study, published in ‘发电技术’ (translated as ‘Power Generation Technology’), highlight the importance of advanced control techniques in overcoming the challenges posed by renewable energy sources. As the energy sector moves towards a more sustainable future, such research not only enhances the operational efficiency of wind turbines but also contributes to the overall resilience of the electrical grid.
For more insights into this groundbreaking work, you can visit Ren Beilei’s affiliation at Xi’an Polytechnic University. This research serves as a beacon for future developments in the field, potentially paving the way for more robust and adaptable energy systems that can support the growing reliance on renewable sources.
