In a significant advancement for the wind energy sector, researchers have unveiled a novel wind energy conversion system that leverages a doubly-fed induction generator (DFIG) enhanced by a transformerless series grid side converter. This innovative approach addresses critical challenges posed by grid disturbances, such as voltage sags and unbalanced conditions, which can lead to inefficiencies and equipment damage.
Lead author Ítalo A. Cavalcanti de Oliveira from the Post-Graduate Program in Electrical Engineering (PPgEE) – Federal University of Campina Grande (UFCG) in Brazil emphasizes the importance of this research, stating, “Our system not only protects the generator from over-current and rotor over-speed but also enhances the overall reliability of wind energy systems in challenging grid conditions.”
The proposed system employs a series grid side converter that compensates for distorted stator voltages, ensuring that the rotor operates within safe limits. This capability is crucial as it prevents over-voltage occurrences in the DC link and mitigates double-frequency oscillations in the electromagnetic torque, which can lead to mechanical failures. By maintaining stability during voltage sags, the system also allows for the injection of reactive power, a feature that can bolster grid support during critical periods.
The commercial implications of this research are substantial. As the demand for renewable energy sources grows, ensuring the reliability and efficiency of wind energy systems becomes paramount. This technology could lead to more robust wind farms that can operate effectively under a wider range of conditions, ultimately contributing to energy security and sustainability.
Cavalcanti de Oliveira’s team has validated their approach through rigorous simulations and experimental results, demonstrating its practical viability. “The results show that we can significantly improve the performance and resilience of wind energy systems,” he adds, highlighting the potential for widespread adoption in the industry.
This research was published in ‘Eletrônica de Potência,’ or ‘Power Electronics,’ marking a pivotal moment in the ongoing evolution of renewable energy technologies. As the energy sector continues to adapt to the challenges of climate change and grid reliability, innovations like this one will play a crucial role in shaping a more sustainable future.
