The integration of renewable energy sources (RES) into power systems is transforming the energy landscape, but it is also introducing new challenges related to stability and oscillations. A recent study led by Lifeng Qiu from Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd., presents a promising solution to these challenges through the innovative use of grid-forming converters (GFMCs). This research, published in the journal ‘Energies’, outlines a method for suppressing wideband oscillations that threaten the reliability of power systems increasingly reliant on power electronics.
As the reliance on traditional synchronous generators diminishes, the inherent stability they provide is lost, leading to a heightened risk of oscillations in weak grids. Qiu emphasizes the urgency of addressing these issues, stating, “The transition to a greener energy future must not compromise the reliability of our power systems. Our research aims to enhance stability through advanced control strategies.”
The study introduces an adaptive active power droop control strategy for GFMCs, which can provide flexible voltage and frequency regulation, as well as essential grid-supporting services like inertia and damping. By incorporating a first-order inertia control unit into the droop controllers, the researchers have developed a system that not only enhances transient stability but also mitigates the risks associated with wideband oscillations. This is particularly significant in the context of modern grids, where phase-locked loops (PLLs) used in grid-following converters (GFLCs) can introduce negative damping effects, exacerbating instability.
The implications of this research extend beyond technical enhancements; they hold substantial commercial potential for the energy sector. As utilities and energy providers seek to integrate more RES into their portfolios, the ability to ensure grid stability becomes paramount. This research could lead to more resilient power systems, enabling a smoother transition to renewables while maintaining reliability. Qiu notes, “By improving the stability of hybrid systems that combine GFMCs and GFLCs, we not only enhance operational efficiency but also pave the way for broader adoption of renewable technologies.”
The findings from this study are validated through rigorous simulations and experiments, providing a robust framework for future developments in power electronics. As the energy sector continues to evolve, the adaptive control strategies outlined by Qiu and his team could serve as a cornerstone for designing next-generation power systems capable of meeting the demands of a decarbonized future.
For more information about Lifeng Qiu’s work, you can visit Zhejiang Huayun Electric Power Engineering Design & Consulting Co., Ltd..
