In the dynamic world of energy systems, the integration of renewable energy sources has become a critical focus for researchers and industry professionals alike. A recent study published in the journal ‘Zhejiang dianli’ (Zhejiang Electric Power) sheds light on a novel approach to enhance the stability of weak power grids, a persistent challenge in the energy sector. Led by LI Qun from the Electric Power Research Institute of State Grid Jiangsu Electric Power Co., Ltd., in Nanjing, China, the research introduces an optimal allocation strategy for grid-forming (GFM) and grid-following (GFL) converters, aiming to bolster transient voltage stability.
The hybrid integration of GFM and GFL converters leverages the strengths of both voltage sources (GFM) and current sources (GFL). However, in weak power grids, the transient period of GFL inverters can be prone to voltage instability due to the phase-locked loop (PLL). This instability can disrupt the smooth operation of the grid, leading to potential blackouts and significant economic losses. LI Qun and his team delve into the root causes of this instability and propose a groundbreaking solution.
“By strategically allocating GFM inverters as internal voltage sources within new energy stations, we can ensure that GFL inverters maintain stability during transient conditions,” explains LI Qun. This approach not only leverages the voltage support of GFM inverters during the initial transient phase but also utilizes the voltage support of GFL inverters during the stability phase. This dual-support mechanism enables new energy stations to provide active, rapid, and effective support for transient voltage stability.
The study’s findings have far-reaching implications for the energy sector. As renewable energy sources become increasingly prevalent, the need for stable and reliable power grids becomes more critical. The proposed optimal allocation strategy could revolutionize how energy systems are designed and operated, ensuring that transient voltage stability is maintained even in the weakest of grids.
The research team validated their strategy through simulations of hybrid GFM and GFL converter integration systems, demonstrating its effectiveness and practicality. This validation paves the way for future developments in the field, encouraging further research and implementation of similar strategies in real-world scenarios.
The commercial impact of this research is substantial. Energy providers can enhance their grid stability and reliability, reducing the risk of blackouts and ensuring a more consistent supply of power. This, in turn, can lead to cost savings and improved service quality, making energy systems more resilient and efficient.
The study, published in ‘Zhejiang Electric Power’, represents a significant step forward in the quest for stable and reliable power grids. As the energy sector continues to evolve, the insights provided by LI Qun and his team will undoubtedly shape future developments, driving innovation and ensuring a more robust energy infrastructure for all.
