In the rapidly evolving landscape of energy storage, a groundbreaking study published in Zhejiang dianli, which translates to “Zhejiang Electric Power,” is set to revolutionize how lithium battery energy storage systems (BESS) operate within the grid. The research, led by ZHU Yixin from the School of Internet of Things Engineering at Jiangnan University, introduces innovative strategies that promise to enhance the stability and efficiency of BESS, paving the way for more reliable and cost-effective energy solutions.
At the heart of the study is the challenge of managing battery modules in a cascaded system. Traditionally, these modules are connected in series to form battery power modules, which then integrate into a DC grid. However, during charging, independent current control by each module controller can lead to unstable currents and diverging bus-side voltages, a problem that has long plagued the industry.
ZHU Yixin and his team have developed a series-type I-P droop control strategy that incorporates parallel droop concepts to achieve stable power distribution. This approach ensures that each module operates harmoniously, preventing the chaotic fluctuations that can occur when modules act independently.
But the innovation doesn’t stop at stable power distribution. The researchers have also introduced a proportional balancing strategy inspired by traditional methods. This strategy is designed to balance the state of charge (SOC) across the battery modules, a critical factor in extending the lifespan and performance of the energy storage system.
To further enhance the balancing speed, the team analyzed the operating points of the battery power modules and optimized the design of the voltage division coefficient. The result is an improved balancing strategy that decouples power control from balancing control, significantly reducing the time required to achieve SOC balance.
The implications of this research are profound for the energy sector. As the demand for renewable energy sources continues to grow, so does the need for efficient and reliable energy storage solutions. The ability to stabilize power distribution and balance SOC across battery modules can lead to more efficient use of energy, reduced downtime, and lower operational costs.
“Our goal was to address the fundamental challenges in managing cascaded battery modules,” said ZHU Yixin. “By achieving stable power distribution and SOC balancing, we can enhance the overall performance and reliability of BESS, making them a more viable option for grid integration.”
The study’s findings, published in Zhejiang dianli, have already sparked interest in the industry. Energy companies and researchers alike are exploring how these strategies can be integrated into existing systems to improve efficiency and reliability.
As the energy sector continues to evolve, the work of ZHU Yixin and his team at Jiangnan University is poised to play a pivotal role in shaping the future of energy storage. Their innovative approaches to power control and SOC balancing are not just academic exercises; they are practical solutions that can drive significant commercial impacts, making energy storage systems more robust and cost-effective.
The research underscores the importance of continued innovation in the field of energy storage. As we move towards a more sustainable energy future, the ability to store and distribute energy efficiently will be crucial. The strategies developed by ZHU Yixin and his team are a significant step forward, offering a glimpse into the potential of advanced energy storage technologies.
