In the quest for reliable and high-quality power supply, researchers have been exploring innovative solutions to address the challenges posed by microgrids. A recent study published in the *Journal of Harbin Institute of Technology* offers a promising approach to enhancing power quality in microgrids through advanced control of hybrid energy storage systems. Led by WANG Jia-rui from the State Grid Jilin Electric Power Research Institute, the research proposes a dual-battery system that could revolutionize how microgrids manage power fluctuations and maintain stability.
Microgrids, which are localized grids that can operate independently or in conjunction with the main power grid, are increasingly being adopted to improve energy resilience and efficiency. However, they often face issues such as voltage sags, frequency deviations, and voltage fluctuations, which can compromise power quality. To tackle these problems, WANG Jia-rui and his team have developed a control method that integrates two types of batteries: energy storage zinc bromine flow batteries and power storage lithium titanate batteries. This hybrid system is designed to provide both energy storage and rapid power delivery, ensuring a stable and high-quality power supply.
The researchers employed a two-stage control strategy, using DC/DC and DC/AC converters to manage the hybrid energy storage system. The DC/DC converter control is based on the nature of power fluctuations and employs constant current fast charge control, while the DC/AC converter uses PQ control and an improved droop uniform frequency control method. This sophisticated control algorithm allows the system to automatically switch between different operating modes, effectively addressing power quality issues such as voltage sags, frequency deviations, and voltage fluctuations.
“Our research demonstrates that the hybrid energy storage system can significantly improve the main electric energy indices of the microgrid, surpassing national standards,” said WANG Jia-rui. “This technology not only enhances power quality but also ensures the reliability and efficiency of microgrid operations.”
The study also included a simulation model of an actual microgrid to validate the proposed control method. The results showed that the system effectively met the power quality requirements, providing a robust solution for microgrid operators.
The implications of this research are far-reaching for the energy sector. As microgrids become more prevalent, the need for advanced control systems to manage power quality will grow. The hybrid energy storage system proposed by WANG Jia-rui and his team offers a viable solution that could be adopted by energy providers to enhance the performance of their microgrids. This technology could also pave the way for further innovations in energy storage and power management, ultimately contributing to a more stable and efficient energy infrastructure.
In the words of WANG Jia-rui, “This research is a step towards achieving a more resilient and high-quality power supply for microgrids, which is crucial for the future of the energy sector.” As the energy landscape continues to evolve, such advancements will be essential in meeting the growing demand for reliable and sustainable power.