In the heart of China’s energy infrastructure, a significant stride is being made to bolster the security and stability of power grids, particularly in the Jiangsu region. Zhiguang Huang, a researcher at the East China Branch of State Grid Corporation of China, has spearheaded a groundbreaking study published in ‘Zhongguo dianli’ (China Electric Power). The research delves into the intricate world of hybrid multi-infeed DC systems, a technology that combines line commutated converters (LCC) and modular multilevel converters (MMC) to enhance power transmission efficiency and reliability.
The study, which focuses on the receiving-end power grid in Jiangsu, reveals critical insights into the current state of the grid’s security and stability. Huang and his team identified seven key evaluation indexes to quantify these aspects, and their findings are both enlightening and alarming. “The most serious problem we found is the commutation failure of the DC system,” Huang explains. This issue, if left unaddressed, could lead to significant disruptions in power supply, affecting both industrial operations and everyday life.
To tackle these challenges, the researchers proposed two innovative schemes. The first involves replacing the inverter-side LCC of the Binchang DC system with an MMC. The second scheme is even more ambitious: constructing a multi-terminal DC system primarily based on MMC technology. Both solutions aim to enhance the grid’s resilience and stability, ensuring a more reliable power supply.
The implications of this research extend far beyond Jiangsu. As the demand for electricity continues to grow, so does the need for robust and efficient power transmission systems. The findings from Huang’s study could pave the way for similar improvements in other regions, both within China and globally. The commercial impact is substantial, as industries dependent on a stable power supply can operate more efficiently, reducing downtime and increasing productivity.
The study’s evaluation method, which quantitatively assesses the security and stability of the receiving-end power grid, is a significant contribution to the field. It provides a framework that can be applied to other power grids, helping energy providers identify and address potential vulnerabilities. “Our evaluation method not only highlights the current issues but also provides a roadmap for future improvements,” Huang notes.
As the energy sector continues to evolve, the integration of advanced technologies like MMC in power grids will be crucial. Huang’s research underscores the importance of continuous innovation and evaluation in maintaining the reliability and efficiency of power systems. With the insights gained from this study, the future of power transmission looks brighter and more stable, ensuring that the lights stay on and industries thrive.