In the dynamic world of energy transmission, the quest for reliability and efficiency is unending. A recent study led by Shuaitao Bai from the Electrical and Electronic Engineering College of North China Electric Power University, Baoding, China, delves into the intricate dance of Ultra-High Voltage (UHV) AC and DC systems, offering insights that could revolutionize power grid stability and control.
The research, published in ‘Zhongguo dianli’ (China Electric Power), focuses on the operation characteristics and security control measures of a UHV AC loop network with multi-hierarchical DC infeed after a line fault. This is a complex scenario that, until now, has been a significant challenge for power grid operators. The study simulates the voltage stability characteristics of coupled AC and DC systems post-fault, and the thermal stability of the power system when large power transfers occur.
Bai explains, “The coupling strength between UHV AC and UHV DC systems, and between 1000 kV/500 kV AC power grids at the receiving end, increases significantly. This poses unique challenges and opportunities for grid stability and control.”
The research introduces a unified multi-resource co-control optimization model, which considers the sensitivity and priority of multiple control methods such as DC modulation and load shedding. This model aims to minimize the amount of security control measures needed, a critical factor in maintaining grid stability and efficiency.
The study proposes a control-cost-based heuristic optimization method of constant-step gradient descent to obtain the co-control measures. This method has been verified through simulations of an actual power grid, demonstrating its effectiveness in reducing prevention and control measures.
The implications of this research are vast. As the energy sector continues to evolve, with increasing integration of renewable energy sources and the need for more resilient power grids, the findings from Bai’s study could shape future developments in grid stability and control. By optimizing the coordination between UHV AC and DC systems, power grid operators can enhance reliability, reduce costs, and improve overall efficiency.
The research underscores the importance of advanced simulation and optimization techniques in addressing complex power grid challenges. As Bai notes, “The proposed controlling method can effectively reduce the amount of prevention and control measures, which is crucial for the reliable operation of UHV AC/DC power grids.”
This study not only advances our understanding of UHV AC/DC systems but also paves the way for innovative solutions in power grid management. As the energy sector continues to push the boundaries of technology and efficiency, research like this will be instrumental in shaping a more resilient and sustainable future.
