In the dynamic world of energy, the quest for operational efficiency and flexibility in power generation is a never-ending pursuit. This is particularly true for coal-fired power plants, which remain a significant part of the global energy mix. A recent study published in Zhongguo dianli (China Electric Power) sheds light on how these plants can enhance their performance during critical moments of grid stability. The research, led by Tao Lun of the Electric Power Dispatching and Control Center, State Grid Corporation of China, delves into the intricacies of primary frequency regulation in a 660 MW supercritical coal-fired power plant.
Primary frequency regulation is a crucial mechanism that helps maintain the stability of power grids. When there is a sudden imbalance between power supply and demand, the frequency of the grid can fluctuate. To mitigate this, power plants must quickly adjust their output. Lun and his team explored four different regulation schemes to understand their impact on the plant’s efficiency and flexibility.
The study, which utilized the GSE software to develop a dynamic model of the power plant, revealed some fascinating insights. During the primary frequency regulation process, the output power of the steam turbine and the total efficiency of the power plant increased sharply across all four schemes. Conversely, the standard power generation coal consumption rate decreased. This inverse relationship is a testament to the plant’s ability to optimize its performance under stress.
One of the key findings was the role of heat storage in the boiler and steam turbine systems. Lun explained, “The basic reason for those four schemes eligible to participate in primary frequency regulation is explained as the heat storage reduction of both the boiler and steam turbine systems.” This reduction in heat storage allows the plant to respond more quickly and efficiently to changes in demand, thereby enhancing grid stability.
The research also identified the most effective regulation scheme. When the scheme of throttling extraction steam from high-pressure heaters was applied with a primary frequency regulation time duration set as 90 seconds, the deviation from the average standard coal consumption rate hit a minimum value of −22.15 g/(kW·h). This scheme not only improved efficiency but also reduced coal consumption, making it a commercially attractive option for power plant operators.
The implications of this research are far-reaching. As the energy sector continues to evolve, the need for flexible and efficient power generation becomes increasingly important. Lun’s findings provide a roadmap for coal-fired power plants to enhance their operational flexibility, which is crucial for integrating renewable energy sources into the grid. By improving their response to frequency regulation, these plants can play a pivotal role in maintaining grid stability and reliability.
This study, published in Zhongguo dianli, offers a glimpse into the future of coal-fired power generation. As the energy landscape continues to shift, the ability to adapt and optimize performance will be key to the survival and success of these plants. Lun’s research not only contributes to the scientific understanding of primary frequency regulation but also provides practical insights that can be applied in the field. The energy sector is poised for significant developments, and studies like this will undoubtedly shape the future of power generation.