水电能源科学

随着可再生能源大规模接入电网，抽水蓄能电站的联合运行优化成为保障电网稳定性的关键。因此，针对定-变速机组的联合运行模式，研究其动态响应特性。首先建立定-变速机组联合运行仿真计算模型，然后分析变速机组在单机和定-变速联合运行条件下对压力和转速的影响，结果表明变速机组的引入对动态响应的优化作用显著，能有效改善蜗壳压力调保质量，且缩短抽水工况转速调节时间；最后对定-变速联合运行下不同运行转速的影响做定量分析，结果发现发电工况变速机组的压力响应对运行转速变化最为敏感，调节时间显著缩短；抽水工况运行转速增大对两类机组在调节时间方面表现出明显的差异性。该研究可为抽水蓄能电站的优化设计提供一定的技术参考。

With the large-scale integration of renewable energy into the power grid, the joint optimal operation of pumped storage power stations has become crucial for maintaining grid stability. This paper focuses on the dynamic response characteristics of fixed-speed and variable-speed units during joint operation. Firstly, a simulation model for the joint operation of fixed-speed and variable-speed units was established. The effects of the variable-speed unit on pressure and rotational speed were analyzed under both individual and joint operation conditions. The results indicate that the introduction of variable-speed unit significantly improves the dynamic response, effectively enhancing the performance of pressure regulation in the spiral casing and shortening the speed regulation time during the pumping mode. Finally, the effects of different operating speeds during joint operation were quantitatively analyzed. The results reveal that in the generating mode, the pressure response of the variable-speed unit is highly sensitive to operating speed changes, leading to a significantly shorter regulation time. In the pumping mode, an increased operating speed affects the regulation times of the two-type units differently. These findings provide a technical reference for the optimal design of pumped storage power stations.