核能水电联产系统的变负荷动态特性与灵活运行控制策略优化研究

To accommodate the large scale renewable power combined to the grid, participation of nuclear power units in peak shaving becomes a trend. However, frequent adjustment of reactor power affects the operational safety and economy of nuclear power units. Power and water cogeneration and power control strategy optimization were proposed to enhance the operational flexibility of nuclear power units. The variable load Performance under different variable load rates of l%-5%FP/min was dynamically simulated in combination with the case nuclear power unit. In addition, the center temperature deviation of the fuel rods during the variable load process was quantitatively analyzed. Results show that the proposed coupling power control strategy can achieve flexible adjustment in the variable load ränge of 65%FP to 90%FP, which improves the operational flexibility of the power and water cogeneration integrated System. Further-more, the füll load Operation of the reactor is maintained during the variable load process, which reduces the frequent movement of the control rods and improves the operational safety of the reactor. Compared to the original power control strategy, the coupling power control strategy reduces the ränge of fuel rod Center temperature deviation by 41. 24% to 45. 28% during variable load process, reducing the alternating stress experienced by the fuel rod cladding, thereby improving the life of fuel rod cladding and the safe and stable Operation of nuclear power units.