多泵并联给水系统给水泵切换运行规律仿真研究

多泵并联给水系统作为核动力系统的主要子系统之一，其给水泵的切换运行规律对系统运行经济性以及系统运行特性至关重要。本研究利用系统仿真支撑软件APROS建立了多泵并联给水系统仿真模型，并依据额定设计值验证了模型的准确性。基于此，通过进行不同切换条件下的线性升、降负荷仿真，对给水泵切换运行规律和系统动态特性进行了研究。研究结果表明，针对本研究对象，其高负荷工况切换点选取为70%额定流量，低负荷工况切换点选取为30%额定流量时，既能获得良好的系统动态响应，还能保持给水泵运行经济性较高。此外，低负荷工况对给水泵切换引入的扰动更为敏感。低负荷工况下，若切换条件选取不当，则会导致降负荷过程中系统触发超压排放。

Simulation Study on Switching Operation Law of Feed Water Pumps in Multi-pump Parallel Feed Water System

As one of the main subsystems of the nuclear power system, the switching operation law of the feed water pumps in the multi-pump parallel feed water system is critical to the system operation economy and system operation characteristics. In this study, the simulation model of multi-pump parallel water supply system is established by using the system simulation support software APROS, and the accuracy of the model is verified according to the rated design value. Based on this, the switching operation law and system dynamic characteristics of feed water pump are studied through the simulation of linear rising and falling load under different switching conditions. The research results show that, for this research object, when the switching point under high load condition is selected as 70% of the rated flow, and the switching point under low load condition is selected as 30% of the rated flow, good system dynamic response can be obtained, and high economy of feed water pump operation can be maintained. In addition, the low load condition is more sensitive to the disturbance caused by the switching of feed water pump. Under low load conditions, if the switching conditions are not selected properly, the system will trigger overpressure discharge in the process of load reduction.