Study on nuclear power plant dynamic response characteristics and impact of power quality problems

Nuclear power plant (NPP) generally has large capacity, high security requirements, and is sensitive to external disturbances. Integrating NPPs into power system will result in stability problems in all aspects. This paper established the model of pressurized water reactor (PWR) NPP, and then the reactivity disturbance and power regulation characteristic were simulated and analyzed. The dynamic response characteristics of NPP were verified and analyzed. The frequency and voltage disturbances were analyzed, and the control strategies of security and stability were summarized. The analysis results show that, NPP has the characteristics of self-stabilization and self-regulation, and NPP will be affected by power system disturbances. If the disturbances can be cleared quickly, the NPP and power system can remain stable. NPP requires higher operating conditions on power system such as voltage and frequency. The amplitude and rate of NPP power regulation are limited. The grid and NPPS should take effective measures to ensure safe and stable operation.