A Speed-Governing System Model with Over-Frequency Protection for Nuclear Power Generating Units

Li Wang, Wentao Sun, Jie Zhao and Dichen Liu
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Li Wang: Hunan Province Key Laboratory of Smart Grids Operation and Control, School of Electrical & Information Engineering, Changsha University of Science & Technology, Changsha 410114, China
Wentao Sun: Economic & Technology Research Institute, State Grid Jiangsu Electric Power Company, Nanjing 210008, China
Jie Zhao: School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China
Dichen Liu: School of Electrical Engineering and Automation, Wuhan University, Wuhan 430072, China

Energies, 2019, vol. 13, issue 1, 1-18

Abstract: Overspeed is more likely to occur in the process of load rejection or large disturbances for nuclear steam turbines due to the large parameter range and low steam parameters, as well as the power of the low-pressure cylinder accounting for a high proportion of the total power. It is of great significance to study the overspeed characteristics of nuclear power plants (NPPs) to ensure the safe and stable operation of the unit and power grid. According to the characteristics of NPPs, the overspeed protection model and the super-acceleration protection model were established, which were added to the speed-governing system model. The response characteristics of the reactor, thermal system, steam turbine and speed-governing system in the process of load rejection or large disturbances of the power grid were analyzed and simulated. The results were compared using the simulation software personal computer transient analyzer (PCTRAN). The simulation results showed that quickly closing both the high and medium pressure regulating valves could effectively realize frequency control when load rejection or a large grid disturbance occurred. The over-acceleration protection cooperates with the super-acceleration protection to avoid the repeated opening/closing of the valves due to overspeed protection. This could effectively reduce the impact of large disturbances on the reactor, thermal system, and turbine.

Keywords: nuclear power unit; reactor and thermal system; overspeed protection; super-acceleration protection (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2019
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (1)

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