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

Author

Listed:
  • 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)

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.

Suggested Citation

  • Li Wang & Wentao Sun & Jie Zhao & Dichen Liu, 2019. "A Speed-Governing System Model with Over-Frequency Protection for Nuclear Power Generating Units," Energies, MDPI, vol. 13(1), pages 1-18, December.
    • Handle: RePEc:gam:jeners:v:13:y:2019:i:1:p:173-:d:303553
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    References listed on IDEAS

    as
    1. Li Wang & Jie Zhao & Dichen Liu & Yi Lin & Yu Zhao & Zhangsui Lin & Ting Zhao & Yong Lei, 2017. "Parameter Identification with the Random Perturbation Particle Swarm Optimization Method and Sensitivity Analysis of an Advanced Pressurized Water Reactor Nuclear Power Plant Model for Power Systems," Energies, MDPI, vol. 10(2), pages 1-22, February.
    2. Zhe Dong & Miao Liu & Di Jiang & Xiaojin Huang & Yajun Zhang & Zuoyi Zhang, 2018. "Automatic Generation Control of Nuclear Heating Reactor Power Plants," Energies, MDPI, vol. 11(10), pages 1-18, October.
    3. Guoyang Wu & Ping Ju & Xinli Song & Chenglong Xie & Wuzhi Zhong, 2016. "Interaction and Coordination among Nuclear Power Plants, Power Grids and Their Protection Systems," Energies, MDPI, vol. 9(4), pages 1-24, April.
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    Cited by:

    1. Muhammad Saeed Uz Zaman & Muhammad Irfan & Muhammad Ahmad & Manuel Mazzara & Chul-Hwan Kim, 2020. "Modeling the Impact of Modified Inertia Coefficient (H) due to ESS in Power System Frequency Response Analysis," Energies, MDPI, vol. 13(4), pages 1-18, February.

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