A load rejection protection simulation method for pressurized water reactor nuclear power unit under different power levels

Abstract

A load rejection protection simulation method for pressurized water reactor nuclear power unit under different power levels is disclosed. Under the general simulation model of PWR nuclear power unit,Adding speed governor and steam turbine, then introducing a bypass steam control system and a quick valve closing system according to the actual situation, on the basis of which load rejection simulation tests are carried out for nuclear power units operating at multiple power levels, as a reference for load rejection tests of nuclear power units in practice; Through simulation test, verified theveracity and practicability of the PWR nuclear power unit simulation model built by the invention, At the same time, it is proved that the bypass steam control system and the fast valve system can effectively reduce the impact of load rejection on the unit, significantly improve the load rejection performance of the nuclear power unit, which is conducive to the safe and stable operation of the nuclear power unit, and the load rejection protection measures and strategies of the unit are put forward.

Description

technical field [0001] The invention belongs to the technical field of load shedding test methods, in particular to a simulation method for load shedding protection of pressurized water reactor nuclear power units at different power levels. Background technique [0002] Because nuclear power units often operate with base load, they have the characteristics of large single-unit capacity, low parameters, and easy overspeed. Once the extreme condition of load shedding island operation occurs, the safety and stability of the unit will face a greater threat. The load shedding characteristic is an important index to measure the safe and stable operation ability of the generating set. The more common organic generating set sheds the load from 100% rated power to the utility power or to no-load. In reality, nuclear power units do not all operate at full power at 100% of their rated power, and there are also operating conditions at different power levels. For example, the No. 1 uni...

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Problems solved by technology

Liao Shiwu and Zeng Kaiwen proposed dynamic simulation modeling of thermal power rapid load shedding units, the successful application of FCB function and a new realization scheme proposed by Wang Lidi and Yao Jinhuan, and the role and function of bypass steam control system for 1000MW thermal power units proposed by Feng Weizhong. A series of protective measures and simulation tests were put forward for the fast load shedding units, but these literatures were only limited to thermal power units; Wu Wenchao, Wang Ziqi et al proposed load shedding test research on AP1000 steam turbine generator sets, Zhou Xiuming, Gan Fu Research on the mathematical model of pressurized water reactor nuclear power plants suitable for analyzing the interaction between machine and network under large disturbances proposed by Lin et al., and the high-frequency problems and coordinated control measures of isolated grids under severe faults of large grids that consider nuclear power access proposed by Wang Meng and Ding Jian , Gao Huimin, Sun Rong et al. proposed Tianwan nuclear power unit dynamic model research and its response analysis to Jiangsu power grid system disturbance, and Wang Baosheng, Wang Dongqing et al. proposed real-time simulation research on steam emission control system of PWR nuclear power plant. These documents The two working conditions of nuclear power units from full load rejection to power consumption and from load rejection to no-load were studied, but no tests were conducted on nuclear power units operating at other power levels, and there was also a lack of monitoring of internal variables of nuclear power units; Zhu Jun. proposed A nuclear power plant load shedding island operation test and problem analysis, and the M310 nuclear power unit pre-commissioning preparation process research proposed by Hu Yanling, these two documents proposed the load shedding test conditions and methods for nuclear power units with multiple power levels, but did not carry out specific tests Research

At present, there is no model and related simulation data for nuclear power unit load shedding at multiple power levels, and there is also a lack of targeted research on nuclear power unit load shedding protection

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