Abstract
This paper presents the transient stability analysis of a pressurised water-type nuclear power plant following faults and disturbances affecting the electricity grid to which it is connected. The modelled nuclear plant consists of various integrated subsystems, such as core neutronics and thermal-hydraulics, piping and plenum, pressuriser, steam generator, turbine, governor, and dynamics shaft, in addition to the turbine-speed controller. The nonlinear nuclear power plant model is linearised at the operating point to acquire a linear model for controller design. The turbine-speed control loop effectively enacts a closed-loop implementation of the nuclear power plant connected to the electric grid. The various transient stability enhancement components such as the power system stabiliser, static var compensator, and static synchronous compensator are employed to test performance during severe contingencies. The interaction between the nuclear power plant, electric grid, and protection system is studied under various scenarios such as single-phase fault, three-phase fault, and permanent load loss. The performance of the nonlinear plant is further observed during load-following operation. The dynamic behaviour of the overall system is analysed using simulations in the MATLAB/Simulink/Simscape environment.
Highlights
The response of nuclear power plant variables in the cases of generic PSS (GPSS) and Static var compensator (SVC) is unable to damp the oscillations after fault clearing, which may severely affect the performance of the plant during recurring fault conditions
The transient analysis of a simulated pressurised water-type nuclear power plant connected to a faulted electric grid was presented in this work
The interactions between the nuclear power plant, the electric grid, and protection systems were studied under various scenarios including multiple single-phase faults, multiple three-phase faults, and the permanent load-loss events affecting the electricity grid
Summary
The various subsystems of the integrated model have been considered in depth in [16,23,24,25]. The integrated model has been analysed and verified with simulated as well as plant data in [26]. A dynamic shaft model has been further incorporated in the integrated model [27]. To avoid duplication of published work, the PWR-type nuclear power plant model is presented here in brief. The values of plant parameters, steady-state values, and their detailed definitions are given in [26,28,29]
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