Virtual Simulation And Control For Operation Of Nuclear Power Plant

Pressurizer is the important equipment in the primary loop of nuclear power plant. Its basic function is to control the pressure of primary system and to provide overpressure protection. The pressure control system of steam pressurizer is researched deeply in this paper. In addition, a three-dimensional scene simulation system of nuclear power plant is established to master the operation situation of the entire nuclear power plant system intuitively and conveniently. The main content is to virtually simulate the running states of nuclear power plant and the pressure control process of pressurizer.The dynamic characteristic of nuclear steam pressurizer under±10% load disturbance is studied in this paper. Firstly, a nonequalibrium three region pressurizer thermodynamics model is built, and its differential equation adopts four rank Runge-Kutta method to solve. Then, traditional PID controller and single neuron self-adaptive PID controller are designed to control primary system pressure. The simulation program of pressure control system is compiled by using Visual C++. Comparing the simulation results of two controllers, it shows that the stabilization time of single neuron self-adaptive PID control is shorter than that of traditional PID controller, and the overshoot is much less. So it leads to the conclusion that the control effect of single neuron self-adaptive PID controller is better than that of traditional PID controller.Three-dimensional models used for nuclear power plant virtual simulation are created by using MultiGen Creator. The interactive application program is compiled with API functions in order to establish a three-dimensional scene simulation system of nuclear power plant based on Vega. It is necessary to design multiple observational viewpoints in the scene simulation system for observing every equipment expediently. Multifarious virtual effect should be designed to virtually simulate the running states of nuclear power plant. Through the output of virtual effect which is carried out by Special Effect module of LynX graphical user interface and Vega programme, the pressurizer pressure control process is verified intuitively. According to the result, it is indicated that the pressurizer pressure control system is designed properly and it has great control effect.