Co-simulation System Construction And Controller Design Of Nuclear Power Plant

In order to ensure the safety and stability of nuclear power plants and avoid major accidents,it is necessary to conduct simulation analysis on them in advance.RELAP5 is the best estimation program for the transient behavior of the light water reactor cooling system accident conditions covering the transient analysis of the entire light water reactor system,which is widely used in the simulation of nuclear power plants.However,the RELAP5 program cannot conduct simulation analysis on complex control systems.The human-machine interface and storage of simulation results are not perfect enough.Therefore,this paper designs a cosimulation system based on the platform of the RELAP5 and MATLAB whose data interaction is realized by the application of SOCKET.My SQL database realizes the function of storing simulation data.In addition,it also designs the client interface to improve the attributes of human-machine interaction.Using the co-simulation system to realize the fuzzy control algorith which verifies the practicability and scalability of the system.This paper firstly analyzes the structure of the primary circuit of the nuclear power plant and builds the modelling of the key equipment of the primary circuit.Referring to the model parameters of Qinshan Nuclear Power Station,the primary loop models are built by RELAP5 program and the steady-state verification calculation is carried out on the model.The data interaction between RELAP5 and MATLAB is designed based on SOCKET whose communication is carried out by UDP protocol.The data receiving and sending on the terminal of RELAP5 and MATLAB are processed respectively.My SQL database is used to store simulation results and add indexes to some fields to increase the query speed.The front-end interface of the simulation system based on Qt is designed,including functions such as user login,visual modification input,running or terminating the program,and simulation result analysis.In order to achieve remote access to the database,the WEB server based on HTTP protocol is designed.When entering a URL in the browser,it can remotely access the simulation results and use multi-threading technology to optimize the WEB server.The controller in RELAP5 is implemented in SIMULINK and a real-time interaction method between SIMULINK and Base Workspace of MATLAB is designed.The simulation results verify the practicability of the co-simulation system.The well-designed co-simulation system,which designs the steam generator water level controller based on the fuzzy control algorithm,is used to verify the effect under the conditions of increasing load and decreasing load condition,which can reflect both the practicability and scalability of the co-simulation system.