Modeling and Dynamic Analysis of Nuclear Power Plant Reactor Based on PSASP

Abstract

In this paper, we propose a dynamic mathematical model for nuclear power plant (NPP) reactor, and give an implementation in Power System Analysis Software Package (PSASP) through a user-defined program. NPP is modeled with a bipartite model that consists of the neutron dynamics module and thermodynamics module. Through the simulation results of NPP reactor under different disturbances, a conclusion can be drawn that the temperature effect and poisoning effect are crucial to the self-stability of reactor, which is not only the basis of safe operation of the nuclear power plant but also the aim of the designing. The simulation validated the proposed NPP reactor model, and it can be packaged with the other parts of the NPP detailed model in PSASP for further usage in dynamic calculation of the power system. Index Terms—NPP reactor, modeling, self-stability, PSASP. modified and new codes need to be added and debugged carefully via the compute languages which is used for the implementation. In this paper, a reactor model suitable for the high-dynamic analysis was proposed, in which the constant pressure sta- bilized was simplified, and the fuel/coolant temperature ef- fect and poisoning effect were considered to model the true characteristics of reactor more accurately. And we give an implementation of the proposed model in PSASP, a mature and powerful software for steady-state/transient/small-signal stability analysis. Although there is a mature database of models for nearly all electrical devices for PSASP, nuclear unit model is still lacking in the available commercial power system simulation software. And the reactor model can be packaged in the PSASP with the other parts of the NPP models to complete the database. And it can be easily invoked by other researchers for diverse dynamic analysis without modifying the existing program or adding new codes. Based on the program, the basic characteristics of the reactor were studied.