Multiphysics Coupling Analysis And Structural Optimization Design Of Isolated Phase Enclosed Busbar In Nuclear Power Plant

As a clean and efficient green energy,nuclear power will play an important supporting role in China’s energy structure and is of great significance for China to achieve the strategic goal of "carbon peaking and carbon neutral".Isolated phase enclosed busbar is an important connection line between the generator set and transformer of the nuclear power plant,with an operating current of tens of thousands of amperes and a very complex structure.In this thesis,the following studies were conducted on the electromagnetic,thermal,and force field analysis and structural optimization of the isolated phase enclosed busbar in a nuclear power plant:First,the finite element model of the electromagnetic field and eddy current loss of the isolated phase enclosed busbar is studied.A three-dimensional model of the isolated phase enclosed busbar is established based on an outlet end of a nuclear power plant,and a finite element method is used to simulate and analyze the electromagnetic field of the busbar to obtain the distribution of the electromagnetic field of the isolated phase enclosed busbar and the electromagnetic loss mainly due to eddy current loss.Second,the finite element model of the temperature and force fields of the isolated phase enclosed busbar is studied.A multi-field coupling analysis method is proposed for the whole section of the isolated phase enclosed busbar,and the coupling relationship between the three physical fields is fully considered.The three-field bidirectional coupling simulation of the electromagnetic field,thermal field,and force field of the busbar is combined with the electromagnetic simulation results,and the temperature field distribution and force situation of the isolated phase enclosed busbar are obtained.Third,on the basis of the coupled simulation results,the structural parameters of the isolated phase enclosed busbar are optimized.In the first optimization scheme,the busbar parameters are optimized by the response surface method combined with the finite element method;in the second optimization scheme,the beetle antennae search algorithm is improved according to the differential evolution strategy and the quadratic interpolation method,and the busbar parameters are optimized by the improved beetle antennae search algorithm.The effectiveness of the simulation method is verified by comparing the experimental results of busbar temperature measurement with the simulation results.Finally,the best optimization scheme of the busbar is obtained by comparing the economics of the two schemes.Fourth,a remote monitoring and warning system for the isolated phase enclosed busbar is designed.According to the actual monitoring needs of the isolated phase enclosed busbar operation,the electric power Internet of Things technology is adopted,and the functions of data monitoring,data transmission,and human-machine interaction are realized through the design of the sensing module,communication module and user interface based on the modular idea,which provides a strong guarantee for the reliable operation of the isolated phase enclosed busbar.