基于有限元的场路模型在变压器直流偏磁中的应用

摘要

Computation of three-dimensional electromagnetic model of DC-biased transformer is a hot topic nowadays.A magnetic-circuit coupled method is proposed in this paper.The system response equation to transient excitation is deduced according to the field-circuit model.Finite element method is applied to magnetic numerical calculation,and the solution is fed back into circuit.An actual model of transformer has been built up.Simulation and case study are given to verify the effectiveness and stability,which provide the basis for modeling and analysis of power and current transformers.%变压器直流偏磁三维电磁场的数值计算是备受关注的前沿课题。文中提出场路模型的分析方法,建立变压器电磁场模型,推导瞬态激励下的系统响应方程。运用有限元进行电磁场数值分析,并将计算结果反馈电路系统。通过实际单相变压器建模,进行负载和空载数值计算,并成功仿真直流偏磁问题,结果验证场路方法的合理性和有效性,通过总结其规律,为大型电力变压器暂态建模分析提供依据。