基于多线圈耦合的新型换流变压器仿真模型设计

Simulation Model's Design of a New Converter Transformer Based on Multi-Coil Coupling

为研究新型换流变压器正常运行、内外部故障、铁心饱和时的电磁暂态瞬变过程及电气量的变化规律、开发配套的新型换流变压器保护方案,有必要设计新型换流变压器仿真模型进行相关的研究。文章基于互相耦合的概念,建立了新型换流变压器的多线圈耦合模型,在此基础上,根据新型换流变压器特殊的接线方式,结合有限元仿真软件,采用Matlab里的多线圈耦合模块分别设计了正常状态和发生内部故障时的新型换流变压器仿真模型,并设计了非线性电感支路来模拟新型换流变压器铁心饱和特性,仿真结果证明了本文所建仿真模型的正确性。本文设计的新型换流变压器仿真模型物理概念清晰,设计过程简单,计算精度较高。该种仿真模型设计方法能用于实际工程中任意复杂多绕组变压器的正常状态、内外部故障以及励磁涌流仿真建模与分析。

In order to study the electromagnetic transient course and electric parameter＇s variation rules when the new converter transformer operates under normal or all kinds of external and internal faulty and saturated core conditions,develop suitable protection schemes for the new converter transformer,it is essential to design simulation models to research accordingly.Based on the coupling concept,according to the special winding wiring mode of the new converter transformer,with a finite element simulation software,multi-coil coupling module of Matlab is used to design the normal and internal faulty simulation model of the new converter transformer separately,and a nonlinear inductance branch is designed to simulate the characteristic of saturated core of the new converter transformer.The correctness of the simulation models designed by this paper are verified by simulation results.The physical concept of the simulation models designed by this paper is very clear and the designing course is simple.The calculation precision is comparative high,and the methods which designing the simulation model of the new converter transformer can be used to design and analyze normal,external and internal faulty and inrush current simulation models of arbitrary complex multi-winding transformers in actual projects.