基于电路-磁路耦合的感应型滤波换流变压器仿真与验证

感应型滤波换流变压器是一种利用变压器耦合绕组的安匝平衡作为滤波机理的变压器,为了研究其内部磁通链的耦合关系,建立电路-磁路模型很有必要。以绕组的连接方式为基础,建立了电路和电磁感应模型,以铁芯和绕组的空间几何结构为基础,考虑铁磁材料中的涡流效应,建立了磁路模型。铁芯的非线性磁阻用集总参数模型表示,并用微粒群优化(PSO)算法进行优化,最后以感应型滤波换流变压器的实际设计参数为依据,对感应型滤波换流变压器的滤波绕组接入滤波器前后的一次绕组电流和励磁电流进行了仿真对比。动模实验验证了所建模型的正确性与准确性。所建模型为感应型滤波换流变压器的阻抗设计提供了理论依据,并对正确分析感应型滤波换流变压器的运行性能具有重要意义。

Simulation and Verification of Inductive-type Filter Converter Transformer Based on Electric Circuit and Magnetic Circuit Coupled Model

It is necessary to create an electric circuit and magnetic circuit coupled model of induction-type filter converter transformer in order to study the couple relation of the magnetic flux in inner transformer.Consequently,we established a model of electric circuit and electromagnetic induction on the basis of windings connection and taking the effects of eddy current on ferromagnetic materials into consideration,put forward a formula of magnetic impedance of the core by virtue of network synthesis techniques,and optimized the network synthesis model by particle swarm algorithm.Moreover,on the basis of the practical design parameters of inductive-type filter converter transformer and the electric circuit and magnetic circuit coupled model,we simulated the exciting current and the first winding current before and after the filter winding switching on LC filters.Simulation results show that the induction-type filter converter transformer can modify the wave of exciting current and the first winding current;the simulation results are well in agreement with experiment results,showing that the model is accurate and valid.