基于场路耦合方法的直流偏磁仿真研究

Research on DC Bias Simulation Based on Field-circuit Coupling Method

摘要:

介绍了使用场路耦合的思路对电力系统直流偏磁进行仿真计算的方法。采用电磁场模型对大地土壤进行分 层建模，使用电路等效方法建立直流近区电网中线路、变压器等设备模型，并采用关键节点自由度耦合的方法实现了 场路模型的耦合仿真分析。最后，使用该方法对四川电网实际生产中出现的一次直流偏磁试验进行了建模仿真，反 演了试验结果，证明了该方法的有效性。

Abstract:

A field － circuit coupling method is introduced to calculate DC bias in power system． The electromagnetic field model is adopted to build the hierarchical modeling of earth soil． The models for lines，transformers and other equipment in DC neighboring grid are established with the equivalent circuit method． The degree freedoms of key nodes are coupled in order to implement the field － circuit coupling． Finally，this modeling method is used to calculate DC bias in Sichuan power grid，and the test results are inversed which are approximate with the simulation results． It proves the effectiveness of the proposed field － circuit coupling method． Key words: field － circuit coupling;