模型参数对变压器直流偏磁仿真结果影响的灰关联分析

Grey Relational Analysis of Model Parameters′ Impact on DC Bias Simulation Result of Transformer

直流输电单极大地回线运行时,变压器绕组将流过较大的直流电流,导致变压器出现直流偏磁。变压器直流电流的仿真计算结果对制定直流偏磁限制措施具有重要意义。介绍了变压器直流偏磁仿真典型模型及参数,分析了影响计算精度的因素,应用灰关联分析方法给出了等效直流电阻、接地电阻、土壤参数等要素与直流偏磁仿真结果的关联程度。

During monopolar operation of HVDC systems with ground return, large DC current would pass through transformer windings, which causes DC bias of transformer. The simulation results of DC current are significant to establish DC bias suppression method. This paper introduces typical simulation model of trans-former DC bias and the parameters and analyzes the factors that influence calculation accuracy. Based on the grey relational analysis, the relation of DC bias simulation results, equivalent DC resistance, ground resis-tance and soil parameter is presented.