山东电网变压器直流偏磁监测平台

结合±660 k V银东直流单极大地调试期间的实测数据,分析山东电网变压器的直流偏磁情况。在分析山东电网磁暴灾害风险及其潜在的直流偏磁影响基础上,使用MATLAB仿真软件计算2015年山东500 k V电网最大运行方式均匀电场下的GIC水平,得出具备连接线路数少、位于电网末端或拐角、连接有长线路等特征的变电站可能成为高危变电站的结论。提出构建变压器直流偏磁监测平台的思路和框架,详述该平台的在线监测流程、与外部信息的整合交换、在线计算和预警功能,为调控人员评估大电网直流偏磁风险、制定调度应急策略提供依据和支持。

DC Bias Monitoring Platform of Transformers in Shandong Power Grid

An research is done on DC bias influence of transformers in Shandong power grid by means of analyzing field-acquired data during debugging of ground return operation mode for HVDC of Yinchuan to Shandong rated ±660 kV. Based on the analysis for geomagnetic storm disaster of Shandong grid and its potential influence of DC bias, the GIC level of 500 kV power grid in Shandong is preliminarily calculated in the maximum operation by use of the uniform electric field with MATLAB simulation software. Conclusion is reached that high risk substations have characteristics of less numbers of connection lines, located at the end or corner of the power grid, long connecting lines. Ideas and frameworks for monitoring platform of DC bias are proposed. On-line monitoring process, integration and exchange of information with external environment, on-line calculating and early-warning functions are also given. The contents will offer great help for dispatch and control staff in assessing DC bias risk of large gird and formulation emergency strategy.