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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 k V. Based on the analysis for geomagnetic storm disaster of Shandong grid and its potential influence of DC bias, the GIC level of 500 k V 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.