Research Summary of Transformer DC Bias

With a large number of DC power transmission project put into operation in China,the occurrence probability of large-scale DC bias is also increasing.The current situation of the research on the DC bias of transformer in China and abroad is summarized in this paper,and the main problems in the current research are analyzed,including the generation mechanism of DC bias,the influence of DC bias on AC power grid and the principle of DC bias control and the control measures,and the key content of further research is put forward in Classification.