Research on installation strategy of transformer DC bias blocking device based on artificial ant colony intelligent algorithm

In order to maximize the utilization rate as well as the economy of the Blocking Device for suppressing the DC Bias of the transformer, it is necessary to conduct a study on the optimal arrangement of the Blocking Device for substations in the region. Firstly, the DC Bias current distribution within the AC grid is obtained by calculating based on the field-circuit combination model. Secondly, by using the ACO (artificial ant colony algorithm), it can reduce the input cost of the Blocking Device as much as possible while the transformer is safe, so as to achieve the best blocking effect with the minimum number of Blocking Devices. Finally, an actual topology model based on a region in Northwest China is established for verification, and the results show that the proposed algorithm can effectively suppress the risk of DC Bias.