Research On DC Magnetic Bias And Its Restraining Measures For A ±500kV Converter Station

The safe and stable operation of substations is an important guarantee for human living and social development.In order to ensure the safe operation of substations,research on the influence of DC bias and put forward effective suppression measures have important theoretical guidance and engineering practice values.The causes and hazards of the DC bias generated by converter transformers are described.Combined with a ±500 kV converter station,various measures to suppress the influence of DC bias are analyzed.Direct device to suppress DC bias magnetic solution.Finally,technical analysis was performed on the application effect of the installation of a capacitor-blocking and direct-separation device at the converter station,and the impact on the conversion and control protection was analyzed.Through the testing and analysis of the system,the effectiveness of the measures was verified through actual The results of the operation prove the validity and rationality of the proposed method.