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Analysis of Electromagnetic Characteristics of Controllable Devices in HVDC Converter Station

The controllable device is one of the equipments that are most affected by electromagnetic field. This paper mainly studies the electromagnetic interference (EMI) between controllable devices in the converter station. Taking the thyristors on the rectifier side of ± 800 kV/10 000 MW HVDC as an example, firstly, the paper analyzes the operation characteristics of a single thyristor on the rectifier side. And the du/dt and di/dt are calculated when the thyristor switches based on the actual circuit. Secondly, the relevant converter station valve tower model is established based on the thyristor model which is built in the Ansys environment. And the influences of EMI generated by the thyristor on different thyristors during the turn-on and turn-off process are analyzed by the combined field and circuit simulation method. It is also pointed out that the EMI may cause the device to be misconducted under certain conditions, and the corresponding suppression measures are given. Then the distribution characteristics of the valve tower are analyzed. The research in this paper can provide a reference for the analysis and design of HVDC converter stations.