A Time-Efficient Method for the Simulation of Ion Flow Field of the AC-DC Hybrid Transmission Lines

The ac-dc hybrid transmission line is an effective way to enhance the transmission capacity of a power corridor. However, the corona discharge of ac and the dc transmission lines may interact with each other, which makes the electric field at the ground level difficult to be predicted. This paper presents a simulation method for the calculation of the field effects caused by the corona activities of hybrid ac-dc transmission lines. This approach can simulate the convection and recombination of the space charge generated by ac or dc corona without improper simplifications, and the conductor surface gradient strictly kept to the onset value. The calculated electric field and ion current density at the ground level agree well with the measurement results of a hybrid line model.