INVESTIGATION INTO HVDC CORONA: DISCUSSION AND INITIAL MODELLING RESULTS

摘要

Corona loss in transmission lines is caused by the partial breakdown of air around the conductor and the ion flow of charged particles away from the conductor. The manifestation of corona and the impact of corona loss varies according to electrode geometry, magnitude and distribution of the electric field and composition of the gas. As such it is important to account for corona in designing transmission lines as it has an impact on number of factors including: conductor size and rating, conductor bundles, and the selection of insulation. The object of the author's research is to investigate and model corona and in particular corona loss. The paper primarily identifies relevant available research, modelling techniques and published data with which the development of a corona model can be based and compared. In this case the 2 identified methods of modelling are the flux corrected transport algorithm and the particle mesh method. These 2 methods allows for a dynamic solution and are applicable to modelling of discharges or ion flow in a gaseous system. A basic solution of the particle mesh is implemented, however the solution is inaccurate and unstable for a number of reasons.