An algorithm for the semi-analytical computation of fields emitted in layered ground by HVDC electrodes

For the design of HVDC ground electrodes it is of the utmost importance the availability of reliable and fast numerical tools, to evaluate both the fields and corrosion risk of nearby structures. Among the used algorithms, the Complex Images Method is well-known. However such method is often based on Prony's interpolator, which may show poor convergence properties, or even instability in particularly ill-conditioned cases. In this paper the use of a substitute interpolator, efficiently solving these drawbacks, named GPOF (Generalized Pencil Of Functions) is presented and results are discussed.