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Traditionally, frequency domain calculations have been restricted to the linear elements of a power system while for the representation of nonlinear components, which are a significant source of harmonics, time domain methods have been used. This paper presents a methodology for the direct harmonic domain representation of static and dynamic nonlinear elements encountered in power systems.The essential contribution of the paper is the description of a general purpose computational package which can be used by developers of programs for power system harmonic analysis. Some of the basic routines of the package, written in Fortran 77, are given. Examples of possible applications are models of transformers, of fluorescent lamps, studies of iron losses, ferroresonance and inrush currents. The dynamic modeling of arcs for electric furnaces is novel and is presented in greater detail.

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