| In this paper, the mathematical models of electric elements, such as transmission line, transformer, generator and load, are studied and established. A practical computation method for asymmetry harmonic (foundmental) power flow and harmonic impendance is presented. The mathematical model and design method for passive power filter is also established. in hybrid filter systems is established. Then a unified software package for asymmetry harmonic / foundmental power flow calculation, harmonic impedance calculation and filter design has been developed in Chinese Windows environment by using digital simulation technology and visualization technology. At last, a 6-bus test system and a local power grid of Taiyuan are calculated and discussed, which gets satisfied results.
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