Compatibility among Electrical Network Component Models of Computational Power System Analysis Programs

Abstract

This work describes the procedures and developments required to make the transformer and transmission line (TL) models of the HarmZs program (a CEPEL’s production grade software for harmonic frequency analysis of electrical power systems) and the Alternative Transients Program – ATP (for time simulation of electromagnetic transients) compatible. For the transformer models, the compatibility is accomplished by manual correction of the short-circuit impedance data in the ATP as a function of the tap positions. In the HarmZs, this correction is automatically carried out. For the compatibility of TL models, it was necessary the theoretical development of the frequency equivalent of the widely used ATP’s Bergeron transmission line model. For its implementation in the HarmZs code, it was necessary to determine its nodal admittance matrix. Besides the theoretical development, results are presented regarding a medium-sized transmission system, showing the differences between the Classical and Bergeron transmission line models in the HarmZs and the agreement between the two programs when the models are matched.