Modeling electromagnetic emission and susceptibility problems in power transmission-line networks

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Increasing demand for high-quality and reliable electric power, as well as the advent of new broadband data transmission technologies that employ the electric-power infrastructure have raised important Electromagnetic Compatibility (EMC) issues. EMC specialists are essentially concerned with two problems involving power transmission and distribution systems: undesired electromagnetic emissions, and susceptibility to external sources of electromagnetic energy. Firstly, transmission of broadband data, such as Internet, over unshielded low- and medium-voltage power lines which have not been primarily designed for this application results in uncontrolled radiated emission. Secondly, power transmission and distribution networks, especially transmission lines, are vulnerable to transient electromagnetic radiation emitted from external sources. Indirect lightning strikes are considered one of the important sources of such energy that can induce over-voltages in overhead lines and underground cables. Simulation of lightning-induced over-voltages and electromagnetic emissions from power lines carrying broadband data share a common theoretical background. They both require accurate and efficient models for the propagation of electromagnetic fields in lossy media. The proposed research aims at developing various techniques and high-frequency models for simulating electromagnetic emission and susceptibility problems experienced in power-system transmission-line networks. Modeling the frequency dependence of the transmission-line parameters, the inclusion of ground loss within the models, and integrated macro-models for accurate and efficient calculation of lightning-induced electromagnetic fields are the distinguishing features that make the problem difficult but are necessary because of their significant impact on the accuracy of the simulation results and the efficiency of the developed techniques.