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Harmonic and Short Circuit Analyses


The proper operation and service life of the several components that form an electric power system depend mainly on the quality of the electric power (voltages and currents with waveforms as close as possible to a perfect sinusoid). Due to the increase of non-linear loads, such as HVDC converters, static compensators, induction and electric arc furnaces, wind and solar farms that cause waveform distortion, analyzing the electric power system harmonic behavior becomes critical, mainly in the assessment of the impacts of new facilities connections to the National Grid of the Brazilian Interconnected Power System (BIPS). Therefore, one the objectives of this research line is to provide the HarmZs software for electric sector companies. HarmZs is a computer tool, capable of carrying out accurate and effective studies of harmonic behavior of electric power systems with state-of-the-art methods and techniques for harmonic calculation and filter design.


Currently, the HarmZs capability extent is pursued by developing a methodology for building electrical network dynamic equivalents for studies on electromagnetic transients. Once implemented, this facility will increase HarmZs software application spectrum making it also an important complementary tool in electromagnetic transient studies.


Other issues studied under this research line are related to the continuous expansion of the BIPS. This expansion results in increasing short-circuit current levels, which may exceed circuit breaker ratings. An important consequence of the occurrence of faults in electric power systems is voltage sags in buses close to the faulted bus. Those voltage sags can have important consequences on power quality required in various types of industrial processes, and may cause production losses or quality decrease in manufactured products.


Therefore, another objective of this research line is the continuous development of ANAFAS software, available to electric power utilities. ANAFAS is a computer tool capable of carrying out accurate and efficient short-circuit studies, considering several types of faults (including simultaneous ones). Results from these studies can be directly used to solve the aforementioned issues (indication of overrated circuit breakers and buses more likely to be affected by voltage sags) and also to rate new equipment regarding short-circuit current level requirements and to efficiently design and maintain protection systems in large electric power systems.



This line is related to “Steady State Analysis of Networks”, “Generation and Transmission Reliability” and “Transmission and Distribution Systems Expansion Planning”.


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