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HarmZs - Electrical Network Harmonic Studies and Modal Analysis


The HarmZs software is designed to perform harmonic studies in large-scaled power systems. This program carries out two kinds of analyses: conventional and modal. The modal analysis is able to acquire structural system information, such as natural oscillation modes (system resonances) as well as the equipment that is chiefly responsible for these modes, which is difficult to be obtained by conventional methods such as time simulation or frequency response. This information can be efficiently used to improve the harmonic system performance. The conventional analysis computes harmonic voltage distortion, harmonic currents flowing through the system components, frequency responses of different types of transfer functions (impedances, admittances and gains) and envelope diagrams of impedance and admittance.


The HarmZs can read input data files from the programs ANAREDE (Power Flow Network Analysis) and ANATEM (Analysis of Electromechanical Transients) in order to extracts network component data concerning shunt elements, transmission lines, transformers, loads and generators (armature resistance and sub-transient reactance).


Nowadays HarmZs is widely used to evaluate the harmonic impact of new nonlinear load connections to the National Grid of the Brazilian Interconnected Power System (BIPS), involving several network topologies, load levels, load models and contingencies. Such studies can be speeded up and made automatic using the “batch” tool and the friendly graphical interfaces available within the HarmZs software.


In this batch tool, the high-performance computational method (TURBO method) is used, which allows the calculation of all self-impedances of the BIPS under contingency as a function of the self-impedance of the normal operating BIPS. This avoids the reassembly and LU refactoring of the nodal admittance matrix Y for each BIPS contingency, making this method dozens of times computationally faster than the traditional method, also implemented in the HarmZs program.










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