EFFICIENT METHOD OF HARMONIC ANALYSIS OF THREE-PHASE CIRCUITS WITH NONLINEAR CONTROLLED SWITCHING ELEMENTS
Keywords:
Harmonic analysis, Hănțilă method, Nonlinear three-phase circuits, Nonlinear controlled switching elements, ThyristorAbstract
We devote our present study to the use of the Hănțilă method for solving three-phase circuits comprising nonlinear controlled switching elements (for example: thyristors). The method consists in replacing nonlinear circuit elements with controlled generators, comprising dependent sources and internal resistances. The value of these sources is determined using an algorithm with assured convergence, based on the construction of a Picard-Banach sequence, featuring successive passages between frequency domain and time domain, and vice-versa. The internal resistance value is chosen such that the algorithm convergence is ensured. The obtained results are compared for validation with those obtained by solving the circuit in time domain utilizing the LTspice software. Being a frequency analysis, it also considers the occurrence of the Gibbs phenomenon.
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