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The problem studied in this paper and described in the literature is determining the fundamental frequency of a non-trivial signal in real-time. Using the gradient-descent algorithm, a new optimized method for fundamental frequency evaluation was proposed. The comparison between the two methods, classic and optimized, was carried out by utilizing a sine, square and amplitude modulated wave as input...
In this paper the expressions of symmetrical components of stator currents in the case of an unbalanced fault in an induction machine have been deduced. The analysis has been performed by using the symmetrical components method for the generalized load. It was considered the impedance changing across the stator terminals as the fault effect. Theoretical results have been compared to those obtained...
In this paper the symmetrical components of stator currents, if an unbalanced fault occurs in an induction machine have been analysed. A critical analysis of their expression, previously determined using the symmetrical components method, has been carried out. It was considered the impedance changing across the stator terminals as the fault effect. The analysis performed by simulation was based on...
In this paper, the transient current and flux expressions of an induction machine have been analyzed in the case of a three phase short circuit of the supply network. The starting point is the limitations of the simplified expressions, and the difference between the shape of the signals obtained via simulation and mathematical expressions. Mathematical expressions for currents and fluxes are derived,...
In this paper the transient electromagnetic torque expressions of an induction machine have been deduced and analyzed in the case of a three-phase short circuit of the supply network. Starting from the precise mathematical expressions for stator and rotor currents in the short circuit transient, the expressions of the electromagnetic torque have been established. Two damping components with the same...
In this paper, the expressions of transient currents and fluxes of an induction machine have been deduced in the case of a three phase short circuit of the supply network. Initial conditions assume that the machine is operating in no-load mode. In order to simplify the problem, the rotor speed is assumed to remain constantly at synchronous speed all over the time interval of interest. The analysis...
The paper shows how the Park Transformation can be used in the analysis of the asynchronous machine connected to a non-sinusoidal, unbalanced or asymmetrical three-phase voltage or current source. All the results are compared to those obtained by using the three-phase model for the induction machine. The numerical results have been achieved considering the two and three-phase model by SimPowerSystems...
The aim of this paper is to analyze the behavior of an asynchronous three-phase motor if the load torque was changed abruptly. Under the torque shock action a new balance condition is established which is reached as a result of a transient aperiodic or oscillator process. The paper presents the conditions in which the transfer corrected functions H3(s) or even H2(s) can be used so that the errors...
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