Lectrical loads by nonlinear current-voltage qualities, approximated by various functions, are widespread, for instance, switching functions [16] or differential equations [17,18]. Even so, more sophisticated approaches based on semiconductor converter models have also been extensively employed [19]. The complexity of mathematical models leads to the limited use of analytical methods [20,21] and much more extended use of simulation modeling, which makes it doable to get numerical solutions for the tasks [22,23]. In addition, it really is frequently necessary to carry out rough estimates of network operation modes with nonlinear loads although preserving sufficient accuracy for engineering practice. In this case, the calculations is usually pretty approximate, and don’t demand the application of complicated mathematical models. Standard modelling of nonlinear load appears to be appropriate in this case [24,25]. In [24,26,27], diode six-pulse rectifier modelling is deemed. Such a model, represented by current sources with magnitude Ih , might be calculated by the Equation: Ih = I1 h (1)where h may be the harmonic order and I1 may be the magnitude with the very first harmonic existing consumed by the rectifier. The benefit of this model could be the simplicity of its application; having said that, such a model is inaccurate [28], and also the legitimacy of its use has, in numerous circumstances, been questioned. In line with [29,30], it is actually also frequent to represent the diode six-pulse rectifier as a source of present harmonics, as determined by the existing spectrum. Furthermore, the model of diode six-pulse rectifier might be presented by means of a table based harmonic model [24,31]. The table is made primarily based on experimental measurements in the rectifier currents when external circumstances are changing (e.g., line impedance, further ac-reactance, dc-link inductance and load parameters). A wide range of reference information increases the accuracy from the calculations, but this strategy is extremely time consuming when measuring large amounts of data. Several articles [32,33] have proposed representing nonlinear loads around the basis of time-domain [34,35], harmonic domain [36] or frequency domain models [37]. Based on the frequency-domain model strategy, a power converter may very well be analyzed by observing the converter passing by means of a sequence of states describing its conduction pattern. In each and every state, the converter could be represented by a passive linear circuit and analyzed together with the support of complex harmonic phasors [38,39]. As for the time domain model, the converter is represented by a program of differential equations or operating state equations [402]. Just after Caroverine medchemexpress solving these equations, the spectrum on the converter harmonic currents in the AC side is determined utilizing the fast Fourier transform. One of several most widespread approached in harmonic energy flow will be the hybrid timefrequency domain approach. It tries to exploit the advantages in the time and frequency domain approaches, i.e., linear components are modeled in the frequency-domain, when nonlinear elements are represented within the time-domain [17,26,27,43]. Based on [25], for thyristor energy regulators, the 2nd, 3rd, 4th, 5th, 7th, 11th, 13th harmonic currents will be the most typical (L-Palmitoylcarnitine supplier greater than 0.5). In the case of an individual consumer, the magnitudes of 5th, 7th, 11th, 13th harmonics are determined by the following equation: 0.7Snom Ih = 3Unom h although the magnitudes on the 2nd, 3rd and 4th harmonics may be determined by: 0.1Snom Ih = , 3Unom h (3) (.