Machinery & Energetics

The spread of modern computer-integrated technologies leads to an increase in the proportion of consumers with nonlinear loads that cause distortion of the sinusoidal voltage by higher harmonics, which adversely affects other equipment, causing it to overheat and damage, disturbing device synchronization and interruptions in data networks and other negative consequences. These factors necessitate the development of new methods for research, analysis and minimization of nonlinear voltage distortions the purpose of the work the study of the distortion of dymanics of the form of sinusoidal voltage by higher harmonics, the definition of numerical characteristics of distortions and the possibilities for their minimization. The study of the distortion dynamics of the shape of the sinusoidal voltage curve by higher harmonics was carried out by numerical simulation of the instantaneous voltage value using an automated system. The estimation of distortions of the form of voltage was carried out on the deviation from the sinusoid of the "reference" points - the amplitude value of the voltage U, and the phase of the amplitude value of the voltage φ. The simulation and analysis of distortions of the sinusoidal voltage form with the second and third highest harmonics was carried out. Dependences of the bending voltage U on the phase φ and the phase φ of the envelope of the second phase and the third harmonic of the φn phase have been obtained and the estimates of the distortions caused by these harmonics have been carried out. The formulas for estimating boundary variations of the amplitude are given: Umax = 1 + Kn; phases: jm = arsos (nKn); the calculation of the initial phase of the harmonic jn, in which the phase deviation φ is equal to zero: j2 = ± p / 2 and j3 = 0, j3 = ± p, and the equation for jn and φ, at which deviations U are zero. The obtained harmonics in the simulation of distortion of sinusoidal voltage can be used to determine the permissible levels of nonlinear distortions, to calculate the errors of measurements of amplitude, frequency and phase difference from higher harmonics, to develop methods for minimizing distortions, etc.

electric power, quality, harmonics, voltage distortion, modeling