Abstract
In order to identify the best control algorithm, studies were made based on the effect of modulation control algorithms on the energy characteristics of a two-level autonomous inverter of a frequency converter. The research was carried out using mathematical and simulation methods. The equations of mathematical description were formulated taking into account a number of generally accepted assumptions. An equivalent circuit of a two-level autonomous inverter, comparisons of the algorithms of pulse-width modulation with carrier signals of various shapes and frequencies were made. Three different forms of the carrier signal were used: triangular, sawtooth with a trailing edge and sawtooth with a leading edge. The studies were performed at frequencies of 3000, 6000 and 9000 Hz. The conclusions were made about the identity of the spectral composition of the leading and trailing edges of the sawtooth signal, it was also noted that with the triangular waveform the part of the harmonics present in the sawtooth form is removed, that is, the triangular shape provides the best result of the operation of the autonomous inverter. Also, when the frequency of the carrier signal was increased, it was noted that the pulse packets appeared on different harmonic numbers, shifted, and the magnitude and distortion coefficient decreased, that is, the best indicators were obtained at the maximum frequency under study. When examining the voltage at the output of the chokes at a different frequency of the carrier signal, it was noted that at a higher value the pulsation frequencies of the output voltage decrease. Chokes do not eliminate harmonics but only reduce their amplitude. On the basis on the obtained results, it is concluded that the algorithm with a triangular carrier signal and maximum frequency provides the best harmonic composition of the output voltage of the frequency converter.
Keywords
Electric drive, frequency converter, autonomous inverter, pulse width modulation.
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