Rezumat
CZU 621.314.572
DOI https://doi.org/10.52577/eom.2024.60.4.67
The modified method of the synchronous pulse-width regulation of inverters of variable-voltage variable-frequency electric drives makes it possible to provide control modes with the required nonlinear relationships between the magnitude of the output voltage of the inverter unit and the operating frequency of an ac drive. Thus modernized techniques and algorithms for the synchronous pulse-width regulation of inverter units of three-phase and six-phase variable-frequency electric drives ensure continuous synchronization and symmetry of the phase and line voltages in systems over the entire control range. In the spectra of the base voltages of the systems, there were no even harmonics and subharmonics (of operating frequency of drives), thereby helping to reduce losses in those installations and increase the efficiency of their operation.
Keywords: converters of parameters of electrical energy based on voltage source inverters, algorithms of pulse-width regulation, variable-frequency electric drives with specialized loads, harmonic composition of the output voltage of inverter blocks.