Rezumat
CZU 621.314.572
DOI https://doi.org/10.52577/eom.2026.62.3.58
This article provides a brief overview of the development and dissemination of a method of a synchronous space-vector pulse-width modulation (PWM) of signals of inverter units of power conversion systems based on two and three voltage source inverters with a smooth regulation of the switching frequency of the inverter electronic switches (power transistors and thyristors) during control. An analysis of modulation processes in the grid-connected transformer-type power conversion systems with a constant output frequency based on dual and triple voltage source inverters with a synchronous PWM was performed. Smooth adjustment of the inverters switching frequency as a function of the inverter supply voltage amplitude and the inverter modulation factor is based on the condition of stabilizing the voltage on inverter-side windings of power transformer during control of systems. Modulation processes in transformer-based power conversion systems were simulated. It was shown that, in a number of control modes, modified schemes and algorithms of a synchronous PWM of inverters with adjustable switching frequency of power switches improve the spectral composition of the inverter units' output voltage, thereby reducing losses in the power transformer and increasing the efficiency of the corresponding converter systems.
Keywords: voltage source inverter, control and modulation algorithms, photovoltaic system, multi-winding power transformer, harmonic composition of the output voltage of inverter units.