Multichannel Conversion of a DC Voltage into a Three-Phase Quasi Sinusoidal Voltage
In synthesizing a high-capacity three-phase voltage inverter (TVI) with multichannel conversion of power flow, it is proposed to use an energy-saving algorithm for control of its output voltage, which shapes the voltage waveform by means of pulse-amplitude modulation (PAM). Such TVI version is denoted as M-TVI with pulse-amplitude modulation. It is shown based on the comparative analysis results that in comparison with an М-TVI of the same class but with the conventional PWM-based algorithm for shaping the output voltage, the energy-saving control algorithm features lower values of power supply quantization levels and the minimal number of power switch switching operations. This also results in a lower level of generated interference, lower wear and longer service life of electrical machine winding insulation, smaller level of dynamic losses in the switches, and higher power source voltage utilization factor. The investigation was carried out with the use of Fourier series and computer simulation. The preferred application field of M-TVIs with PAM is using them for controlled AC motors of increased power capacity.