Abstract
This paper proposes a novel three-phase inverter based on buck converter and an efficient control method for the operation. The inverter circuit is comprised of moderate numbers of elements in terms of reducing design density and cost and improving operation capabilities. Unlike the similar studies in the literature, an efficient inverter control method that is feedforward supported closed-loop control is applied to the inverter to augment the response performance of the inverter output on different operation conditions. The inverter topology has a modular structure for each output phase that provides independent control of output voltage and frequency. Thus, the inverter can provide close to sine wave output voltage to supply balanced or unbalanced wye-connected three-phase loads or independent single-phase loads. Both simulation and experimental test studies are done for the proposed inverter. The inverter is designed for 1.5 kW, 0–100 Vp and 0–50 Hz operating rates. The test results prove both the theoretical and real-time accuracy of the proposed inverter for producing close to sine wave output voltages with less than 5% total harmonic distortion (THD) values on different working points.
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