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In this study, a multilevel five-leg single-phase ac–dc–ac converter and its generalisation are presented. The converter is suitable to be used as an uninterrupted power supply or a unified power quality conditioner without an isolation transformer. The operating principles, the pulse-width modulation strategy and the control system for the proposed converter are presented. The proposed single-phase...
A novel control strategy without phase-locked loop (PLL) for the three-phase AC/DC converter is proposed in this study. There is no need to detect the phase angle of the grid and the defect of inaccurate phase-locking can be remedied. The frequency of the grid can be detected by a frequency tracking method. A linear changed angle from −π to π with the detected grid frequency is generated by the DSP...
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