Novel Three-Level Converter forPower-Factor-Correction and Connected To DC Drive

Abstract: Harmonic pollution and low power factor in power systems caused by power converters have been of great concern. To overcome these problems several converter topologies using advanced semiconductor devices and control schemes have been proposed. In this paper a new three-level ac–dc single-stage converter that can operate with standard phase-shift pulse width modulation is proposed.The ac–dc power supplies with transformer isolation are typically implemented with some sort of input power factor correction (PFC) to comply with harmonic standards such as IEC 1000-3-2. There are three techniques to satisfy these standards. One of them is adding passive filter elements to the traditional passive diode rectifier/LC filter input combination; the resulting converter is very bulky and heavy due to the size of the low-frequency inductors and capacitors. In this paper, the operation of the converter is explained, and its feasibility is confirmed with experimental results obtained from a prototype converter. Finally, the efficiency of the new converter is compared with that of the converter shown. In extension we connect a DC motor as a load to the proposed converter and observe the performance. The advantage of the proposed converter is resulting an output of 3 level which reduces stress of voltage. The proposed system is a single stage conversion where DC-DC conversion is not needed.