An Improvement of Predictive Control for Single Phase Voltage Fed Power Factor Correction Converters

Harmonic contamination and low power factor in power systems caused by power converters have been a great concern. The effect of harmonics in current due to lagging power factor are the increase in current flow in the capacitors which results in additional heating of the capacitors and reduce its life, increased magnitudes of neutral currents in three phase systems, over-heating in transformers and induction motors. To overcome these problems several converter topologies and control schemes have been proposed in recent years. This work is proposed to identify the power converters with low cost/small size/high efficiency for single phase systems and also to study the control techniques for such converters to improve the Power Factor (PF) and reduce total harmonic distortion (THD) in the input current with output voltage regulation. This work has very high potential for UPS, motor drives and other industrial applications. A predictive control strategy for power factor correction of AC DC converter is to maintain the unity power factor. Its basic idea is that all of the duty cycles required to achieve unity power factor in a half line period are generated in advance by using a predictive control topologies. It can be based on the average output voltage in the previous half line period, the duty cycles in the current half line period can be calculated by the predictive control topologies. The operation, analysis and design of control technique for high performance rectifier are investigated and verified through simulation.