New Methods in PWM Converters and Invertors

摘要

This report briefly discusses the work carried out during the author's postdoctoral research. This work relates to the analysis control and design of power electronics system.As far analysis, notion of frequency response of time-lifted system has been extended to study dc/dc converter system. In this regard, new approach to converter molding and frequency response evaluation has been studied. Second part of the research deals with the practical design of power factor correction rectifier system (PFC). After a detailed study, a new ZVS/ZCS boost PFC has been proposed, which utilize the commutation energy to improve the crossover distortion. Third part of research deals with design high voltage boost converters. High voltage operation of ZVS boost converter requires a snubber with lesser ringing and smaller commutation currents. A single switch auxiliary network has been proposed and verified experimentally in this regard. In fourth part the research a new reduced output voltage boost PFC has been proposed and experimentally verified. The final part of the research deals with the design and fabrication of an on going project of three-phase active power filter (APF). Following are the new innovation in this part of research work; (1) design of new ZVS/ZCS topology for the APF (2)design new way for voltage control loop (3) A new way for current control loop. These new techniques have also been verified experimentally.

目录

英文文摘

Introduction

Frequency Responses of DC/DC Converter System

Frequency Response Power Function

Computation of Frequency Response Power Function

Estimation through Experiment/Nonlinear Simulation

Conclusion

References

Influence of ZVS Snubber Near Zero Crossing

Introduction

Sources of crossover distortion

Modes of ZVS PFC

Performance Comparison

Conclusion

References

A ZVS/ZCS Solution to Distortion Minimization in PFCs

Introduction

An Extended Boost Topology

Experimental Results

Conclusion

References

A Voltage Divider Boost PFC

Introduction

Experimental Results

References

A ZVS/ZCS Boost Converter Topology for High Voltage Application

Introduction

Circuit Operation

Experimental Results

Conclusion

References

Active Power Filters

Introduction

Inverter Topology

Experimental Result

Voltage Control Loop

Current Control Loop

Experimental Results

References

Contribution of Present Research