Abstract
The purpose of this thesis is to develop the three-phase boost-type soft-switching mode rectifiers (SSMRs), which are formed via various kinds of connections by single-phase SSMR modules. The developed SSMRs possess good power quality in line drawn current under the well-regulated DC output voltage.For the convenience of performing the power quality evaluation, some commonly used standards for handling the power quality issues are first investigated. Then, a single-phase boost-type SSMR is designed and implemented. The state-space averaging method is employ to derive the small signal model of the SSMR in current control loop. And it is used to perform the current controller design. The circuit operations and the derivations of governing equations of the proposed SSMR in various modes are described in detail. And accordingly the circuit design of the SSMR is made. The simulation and measured results show that the operating performances of the designed SSMR are very close to the expected ones and the input current is regulated to be sinusoidal and kept almost in phase with the input voltage in all operating conditions.In the development of the three-phase switching mode rectifier, the existing three-phase SMRs, the three-phase SMRs formed by the connection of single-phase SMR modules are first surveyed. Then, the proposed three-phase SSMRs are presented. When one single-phase module in the - or -connected three-phase SSMR is broken-down, it can be changed to - or -connection, and continue to perform the three-phase rectification. Rather good power quality can still be obtained subject to the reduction of system capacity. For the various connected three-phase SSMRs, the connection, the system capacity and the generation of current command for each single-phase SSMR are described in detail. As to the voltage controller design, its dynamic model is first estimated from measurements. And then, a quantitative design procedure is developed to find the parameters of the voltage controller according to the estimated model and the prescribed control specifications. Some simulated and measured results are provided to verify the effectiveness of the designed controllers. In addition, the comparisons of efficiency, power factor and current total harmonic distortion of the developed various types of three-phase SSMRs are made.