| Summary: | 碩士 === 國立勤益技術學院 === 資訊與電能科技研究所 === 93 === The purpose of this thesis is to develop a soft-switching mode rectifier (SSMR)having high power quality. The developed SSMR can be employed as a DC power supply providing well-regulated DC source, or as an adjustable-voltage source to charge the battery. In the meantime, the researches are also made on multi-module parallel operation and the construction of three-phase SSMRs using the developed single-phase SSMR. First, a single-phase SSMR with unity power factor will be designed and implemented.
The circuit operations and derivation of governing quations of the proposed SSMR in various mode will be described in detail. And the quantitative design procedure of the proposed SSMR circuit components will be presented. As to the design of controllers, the SSMR dynamic model is derived first and hence the current controller is designed. On the other hand, the parameters of the voltage controller are systematically and quantitatively obtained according to the converter dynamic model derived at a nominal case by veraging method for two-time-scale(AM-TTS) and averaged power method under the given control specifications.Based on the proposed single-phase SSMR, the studies on parallel operation control of multi-module single-phase SSMRs are carried out for increasing the system capacity and reliability. With proper robust controller design, good current sharing control under good output voltage regulation performance is obtained.
Finally, three-phase SSMRs formed by the connection of single-phase SSMR modules are proposed. When one single-phase module in the ∆-connected three-phase SSMR fails, it is changed to V -connection with fault detection scheme, and continue to perform the three-phase rectification. Rather good power quality can still be obtained at the price of a reduction of the system capacity. For the ∆-connected three-phase SSMRs, the connection, system capacity and the generation of current command for each single-phase SSMR is described in detail. Some simulated and measured results have been provided to verify the effectiveness of the designed controllers.
|
|---|
