Loading...
Please wait, while we are loading the content...
Similar Documents
8. Conclusions and Future Work 8.1 Conclusions
| Content Provider | Semantic Scholar |
|---|---|
| Abstract | This work has comprehensively addressed the issues of parallel three-phase PWM converters. The major accomplishments and some conclusions are summarized below. • This work has developed a novel modeling approach for parallel three-phase converters. Instead of modeling the parallel converters as a whole, a generic functional switching unit is identified and averaged. The unit for the current-bidirectional converters is called a phase leg. The unit for the current-unidirectional converters is called a rail-arm. Functionally, the phase leg and rail arm are the most basic components in their converters. Based on the phase-leg or rail-arm averaging, the developed three-phase converters' model is not only equivalent to the conventional three-phase converters' model that is based on phase-to-phase averaging, but it also preserves common-mode information, which is critical in the analysis of the parallel converters. • As part of the parallel models, a unique zero-sequence channel in both current-bidirectional and current-unidirectional converters has been explicitly shown. It is found that the zero-sequence current is governed by the difference of the common-mode voltages between the two converters. The common-mode voltage of one converter normally has no impact on the converter output except high-frequency common-mode noise, which is usually dealt with by filters. Because of the directly parallel operation, a zero-sequence current path is formed. As a result, the common-mode voltage has to be controlled so that the zero-sequence current can be minimized. • This work has proposed a novel zero-sequence current control concept that uses varying zero-vectors in the pulse-width modulation of the converters. The principle of the control idea is to reject the zero-sequence current within an individual converter. Therefore, the control can be designed independently from the other |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://theses.lib.vt.edu/theses/available/etd-11062000-08510043/unrestricted/Chapter8.pdf |
| Alternate Webpage(s) | http://scholar.lib.vt.edu/theses/available/etd-11062000-08510043/unrestricted/Chapter8.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
