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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Moia, J. Perin, A.J. Heldwein, M.L. |
| Copyright Year | 2012 |
| Description | Author affiliation: Federal University of Santa Catarina - UFSC, Electrical Engineering Department / Power Electronics Institute - INEP, PO box: 5119 - 88040-970 - Floriano´polis, SC, Brazil (Moia, J.; Perin, A.J.; Heldwein, M.L.) |
| Abstract | This work is part of a research effort to evaluate and develop power converter systems that are to be used in future bipolar dc active distribution networks. A characteristic of such networks is that the power levels across each of the dc-buses can be highly unbalanced at steady-state. Therefore, the front-end bidirectional rectifier system is required to provide well regulated, balanced and low ripple dc voltages to the bipolar dc bus. A straightforward modulation technique is introduced here for three-level/-phase bidirectional PWM rectifiers. The method is based in the analysis of three-level converters in the αβ0 stationary reference frame, where the ac currents and duty-cycle α and β components are used to compute the required 0-axis duty-cycle that guarantees that the dc-link center point low frequency current components are nullified. The technique is implemented in a carrier-based PWM modulation scheme. Implementation in a digital processor is used in a three-level bidirectional converter lab prototype. The prototype is tested to present experimental results of the proposed technique. The main consequences of the proposed technique are that both bipolar dc bus voltages present negligible voltage ripple even under highly unbalanced bus power levels and variable ac-side power factor, which is appropriate to interface a dc bipolar distribution network to an ac system with controlable reactive power injection. An important secondary effect is that the rms current value is greatly reduced in the converter dc bus capacitor. |
| Starting Page | 740 |
| Ending Page | 747 |
| File Size | 4564137 |
| Page Count | 8 |
| File Format | |
| ISBN | 9781457712159 |
| e-ISBN | 9781457712166 |
| e-ISBN | 9781457712142 |
| DOI | 10.1109/APEC.2012.6165902 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2012-02-05 |
| Publisher Place | USA |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Switching frequency Pulse width modulation Voltage control Simulation Switches Reactive power stationary frame analysis three-level converter neutral point current dc-link voltage ripple |
| Content Type | Text |
| Resource Type | Article |
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