Abstract
The grid-voltage unbalance can result in a double-frequency component in the output power of a three-phase grid-connected converter, which significantly degrades the system performance. To address this issue, the power decoupling concept, which was previously developed for the single-phase system to handle the double-frequency power oscillation, is applied to the three-phase system in this paper. To begin with, three topologies are proposed to implement the power decoupling function in the three-phase converter system, which can maintain dc-link voltage constant while ac grid current balanced under unbalanced grid voltage through absorbing the double-frequency power component. Then, the control system realization of each power decoupling topology is presented and their working principles are described in detail. Furthermore, three prototypes are developed under different types of unbalanced grid voltage condition to evaluate the performance of the proposed methods. Experimental results are eventually provided to validate the effectiveness of the three proposed schemes.
Original language | English |
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Title of host publication | 2017 IEEE 18th Workshop on Control and Modeling for Power Electronics, COMPEL 2017 |
Publisher | IEEE |
Publication date | 18 Aug 2017 |
Article number | 8013303 |
ISBN (Electronic) | 978-1-5090-5326-1 |
DOIs | |
Publication status | Published - 18 Aug 2017 |
Event | 18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 - Stanford, United States Duration: 9 Jul 2017 → 12 Jul 2017 |
Conference
Conference | 18th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2017 |
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Country/Territory | United States |
City | Stanford |
Period | 09/07/2017 → 12/07/2017 |
Keywords
- active power decoupling
- grid voltage unbalance
- power oscillation
- three-phase grid-connected converter