Decoupling control for transformerless grid-connected inverters in parallel operation
The modular non-isolated inverter structure enhances the efficiency and redundancy of the PV generation system. Current coupling between the transformerless grid-connected inverter modules for PV power system is researched. The operation modes of the non-isolated inverters with different topologies...
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Published in | 2011 Twenty-Sixth Annual IEEE Applied Power Electronics Conference and Exposition (APEC) pp. 1552 - 1556 |
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Main Authors | , , , , |
Format | Conference Proceeding |
Language | English |
Published |
IEEE
01.03.2011
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Subjects | |
Online Access | Get full text |
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Summary: | The modular non-isolated inverter structure enhances the efficiency and redundancy of the PV generation system. Current coupling between the transformerless grid-connected inverter modules for PV power system is researched. The operation modes of the non-isolated inverters with different topologies and modulations are analyzed and the current decoupling conditions are obtained. Inverters which are capable of eliminating the common-mode current, such as H5 topology, can be operated in parallel with no extra control. And a current decoupling control for the unipolar double frequency PWM full-bridge inverters in parallel operation is proposed with regulating the currents of two split filter inductors respectively. Prototype systems are built and experimental results verify the validity of the proposed theory and control strategy. |
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ISBN: | 9781424480845 1424480841 |
ISSN: | 1048-2334 2470-6647 |
DOI: | 10.1109/APEC.2011.5744800 |