Circulating Current Suppression of Parallel Photovoltaic Grid-Connected Converters

The photovoltaic (PV) grid-connected converter (GCC) is a critical interface between solar energy and the power grid. Improved efficiency is possible if several PV GCCs have a common array bus. However, the dc side shunt causes the circulation of a zero-sequence current, which will distort the GCC o...

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Bibliographic Details
Published in:IEEE transactions on circuits and systems. II, Express briefs Express briefs, 2018-09, Vol.65 (9), p.1214-1218
Main Authors: Zhang, Peng, Zhang, Guorong, Du, Haibo
Format: Article
Language:English
Subjects:
Converters
Current control
Damping
Energy conversion efficiency
filter
finite-time controller
Parallel
Passive filters
Photovoltaic cells
Photovoltaic systems
Power efficiency
Power harmonic filters
PV GCC
Semiconductor devices
Solar cells
Solar energy
Transfer functions
Zero sequence current
zero-sequence circulating current
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Summary:The photovoltaic (PV) grid-connected converter (GCC) is a critical interface between solar energy and the power grid. Improved efficiency is possible if several PV GCCs have a common array bus. However, the dc side shunt causes the circulation of a zero-sequence current, which will distort the GCC or even damage semiconductor devices. The zero-sequence current includes high- and low-frequency components. A novel passive filter is proposed to increase the order of the zero-sequence circulating current transfer function to reduce the high-frequency component without increasing the cost. Furthermore, an advanced finite-time controller is introduced to mitigate the low-frequency component with fast regulation performance and strong disturbance rejection. The test results for two 10-kW GCCs are presented to confirm the performance of the method.
ISSN:1549-7747
1558-3791
DOI:10.1109/TCSII.2017.2789215