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Suppression of zero-crossing distortion for single-phase grid-connected photovoltaic inverters with unipolar
Bin Zeng1, Hong-bing Xu, Kai Chen
1School of Automation Engineering, University of Electronic Science and Technology of China, Chengdu, Sichuan 611731, China.
Abstract:
For single-phase grid-connected photovoltaic inverters, current-control with unipolar modulation can reduce the losses of power tubes and improve the efficiency compared with using the bipolar modulation. However, it suffers inherent zero-crossing distortion which is related to the grid current and voltage. In this paper, the reason for zero-crossing distortion is analyzed and simulated, also a novel current-control approach with commutating in advance is proposed to resolve this problem. This approach obtains a leading angle of the grid current by using the feedback of proportional-integral controller of the unipolar inverter, and then set the working mode of power tubes according to this angle through commutation.
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