A grid-connected single-phase photovoltaic micro inverter

In this paper, the topology of a single-phase grid-connected photovoltaic (PV) micro-inverter is proposed. The PV micro-inverter consists of DC-DC stage with high voltage gain boost and DC-AC conversion stage. In the first stage, we apply the active clamp circuit and two voltage multipliers to achie...

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Bibliographic Details
Published in:IOP conference series. Earth and environmental science 2017-11, Vol.93 (1), p.12079
Main Authors: Wen, X Y, Lin, P J, Chen, Z C, Wu, L J, Cheng, S Y
Format: Article
Language:English
Subjects:
Algorithms
Circuits
Control methods
Electric converters
High voltage
High voltages
Inverters
Maximum power tracking
Modules
Photovoltaic cells
Photovoltaics
Pollination
Topology
Voltage
Voltage gain
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Summary:In this paper, the topology of a single-phase grid-connected photovoltaic (PV) micro-inverter is proposed. The PV micro-inverter consists of DC-DC stage with high voltage gain boost and DC-AC conversion stage. In the first stage, we apply the active clamp circuit and two voltage multipliers to achieve soft switching technology and high voltage gain. In addition, the flower pollination algorithm (FPA) is employed for the maximum power point tracking (MPPT) in the PV module in this stage. The second stage cascades a H-bridge inverter and LCL filter. To feed high quality sinusoidal power into the grid, the software phase lock, outer voltage loop and inner current loop control method are adopted as the control strategy. The performance of the proposed topology is tested by Matlab/Simulink. A PV module with maximum power 300W and maximum power point voltage 40V is applied as the input source. The simulation results indicate that the proposed topology and the control strategy are feasible.
ISSN:1755-1307
1755-1315
DOI:10.1088/1755-1315/93/1/012079