A grid-connected single-phase photovoltaic micro inverter

2017 International Conference on New Energy and Future Energy System

Wen, X.Y.^1 ; Lin, P.J.^1,2 ; Chen, Z.C.^1,2 ; Wu, L.J.^1,2 ; Cheng, S.Y.^1,2

Institute of Micro/Nano Devices and Solar Cells, College of Physics and Information Engineering, Fuzhou University, Fuzhou

350116, China^1

Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering, Changzhou

213164, China^2

关键词: Active clamp circuits;    Flower pollination algorithms;    Grid-connected photovoltaic;    Grid-connected single-phase photovoltaic;    H-bridge inverters;    Maximum power point;    Maximum Power Point Tracking;    Voltage multipliers;   

Others  :  https://iopscience.iop.org/article/10.1088/1755-1315/93/1/012079/pdf
DOI  :  10.1088/1755-1315/93/1/012079

来源: IOP

【 摘 要 】

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.