A Grid-Connected PV System Based on Quasi-Z-source Inverter with Maximum Power Extraction

This paper proposes an approach to link photovoltaic arrays with the AC grid using Z-source inverter (ZSI) and quasi-Z-source inverter (QZSI) topologies. These topologies boost the DC-link voltage and invert it to AC voltage in one stage, resulting in a reduction in the overall system size and cost....

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Bibliographic Details
Published in:IEEE transactions on industry applications 2023-09, Vol.59 (5), p.1-11
Main Authors: Elmorshedy, Mahmoud F., Essawy, Ihab Jamal Al, Rashad, Essam M., Islam, Md Rabiul, Dabour, Sherif M.
Format: Article
Language:English
Subjects:
Algorithms
Arrays
Capacitors
Control algorithms
Control systems
Control theory
decoupling control
Electric potential
Equivalent circuits
grid connected
Independent variables
Inductors
Inverters
Maximum power
maximum power point tracking
Photovoltaic
Photovoltaic cells
Power factor
standalone
Topology
Unity
unity power factor
Voltage
Voltage control
Z-source inverter
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Summary:This paper proposes an approach to link photovoltaic arrays with the AC grid using Z-source inverter (ZSI) and quasi-Z-source inverter (QZSI) topologies. These topologies boost the DC-link voltage and invert it to AC voltage in one stage, resulting in a reduction in the overall system size and cost. The paper presents a control technique that fixes the DC-link voltage on the inverter bridge terminals, tracks the maximum power point (MPPT), and controls the amount and quality of power injected into the grid using unity power factor. The proposed control algorithm utilizes two independent control variables, shoot-through duty cycle (ST) and modulation index, to decouple the control of the DC and AC sides. The effectiveness of the proposed control technique is verified through simulations of a grid-connected PV system. The results demonstrate that the proposed system can efficiently extract maximum power from PV arrays while regulating the DC-link voltage and ensuring unity power factor operation. Additionally, experimental testing of ZSI/QZSI further confirms the results of analysis and simulation.
ISSN:0093-9994
1939-9367
DOI:10.1109/TIA.2023.3275557