Passivity-Based Control of Single-Phase Cascaded H-Bridge Grid-Connected Photovoltaic Inverter

This article presents a nonlinear passivity-based control for a grid-connected cascaded H-bridge (CHB) photovoltaic (PV) system. The proposed control system is based on a port-controlled Hamiltonian model extracted from the synchronous reference frame system. Grid current dynamics is included in thi...

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Bibliographic Details
Published in:IEEE transactions on industrial electronics (1982) 2023-02, Vol.70 (2), p.1512-1520
Main Authors: Moeini, Narges, Bahrami-Fard, Milad, Shahabadini, Masoud, Azimi, Seyed Mohammad, Iman-Eini, Hossein
Format: Article
Language:English
Subjects:
Algorithms
Arrays
Cascaded H-bridge (CHB) converter
Closed loop systems
Control methods
Control systems
Damping
Electric potential
grid-connected photovoltaic (PV) systems
Inverters
Irradiance
Mathematical models
Maximum power tracking
Nonlinear control
passivity-based control
Photovoltaic cells
Photovoltaic systems
port-controlled Hamiltonian (PCH) model
Robust control
Voltage
Voltage control
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Summary:This article presents a nonlinear passivity-based control for a grid-connected cascaded H-bridge (CHB) photovoltaic (PV) system. The proposed control system is based on a port-controlled Hamiltonian model extracted from the synchronous reference frame system. Grid current dynamics is included in this model. Compared to existing solutions, the proposed control method has a robust performance and enhances the stability of the CHB-based PV system in the case of disturbances such as unequal irradiance over distinct PV arrays or a sudden sag or swell in the grid voltage. This controller also provides the independent control of each dc-link voltage. Therefore, the individual maximum power point tracking algorithms can be realized in each PV array, and the harvested energy can be maximized. Finally, simulation results and experimental investigations are conducted to verify the effectiveness of the proposed strategy.
ISSN:0278-0046
1557-9948
DOI:10.1109/TIE.2022.3165266