Advanced Nonlinear Control of A Grid-Connected Photovoltaic Power System Using N-Cascaded H-Bridge Multilevel Inverters

The present paper discusses the modelling and the nonlinear control of a DC/AC conversion system composed of photovoltaic arrays, boost converters, DC bus capacitors, N-cascaded H-bridge multilevel inverters (CHBMI) and an L-filter linked to a single-phase grid. This work aims at achieving threefold...

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Bibliographic Details
Published in:IFAC-PapersOnLine 2020, Vol.53 (2), p.12859-12864
Main Authors: Katir, H., Abouloifa, A., Lachkar, I., Noussi, K., Giri, F., Guerrero, J.M.
Format: Article
Language:English
Subjects:
Backstepping approach
Cascaded H-bridge multilevel inverter
Grid
Lyapunov
Nonlinear control
PFC
PV system
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Summary:The present paper discusses the modelling and the nonlinear control of a DC/AC conversion system composed of photovoltaic arrays, boost converters, DC bus capacitors, N-cascaded H-bridge multilevel inverters (CHBMI) and an L-filter linked to a single-phase grid. This work aims at achieving threefold control objectives: i) regulating the voltages across the PV panels in order to extract the available maximum power, ii) guaranteeing a unitary power factor (UPF) by forcing the grid current to be sinusoidal and in phase with the electric network voltage, iii) controlling the DC-link voltages to track their given references. The achievement of these objectives is done thanks to a regulator based on a multi-loop structure. Indeed, on one hand, each panel is individually controlled to track the maximum power point; on the other hand, two cascaded loops aim at ensuring a satisfactory power factor correction and DC-link voltages regulation. The proposed regulator is developed using the nonlinear backstepping approach and some tools from Lyapunov stability. The simulation results, obtained using MATLAB/SIMULINK/ SimPower Systems environment, prove that the synthesized regulator meets its objectives and presents interesting performance in terms of tracking and regulation.
ISSN:2405-8963
2405-8963
DOI:10.1016/j.ifacol.2020.12.2095