Title: Multi-input multi-output sliding-mode control of LCL-based grid-connected modified Y-source inverter for power conditioning of photovoltaic generation

Authors: Seyede Tahere Hashemi; Mehdi Siahi; Majid Hosseinpour; Javad Olamaei

Addresses: Department of Electrical Engineering, Islamic Azad University, Kish International Branch, Kish Island, Iran ' Department of Electrical Engineering, Islamic Azad University, Kish International Branch, Kish Island, Iran; Faculty of Mechanics, Electrical Power and Computer, Islamic Azad University, Science and Research Branch, Tehran, Iran ' Department of Electrical Engineering, Islamic Azad University, Kish International Branch, Kish Island, Iran; Department of Electrical and Computer Engineering, University of Mohaghegh Ardabili, Ardabil, Iran ' Department of Electrical Engineering, Islamic Azad University, Kish International Branch, Kish Island, Iran; Department of Electrical Engineering, Islamic Azad University, South Tehran Branch, Tehran, Iran

Abstract: A multi-input-multi-output (MIMO) sliding mode controller has been proposed in this paper in order to control a grid-connected photovoltaic (PV) power conditioning system with an LCL filter. In the proposed control approach, nonlinear-control method is used and simultaneous control of both the AC and DC inverter sides is done. Therefore, all the state variables are controlled simultaneously. The proposed sliding mode control (SMC) method provides several advantages, including zero grid current error, easy implementation, and robustness against parameter uncertainties of the investigated system. Hence, the resonance in the inverter output resulting from the LCL filter can be eliminated using SMC with no need for active damping techniques. Applying this approach can bring about maximum power point tracking (MPPT), control of the DC side, and injection of high-quality current into the grid at the AC side of the inverter. Various simulations have been conducted in MATLAB/Simulink for the proposed system.

Keywords: AC side control; DC side control; multi-input-multi-output; MIMO-SMC; modified Y-source; PV; single-phase; sliding mode control; SMC; maximum power point tracking; MPPT.

DOI: 10.1504/IJAAC.2023.130570

International Journal of Automation and Control, 2023 Vol.17 No.3, pp.328 - 350

Received: 28 Oct 2021
Accepted: 21 May 2022
Published online: 28 Apr 2023 *

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