Control of Three-Phase Grid-Tied PV Inverters using Sliding Mode Technique

Articles in Press

Document Type : Original Article

Authors

Division of Energy, Materials and Energy Research Center.

10.22059/ses.2025.396999.1162

Abstract

Three-phase grid-tied inverters are the key technology for integrating renewable sources into the utility grid. They interact with the renewable source from one side and with the utility grid which is non-ideal in most cases from the other side. So, they must be equipped with a robust control system. In this paper, a sliding mode controller is proposed as a robust nonlinear control technique for three-phase grid-tied inverters. It is employed for the purpose of regulations of the three-phase injected currents to grid. The main purpose of the control system of a three-phase grid-tied PV inverter is, however, to achieve the maximum possible power from the PV and inject it to the utility grid. For this purpose, the control system is equipped with the maximum power point tracking algorithms for obtaining the voltage of the maximum power point at any weather conditions. The obtained voltage is employed as the reference value for the DC link voltage. We employ an appropriate maximum power point tracking algorithm in this paper. For the unity power factor at the point of common couplings, a variable power extracted from the PV results in accordingly varying the amplitudes of injected currents to grid. The proposed sliding mode controller makes the injection of maximum extractable power from the PV to the utility grid possible. The performance of the proposed approach is validated using a detailed switching model developed for the three-phase grid-tied PV inverter in Matlab/Simulink environment.

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Journal of sustainable Energy Systems

Articles in Press, Accepted Manuscript
Available Online from 11 September 2025

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