Indonesian Journal of Electrical Engineering and Computer Science Vol. 36, No. 3, December 2024, pp. 1389~1399 ISSN: 2502-4752, DOI: 10.11591/ijeecs.v36.i3.pp1389-1399  1389 Journal homepage: http://ijeecs.iaescore.com Improved direct control of single stage photovoltaic powred system Rahli Chouaib, Mehdi Ouada, Mebarek Abdesslam Ryad, Salah Saad Laboratory of Electromechanical Systems, Department of Electromechanical Engineering, Faculty of Technology, Badji Mokhtar University, Annaba, Algeria Article Info ABSTRACT Article history: Received Apr 6, 2024 Revised Aug 17, 2024 Accepted Aug 26, 2024 This paper introduces a novel direct control quasi-Z-source inverter (qZSI) topology as a viable alternative to conventional two-stage converters in photovoltaic (PV) systems. The proposed control strategy effectively merges duty cycle and modulation index within a space vector pulse width modulation (SVPWM) framework for both DC and AC control. To assess the system’s performance under diverse weather conditions, the INC and P&O maximum power point tracking maximum power point tracking (MPPT) algorithms are employed. Rigorous simulations conducted using MATLAB/Simulink demonstrate the proposed method’s ability to achieve multi-objective optimization of PV systems, enhancing overall system efficiency and reliability. Keywords: Direct Control MPPT Optimization Photovoltaic Quasi-Zsi This is an open access article under the CC BY-SA license. Corresponding Author: Mehdi Ouada Laboratory of Electromechanical Systems, Department of Electromechanical Faculty of Technology, Badji Mokhtar University C. P. 23000. Annaba, Algeria Email: mehdi.ouada@univ-annaba.dz 1. INTRODUCTION The importance of sustainable energy has increased in recent times due to the depletion of the ozone layer and energy prices [1]. For these reasons and more, most developed countries have turned to renewable energy sources, which improve air quality, create jobs and reduce greenhouse gas emissions [2], [3]. Solar and wind power, two of the most popular sources of sustainable energy [4], [5] have had a significant impact on the growth of the industry by making renewable energy more affordable and competitive with traditional fuels. A complete switch to green energy is now possible thanks to the rapid growth of renewable energy sources, but there are still many hurdles to overcome [6], [7]. Photovoltaic (PV) conversion of solar energy stands out as one of the most effective and promising technologies [8]. Traditionally, PV systems have relied on a two-stage conversion process, incorporating both DC/DC and DC/AC stages. However, this approach presents challenges in terms of efficiency and system complexity. The Z-source inverter (ZSI) has emerged as a compelling solution, offering a multi-objective optimization for PV systems [9]. This innovative technology allows for single-stage power conversion while simultaneously enabling maximum power point tracking (MPPT) control, thereby optimizing energy conversion. Furthermore, the ZSI contributes to improving the overall reliability of PV systems, addressing a critical concern in renewable energy deployment.