Turkish Journal of Computer and Mathematics Education ___________________________________________________________________________ 1694 Research Article Vol.12 No.6 (2021), 1694-1707 Hybrid and Adaptive P&O Maximum Power Point Tracking Techniques for PV Generation Systems Eman Eltaher a , Abdel-Raheem Youssef b and Essam E. M. Mohamed b a Upper Egypt Electricity Distribution Company, Luxor, Egypt; b Department of Electrical Engineering, Faculty of Engineering, South Valley University, Qena, Egypt Article History: Received: 10 November 2020; Revised 12 January 2021 Accepted: 27 January 2021; Published online: 5 April 2021 ________________________________________________________ Abstract: Maximum power point tracking (MPPT) techniques work to track the maximum power from the PV cell. A lot of conventional MPPT techniques, such as the perturb and observe (P&O), succeed in catch the maximum power point (MPP) with a good performance. However, they suffer many problems during fast varying weather conditions, where slow time response and high oscillations are dominant. Also, it is difficult to select the right direction for new steps. This article illustrates two new P&O MPPT techniques for PV generation systems. They operate on the power-voltage (P-V) curve under different weather conditions. The first is an adaptive perturb and observe (A-PO) technique, which changes the perturbation step-size adeptly to deal with the rapidly varying weather conditions. The second is a hybrid perturb and observe technique (H-PO), which uses a variable step-size according to the location of the operating point relative to the MPP. The MATLAB/SIMULINK software is used to study the truth of the proposed techniques. The results demonstrate that both techniques attain the MPP faster than the conventional techniques and at a reduced oscillation rate. ________________________________________________________ Heading 1: Introduction Since antiquated occasions, petroleum derivatives have been the world's principle wellspring of energy, regardless of their adverse consequences, ecological contamination, and being exposed to exhaustion. In ongoing many years, the quest for lasting elective fuel sources has become an overall issue. Environmentally friendly power sources (RES) are the arrangement where they are lasting and maintainable [1]. Among RESs, the photovoltaic (PV) energy change frameworks have an observable effect because of their protected activity, being harmless to the ecosystem, and convenience [2, 3]. but , low proficiency is the fundamental disadvantage, where it is in the scope of 9–17% just [4–6]. As of late, PV innovations have continually advanced in plan and control strategies to expand effectiveness [7]. maximum power point tracking (MPPT) methods have an extraordinary importance to create power from PV system. Where PV age frameworks rely upon climatic conditions. The MPPT is capable to extract most extreme power from the PV system in various climate conditions. Annoy and notice (P&O) is perhaps the most utilized MPPT procedures [8–10]. The P&O technique relies upon annoying the progression size and noticing the difference in extricated power until it arrives at the maximum power point (MPP). The P&O technique chooses a reasonable advance size to improve the PV framework execution. Conventional P&O (CPO) strategies utilize a fixed advance size, so they have a great deal of disadvantages. In the event that a step with large size is utilized, the speed following reaction is quick,