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International audience; In this work, two desalination systems combined with a solar energy cycle, MED-PF and MED-PF-TVC are analyzed and evaluated thermo-economically. Solar energy is directly transferred from the solar collector field via the evaporator heat exchanger to MED-PF. In the second technique, the thermal energy produced is transmitted to the steam ejector of the MED-PF-TVC. The comparisons are handled according to 5000 m3/day of distilled product as a case study. A reduction in consumption and specific energy costs is possible due to the reduction in the value of the compression ratio and the increase in the number of evaporators.

Currently, the field of desalination is launched among the domains that are progressing significantly in the cycle of innovation and technological development on a global scale. In particular, the reverse osmosis (RO) desalination technique which is a technique of separation by dense membrane whose driving force is a pressure gradient. This process can be defined as a liquid-phase separation process (seawater or brackish water) by permeation through a highly innovative semi-permeable membrane with a very high freshwater surface productivity by stopping the molecules and the ions of salt and other residues and let water molecules pass through the application of transmembrane pressure which varies depending on the polarization layer of the membrane and the temperature of the system feed solution (Lilane et al., 2020) [1] . The pilot used in this experimental study has the objective of determining the resistance of the membrane, and of studying the effect of the transmembrane pressure on the productive mode of the system in the case of two types of supply solutions (pure and saline water).

In recent years, Even if the CSP industry (Concentrated Solar Power) has not been yet developed as it should be in Morocco, this country is attaching an increasing importance and have launched ambitious development goals by the year 2020. Many applications of CSP technology needs operating temperatures up to 300 °C [1] . These applications include water heat especially for domestic needs. The present article shows the results of a work about the development of a low-cost concentrator taking into account Moroccan socio-economic context. The system designed and developed a combination uses of two CSP technologies: Parabolic Dish and Linear Fresnel Concentrator. To develop the prototype, a simplified model was used to define the dimensions as well as the number of mirrors that compose the system. The system is autonomous, modular and makes it possible to concentrate the solar radiation with automatic tracking of the sun. A set of mirrors focus sunlight onto a fixed absorber located at a common focal point which is adjustable and allows connecting different types of absorbers. This paper is detailing the design of the devloped prototype. The system is innovative and operates at temperatures up to 250 °C. It is easy to meet the household hot water needs as per Moroccan natural conditions. The paper describes the modelling approach, presents the comparison of simulation results with real measurements and evaluates the results.

Nowadays, the most currently installed variable speed wind turbines based on Doubly Fed Induction Generator, due to main advantages such as high stability, improved power quality, high energy efficiency, controllability and mature control technology. In This paper, a modeling of Double-Fed Induction Generator (DFIG) and Direct Vector Oriented Field (DFOC) are presented, then the Proportional-Integral (PI). We developed the model for the simulation and the analysis of a double-fed induction generator to facilitate the electrical production control such as machine is considered. The results of simulations realized under the Matlab/Simulink software are analyzed and interpreted. The aim of this study is to apply the vector control independently of the active and reactive powers generated by the Doubly-Fed Induction Generator.

Morocco has two coasts, an Atlantic coast that stretches over 3000 km and a Mediterranean facade 500 km long which gives it a considerable maritime potential. It is committed to a policy of environmental preservation, the fight against global warming and the reduction of greenhouse gas emissions to promote all renewable energies [1] . The assessment of Morocco's maritime potential can be studied using marine information from sea currents, waves, wind, water temperature, water salinity and other types of parameters required for this diagnosis [2] . To do this, we used monthly data of sea currents, winds and surface temperature from the MARINE COPERNICUS site and processed by statistical methods using computer tools such as MATLAB software to highlight the main characteristics of our site facades: Atlantic and Mediterranean Sea in relation to the parameters studied to exploit them to study the possibilities of installation of marine renewable energies especially tidal energy.