Journal of Electrical Engineering www.jee.ro DESIGN OF A ROBUST CONTROLLERS FOR POWER ELECTRONICS CONVERTERS POWERED BY A HYBRID (PVG)/(WTG) POWER SYSTEM Mohamed Akram JABALLAH Dhafer MEZGHANI Laboratory of Analyse, conception and control of systems, Université Tunis El Manar, National School of Engineering of Tunis, Lab (LR11E20) jaballahakram@gmail.com , dhafer.mezghanni@gmail.com Abdelkader MAMI Faculty of Sciences of Tunis, Electronic Laboratory, Tunis, Tunisia abdelkader.mami@gmail.com Abstract: Wind and photovoltaic are the most major type of energy used to create hybrid power energy source. In a renewable energy conversion system, power electronics converters are used to charge storage batteries and to transform the dc current to alternative current and vice versa. In order to fully exploit the energy provided by both sources and ensure a very high efficiency, it is necessary to oblige the hybrid photovoltaic/wind system to produce the maximum possible power. For this, the use of MPPT methods is required. This paper presents a theoretical study and design of two MPPT controllers using to control a photovoltaic (PVG)/wind turbine generator (WTG) hybrid system. For the photovoltaic generator, a MPPT based on sliding mode technique (MPPTSMC), is adopted. In another hand, a MPPT based on a torque control (TC) is used to extract maximum power from the wind turbine generator. The proposed approach is designed using the PSIM software tools. The results of simulation show the effectiveness of this solution. Key words: (PVG)/(WTG) hybrid system, Buck converter, Three phase active rectifier, MPPT Sliding mode control (MPPTSMC), Torque Control (TC). 1. INTRODUCTION The wind and photovoltaic is the most environment friendly type of energy to use. The importance of utilizing the photovoltaic and wind turbine generator systems, has become apparent because electricity demand is rapidly growing all over the world, these two sources are among the greatest sources of renewable energy that have been increasing the four corners of the earth year after year. Photovoltaic and wind power sources allow an achievable form of power generation and are able to cover the load request. A system of energy production based on a photovoltaic/wind hybrid system can be used in two famous applications namely: standalone application [1], [2], [3] and grid- connected applications [4], [5]. In addition, a hybrid photovoltaic/wind system may also include power converters, a storage system and a control unit for load management. Nevertheless, to satisfy load demand, the system should present a good exploitation and a high general efficiency . For that, it is necessary to extract the maximum of power from the two energy sources. MPPT is an indispensable component of a hybrid photovoltaic/wind system. Various techniques of maximum power tracking have been considered in photovoltaic/wind power applications. For the photovoltaic generator (PVG), the perturbation and observation (P&O) method allows MPP tracking even in changing environmental conditions [6], [7]. For the wind turbine generator applications, various methods have been developed in [8], [9]-[20], [21], [22]. Sliding mode control is used, in many research 1