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<span lang="EN-US">The integration of the photovoltaic (PV) solar systems into distribution networks has brought new challenges to the network planners. One of the most interesting is to prevent the impacts of the PV intermittent character on the steady state system operation conditions. This work is aimed to investigate such effect on voltage performance, conventional generator daily behavior and automatic voltage regulator operation. Simulations were conducted on a 33-bus IEEE radial distribution power system. In order to provide a reliable study, a real PV power profile was considered. Obtained results over a period of 24 hours revealed that the PV integration contributes to an enhancement of the overall voltage profile, a considerable saving in the total amount of the produced active power and a reduction of power losses. However, the PV intermittent character causes significant transformation in buses voltages daily profiles as well as changes in production plan. To sum up, this paper reports the alterations, caused by the PV source intermittence, which must be taken into consideration by the distribution networks planners to maintain the overall network parameters within safe operating condition</span>

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The purpose of this paper is to validate a control scheme of a wind turbine in its full operating range. In order to fully validate a chosen approach, it is usually necessary to perform experimental tests on a system. Fortunately, today, simulation can be a very efficient way to evaluate engineering solutions. Indeed, it is possible to perform very advanced simulations using a model sufficiently detailed to go entirely through the effects of interactions between many factors affecting the operation of the wind turbine. Failure to perform proper interconnection studies can lead to false conclusions regarding the controllers design and could endanger operations on the real system. Numerical simulation tools developed specifically for power systems and dynamic modeling may be used but general purpose modeling software such as Matlab-Simulink is well suited to the task. This paper presents an integrated Matlab-Simulink simulation platform for a robust control of a wind energy conversion system based on a hybrid excitation synchronous generator (HESG).

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Setting up an experimental test bench for a large-scale wind conversion system (WCS) could be very challenging in terms of cost, size and complexity of the electrical and mechanical components especially in an academic research environment. Therefore, the aim of this paper is to establish an alternative through the development of a realistic simulation model. Such a model is essential for a better performances' assessment of the studied 1.5 MW aerogenerator, based on a Hybrid Excitation Synchronous Generator (HESG). A model of the WCS taking into account both complex electrical phenomena and aerodynamic behaviors is established using the code FAST. Two pitch controllers are proposed and investigated. The first one consists of a conventional PI regulator. As for the second one, it includes a PI-based fuzzy logic controller. The blades' loads, the low-speed shaft (LSS) torque ripple and loads are also given. Simulations results have confirmed the efficiency of the implemented fuzzy logic pitch controller and the capabilities of the developed model in simulating the behaviors of the modeled WCS in different operating regions.