الفهرس 
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Abstract
Recently, sustainable attention has been drawn to renewable energy sources. Wind and solar energy are considered as the most important sources for renewable energy. Wind energy systems as renewable source of energy have been extensively studied because of its benefits as an environmentally friendly clean energy, inexhaustible, safe and a low-cost for long term. Because of its unpredictable availability, power management control systems are essential to extract as much power as possible from the wind during its availability durations.
The Controner i.s i.nvolved in almost all dec\s\<.)l\-\1.\’O.k\wg, processes in the safety systems in a wind turbine. At the same time it must oversee the normal operation of the wind turbine and carry out measurements. The controller measures many parameters as analogue signals and also measures other parameters as digital signals. The control board contains many interface circuits for several sensors located inside the turbine. This thesis is motivated for proposing the design of main interface circuits for a control board of wind turbines. The interface circuits design is detennined depending on the nature of the output signals of the sensors, whether a change in voltage, current, resistance or frequency. And also is motivated for proposing the main control algorithm for wind turbines.
The proposed main algorithm contains several sub algorithm models (strategies) for power control, pitch control, status checking, starting, grid connection, normal and emergency shutdown that are studied, designed and also, tested under operation. The testing phase shows that in the high wind speed range, the pitch control seems the most relevant to release a power margin. While in the low wind speed range, the increase of the rotation speed is more convenient.
A stand-alone system is defined as an autonomous system that supplies electricity without being connected to the electric grid. Hybrid systems combined renewable energy source, that are never depleted (such solar (photovoltaic (PV)), wind, hydroelectric, etc.) , With other sources of energy, like Diesel. If these hybrid systems are optimally designed, they can be more cost effective and reliable than single systems. However, the design of hybrid systems is complex because of the uncertain renewable energy supplies, load demands and the non-linear characteristics of some components, so the design problem cannot be solved easily
.:;’ c\~~~i~~\J opti~~\~ati~n method~. ~he use of. heuristic
techniques, such as the genetic algonthms, can glVe better results than classicalluethods.
This paper presents to a hybrid system control algorithm and also dispatches strategy design in which wind is the primary energy resource with photovoltaic cells. The main task of the proposed algorithm is to take full advantage of the wind energy and solar energy when it is available and to minimize diesel fuel consumption.