Abstract
A micro-grid consisting of a 300kW wind turbine and a 40kW photovoltaic array is investigated under extreme operating gust (EOG) wind scenarios. The micro-grid is connected to the 380-V utility through a utility-side converter using natural-frame control, which provides a constant voltage of the DC link between the micro-grid and utility. The impact of the extreme gust wind variations on the micro-grid performance is studied for variable speed wind energy system equipped with a squirrel-cage induction generator. The Hurghada city, Red Sea, Egypt is taken as a case study for the wind speed profile. A detailed model of extreme gust-wind speed variation is implemented and simulated using PSIM commercial software package, based on climate characteristics of Hurghada city. The indirect rotor field oriented control (FOC) method is implemented to the generator-side converter to keep the system stable under the extreme gust wind conditions and to control the squirrel-cage induction generator (SCIG) speed for maximum power-point tracker (MPPT) regime. Power quality of the utility-side converter in terms of operation at different power factors, voltage value and THD are verified.
Highlights
The demands of energy around the world increase rapidly, and the need for a renewable energy supply has been increased
The robustness of the power electronics converter is validated under the extreme gust wind conditions and the converters are found to be robust against wind speed variations
The wind classes are mainly defined by the average annual wind speed that is measured at the turbine hub height, the speed of extreme gusts that could occur over N years, and how much turbulence there is at the wind site
Summary
The demands of energy around the world increase rapidly, and the need for a renewable energy supply has been increased. These new energy sources will not harm the environment or human being. Renewable energy sources currently supply about 15% to 20% of total world energy demand [2,3,4]. It is expected that about 30% contribution to world energy supply from renewable energy resources by year 2020 [1]. The squirrel-cage induction generator (SCIG) has advantages like simplicity, low cost, rugged, high efficiency, maintenance-free, rigid and brushless These advantages make the induction machine very attractive for wind power applications both for fixed and variable speed operation [7]. There are four classes for wind turbine
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