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The main advantage of the doubly fed induction generators (DFIG) over the synchronous generators is the small size converter which is located in the rotor circuit. However, this advantage can cause a problem during grid faults, because the over voltages and currents that will occur on the rotor circuit can damage the rotor side converter (RSC), if it is not over-dimensioned or protected for such high...
This paper deals with dynamic performance of wind diesel system with variable wind speed turbine. The quality of power supplied to the autonomous system is improved by controlling the frequency to the rated value. To improve the system characteristics, a variable speed operative wind generator: Doubly-Fed Induction Generator along with diesel generator in the isolated hybrid system is used. The simulation...
As the wind power penetration is increasing rapidly into the power grid, modern gird codes require the wind turbines (WTs) to possess the low voltage ride-through (LVRT) capability. In order to evaluate the performance of a WT under grid fault conditions, a voltage sag generator (VSG) is needed to simulate all kinds of grid faults. This paper investigates a three-phase programmable VSG based on a...
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