An Enhanced Rotor Side Converter Control of DFIG-Based Wind Turbines for Improving LVRT Capability During Balanced Grid Faults
الموضوعات :
1 - Department of Electrical Engineering, Lenjan Branch, Islamic Azad University, Isfahan, Iran
الکلمات المفتاحية: Demagnetization control method, DFIG, LVRT, Balanced three-phase fault,
ملخص المقالة :
Among variable speed wind turbines the use of doubly-fed induction generator based wind turbines are very common. However, due to their stator direct connection to the grid, they are very sensitive to grid faults. This paper analyzes the low voltage ride-through (LVRT) capability enhancement under the three-phase balanced grid fault. Therefore the variations of 5 parameters during balanced grid fault are Analyzed. These parameters are stator voltage, rotor current, stator current, rotor speed, and the DC link voltage. To improve the LVRT capability an enhanced demagnetization control method is proposed. This method shortens the natural stator current time constant and approximately immunes the system against parameter variations as shown in simulation results. To show the effectiveness of the proposed method, the results are compared with one of the best previous demagnetization control methods.
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