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Low-voltage ride-through (LVRT) capability enhancement of DFIG-based wind farm by using bridge-type superconducting fault current limiter (BTSFCL)

Firouzi Mehdi, Kartijkolaie Hossein Shahbabaei, Radmehr Masoud

Journal of Power Technologies

2019

Vol. 99, nr 4

245--253

Integration of large-scale wind power plants (WPPs) in power systems faces high short circuit current and low-voltage ridethrough (LVRT) challenges under fault condition. The use of superconducting fault current limiters (SFCLs) was found to be a promising and cost effective solution to solve these problems. This paper presents a theoretical analysis of Bridge-type SFCL (BTSFCL) performance supported by PSCAD/EMTDC based simulation to enhance the LVRT capability of doubly-fed induction generator (DFIG)-based WPPs. It suppresses the transient fault current without any delay time and prevents from instantaneous voltage sag in the connecting point at fault inception time. The main advantages of BTSFCL are: simplicity, high reliability and automatic operation under fault condition for enhancing the LVRT performance. The studied WPP is modeled based on an aggregated doubly-fed induction-generator (DFIG) wind turbine. Simulation results reveal that BTSFCL limits the transient short circuit current contribution of WPP and enhances the LVRT capability of the DFIG-based WPP. Also, the performance of BTSFCL is compared with the static synchronous compensator (STATCOM) for enhancing the LVRT capability.

Research on the Direct Power Control Based Multi-objective Control for DFIG Asymmetrical LVRT

Ma H., Xu L., Li Y.

Przegląd Elektrotechniczny

2013

R. 89, nr 3b

53--56

This paper proposes a novel control strategy for doubly fed induction generator (DFIG) low voltage ride through (LVRT) under asymmetrical grid voltage dip. The proposed strategy, named as direct power control based multi-objective control, enables the DFIG operating under asymmetrical grid voltage dip and operating at different control objectives (the current distortion limitation mode, the power oscillation limitation mode and the torque oscillation limitation mode) by adjusting only one parameter. Furthermore, the proposed method can achieve a smooth switch between the steady state operation and the voltage dip operation with an improved dynamic performance. The simulation results verify the correction and effectiveness of the proposed method.

W artykule przedstawiono nową metodę sterowania generatorem DFIG, pracującym przy przejściowo niskim napięciu. Proponowany algorytm umożliwia pracę w takich warunkach, poprzez zmianę nastawy tylko jednego parametru. Osiągnięto płynność przejścia między stanem ustalonym a stanem zapadu napięcia. Przedstawiono wyniki badań symulacyjnych, potwierdzające skuteczność rozwiązania.