Abstract
This paper presents an improved control strategy for both the rotor side converter (RSC) and grid side converter (GSC) of a doubly fed induction generator (DFIG)-based wind turbine (WT) system to enhance the low voltage ride through (LVRT) capability. Within the proposed control strategy, the RSC control introduces transient feed-forward compensation terms to mitigate the high frequency harmonic components and reduce the surge in the rotor currents. The proposed GSC control scheme also introduces a compensation term reflecting the instantaneous variation of the output power of the rotor side converter with consideration of the instantaneous power of grid filter impendence to keep the dc-link voltage nearly constant during the grid faults. To provide precise control, non-ideal proportional resonant (PR) controllers for both the RSC and GSC current regulation are employed to further improve dynamic performance. Simulations performed in Matlab/Simulink verify the effectiveness of the proposed control strategy.
Highlights
Wind energy generation has been noted as the most rapidly growing renewable energy technology.The increasing penetration level of wind energy can have a significant impact on the grid, especially under abnormal grid voltage conditions
This paper extends the initial study presented in [22] and proposes an improved control strategy for both the rotor side converter (RSC) and grid side converter (GSC) to enhance the low voltage ride through (LVRT) capability of the doubly fed induction generator (DFIG) wind turbine (WT) by suppressing the surge and harmonics in the rotor current and the fluctuation of the dc-link voltage at the same time
The proposed control strategy introduces the transient feed-forward compensation terms in the RSC control loops and the instantaneous rotor power fluctuation compensate terms in the GSC control loops, which are derived from the accurate transient control model of DIFG WT system
Summary
Wind energy generation has been noted as the most rapidly growing renewable energy technology. The use of a dynamic voltage restorer and superconducting fault-current limiter-magnetic energy storage system to enhance the LVRT capability of DFIG during grid faults were investigated recently in [13,14], respectively. These approaches require installing extra hardware in the DFIG WT system, which will increase the costs and decrease the system reliability. This paper extends the initial study presented in [22] and proposes an improved control strategy for both the RSC and GSC to enhance the LVRT capability of the DFIG WT by suppressing the surge and harmonics in the rotor current and the fluctuation of the dc-link voltage at the same time.
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