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This paper proposed a novel fault ride-through (FRT) configuration and transient management scheme to enhance the FRT capability of doubly fed induction generator-based wind turbines. The new configuration of the grid-side converter introduces shunt and series compensation for normal operation and voltage dips, respectively. A braking resistor is added to smooth switching transients from shunt to series interfaces and dissipate excessive power from the grid-side converter. To attain a flexible control solution for balanced and unbalanced fault conditions, the proposed transient management scheme employs positive and negative sequence controllers. A small-signal linear model is developed and examined to analyze the system dynamics for the series compensation topology. Based on the mathematical model, the controller is tuned to balance both voltage regulation performance and transient stability margins with consideration of various operating conditions. The combination of shunt and series interfaces demonstrates a low component count, simple protection structure, and improved performance of FRT with effective compensation to the electric grid. A comprehensive simulation verified the capability of the new configuration and transient management scheme.
Date of Publication: March 2013