GCSC and TCSC Implementation in DFIG Based Wind Farms to Mitigate Sub Synchronous Resonance

Abstract

There is a significant increase in the usage of DFIG-based wind energy conversion systems due its advantages like its flexible speed operation, fractional rating power converters, and its reactive power sustenance. However, a wind farm with a doubly fed induction generator which is incorporated to the transmission line having a series compensation may give rise to the Sub Synchronous Resonance (SSR) issue. In a wind farm with series compensation, the SSR phenomena implies the potential concerns. The Sub synchronous control interaction issues have been caused due to the increased use of series compensation in DFIG-based wind farms. For SSCI, the non-periodic energy exchange amongst the network side and the generator side is the most significant cause. In this work, an investigation is performed on the applications of Gate-Controlled Series Capacitor (GCSC) and Thyristor Controlled Series Capacitor (TCSC), which is a series linked FACTS device which can be used for series compensation in fixed speed wind turbine generator systems. The transmission line series impedance can be quickly controlled by the GCSC and used for SSR dampening. To validate the findings, the simulations studies is performed using MATLAB/SIMULINK. Both GCSC and TCSC are capable successfully damping the SSR in wind farms and provide the better quality of power for the consumers.