Resilient control scheme for LVRT enhancement in DFIG system with thyristor-contolled LC compensator

Abstract

This paper presents a multi-functional thyristor-controlled LC (TCLC) compensator for en- hancement of low voltage ride through (LVRT) capabil- ity of wind farms and active power flow management along with grid current harmonic mitigation. The pro- posed TCLC controller designed on generalized reactive power theory, enables the compensator to deliver reac- tive power in case of severe voltage dip during fault condition. It also controls the flow of active power under normal circumstance. In the presence of har- monics in the utility grid, the TCLC compensator can act as harmonic compensator. The compensator ele- ments have been designed depending on the range of injected reactive power and harmonic current rejection analysis. Simulation results and comparative assessme nt establish the improved performance of the compen- sator over other state-of-the-art techniques for LVRT improvement. Results obtained from the real-time dig- ital simulator (RTDS) prove the efficacy and reliability of the TCLC compensator.