Enhanced DSOGI-PLL Based Control Strategy for DSTATCOM

Abstract

A self-excited induction generator (SEIG) is highly preferred in standalone wind power generation systems due to its robust structure. In order for the voltage and frequency generated by SEIG to be stable and constant, active and reactive power control is required. For this purpose, DSTATCOM is widely used. The effectiveness of the performance of DSTATCOM depends on the control algorithm used. The control algorithm generates reference currents using load currents, SEIG voltages, and frequency. When the SEIG is fed with nonlinear and unbalanced loads, if the load currents are not well filtered, the active components, reactive components, and frequency can be misestimated. In this paper, an enhanced DSOGI-PLL based control algorithm with superior filtering capability is proposed for voltage and frequency control of SEIG. The proposed algorithm is tested under nonlinear load and nonlinear unbalanced load conditions. The results clearly demonstrated the superiority of the EDSOGI-PLLL based algorithm.