AVSF-based control algorithm of DSTATCOM for distribution system

Recent trends have shown that the power quality has been adversely affected due to increased power electronics based devices at the utility grid in the distribution system. Suppression of harmonics and reactive power current compensation at point of common coupling (PCC) improve the power quality using distribution static compensator (DSTATCOM). The development of new control algorithm based on adaptive Volterra second-order filter (AVSF) for DSTATCOM to extract the fundamental power current components from the polluted load current of non-linear load in distribution system is presented in this study. The AVSF is a combination of linear and non-linear functions of the input signals. Both linear and quadratic functions optimise filter coefficients with fast convergence, which is quite important in the success of an adaptive solution. The proposed algorithm is also related to autocorrelation matrix and step size, which are used for rapid convergence. The performance of proposed algorithm for DSTATCOM is validated through experimental results for unity power factor of AC source and zero voltage regulation of the terminal voltage at PCC.