An accurate orthogonal signal generator for voltage control in synchronous reference frame of stand-alone single-phase voltage source inverters

This paper proposes a new adaptive orthogonal signal generator (OSG) for a stand-alone single-phase voltage source inverter (VSI) control in synchronous reference frame (SRF). Based on the adaptive linear neuron, the proposed OSG is able to achieve several main tasks. In addition to generating the orthogonal signal, the proposed OSG leads to filtering the original signal and the orthogonal signal; provides directly the direct and quadrature (dq) components in SRF; and identifies the harmonic residue of the output voltage. The harmonic residue compensation in the SRF voltage control scheme leads to improve significantly the output voltage quality. The suggested OSG is experimentally tested and compared with conventional and advanced OSGs. Obtained results are clearly proven its superiority. Thereafter, performances of the suggested SRF voltage control have been evaluated by means of simulations and experiments. Obtained results are shown insignificant steady-state errors and low harmonic distortions in the generated VSI output voltage. Originality of the proposed SRF voltage control lies in the filtering capability of the developed OSG. Therefore, the proposal yields to a simplified SRF voltage control with better performances. © 2021 Lavoisier. All rights reserved.