Abstract
When a digitally controlled grid-connected inverter's control loop has a time delay, phase shifts occur, which may lead to instability. The performance of a quadruple-sampled state-variable-derivative deadbeat current controller (QSSVDDCC) was compared with that of a typical PI controller in this research work. The comparison was conducted using MATLAB simulations. Both of these controllers were tested for their ability to tolerate changes in grid parameters. When compared with the PI controller, the QSSVDDCC exhibited superior resilience during both steady-state and transient conditions in mitigating a time delay of about 120 mu s. Additionally, even at 80% grid-parameter variation, the QSSVDDCC demonstrated total harmonic distortion in current (THDi) of just 1.6%. It may be worthwhile to undertake an experiment to test the results of the simulations presented in this article further.