A New Discrete-Time Robust Adaptive Predictive Control-Based RMRAC Applied to Grid Connected Converters With LCL-Filter

Abstract

In this work, is developed a new discrete-time robust adaptive predictive control based on combining the adaptive structure of a Model Reference Adaptive Controller (RMRAC), to adjust gains online, with the control law One Sample Ahead Preview (OSAP), a particular case of deadbeat controller, for the current loop of a grid-connected voltage-source converter, also, this control not need resonant controllers to reject exogenous disturbances. A case application is presented, the grid-side currents control of a three-phase full-bridge static converter connected to the electrical grid by LCL filter. Simulation results are presented to show the performance of the proposed controller in a grid connected system.

A Performance Comparison of Discrete-Time Least Squares-Based Robust Model Reference Adaptive Control Approaches Applied on Grid-Side Current Control of Grid-Tied Power Converters by LCL Filter

“…As alternative, adaptive controllers have been proposed to due with grid impedance variation and variable operation points. Some interesting techniques were Revista Mundi, Engenharia e Gestão, Paranaguá, PR, v. 6, n. 2, p. 344-01, 344-20, 2021 DOI: 10.21575/25254782rmetg2021vol6n21533 proposed on (MASSING;PINHEIRO, 2010;MASSING et al, 2011;TAMBARA et al, 2013;TAMBARA et al, 2017;SILVEIRA et al, 2016), which are based on RMRAC (Robust Model Reference Adaptive Control). These approaches, besides dealing well with variable operating point, unmodelled dynamics and parametric variations, also reject exogenous disturbances without need conventional Proportional-Resonant Controllers, which are often used.…”