Robust Current Control of Grid-Tied Inverters Affected by LCL Filter Soft-Saturation

Author(s)

Dantas Osorio, Caio Ruviaro ^[1] ; Koch, Gustavo Guilherme ^[1] ; Pinheiro, Humberto ^[1] ; Oliveira, Ricardo C. L. F. ^[2] ; Montagner, Vinicius Foletto ^[1]

Affiliation

^[1] Fed Univ Santa Maria UFSM, Power Elect & Control Res Grp, BR-97105900 Santa Maria, RS - Brazil

^[2] Univ Estadual Campinas, Sch Elect & Comp Engn, UNICAMP, BR-13083852 Campinas, SP - Brazil

• Document type: Journal article
• Source: IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS; v. 67, n. 8, p. 6550-6561, AUG 2020.
• Web of Science Citations: 0

Abstract

This article provides as contribution a systematic design procedure for robust current control of grid-tied inverters with LCL filters affected by inductor magnetic soft-saturation and also by uncertain grid impedances. The proposed design is based on the following: first, a polytopic time-varying model to describe the effect of the inductances variations; second, a set of linear matrix inequalities to design fixed (robust) state feedback gains, ensuring bounded settling times for the closed-loop transient responses. A less conservative set of linear matrix inequalities is used to certify the procedure. Experimental results from real-time simulations and from a real prototype with commercial powder core inductors show that the proposed procedure can provide superior results than conventional controllers designed not taking into account the soft-saturation. The results with the proposed controller comply with the IEEE 1547 Standard, leading to grid currents with low harmonic content, respecting limits prescribed by this standard even under distorted grid voltages. (AU)

• FAPESP's process: 17/18785-5 - Parameter-Dependent Linear Matrix Inequalities Applied to Stability Analysis and Synthesis of Controllers and Filters for Uncertain Dynamic Systems
• Grantee: Pedro Luis Dias Peres
• Support type: Regular Research Grants