Robust Repetitive Current Control of Two-Level Utility-Connected Converter using LCL Filter

Abstract

This paper investigates the implementation and performance limits of conventional and odd-harmonic repetitive controllers used for current control of two-level gridconnected inverter. This research is motivated by the relatively poor performance of classical (PI) controller when utility voltage has high harmonic distortion. Repetitive controllers (RCs) have the ability to track or reject periodic signals. However, their effectiveness is limited severely by the scarce bandwidth of the plant. To address this issue, the relationship between plant bandwidth and the converter's LCL filter is also investigated. In addition, the effects of variation in parameters of low-pass filter used in RC loop on the performance of the system are studied. Odd-harmonic repetitive controller (ORC) is used to overcome the excessive memory requirement in RC implementation. The performance of RC and ORC is tested for different total harmonic distortion (THD) values of utility voltage. The results show that RC improves steady state error and THD of the output current. Also, RC is found to be robust under variations in output-side inductance.

Design of Robust Higher-Order Repetitive Controller Using Phase Lead Compensator

“…The parameters are given in Table 1. The mathematical model of system is similar to [13]. The HORC offers substantially high gain at and around the tuned frequency 50 Hz and its harmonics.…”

“…To avert this problem, RC is employed. The detailed design of the RC for the two-level converter and its performance comparison with conventional RC is suggested in [13]. The RC successfully rejects harmonics in the grid, fulfilling the international standards of having a good quality of injected current.…”

Investigation of Photovoltaic Grid System under Non-Uniform Irradiance Conditions

“…The DC/AC converter is connected to the grid through an RL reactor, an RLC series filter to smooth current harmonics [17] and a step-up ∆-Y transformer to insulate the PV farm from zero-sequence current faults that might occur on the grid side. The AC/DC converter controls the PV voltage via MPPT algorithm [18], as well as the reactive power injected to the grid [19].…”