Digital Control of a Three-Phase Four-Leg Inverter to Feeds Non-Linear Loads

ELIAS OGGIER; FERNANDO BOTTERON; JONATHAN E. OCHOA SOSA; GERMÁN G. OGGIER; GUILLERMO O. GARCÍA

IEEE LATIN AMERICA TRANSACTIONS

IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC

Lugar: New York; Año: 2020

1548-0992

This paper presents a new control strategy for three-phasefour-leg inverters, to meet the requirements of total andindividual harmonic content imposed by IEC 61000-2-2 whenthe inverter feeds a non-linear reference load defined by IEC 62040-3.The analysis and design of the controllers are based on a discrete-timemodel, developed in the αβ0 reference frame. The proposedcontrol strategy consists of an inner current control loop and anouter loop to control the phase voltages, using Proportional-Resonant controllers. The concept of harmonic impedance,proposed initially for single-phase inverters, is used to tune thecontrollers. Simulation and experimental results are presented tovalidate the harmonic impedance obtained and the design of theproposed control strategy when the inverter feeds non-linear loads.