Hysteresis control for a grid connected dual-buck inverter

• Main Authors: Mario Andrés Bolaños-Navarrete, Juan David Bastidas-Rodríguez, Gustavo Adolfo Osorio
• Format: Article
• Language: English
• Published: Universidad Industrial de Santander 2020-10-01
• Series: Revista UIS Ingenierías
• Subjects: dual-buck; microinverter; active power; hysteresis control
• Online Access: https://revistas.uis.edu.co/index.php/revistauisingenierias/article/view/10087

Single-phase inverters are widely used in different renewable energy applications. Although the full-bridge inverter is typically used, dual-buck inverters provide an important advantage, since they eliminate the shoot-through problems. However, solutions proposed in the literature require additional inductors, use linear controllers designed around an operation point, or cannot be used in grid-connected applications. This paper presents a hysteresis current control of a single-phase dual-buck full-bridge inverter for grid-connected active power injection. Includes the dynamical model in state variables, as well as analytical conditions to guarantee the evolution of the error dynamics in a set with boundaries defined by the designer. Moreover, the paper provides guidelines for the design of the dead band required for the transitions between the positive and negative semi-cycles (and vice-versa) of the grid voltage. Finally, simulation results validate the main features of the controller as well as the design of the dead band.