Using a Single-Phase AC-AC Converter Controlled by a Passivity-based Law to Voltage Sags and Swells Compensation

This paper presents the analysis and design of a passivity-based controller (PBC) that can be used by a single-phase AC-AC converter to voltage sags and swells compensation. The parameters of the non-linear controller are chosen taking account the operation features of the converter. The response velocity as well as a fast stabilization time and implementation are considered. A model of the system is presented in order to know the behavior of the single-phase AC-AC converter and to validate the proposed control law. It can be noted that the use of the PBC in the system permits to keep a high and continuous regulation in its output voltage and it has the capability to compensate up to 25% voltage sags and 50% voltage swells. In this case, a DSP and a FPGA are used to program the passivity-based controller and to determine the state of the switches respectively. The performance of a 5 kVA-127 V, 60 Hz, single-phase AC-AC converter with the selected controller is presented by means of simulation and experimental results, which verify the viability of the proposed approach