Implementación en tiempo real de estrategías de modulación de baja frecuencia de conmutación para filtros activos

Abstract

Active power filters (APF) have been proposed as an efficient solution to improve the power quality and reduce the harmonic distortion produced by non-linear loads and power generation units connected to the grid. For high-power medium-voltage APF, low-switching frequency modulators are preferred over standard carrier based-PWM, which often requires derating of the power converter current due to the high-switching losses. This PhD Thesis presents a closed-loop controller for high-power medium-voltage APFs, based on selective harmonic control - PWM (SHC-PWM), featuring a good trade-off between dynamic response, steady state performance and low-switching frequency. However, the SHC-PWM presents some challenges like the efficient calculation of the switching angles, the exponential increase of the size of the solution space when the number of low-order harmonics to control increases and the implementation of the closed-loop control system assuring a good balance between dynamic and stationary response. This PhD Thesis attempts to respond to these challenges and enables the development of active filtering applications that, due to the use of low-switching frequency modulation techniques, are competitive in terms of power density and cost.

Date of Award	2024
Original language	English
Awarding Institution	Universidad del País Vasco (UPV/EHU)
Supervisor	Asier Zubizarreta Pico (Supervisor) & Salvador Ceballos Recio (Supervisor)