Digital Control in Power Electronics

Abstract

This book presents the reader, whether an electrical engineering student in power electronics or a design engineer, some typical power converter control problems and their basic digital solutions, based on the most widespread digital control techniques. The presentation is focused on different applications of the same power converter topology, the half-bridge voltage source inverter, considered both in its single-and three-phase implementation. This is chosen as the case study because, besides being simple and well known, it allows the discussion of a significant spectrum of the more frequently encountered digital control applications in power electronics, from digital pulse width modulation (DPWM) and space vector modulation (SVM), to inverter output current and voltage control. The book aims to serve two purposes: to give a basic, introductory knowledge of the digital control techniques applied to power converters, and to raise the interest for discrete time control theory, stimulating new developments in its application to switching power converters.

Disturbance Calculation based on Space Vector Dot Product: Applications to Compensators

“…The coordinates φ a , φ b , φ c can be the line to neutral voltages v a , v b , v c defining the vector V, or the line currents i a , i b , i c defining the vector I. The proposed algorithm uses only variables in the abc coordinate system, but its explanation is more conveniently done in the αβ0 system defined in (11) (13) and shown in Fig. 2.…”

“…Current loop employs three digital proportional integral (PI) controllers (one for each phase), with the anti-windup algorithm presented in (11) . To avoid the well known loss of controllability of three-phase, three-wire converters using three independent controllers, this paper subtracts the instantaneous zero-sequence component, given by (i fa + i fb + i fc )/3, from the measured filter currents i fa , i fb , i fc .…”

Implementação de controladores para conversores trifásicos, sem transformações de coordenadas: análise geométrica através de vetores espaciais.

“…• a utilização da teoria pq para a obtenção dos sinais de referência dos compensadores (Buso et al, 2006), (Broeck et al, 1998), (Holmes, Lipo, 2003).…”

“…Comparada às alternativas implementadas no sistema dq ( (Buso, et al, 2006), (Hwang, et al 2010), (Zmood, et al, 2001), (Briz, et al, 2000)), a estratégia com F-1 controladores no sistema abc apresenta a vantagem de operar bem nos casos onde as referências de corrente ou as tensões da rede contêm componentes de seqüência negativa. Isso se explica pelo fato das seqüências positiva e negativa se apresentarem para os controladores individuais como sinais de freqüência fundamental ω .…”

“…Segundo (Buso , Mattavelli, 2006), (Broeck ET al, 1988), (Holmes, Lipo, 2003 (Fritzsche, 1978) (Buso, Mattavelli, 2006), (Broeck, et al, 1988) e (Holmes, Lipo, 2003 …”