Nonlinear decoupling of an induction motor drive with input filter

Performance and robustness evaluation of dc-link stabilization

“…Yet another stabilization approach suggested for motor drives in the literature is direct modification of the motor voltage reference (Mohamed et al, 2012;Delemontey et al, 1995;Hinkkanen et al, 2007;Lee and Sul, 2014). Since ac-motor voltage spacevectors contain two components, adaptation of the motor voltage reference offers some degrees of freedom.…”

“…Non-ideal reference tracking G c ≠1, on the other hand, is considered more often, see e.g. Bae et al (2001), Liu and Forsyth (2008b), Liu et al, (2008), Mohamed et al (2012) and Delemontey et al (1995).…”

“…been presented in Mosskull et al, (2007), Bae et al (2001), Sudhoff et al, (1998) and Walczyna et al, (1996) with induction motor (IM) drives, in Magne et al (2012), Awan et al (2009), Marx et al (2008), Liu and Forsyth (2008b) and Liu et al (2008) with permanent magnet synchronous motor (PMSM) drives and in Liu et al, (2007), Forsyth (2005, 2008a) with brushless dcmotor (BLDC) drives. In these contributions, stabilization is usually proven using root loci with linearized models of the closed-loop system, where internal power control dynamics either are included (Mosskull et al, 2007;Liu and Forsyth, 2008b;Liu et al, 2008Liu et al, , 2007Mohamed et al, 2012;Delemontey et al, 1995) or neglected Magne et al, 2012;Awan et al, 2009;Mosskull, 2014).…”

Stabilization of Induction Motor Drives With Poorly Damped Input Filters

“…Apart from perfect disturbance rejection, we also assume perfect reference tracking, i.e., T (t) = T ref (t), and substitute the stabilization expression (4) in the power balance (5). The relation between the dc-link current and dc-link voltage can then be linearized and the inverter can be modeled by (cf., Fig.…”

“…5 are stable, and we can use the simplified Nyquist stability criterion to examine the stability of the drive, i.e., the drive is stable if the Nyquist curve of the loop gain Y Z dc does not encircle point −1 in the complex plane. From a robustness point of view, it is advantageous to use a feedback model and the Nyquist stability criterion compared to the eigenvalue analysis that is performed in, e.g., [5], as, for example, time delays are easy to include. Similar approaches to stability analysis are taken for dc-dc converters in, e.g., [13] and for traction power supply grids in [19].…”