Precise vector control of CSI fed induction motor drive

Abstract

SUMMARYA new, precise vector control algorithm for the current source inverter (CSI) fed induction motor drive is presented. The goal is to obtain the same performance that exists in PWM vector controlled drives. For that purpose, the problems of the existing vector controlled CSI fed induction motor drives are analyzed with the help of an adequate simulation model. For verification of the suggested algorithm, the prototype of the drive is developed. The frequency converter is a standard thyristor CSI and the complete control is implemented by software in the microcontroller. By eliminating the phase angle error and correcting the error of current magnitude the algorithm proposed in this paper can improve the dynamic performance of the CSI fed induction motor drive. The simulation and experimental results confirm the advantage of the proposed algorithm.

Torque Control of CSI Fed Induction Motor Drives

“…To overcome these disadvantages the phase error elimination and the reference current correction should be performed. In this chapter, the vector control algorithm that eliminates the two drawbacks is shown (Nikolic & Jeftenic, 2006). The suggested algorithm produces the performance of the CSI drive that exists in the PWM vector controlled drives.…”

“…19 the inputs are rotor flux and torque as in VSI presented in (Casadei et al, 2003), but now as a control variable the stator flux angle α s is used (Nikolic & Jeftenic, 2008). Although this configuration could remind on field-oriented control, the main difference is absence of coordinate transformation since it is not necessary to use coordinate transformation to achieve correct firing angle as in vector control of the same drive (Nikolic & Jeftenic, 2006). Identical result would be obtained when phase angle Φ s between d-q current references and rotor flux vector angle θ e = arctan(Ψ rβ /Ψ rα ) are summed and resulting angle α s is than used to determine sector of 60 degrees where resides rotor flux vector.…”

Discrete Current Control Strategy of Permanent Magnet Synchronous Motors

“…It is good at torque responding and speed accuracy, but the decoupling of flux and torque needs more focus to design regulator for both. The robustness will be vulnerable [2].…”

Direct torque control of a current source inverter fed induction motor

“…U petom poglavlju је dat opis koriscenog laboratorijskog prototipa pogona, detaljno prikazanog u [53]- [55]. Potomje izlozen upravljacki algoritam napisan u programskomjeziku С , uz naznacena unapredenja i razlike u odnosu na pojedine softverske module koji su korisceni za realizaciju vektorskog upravljanja predstavljenu u [55].…”

“…Ovako korigovan resolver је implementiran и vidи trodimenzionalne taЫice koja predstavlja zavisnost faktora korekcije od иgla komиtacije i faznog иgla koji se izracиnavajи za sve mogиce vrednosti referenci иzimajиci и obzir konstantno isd* i is * ograniceno na nominalnи vrednost [68].…”