Optimizing current control performance in double winding asynchronous motors in large power inverter drives

Abstract

The operation of ac drives in applications requiring high overload capability imposes hard working conditions on the electronic switching devices. The use of induction motors with two stator windings, fed by two inverter modules, allows large power rating in variable speed drives for high performance applications. This paper shows the structure and the main features of a fieldoriented control for a double winding motor, fed by two GTO inverters.The operational results of a 850 kW drive, working as a melt pump in a polyethylene plant, are reported in order to describe the obtained performances.

Decentralized Control of a Nine-Phase Permanent Magnet Generator for Offshore Wind Turbines

“…This transformation is extended for three stators, considering the electrical angle displacement between them [11], [23]:…”

“…It is designed considering that no communications are available between stators, thus three different vector controllers are designed, one for each stator. To do so, the equations for one stator are extracted from the total machine model (9), considering only the variables of the same stator, painted in gray in (11):…”

“…Different approaches to control the multi-star machine currents have been proposed in the literature [9]. The classical vector control can be extended for multiphase machines [9] considering that each FPC converter is able to regulate its corresponding three-phase stator current, even including a centralized controller able to decouple the effects between stators [10], [11], [12]. In order to apply this decoupling, fast communications between converter controllers or a centralized control is required.…”

“…If fast communications between converters or a centralized controller are available, control approaches able to decouple the interaction between stators may be implemented [10], [11], [12], due to their notable performance. However, if these communications fail or the bandwidth is not high enough to compensate the stator couplings, the system could be still controlled with the proposed decentralized strategy, ensuring a proper behavior.…”

Design of Coupling Cancellation Control for a Double-winding PMSM

“…It is known that this coupling may bring interference between the windings, and affects the control performance of the multiwinding motor (4) . For induction motors, a motor model for double-winding motor was proposed, and decoupling method on the model was examined (5)- (8) . For PMSMs, basic voltage equation for double-winding motor was presented (9) , and the equation with phase shift between the windings (10) , and also detailed motor model with spatial harmonics (11) (12) have been discussed.…”