Deadbeat Flux Vector Control as a One Single Control Law Operating in the Linear, Overmodulation, and Six-Step Regions With Time-Optimal Torque Control

• Published in: IEEE open journal of industry applications Vol. 3; pp. 247 - 270
• Main Authors: EL KHATIB, HADI, GERLING, DIETER, SAUR, MICHAEL
• Format: Journal Article
• Language: English
• Published: New York IEEE 2022; The Institute of Electrical and Electronics Engineers, Inc. (IEEE)
• Subjects: Algorithms; Control algorithms; Control systems; Control theory; Controllers; Decoupling; Direct torque and flux control; Dynamic stability; Electric potential; flux trajectory; flux weakening; Mathematical analysis; Microcontrollers; Modulation; overmodulation (OVM); permanent magnet synchronous machine; Pulse duration modulation; Pulse width modulation; six-step operation; Time optimal control; Torque; Torque control; traction applications; Trajectory; Transient performance; Voltage; Voltage control
• ISSN: 2644-1241; 2644-1241
• DOI: 10.1109/OJIA.2022.3222852

This article proposes an enhanced version of the deadbeat flux vector controller (DBFC) as a one single control law that can operate in the entire torque-speed plane. The operation at any feasible modulation index can be accomplished by adequate determination of the flux trajectories at the different operating regions (e.g., PWM, overmodulation (I and II), and six-step). Continuous and seamless transition between the four operating regions is guaranteed, where the modulation index changes linearly with speed between PWM and six-step (without abrupt change in torque or acoustic problems). With the proposed strategy, undesirable torque dynamics, stability problems, and increased computational efforts associated with using multiple control laws are avoided. The transient performance of DBFC at the maximum voltage limit is analyzed in detail in the flux plane. A time-optimal torque control algorithm is developed to achieve the fastest possible torque dynamics and to considerably reduce the settling time, without the use of a voltage margin. The torque can be controlled with high accuracy and high robustness to machine parameter variations. With DBFC, no tradeoff between good steady state six-step behavior and good transient performance is needed due to the decoupling of switching and calculation frequencies. The proposed DBFC controller offers valuable features, and it is simple to implement. Simulation and experimental results are provided to validate the proposed control algorithm, which is implemented on an automotive microcontroller with a high-power/high-performance automotive traction machine.