Title :
Hexagon Voltage Manipulating Control (HVMC) for AC Motor Drives Operating at Voltage Limit
Author :
Jul-Ki Seok ; SeHwan Kim
Author_Institution :
Sch. of Electr. Eng., Yeungnam Univ., Gyeongsan, South Korea
Abstract :
This paper proposes a hexagon voltage manipulating control (HVMC) method for ac motor drives operating at voltage limit. The command output voltage can be determined simply by the torque command and the hexagon voltage boundary in the absence of motor current-regulating proportional-integral (PI) control gains, additional flux weakening (FW) controllers, and observers for closed-loop control. These attributes reduce the time and effort needed for calibration of the controller in the nonlinear voltage-limited region. The proposed HVMC accomplishes the “true” maximum available voltage utilization, allowing for higher efficiency than that of the current vector controller (CVC) alone in the FW domain. In addition, a voltage selection rule was proposed to determine the unique HVMC solution between two possible voltage vectors. The successful application of the control approach was corroborated by a graphical and analytical analysis. The proposed control approach is potentially applicable to a wide range of control designs for ac drives.
Keywords :
AC motor drives; PI control; calibration; closed loop systems; control system synthesis; electric current control; machine control; magnetic flux; nonlinear control systems; torque control; voltage control; AC motor drive; CVC; FW controller design; FW domain; HVMC method; analytical analysis; closed loop control; command output voltage; controller calibration; current vector controller; flux weakening controller; graphical analysis; hexagon voltage boundary; hexagon voltage manipulating control; motor current regulating PI control; motor current regulating proportional-integral control; nonlinear voltage limited region; torque command; voltage vector; Couplings; Induction motors; Stators; Torque; Vectors; Voltage control; AC motor drives operating at voltage limit; Ac motor drives operating at voltage limit; hexagon voltage manipulating control (HVMC); maximum available voltage utilization;
Journal_Title :
Industry Applications, IEEE Transactions on
DOI :
10.1109/TIA.2015.2416125