DocumentCode :
1891713
Title :
A multi axis space phasor based current hysteresis controller for PWM inverters
Author :
Mistry, Vinay M. ; Waikar, S.P. ; Gopakumar, K. ; Umanand, L. ; Ranganathan, V.T.
Author_Institution :
Center for Electron. Design & Technol., Indian Inst. of Sci., Bangalore, India
Volume :
1
fYear :
1997
fDate :
26-29 May 1997
Firstpage :
480
Abstract :
In conventional three-phase current hysteresis controllers, the current error along the three phase axes are independently controlled. This will result in random selection of switching vectors causing high inverter switching losses. In this paper, a space phasor based multi axis current hysteresis controller is proposed, in which the current error along the orthogonal axes (jA, jB, jC) are monitored. The current error boundary is a hexagon. The proposed control scheme can be implemented using simple look up tables. The advantages of the proposed current hysteresis controlled PWM scheme, when compared to other multi level current hysteresis controllers, is that only the adjacent vectors close to the motor back EMF space phasor voltage, is only used for the inverter switching, for the entire speed range (optimum PWM switching). In the present scheme, the selection of the inverter voltage vectors for optimum PWM switching is achieved without any computation of the machine voltage space phasor, for the full speed range of the drive system. The proposed scheme is self-adapting, as far as the motor space phasor voltage is concerned, and also maintains the controller simplicity and quick response features of a hysteresis current controller. The scheme is simulated and also experimentally verified
Keywords :
AC motor drives; DC-AC power convertors; PWM invertors; adaptive control; control system analysis; control system synthesis; electric current control; hysteresis; machine control; machine testing; machine theory; self-adjusting systems; switching circuits; variable speed drives; vectors; velocity control; PWM inverters; back EMF space phasor voltage; control design; control performance; control simulation; controller simplicity; current error boundary; inverter voltage vectors selection; multi-axis space phasor; quick response; self-adapting control scheme; switching losses; switching vectors; three-phase current hysteresis control; Coils; Error correction; Frequency; Hysteresis motors; Monitoring; Pulse width modulation; Pulse width modulation inverters; Space technology; Switching loss; Voltage control;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Power Electronics and Drive Systems, 1997. Proceedings., 1997 International Conference on
Print_ISBN :
0-7803-3773-5
Type :
conf
DOI :
10.1109/PEDS.1997.618751
Filename :
618751
Link To Document :
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