Adaptive hysteresis band control for constant switching frequency in DTC induction machine drives
It is fairly well known that direct torque control (DTC) exhibits fast dynamic torque response, a property that originates in the fact that torque and flux is directly controlled by instantaneous space voltage vector, unlike field-oriented control. For this reason direct torque control gradually has...
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Veröffentlicht in: | Elektrik : Turkish journal of electrical engineering & computer sciences 2010-01, Vol.18 (1), p.59-69 |
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Format: | Artikel |
Sprache: | eng |
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Zusammenfassung: | It is fairly well known that direct torque control (DTC) exhibits fast dynamic torque response, a property
that originates in the fact that torque and flux is directly controlled by instantaneous space voltage vector,
unlike field-oriented control. For this reason direct torque control gradually has been used in the field, eliciting
quick response and high efficiency since its introduction in the mid-1980s. Conventional fixed band hysteresis
control has several problems. One of these is variable switching frequency, which causes serious problems
in DTC. In this paper, an adaptive hysteresis band control strategy is proposed, where the hysteresis band
is controlled in real time as variation of applied voltage vectors, thereby reducing the torque ripple whilst
maintaining a constant torque switching frequency. The proposed adaptive hysteresis band control technique
is verified by simulations. The system is first simulated by using the program Matlab and tested by hardware
in the loop. Then, it is implemented in hardware based on a TMS320C6711, 32-bit fixed-point digital signal
processor. Experimental results prove the feasibility of the proposed strategy compared with conventional
method. |
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ISSN: | 1303-6203 1300-0632 1303-6203 |
DOI: | 10.3906/elk-0812-5 |