TY - JOUR
T1 - Comparison of prediction techniques to compensate time delays caused by digital control of a three-phase buck-type PWM rectifier system
AU - Nussbaumer, Thomes
AU - Heldwein, Marcelo Lobo
AU - Gong, Guanghai
AU - Round, Simon D.
AU - Kolar, Johann W.
PY - 2008/2
Y1 - 2008/2
N2 - The digital control of a three-phase three-switch buck-type rectifier system is analyzed in this paper. Three main sources of time delays in the control loop can be identified for the implementation on a digital signal processor (DSP): 1) the delay time due to the sampling of the control quantities; 2) the one due to the calculation time of the DSP; and 3) the one due to the sample-and-hold function of the pulsewidth modulator. Using the buck-type system as an example, the influence of the time delay on the stability of the inner current control loop is discussed, and two prediction methods for time-delay compensation, i.e., a linear prediction and the Smith prediction, are comparatively evaluated. The control performance and the effect of the delay times and the prediction methods are shown by simulation results and through measurements on a 5-kW prototype.
AB - The digital control of a three-phase three-switch buck-type rectifier system is analyzed in this paper. Three main sources of time delays in the control loop can be identified for the implementation on a digital signal processor (DSP): 1) the delay time due to the sampling of the control quantities; 2) the one due to the calculation time of the DSP; and 3) the one due to the sample-and-hold function of the pulsewidth modulator. Using the buck-type system as an example, the influence of the time delay on the stability of the inner current control loop is discussed, and two prediction methods for time-delay compensation, i.e., a linear prediction and the Smith prediction, are comparatively evaluated. The control performance and the effect of the delay times and the prediction methods are shown by simulation results and through measurements on a 5-kW prototype.
KW - Digital control
KW - Prediction techniques
KW - Pulse width modulation (PWM) rectifier
KW - Time-delay compensation
UR - http://www.scopus.com/inward/record.url?scp=40449121243&partnerID=8YFLogxK
U2 - 10.1109/TIE.2007.909061
DO - 10.1109/TIE.2007.909061
M3 - Article
AN - SCOPUS:40449121243
SN - 0278-0046
VL - 55
SP - 791
EP - 799
JO - IEEE Transactions on Industrial Electronics
JF - IEEE Transactions on Industrial Electronics
IS - 2
ER -