Comparison of Prediction Techniques to Compensate Time Delays Caused by Digital Control of a Three-Phase Buck-Type PWM Rectifier System

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.

[1]  Joachim Holtz,et al.  High-bandwidth current control for torque-ripple compensation in PM synchronous machines , 1998, IEEE Trans. Ind. Electron..

[2]  V. Blasko,et al.  Sampling of discontinuous voltage and current signals in electrical drives: a system approach , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[3]  Daniel Mitchell,et al.  Pulsewidth modulator phase shift , 1980, IEEE Transactions on Aerospace and Electronic Systems.

[4]  R. Kennel,et al.  Predictive control of inverter supplied electrical drives , 2000, 2000 IEEE 31st Annual Power Electronics Specialists Conference. Conference Proceedings (Cat. No.00CH37018).

[5]  David W. Clarke,et al.  Generalized predictive control - Part I. The basic algorithm , 1987, Autom..

[6]  Daniel John Tooth.  The behaviour and analysis of a three-phase AC-DC step-down unity power factor converter , 1999 .

[7]  Marian P. Kazmierkowski,et al.  Direct torque control of PWM inverter-fed AC motors - a survey , 2004, IEEE Transactions on Industrial Electronics.

[8]  G. Marques.  A PWM rectifier control system with DC current control based on the space vector modulation and AC stabilisation , 1998 .

[9]  U. Drofenik,et al.  New wide input voltage range three-phase unity power factor rectifier formed by integration of a three-switch buck-derived front-end and a DC/DC boost converter output stage , 2000, INTELEC. Twenty-Second International Telecommunications Energy Conference (Cat. No.00CH37131).

[10]  Ehab F. El-Saadany,et al.  An Improved Deadbeat Current Control Scheme With a Novel Adaptive Self-Tuning Load Model for a Three-Phase PWM Voltage-Source Inverter , 2007, IEEE Transactions on Industrial Electronics.

[11]  J.W. Kolar,et al.  Control-oriented modeling and robust control of a three-phase buck+boost PWM rectifier (VRX-4) , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[12]  Giuseppe Buja,et al.  Direct torque control of an induction motor using a single current sensor , 2006, IEEE Transactions on Industrial Electronics.

[13]  Marian K. Kazimierczuk,et al.  Voltage-Loop Power-Stage Transfer Functions With MOSFET Delay for Boost PWM Converter Operating in CCM , 2007, IEEE Transactions on Industrial Electronics.

[14]  M. Liserre,et al.  A comparison between two predictive controllers for single-phase active filter , 2003, IECON'03. 29th Annual Conference of the IEEE Industrial Electronics Society (IEEE Cat. No.03CH37468).

[15]  Paolo Mattavelli,et al.  Comparison of current control techniques for active filter applications , 1998, IEEE Trans. Ind. Electron..

[16]  Thomas Nussbaumer,et al.  Comparative Evaluation of Control Techniques for a Three-Phase Three-Switch Buck-Type ACto-DC PWM Converter System , 2022 .

[17]  Dariusz Czarkowski,et al.  Modeling and Digital Control of a Phase-Controlled Series–Parallel Resonant Converter , 2007, IEEE Transactions on Industrial Electronics.

[18]  Donald Grahame Holmes,et al.  Implementation of a direct digital predictive current controller for single and three phase voltage source inverters , 1996, IAS '96. Conference Record of the 1996 IEEE Industry Applications Conference Thirty-First IAS Annual Meeting.

[19]  Johann W. Kolar,et al.  Improving mains current quality for three-phase three-switch buck-type PWM rectifiers , 2006, IEEE Transactions on Power Electronics.

[20]  J. Rodriguez,et al.  Predictive Torque Control for Inverter-Fed Induction Machines , 2005, IEEE Transactions on Industrial Electronics.

[21]  O. J. M. Smith,et al.  A controller to overcome dead time , 1959 .

[22]  Mario Pacas,et al.  A predictive torque control for the synchronous reluctance machine taking into account the magnetic cross saturation , 2005 .

[23]  Eduardo F. Camacho,et al.  Introduction to Model Based Predictive Control , 1999 .

[24]  Johann W. Kolar,et al.  Design and Comparative Evaluation of Three-Phase Buck+Boost and Boost+Buck Unity Power Factor PWM Rectifier Systems for Supplying Variable DC Voltage Link Converters , 2004 .

[25]  Marian P. Kazmierkowski,et al.  Current control techniques for three-phase voltage-source PWM converters: a survey , 1998, IEEE Trans. Ind. Electron..

[26]  D MiddlebrookR,et al.  Predicting modulator phase lag in PWM converter feedback loops. , 1981 .

[27]  Stéphane Bibian,et al.  Time delay compensation of digital control for DC switchmode power supplies using prediction techniques , 2000 .

[28]  M. Pacas,et al.  Predictive direct torque control for the PM synchronous machine , 2005, IEEE Transactions on Industrial Electronics.