An adaptive fuzzy logic controller for three-phase PWM boost rectifiers: design and evaluation under transient conditions

Fuzzy logic controllers (FC) have been implemented and studied on various types of static power converters. However, their improvement in converters' performance is not clear compared to classical control theory controllers. This is especially true in systems where precise models exist, such as the PWM boost rectifier (PWM-BR). Hence, another use of FC has ensued, which is to tune and adapt controllers synthesized by classical control theory. This paper takes advantage of this trend and proposes an adaptive fuzzy controller (AFC) which offers an improved dynamic response when compared to conventional FC. The AFC adaptive nature is achieved by modifying its normalizing factors, gains, and by using an inner AFC to adapt the output normalizing gain. Thus, the AFC is capable of reducing the PWM-BR overvoltage and settling time by 65% and 80% compared to a conventional FC. Consequently improving the switches' voltage utilization factor by 9.1%. The converter's fast response is attained by using a dynamic space vectors modulation that also improves the converter's voltage utilization by presenting a unity AC-DC gain. The paper presents a complete analysis and design procedure of the AFC and PWM-BR system, together with a detailed and thorough evaluation under transient conditions. All these show the feasibility of the proposed control scheme.

[1]  B.K. Bose,et al.  A fuzzy set theory based control of a phase-controlled converter DC machine drive , 1991, Conference Record of the 1991 IEEE Industry Applications Society Annual Meeting.

[2]  Longya Xu,et al.  On-line fuzzy tuning of indirect field-oriented induction machine drives , 1998 .

[3]  Rolando Burgos,et al.  Fuzzy logic controlled direct frequency converters modulated by an expert knowledge-based space vector technique , 1997, IAS '97. Conference Record of the 1997 IEEE Industry Applications Conference Thirty-Second IAS Annual Meeting.

[4]  S.-Y. Park,et al.  An analysis of boost rectifier , 1991, Proceedings IECON '91: 1991 International Conference on Industrial Electronics, Control and Instrumentation.

[5]  Geza Joos,et al.  Performance investigation of a current-controlled voltage-regulated PWM rectifier in rotating and stationary frames , 1995, IEEE Trans. Ind. Electron..

[6]  Humberto Pinheiro,et al.  Neural network-based controller for voltage PWM rectifier , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[7]  Jong-Woo Chui,et al.  New current control concept-minimum time current control in the three-phase PWM converter , 1997 .

[8]  Chi K. Tse,et al.  Development of a fuzzy logic controller for DC/DC converters: design, computer simulation, and experimental evaluation , 1996 .

[9]  Aurobinda Routray,et al.  A fuzzy self-tuning PI controller for HVDC links , 1996 .

[10]  Angelo Raciti,et al.  Fuzzy adaptive vector control of induction motor drives , 1997 .

[11]  Chuen-Chien Lee.  FUZZY LOGIC CONTROL SYSTEMS: FUZZY LOGIC CONTROLLER - PART I , 1990 .

[12]  Phoivos D. Ziogas,et al.  Generalized Functional Model for Three-Phase PWM Inverter/Rectifier Converters , 1987, IEEE Transactions on Industry Applications.

[13]  Seung-Ki Sul,et al.  Fast current controller in three-phase AC/DC boost converter using d-q axis crosscoupling , 1996 .

[14]  Seung-Ki Sul,et al.  Fast current controller in 3-phase AC/DC boost converter using d-q axis cross-coupling , 1996, PESC Record. 27th Annual IEEE Power Electronics Specialists Conference.

[15]  V. Blasko,et al.  A new mathematical model and control of a three-phase AC-DC voltage source converter , 1997 .

[16]  Geza Joos,et al.  A performance comparison of PWM rectifiers and synchronous link converters , 1994, IEEE Trans. Ind. Electron..

[17]  R. Wu,et al.  A PWM AC to DC converter with fixed switching frequency , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.