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1 A vector modulated three-phase fourquadrant rectifier – application to a dc motor drive Matti Jussila Institute of Power Electronics Tampere University of Technology P.O. Box 692, FI-33101, Tampere, Finland [email protected] +358 3 3115 4257 Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 2 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Index Introduction Modulation of four quadrant rectifier (FQR) Simulation model Simulation results Conclusions Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 3 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Introduction Conventional current source PWM rectifier: Buck type rectifier Sinusoidal line current Two quadrant operation not suitable for all applications, e.g. for dc drives Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 4 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Introduction Four-quadrant PWM rectifier (FQR): Buck type rectifier Sinusoidal line current Four quadrant operation Six bidirectional switches Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 5 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Introduction Conventional four-quadrant dc motor drives: Antiparallel connected thyristor bridges: Non-sinusoidal line current Non-controllable power factor Four-quadrant dc-dc chopper Separate rectifier, e.g. diode bridge and brake resistor FQR: Sinusoidal line current with low harmonic distortion Good dynamic response Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 6 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Introduction Applications of FQR: Modernisation of dc drives: Only converters are replaced to attain better line current but (special) motors remain Line bridge of indirect matrix converter Three to two phase matrix converter Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 7 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Modulation of four quadrant rectifier Space vector modulation 2 3 sw i i i 2 3 iia aiib a 2iic , a = ej2/3 ii a dc aswb idc a 2 swc idc sw i idc Tδ mi sin θi Ts mi = |ii,ref| / |idc π Tγ mi sin θ i Ts 3 Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 8 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Simulation model Motor Table I Dc Motor Parameters Separately excited dc motor Constant field excitation vAr RAr iAr LAr diAr cr dt Nominal shaft power, Pn Nominal rotational speed, nn Nominal torque, Tn Nominal armature voltage, VAr,n Nominal armature current, IAr,n Nominal excitation current, Iexcitation,n Armature inductance, LAr Armature resistance, RAr 4.5 kW 1000 rpm 42.6 Nm 440 V 13.7 A 1.33 A 121 mH 9.5 Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 9 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Simulation model LC-filter L: 2% (2.3 mH) C: 11% (10F) Control system fs = 5 kHz iy,ref = 0 From the equation 2 of the active power: i vdc,ref idc kvdc,ref idc ix, ref 3vix Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 10 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Simulation results Load torque steps Constant speed 1000 rpm Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 11 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Simulation results Speed reference steps Constant load 42 Nm Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 12 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Simulation results Steady state Constant load 42 Nm & speed 1000 rpm Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 13 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Conclusions Space vector modulation of FQR can be derived from space vector modulation of current source rectifier FQR can be applied to dc drive Discrete control methods can be used FQR produces sinusoidal line current Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004 14 A vector modulated three-phase four-quadrant rectifier – application to a dc motor drive Extra Prototype Matti Jussila Institute of Power Electronics Nordic Workshop on Power and Industrial Electronics 2004 June 15th, 2004
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