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3 Phase Power Factor Correction (PFC)
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3 Phase Power Factor Correction (PFC)

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Power Factor is a measure of how efficiently electrical power is consumed. In the ideal world Power Factor would be unity (or 1). Unfortunately in the real world Power Factor is reduced by highly ...

Power Factor is a measure of how efficiently electrical power is consumed. In the ideal world Power Factor would be unity (or 1). Unfortunately in the real world Power Factor is reduced by highly inductive loads to 0.7 or less. This induction is caused by equipment such as lightly loaded electric motors and fluorescent lighting ballasts and welding sets, etc. Three phase power factor can be corrected using different approaches like sine wave control, vector control, single cycle control or Vienne Bridge Rectifier.

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3 Phase Power Factor Correction (PFC) 3 Phase Power Factor Correction (PFC) Presentation Transcript

  • copyright 2011 controltrix corp www. controltrix.comwww.controltrix.comThree Phase PFC system
  • copyright 2011 controltrix corp www. controltrix.comTopologies and control approaches• 3 phase 6 controlled switch - sine wave control• 3 phase 6 controlled switch - vector control• Single cycle control• Vienna bridge
  • copyright 2011 controltrix corp www. controltrix.comSine wave control• 6 controlled switches (MOSFETS, IGBTs ) are used• Current shape may be made to track the voltage shapeOR• Current shape may be made to track a sine wave• 10 KHz switching frequency and 50-60 Hz no problem (higherfrequency may pose challenge)
  • copyright 2011 controltrix corp www. controltrix.comSine wave control.• Bi-directional operation possible• SVM allows smaller DC voltages to be achieved (15 % lesser)• 3 input voltage sensing (potential divider)• 2 phase current sensing (hall effect based or shunt + diffamplifier based) required• 3 extra inductors
  • copyright 2011 controltrix corp www. controltrix.comVector control• 6 controlled switches (MOSFETS, IGBTs) are used• Complicated control (modified motor drive system fig. below)
  • copyright 2011 controltrix corp www. controltrix.comVector control• Current shape only tracks a sine wave• 10 KHz switching frequency and 50-60 Hz no problem (higherfrequency may pose challenge)• Bi directional operation possible• Harmonics in input voltage leads to problems• Complicated code
  • copyright 2011 controltrix corp www. controltrix.comVector control.• Required when higher frequency sine wave input is used 3extra inductors• 2 phase current sensing (hall effect based or shunt + diffamplifier based) required• Voltage Zero cross detection• Phase lock loop for electrical phase angle tracking• Best dynamic performance under rapidly fluctuating source
  • copyright 2011 controltrix corp www. controltrix.comSingle cycle control• Unidirectional operation (AC to DC conversion) only• Simple code structure• Simple operation• Currents automatically track the voltages• 6 switch inverter topology
  • copyright 2011 controltrix corp www. controltrix.comSingle cycle control• PF degrades at lower load in single phase.(stays near ~ 0.99 for 3 phase systems)• 3 extra inductors• 3 input voltage sensing (potential divider)• 2 phase current sensing (hall effect based or shunt + diffamplifier based) required
  • copyright 2011 controltrix corp www. controltrix.comVienna Bridge Rectifier
  • copyright 2011 controltrix corp www. controltrix.comVienna Bridge Rectifier.• Three phase, three level, three switch PWM rectifier withcontrolled output voltage• Three-wire input, no connection to neutral• Ohmic mains behavior• Boost system (continuous input current).• Unidirectional power flow only !• High power density
  • copyright 2011 controltrix corp www. controltrix.comVienna Bridge Rectifier..• Low conducted common-mode EMI emissions• Low switching losses• Higher diode conduction losses• Reliable behavior (guaranteeing ohmic mains behavior) underheavily unbalanced mains voltages and in case of mains failure.• Need 2 DC , 3 ac voltage feedback and 2 ac current feedback• Telecom application (where space is at a premium)
  • copyright 2011 controltrix corp www. controltrix.comHow we can contribute• Proprietary algorithms for MIPS optimized implementation• Simulation and analysis• Implementation on MCHV board or other custom hardware• Performance Testing (test case generation and result analysis)• Hardware design consulting• Research and development• Guaranteed Best possible performance and support• Competitive prices• Proto development using 3rd party EMS/EDS
  • copyright 2011 controltrix corp www. controltrix.comDesired Specs• Input 380 V +/-20 V , 50 /60 Hz• Unbalance can be upto 10 percent• Output 600 V +/- 10 %likely outcome( @400 ~ 660V, @360 V ~ 600V )• THD < 5 %• PF > 0.99• Switching frequency ~20 Khz• Power ~ 1-12 KW• Telecom application
  • copyright 2011 controltrix corp www. controltrix.comTBD• Currents are required to be balanced ?(or track unbalanced voltages)?• (usually currents are to be balanced)• Bidirectional required or unidirectional requirement?• Space and power density constraints• DC side neutral point balancing
  • copyright 2011 controltrix corp www. controltrix.comThank Youwww.controltrix.com