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Why do some inverters (VFDs) needs a reactor at the input or DC choke in the DC bus?
In order to smooth the current a choke can be placed upstream the inverter 2 locations possible:
  • In the DC bus
  • Onto the main supply

Effect of the choke
  • The efficiency of the choke on harmonics is depending on its impedance
  • Higher the impedance, lower the harmonic distortion
  • But higher the impedance, higher the drop voltage

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