Jump to content


Photo

Active Front End


  • Please log in to reply
2 replies to this topic

#1 rahuljadhav1

rahuljadhav1

    Intermediate Member

  • Full Member
  • PipPipPip
  • 21 posts
  • Gender:Male
  • Location:Noida

Posted 18 October 2007 - 07:19 AM

Hi dear all,

What is active front end concept?

Regards

Rahul

#2 marke

marke

    Posting Freak

  • Moderator
  • PipPipPipPipPipPip
  • 2,604 posts
  • Gender:Male
  • Location:Christchurch, New Zealand

Posted 18 October 2007 - 08:53 AM

Hello rahuljadhav1

An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus. The IGBT bridge is supplied via a three phase reactor and the IGBTs are controlled with a PWM waveform such that a sinusoidal current is drawn from the supply. When the drive is regenerating, the DC bus voltage rises and the "active front end" acts as an inverter to convert the DC into AC and drive it back into the supply.
Some manufacturers can convert a standard drive output stage into an active input stage by changing the software. In some drives, such as the Control Techniques SP drives, the conversion simply requires the setting of one parameter.

Best regards,

#3 rahuljadhav1

rahuljadhav1

    Intermediate Member

  • Full Member
  • PipPipPip
  • 21 posts
  • Gender:Male
  • Location:Noida

Posted 23 October 2007 - 04:14 AM

QUOTE(marke @ Oct 18 2007, 02:23 PM) <{POST_SNAPBACK}>
Hello rahuljadhav1

An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus. The IGBT bridge is supplied via a three phase reactor and the IGBTs are controlled with a PWM waveform such that a sinusoidal current is drawn from the supply. When the drive is regenerating, the DC bus voltage rises and the "active front end" acts as an inverter to convert the DC into AC and drive it back into the supply.
Some manufacturers can convert a standard drive output stage into an active input stage by changing the software. In some drives, such as the Control Techniques SP drives, the conversion simply requires the setting of one parameter.

Best regards,



thank you sir.

take care

regards

Rahul




0 user(s) are reading this topic

0 members, 0 guests, 0 anonymous users