Hi dear all,
What is active front end concept?
Regards
Rahul
Active Front End
Started by rahuljadhav1, Oct 18 2007 07:19 AM
2 replies to this topic
#1
rahuljadhav1
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Posted 18 October 2007 - 07:19 AM
#2
marke
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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An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus.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,
An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus.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,
Mark Empson | administrator
Skype Contact = markempson | phone +64 274 363 067
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#3
rahuljadhav1
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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An active front end for a drive is where the rectifier has been replaced by an IGBT bridge (rather than a rectifier bridge) and the IGBTs are used to rectify the the AC supply to create the DC bus.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,
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
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