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Harmonics prediction on an installation with variable speed drives.

Gareth Whitty

I have been asked by a client to provide a harmonics prediction report on an installation with variable speed drives. I have never done one or been required to look into this before. Could someone assist me with the sort of information i would need.

We are installing around 15 Variable speed drives that will control numerous pumps and agitators around the process plant.  It is a brand new facility, so at the moment I don't know the nature of the supply to the facility although i will be able to find this out soon.

The variable speed drives will range from 0.37kW and 5.5kW, 3 Phase so nothing big.

I basically need to know what sort of information I would need to obtain from the client and the VSD manufacturer, and then how I would compile that information into a report.

I assume i will need to provide a report on each drive rather than an overall report for the installation.

Any help will be greatly appreciated.

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    It may be worthy also to get familiar with relevant standards that address the level of expected harmonics on drives. The North American IEEE-519 is one of them. The Point of Common Coupling (PCC) is an important concept to understand on this standard.

    Drives vendors or specific specialised engineering companies may also be able to provide some sort of basic level harmonic estimation tools based on the information available from the client power distribution load diagram. Expected Total Harmonic Distortion at the PCC can then be estimated this way. 

    It is well known that conventional mature Direct Front End 6 pulse drives generate the more significant level harmonics. Other More sophisticated Active Front End drives offer much lower level of harmonics. There are other harmonic mitigation approaches as well.

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    It may be worthy also to get familiar with relevant standards that address the level of expected harmonics on drives. The North American IEEE-519 is one of them. The Point of Common Coupling (PCC) is an important concept to understand on this standard.

    Drives vendors or specific specialised engineering companies may also be able to provide some sort of basic level harmonic estimation tools based on the information available from the client power distribution load diagram. Expected Total Harmonic Distortion at the PCC can then be estimated this way. 

    It is well known that conventional mature Direct Front End 6 pulse drives generate the more significant level harmonics. Other More sophisticated Active Front End drives offer much lower level of harmonics. There are other harmonic mitigation approaches as well.

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