Harmonics and VFDs in Electrical Systems

  • Overview
Harmonics: tame the wave

Tame the wave

Problem with harmonics? Danfoss has the solution

It is important to understand harmonics in order to select the proper solution to mitigate.  Harmonics can have detrimental effects on system performance including:

  • Distorted current flows through transmission devices. 
  • Extra heating of power transformers and cables that supply current to the nonlinear load.
  • Decreased capacity in local generators
  • Nuisance tripping of protection relays and circuit breakers. 
  • Increased utility costs 
  • Voltage distortion 


View the presentation below to understand harmonics, then choose between several Danfoss solutions which can optimize your system performance to meet the guidelines set forth in IEEE 519-2014.

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    Traditional Bypass Panel

    Danfoss Standard 2- or 3-Contactor Bypass Panels are known for their product quality and premium design standards. With this quality comes a wide array of choices among our standard base products. Multiple enclosure ratings, bypass control styles, and physical arrangements insure you can have your Danfoss drive panel your way.

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    Vertical Bypass Panel Assemblies

    Same VLT® power with a smaller footprint

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    VLT® PHD-102 Preferred Harmonic Design

    The VLT® PHD-102 Preferred Harmonic Design (PHD) is a full-featured, HVAC dedicated drive solution when conformance to IEEE-519 is required, even at the drive terminals. 

  • if (isSmallPicture) { VLT® PHD-202 Preferred Harmonic Design } else if (isBigColumns) { VLT® PHD-202 Preferred Harmonic Design } else { VLT® PHD-202 Preferred Harmonic Design }
    VLT® PHD-202 Preferred Harmonic Design

    The VLT® PHD-202 Preferred Harmonic Design (PHD) is a full-featured, AQUA dedicated drive solution when conformance to IEEE-519 is required, even at the drive terminals. The PHD-202 has a number of features developed specifically to meet the diverse needs of water and wastewater applications and is the most practical solution to address growing harmonic concerns within the industry.

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    VLT® Low Harmonic Drive

    The VLT® LHD is the first solution to combine an active filter and a drive in one package. It continuously regulates harmonic suppression according to the load and grid conditions without affecting the connected motor. The total harmonic current distortion is reduced to less then 3% on grids with balanced mains, a minimum pre-distortion to less than 5% on grids with high harmonic distortion and 2% phase unbalance. The VLT® Low Harmonic Drive meets all present harmonic standards and recommendations.