Chart

VFD harmonic mitigation option matrix

Compare line reactors, DC chokes, multi-pulse drives, passive filters, active filters, and active front ends for VFD harmonic planning.

Chart boundary

Does not calculate harmonic distortion, prove utility compliance, select a filter, or replace a power-quality study.

mitigation matrix

Mitigation option tradeoff matrix

Use the matrix to move from symptom and drive count toward the right study or manufacturer conversation.

Scopemotors and vfdsX-axiscost and complexityY-axisharmonic reduction / study triggerReviewAnnualNext575/600 V VFD planning current calculator
Mitigation option tradeoff matrixcost and complexityharmonic reduction / study triggerLow complexity / baseline6-pulse driveHighest THDi band; may need impedance o...Low-medium complexityline reactor / DC chokeRetrofit-friendly with limited harmonic...Medium-high complexitypassive / active filterTargeted reduction that needs system an...High complexityAFE / multi-pulseUseful for tight targets, regeneration,...
Use the matrix to move from symptom and drive count toward the right study or manufacturer conversation.
cost and complexity
harmonic reduction / study trigger
Low complexity / baseline6-pulse drive

Highest THDi band; may need impedance or filtering.

Low-medium complexityline reactor / DC choke

Retrofit-friendly with limited harmonic reduction.

Medium-high complexitypassive / active filter

Targeted reduction that needs system and load-profile review.

High complexityAFE / multi-pulse

Useful for tight targets, regeneration, or larger drive lineups.

left: lower cost/complexityright: higher cost/complexitytop: stronger reduction or study trigger

Decision reference

Show mitigation option tradeoffs before a power-quality study or drive specification.

Reference basis: NRCan VFD context, Canadian utility power-quality definitions, and harmonic mitigation technical references.
MethodBest fitWatch pointHandoff
Line reactorBasic input impedance and transient helpLimited harmonic reductionDrive manufacturer data
DC chokeIntegrated drive impedance optionDrive-specific availabilityVFD product data
Passive filterKnown harmonic target at defined loadResonance and tuningPower-quality study
Active filter / AFETighter harmonic or regenerative needsCost, controls, and system studyUtility/study review

Use notes

  • Use this chart as a planning and conversation aid only.
  • Confirm current utility requirements, product markings, manufacturer instructions, and local authority requirements before field work.
  • Use the linked calculator or table when the task needs project-specific arithmetic.

Reference sources

Open the underlying public references before treating the chart as project guidance.