Drive harmonics

A six-pulse drive's line current and its 6k ± 1 spectrum. Add a reactor, go 12-pulse or fit an active front end, and check IEEE 519.

Try it: harmonics at the point of common coupling

Supply stiffness I_sc / I_L30

Short-circuit current at the point of common coupling over the maximum demand current. A weak supply is below 20.

Drives' share of the plant load60 %

Linear loads (heaters, DOL motors) add fundamental current and dilute the distortion.

Over the IEEE 519 limit: this plant needs more mitigation on this supply.

h = 6k ± 1 ; THD = √(Σ I_h²) / I_1 ; TDD ≈ THD × (drive share of the load)