Power Quality · 6 min read · Published 2026-07-17 · Updated 2026-07-17
Active filters dynamically inject compensating current, while passive filters are tuned circuits. Variable industrial loads often benefit from active harmonic filtering.
Passive harmonic filters
Passive filters are tuned for specific harmonic orders and can be cost-effective when the load profile is stable. However, they require careful design to avoid resonance and may not adapt well to changing loads.
Active harmonic filters
Active harmonic filters monitor load current and dynamically compensate harmonic distortion. They are useful where VFDs, UPS systems and power electronic loads vary during production.
