Active Harmonic Filter

Active harmonic filters from YADA Electronics — a Guangdong-based manufacturer (Beijing Stock Exchange: 920556) building modular AHF, APF and SVG units for harmonic mitigation, power-factor correction and reactive-power compensation in industrial and commercial power systems. This category holds 5 active harmonic filter models covering module ratings from 5 A to 200 A on 220 V to 690 V three-phase networks, filtering the 2nd to 61st harmonic orders.

AHF, APF And SVG — What The Three Names Actually Mean

Buyers frequently receive quotations for “AHF”, “APF” and “SVG” and assume they are three different products. In YADA’s range they describe what the unit is configured to correct, not three unrelated technologies. All three use the same modular power-electronics platform.

Where a site has both a power-factor penalty and a distortion problem, a single modular unit can be configured to address both — this is the usual reason to choose an active filter over a passive filter or a capacitor bank.

Active Harmonic Filter Technical Specifications

The table below consolidates the published specifications across the models in this category. Individual models cover subsets of these ranges; the engineering team confirms the exact figures for a given model at quotation.

Why Modular Construction Matters For The Purchase Decision

A fixed-capacity filter has to be sized for the plant’s future worst case, which means paying up front for capacity that stays idle for years. Modular units are rated per module — a 200 A requirement can be met by paralleling smaller modules, and capacity can be extended later by adding modules rather than replacing the installation.

Modularity also affects availability. When one module in a parallel group is taken out of service, the remaining modules continue to compensate at reduced capacity instead of the compensation dropping to zero. For continuous-process sites this is usually the deciding factor.

Typical Applications

• Data centres — UPS rectifier fronts are a dominant harmonic source; YADA’s monitoring and metering products are already deployed in this sector.
• EV charging stations — banks of DC fast chargers create both distortion and reactive-power demand.
• Solar and new-energy installations — inverter-dense sites where grid-code compliance must be demonstrated.
• Manufacturing plants — variable-frequency drives, induction furnaces, welding plant and DC drives.
• Telecommunications facilities — switch-mode rectifier loads running continuously.
• Commercial buildings — LED lighting, lifts and HVAC drives raising neutral-conductor current in 3P4W distribution.

How To Select An Active Harmonic Filter

1. Measure before sizing. Record the harmonic spectrum and THDi at the point of common coupling under real load. Sizing from nameplate ratings alone routinely produces an oversized or undersized unit.
2. Decide what has to be corrected. Harmonic distortion, power factor, or both — this determines the AHF / SVG configuration.
3. Confirm the distribution system. Voltage, frequency, and 3P3W versus 3P4W. Four-wire systems with significant triplen harmonics need neutral-current compensation.
4. Establish the compensation current. Total the harmonic current to be cancelled, then select the module rating and module count with headroom for load growth.
5. Fix the physical constraints. Wall-mount or rack-mount, available cabinet space, ambient conditions against the IP54 rating.
6. Specify the monitoring interface. 7-inch HMI, LED or WiFi, and whether the data has to reach an existing power-monitoring system.

Frequently Asked Questions

Can an active harmonic filter replace a capacitor bank?

An SVG-configured unit performs reactive-power compensation without the resonance risk that capacitor banks carry in distorted networks. Where a capacitor bank is already failing or resonating with existing harmonics, replacement with an active unit removes the resonance path.

Which harmonic orders are actually filtered?

The published range is the 2nd to 61st order, with selected models specified as 0–50th order. The 5th, 7th, 11th and 13th orders that dominate six-pulse rectifier loads fall well inside both ranges.

Does one unit handle both 3P3W and 3P4W systems?

Yes — the published specification states 3P3W/3P4W support in the same unit, so the wiring configuration does not require a different hardware version.

How is capacity increased after installation?

By adding modules. The modular design is intended for capacity expansion without replacing the units already installed.

Are OEM and ODM builds available?

Yes. Current rating, enclosure format, monitoring interface and private labelling can all be specified. Commercial terms including minimum quantities and lead times are confirmed with the quotation.

Related Product Categories

• Power Quality Analyzers — measure the harmonic spectrum and THDi before sizing a filter.
• Power Meters — verify power factor and distortion after commissioning.
• Current Transformers — the sensing elements feeding the filter’s control loop and the metering circuit.
• AC Energy Meters — energy accounting on the corrected circuit.
• Surge Protection Devices — transient protection for the same distribution board.