Editorial Technical Reference

Active Power Filter

This page explains how Active Power Filter is classified within Electrical Equipment Manufacturing. Technical values and manufacturer relationships are research references; confirm the current specification and supplier evidence for each order.

Technical Definition & Core Assembly

An active power filter (APF) is a power electronic device that dynamically compensates harmonics, reactive power, and load imbalances in electrical distribution systems.

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Product Specifications

Technical details and manufacturing context for Active Power Filter

Definition
Active power filters are used in industrial, commercial, and utility power systems to improve power quality by mitigating harmonic distortion caused by non-linear loads such as variable frequency drives, UPS systems, and welding equipment. They are specified by rated voltage, compensation capacity, harmonic order range, and response time. Grades differ in switching frequency, control algorithm sophistication, cooling method, and reliability components (e.g., IGBT modules, capacitors).

Typical low-voltage units are rated for 380–690 V AC (IEC 60038) and per-phase compensation currents from 25 to 600 A. They can compensate harmonics from the 2nd to the 50th order (IEEE 519), provide continuously adjustable reactive power compensation from 0 to 100%, and achieve a total harmonic distortion (THD) of less than 5% after compensation. Dynamic response is under 100 microseconds, with switching frequencies between 10 and 20 kHz. Efficiency exceeds 97% at full load, and units can handle 120% overload for one minute. Operating temperature range is -10 to +50 °C with derating above 40 °C, and cooling is forced air with temperature control. Enclosure protection ratings range from IP54 to IP65 (IEC 60529). Communication interfaces include RS485 and Modbus (IEC 61158).

Key components include IGBT modules (e.g., Infineon FF400R07A01E3), electrolytic capacitors (e.g., EPCOS B43508), a DSP controller (e.g., TI TMS320F28335), current transformers (e.g., 1000:1 accuracy class 0.5), an aluminum heat sink with forced air cooling, and a galvanized steel enclosure (IP54).

Relevant standards include IEC 61000-3-4, IEC 61000-3-12, IEEE 519-2014, GB/T 14549-1993, and EN 50178. Always verify model-specific values and standards with the legal manufacturer or supplier before procurement.
Working Principle
The APF continuously monitors the load current using current transformers, extracts the harmonic and reactive components via digital signal processing (DSP), and generates an equal and opposite compensation current using a PWM-controlled inverter. This injected current cancels the unwanted components at the point of common coupling, resulting in a near-sinusoidal supply current.
Common Materials
IGBT modules (e.g., Infineon FF400R07A01E3), Electrolytic capacitors (e.g., EPCOS B43508), DSP controller (e.g., TI TMS320F28335), Current transformers (e.g., 1000:1 accuracy class 0.5), Aluminum heat sink with forced air cooling, Galvanized steel enclosure (IP54)
Technical Parameters
ParameterTypical rangeNotes & selection driver
Rated Voltage380–690 V ACCommon low-voltage distribution levelsIEC 60038
Rated Compensation Current25–600 APer phase; determines capacity
Harmonic Compensation Range2–50 orderSelectable harmonic ordersIEEE 519
Reactive Power Compensation0–100 %Continuously adjustable leading/lagging
Total Harmonic Distortion (THD) after compensation<5 %At rated loadIEEE 519
Response Time<100 μsTypical dynamic response
Switching Frequency10–20 kHzHigher frequency reduces size but increases losses
Efficiency>97 %At full load
Overload Capacity120 %For 1 minute
Operating Temperature Range-10 to +50 °CDerating above 40°CIEC 60721-3-3
Cooling MethodForced airFan cooling with temperature control
Enclosure Protection RatingIP54–IP65Indoor/outdoor optionsIEC 60529
Communication InterfaceRS485, ModbusFor remote monitoringIEC 61158
Standards ComplianceIEC 61000-3-4, IEEE 519Harmonic emission limits

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM
  • Current Transformers
    Sense the load current the harmonic extraction works from.
  • DSP
    Extracts the harmonic and reactive components from the measured current.
  • Inverter
    PWM-controlled stage that injects the compensating current.
Technical documentation
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Manufacturing capability
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Inspection readiness
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Manufacturers of Active Power Filter

7 companies list this product among what they make. Company figures are quoted from each company's own website; every card states where the relationship came from.

Acrel Co., Ltd.
Shanghai, CN
CE IEC VDE
Also makes: Remote Terminal Unit, Current Transformer, Power Distribution and 5 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Active Power Filter”
View source page ↗ acrel-electric.com · checked 2026-08-22
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Shenzhen Sinexcel Electric Co., Ltd.
Shenzhen, Guangdong, CN
Founded 2003
CE UL DNV RINA +2
Also makes: Energy Storage Converter (PCS), EV Charging Pile, Grid Filter (LCL/LC Filter) and 1 more
Stated by the company · profile compiled by CNFX from public sources
View profile Send enquiry
CNBYG
Zhejiang, CN
Also makes: Intelligent Controller, Circuit Breaker, Film Capacitor and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “BY91 Series Active Power Filter (APF)”
View source page ↗ cnbyg.com · checked 2026-09-15
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Leonhard (Shanghai) Electricity Co., Ltd.
Shanghai, CN
Also makes: Human-Machine Interface, Relay Module, Grid Filter (LCL/LC Filter)
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Hybrid Active Power Filter”
View source page ↗ ldelect.com · checked 2026-09-13
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Sineng Electric
Wuxi, Jiangsu, CN
Also makes: Digital Power Controller, Battery System, Power Management Controller and 2 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Active Power Filter (APF)”
View source page ↗ en.si-neng.com · checked 2026-09-18
View profile Send enquiry
Strong Power Electric Co.,Ltd.
Xinxiang, Henan, CN
Also makes: Grid Filter (LCL/LC Filter), Power Analyzer, Energy Storage/Transfer Element (for active systems) and 1 more
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “active power filter”
View source page ↗ strongpowerelectric.com · checked 2026-09-06
View profile Send enquiry
Wuxi Cre New Energy Technology Co., Ltd.
Wuxi, Jiangsu, CN
Also makes: Power Inverter, Film Capacitor
Listed on the company's own website · profile compiled by CNFX from public sources
Listed there as: “Active Power Filter capacitor”
View source page ↗ cre-elec.com · checked 2026-09-14
View profile Send enquiry

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Frequently Asked Questions

What are the typical voltage and current ratings for an active power filter?

Typical low-voltage units are rated for 380–690 V AC (IEC 60038) and per-phase compensation currents from 25 to 600 A. These are reference ranges; the actual model must be confirmed with the manufacturer.

Which harmonic orders can an active power filter compensate?

The harmonic compensation range is from the 2nd to the 50th order, as per IEEE 519. This allows addressing a wide range of non-linear loads.

What is the typical response time of an active power filter?

The dynamic response is typically under 100 microseconds, enabling fast correction of load variations. This value is a reference and should be verified for the specific model.

What standards apply to active power filters?

Relevant standards include IEC 61000-3-4, IEC 61000-3-12, IEEE 519-2014, GB/T 14549-1993, and EN 50178. Compliance should be verified with the manufacturer for the specific model.

Data basis: editorial classification, named public sources where available, and source-reviewed manufacturer records. See the editorial policy.

Industry Taxonomies & Aliases

Commonly used trade names and technical identifiers for Active Power Filter.

Active power filters and SVG SVG

Data Basis

Editorial classification, named public sources where available, and source-reviewed manufacturer records.

Preliminary Technical Classification
This page supports structured research, RFQ preparation, and supplier evaluation. It does not replace buyer-led supplier qualification, standards review, or technical approval.

Compiled and source-reviewed by the CNFX editorial team. Each manufacturer above links to the page on that company's own website where the product is listed, with the date we checked it. How we source and review · Page last updated 1 October 2026

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