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Active Harmonic Filter (AHF)

An active power filter (APF) is a new type of power electronic device used for dynamic harmonic suppression. It can suppress harmonics that vary in both magnitude and frequency. As the name suggests, an active filter requires a power supply. Its application overcomes the shortcomings of traditional harmonic suppression methods such as LC filters, achieving dynamic tracking.

Your Professional Active Harmonic Filter (AHF) Supplier！

Leonhard (Shanghai) Electricity Co., Ltd. (LEONHARD) established in 2017, is a high-tech enterprise in the field of power quality, specializing in modern, professional, and intelligent high-quality products and services.As a pioneer and leader in power quality solutions, LEONHARD specializes in R&D, production, and sale of Active Harmonic Filter, Static Var Generator, Hybrid Var Compensator System,Dynamic Voltage Restorer,VFD DC Link System,Unified Power Quality Conditioner.

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why choose us

Professional Team

Leonhard is the first company in China to apply SiC MOSFET to the power quality industry. It has advanced manufacturing equipment and a professional R&D team. Through continuous improvement and R&D, its SiC series products have now reached the third generation.

Our Certifications

Our products are backed by CE certification, patents, and third-party testing reports. With successful projects across multiple international markets, we understand global standards and application requirements.

Sales Market

Our power quality products have been widely used in Poland, Mexico, Belarus, Cambodia, Thailand, Vietnam, Dortmund and other countries.

Our Service

We provide end-to-end service from pre-sales system design to installation, commissioning, and after-sales support. With 24/7 technical assistance and regular maintenance services, we help ensure stable system operation over time.

Product Specification

We offers the following product specifications：

Parameter	Specification
Frequency	50/60 Hz
Efficiency	>97%
Response Time	<10 ms
Harmonic Elimination Rate	>95%
Wiring Types	3P3W / 3P4W (Compatible)
Communication Interface	RS485, Modbus Protocol
Installation Types	Rack-mount, Wall-mounted, Floor-standing Cabinet

Product advantages

Dynamic Harmonic Mitigation:

Unlike passive filters, AHFs automatically adapt to changing loads, eliminating multiple harmonic orders (up to 51st or higher) simultaneously.

Real-time Response:

With a response time typically less than 5 ms, they immediately compensate for fluctuating power quality issues.

Multi-Function Compensation:

Beyond harmonic filtering, they provide active reactive power compensation (power factor correction) and load balancing across phases.

Modular and Compact Design:

They are highly scalable, allowing multiple units to operate in parallel to meet increased load demands, and often feature compact footprints for, wall or rack mounting.

No Risk of Resonance:

Because they are active devices rather than passive LC circuits, they do not create harmonic resonance with the power system.

Advanced Monitoring:

Equipped with intelligent FFT (Fast Fourier Transform) analysis and user-friendly HMIs (Human-Machine Interfaces) for comprehensive diagnostics, reporting, and communication.

Operational Reliability:

They are robustly designed for industrial environments, often featuring protection ratings up to IP55, with low maintenance requirements.

Application

Data centers:

Ensuring uninterrupted operation and protecting servers and other sensitive equipment from harmonics.

Manufacturing plants:

Maintaining the performance and reliability of electrically driven machinery, robotic systems, and automation equipment.

Commercial buildings:

Optimize the power quality of complex electrical systems and improve the performance of HVAC, lighting, and other building systems.

Healthcare Facilities:

Ensure proper operation of life support and medical imaging equipment.

Renewable Energy Systems:

Improve the power quality of solar inverters, wind turbines, and other renewable energy sources.

Electric Vehicle Charging Stations:

Maintain optimal power quality during charging and protect the vehicle's on-board electronics.

Components

Power Converter:

Converts and injects compensating currents.

Digital Signal Processor (DSP):

Analyzes system harmonics in real-time.

Sensors:

Detect voltage and current distortions.

Control System:

Coordinates the overall operation of the filter.

User Interface:

Provides real-time monitoring and configuration options.

Energy Storage Systems:

Some AHFs incorporate energy storage to enhance efficiency during peak loads.

Certifications

Other Services

All of our machines will be fully checked by our quality control department before the shipment. We guarantee all of our have a one-year warranty (quick-wear parts not included).

Training details: Operation principles, system, and structure, safety and maintenance, software processing technique, etc.

Numerous feedback from our clients have proven that our machines are stable in performance with rare malfunction.However, we would like to handle it as follows once malfunction occurs:

We guarantee that we will give you a clear reply within 24 hours.

Customer service staff will assist you in analyzing the malfunction to locate the cause.

If the malfunction is caused by improper operation of software and other soft faults, we will help solve the problem online.

We will offer plenty of online support, like detailed technical and installation instructions via email, video, and telephone.

Package & Delivery

1. Package: Standard export package or Custom

2. Delivery: By air express, by sea

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FAQ

Q: What is an AHF active harmonic filter?

A: An Active Harmonic Filter (AHF) is a power quality device that dynamically mitigates harmonic distortions in electrical systems by generating counteracting currents. It helps in reducing harmonics, improving power factor, and stabilizing voltage fluctuations.

Q: How does the AHF active harmonic filter work?

A: An AHF continuously monitors the electrical system using current sensors and detects harmonic distortions. It then generates real-time compensating currents with an inverse phase to neutralize harmonics, ensuring a clean power supply.

Q: What is the purpose of the harmonic filter in power system?

A: The primary purpose of an AHF is to improve power quality by:
-Reducing harmonic distortions
-Enhancing power factor
-Mitigating voltage fluctuations
-Reducing stress on electrical equipment, extending their lifespan

Q: What is the difference between an AHF active harmonic filter and a PHF passive harmonic filter?

A: Active Harmonic Filter (AHF): Uses real-time electronics and injects compensating currents to cancel harmonics dynamically.
Passive Harmonic Filter (PHF): Uses passive components (inductors, capacitors, resistors) tuned to specific harmonic frequencies for mitigation.

Q: Which is better, an active or passive filter?

A: AHF is better for dynamic loads, variable-frequency drives (VFDs), and systems with fluctuating harmonic levels.
PHF is more cost-effective for stable loads with predictable harmonic profiles.
The choice depends on application requirements, budget, and flexibility needs.

Q: What is the difference between an active harmonic filter and a capacitor bank?

A: AHF primarily mitigates harmonics and improves power quality.

Q: Capacitor banks are used for power factor correction but can worsen harmonics in some cases.

A: AHFs can function dynamically, whereas capacitor banks are typically fixed or switched in steps.

Q: What is the difference between an AHF active harmonic filter and SVG Static Var Generator?

A: AHF focuses on harmonic compensation and power factor correction.
SVG primarily provides reactive power compensation to maintain a stable power factor.
AHFs are better for harmonic-rich environments, while SVGs are ideal for voltage stability and reactive power control.

Q: How do you choose an active harmonic filter panel?

A: Consider the following factors:
-Harmonic spectrum analysis of the system
-Load size and variation
-Total harmonic distortion (THD) limits required
-Power factor improvement needs
-Compatibility with existing electrical infrastructure
-Budget and cost-effectiveness

Q: Are you manufacturer or trading company?

A: We are manufacturer.

Q: What's your best delivery time?

A: Within 15-30 days.

Q: Will your company provide free sample?

A: It depends on which sort of item you want to get. Some can be provided free of charge, however, the client shall assume the shipping fees himself.

Q: Is OEM open to clients?

A: Yes, we can provide both OEM and ODM service.

Q: Have you tested all your goods before shipment?

A: Yes, we will conduct 100% test before delivery, and we will send detailed photos of parts for your approval .

As one of the most professional active harmonic filter (ahf) manufacturers and suppliers in China, we're featured by quality products and good service. Please rest assured to wholesale custom made active harmonic filter (ahf) from our factory. For more information, contact us now.