Aktive Oberwellenfilter verstehen: Funktionsprinzipien, Vorteile und Anwendungen

In der Welt der Elektrotechnik, maintaining ​power quality ​is paramount. One ​of the ​challenges we often ​face is ​harmonics, those pesky ​distortions in ​the electrical waveform ​that can ​wreak havoc on ​our systems.

​To combat this ​issue, engineers ​have developed various ​methods and ​technologies, and one ​of the ​most advanced solutions ​is the ​Active Harmonic Filter.

​In this ​blog post, we’ll ​dive into ​the fascinating world ​of active ​harmonic filters, exploring ​their working ​principles, advantages, applications, ​and how ​they differ from ​passive harmonic ​filters.

Was ist ein aktiver Oberwellenfilter?

Bevor wir uns mit den Feinheiten befassen, sollten wir definieren, was ein aktiver Oberwellenfilter ist. Einfach ausgedrückt ist ein aktiver Oberschwingungsfilter ein Gerät zur Abschwächung von harmonische Verzerrungen in ​an electrical ​system.

These distortions, ​caused by ​nonlinear loads such ​as variable ​frequency drives, computers, ​and LED ​lighting, can lead ​to voltage ​fluctuations, increased losses, ​and overheating ​of equipment.

Active ​harmonic filters ​are the superheroes ​of the ​power quality world, ​swooping in ​to save the ​day by ​detecting and neutralising ​these harmonics ​in real time.

Aktiver Oberwellenfilter Arbeitsprinzip

Aktive Oberschwingungsfilter werden von einem geschlossenen Echtzeitsystem gesteuert, das das Stromnetz ständig im Auge behält. Auf diese Weise entfalten sie ihre Wirkung:

1. ​Current and Voltage ​Measurement: The ​active harmonic filter ​first measures ​the current and ​voltage at ​the point of ​connection to ​the grid. This ​data is ​critical for determining ​the harmonic ​content and power ​factor of ​the load.

2. ​Harmonic Detection: ​The filter analyses ​the data ​to identify the ​specific harmonic ​frequencies present in ​the system. ​This is crucial ​because different ​harmonics require different ​corrective actions.

​3. Generation of ​Counteractive Harmonics: ​Once the harmonics ​are identified, ​the active harmonic ​filter generates ​counteractive harmonic currents, ​precisely out ​of phase with ​the offending ​harmonics. These counteractive ​currents effectively ​cancel out the ​unwanted distortions, ​restoring the waveform ​to its ​ideal sinusoidal shape.

​4. Real-Time ​Correction: This process ​is continuous, ​adjusting to changing ​loads and ​harmonics in real time. ​The active ​harmonic filter acts ​as a ​smart guardian, adapting ​to the ​evolving needs of ​the electrical ​system.

5. Improved ​Power Factor: ​Apart from harmonics, ​active harmonic ​filters also help ​in improving ​the power factor, ​ensuring efficient ​use of electrical ​energy and ​reducing penalties imposed ​by utilities ​for low power ​factor.

Aktive Oberwellenfilter Vorteile

Aktive Oberschwingungsfilter bieten eine Fülle von Vorteilen, die sie in vielen Anwendungen zur bevorzugten Wahl machen:

1. Precise ​Harmonic Mitigation: ​Being based on ​a closed-loop ​control mechanism, active ​harmonic filters ​are extremely precise ​in removing ​harmonics. This precision ​ensures that ​the power quality ​remains consistently ​high.

2. Real-Time ​Correction: Active ​harmonic filters are ​more effective ​and efficient than ​passive filters ​because they can ​rapidly adjust ​to changes in ​the electrical ​network.

3. Improved ​Power Factor: ​These filters help ​improve power ​factor, which reduces ​the strain ​on the power ​distribution system, ​leading to energy ​savings and ​lower utility bills.

​4. Reduced ​Equipment Stress: By ​eliminating harmonics ​and voltage distortions, ​active harmonic ​filters extend the ​lifespan of ​sensitive equipment, reducing ​maintenance costs.

​5. Cost Savings: ​Although active ​harmonic filters come ​with a ​higher initial cost, ​the long-term ​benefits, including reduced ​downtime, energy ​savings, and equipment ​longevity, make ​them a cost-effective ​solution.

6. ​Compliance: They help ​facilities comply ​with international power ​quality standards ​and regulations, ensuring ​a consistent ​and reliable power ​supply.

Aktive Oberwellenfilter

Anwendung von aktiven Oberwellenfiltern

Aktive Oberschwingungsfilter finden in verschiedenen Branchen, in denen die Netzqualität von entscheidender Bedeutung ist, eine breite Palette von Anwendungen. Einige gängige Anwendungen sind

1. Industrial ​Facilities: Manufacturing ​plants, especially those ​with variable ​speed drives and ​other nonlinear ​loads, benefit significantly ​from active ​harmonic filters. They ​ensure the ​reliability of machinery, ​reduce maintenance ​costs, and improve ​overall system ​efficiency.

2. Data ​Centres: Data ​centres rely on ​an uninterrupted ​power supply. Active ​harmonic filters ​play a crucial ​role in ​maintaining power quality, ​reducing the ​risk of data ​loss, and ​ensuring the longevity ​of IT ​equipment.

3. Commercial ​Buildings: In ​office complexes, retail ​spaces, and ​hospitals, active harmonic ​filters help ​maintain a stable ​power supply, ​ensuring that HVAC ​systems, elevators, ​and sensitive medical ​equipment operate ​smoothly.

4. Renewable ​Energy Installations: ​Wind and solar ​farms can ​generate harmonics due ​to the ​variability of their ​power output. ​Active harmonic filters ​are used ​to ensure the ​clean injection ​of power into ​the grid, ​preventing disturbances and ​ensuring grid ​stability.

5. Wastewater ​Treatment Plants: ​In these facilities, ​pumps, blowers, ​and various process ​equipment introduce ​harmonics. Active harmonic ​filters help ​in maintaining efficient ​operation and ​reducing energy consumption.

What is the Difference​ Between Active and Passive Harmonic Filters?

Unterschied zwischen aktiven und passiven Oberwellenfiltern

Um die Rolle aktiver Oberschwingungsfilter richtig einschätzen zu können, ist es wichtig zu verstehen, wie sie sich von passiven Oberschwingungsfiltern unterscheiden:

1. ​Real-time vs. Static: ​Active filters ​continuously monitor and ​adapt to ​the electrical system’s ​changing needs ​in real-time, whereas ​passive filters, ​such as shunt ​capacitors or ​inductors, provide a ​fixed level ​of correction.

2. ​Flexibility: Able ​to reduce a ​broad spectrum ​of harmonic frequencies, ​active filters ​are incredibly adaptable. ​On the ​other hand, passive ​filters might ​not work in ​every circumstance ​because they are ​intended for ​particular harmonic frequencies.

​3. Dimensions ​and Weight: In ​comparison to ​their passive counterparts, ​active filters ​are typically smaller ​and lighter. ​They are therefore ​more useful ​in scenarios when ​there is ​a shortage of ​space.

4. ​Initial Cost vs. ​Long-Term Benefits: ​In general, active ​harmonic filters ​are more expensive ​initially than ​passive filters. But ​in many ​cases, the long-term ​advantages—such as ​energy savings and ​equipment protection—outweigh ​the upfront costs.

​5. Maintenance: ​While active filters ​require regular ​inspections and upgrades ​to guarantee ​optimal operation, passive ​filters do ​not require continuous ​maintenance.

6. ​Overload Handling: Active ​filters can ​handle temporary overloads ​better due ​to their real-time ​control, making ​them more robust ​in dynamic ​electrical environments.


When ​it comes to ​power quality, ​active harmonic filters ​are revolutionary. ​Their adaptable, real-time ​method of ​reducing harmonics and ​raising power ​factors makes them ​an essential ​tool for a ​variety of ​sectors.

The long-term ​advantages, such ​as less downtime, ​energy savings, ​and longer equipment ​life, make ​them a wise ​investment even ​though they could ​have a ​greater initial cost.

​Active harmonic ​filters work as ​dependable protectors ​in a world ​where electrical ​systems are growing ​more intricate, ​guaranteeing that the ​power we ​depend on is ​clean, steady, ​and effective.

With ​their applications ​spanning from industrial ​facilities to ​data centres and ​renewable energy ​installations, the importance ​of active ​harmonic filters in ​our modern ​world cannot be ​overstated.

As ​we continue to ​demand more ​from our electrical ​systems, these ​devices will play ​an even ​more significant role ​in shaping ​the future of ​power quality ​and energy efficiency.


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