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Active Harmonic Filter imageActive Harmonic Filters

Product Highlights

Dramatically improves power quality

Reduces over loading of cable, motors and transformers

Injects equal and opposite Harmonic currents from 3rd – 31st

Enables compliance with G5/4

25 – 200A ratings 3 and 4 wire

Voltage ratings 208 – 480 – 50/60Hz

Straightforward installation as retro-fit with minimal down time

Reduces THD to less than 5% to meet stringent IEEE 519 and G5/4 Standards

Most types available on approx 4 week delivery

Active Harmonic Filter digital control panel imageHarmonic Problems

With the increased presence of electronics on power distribution systems, disruptive anomalies are created, and harmonics can become a problem. Some equipment that can be large contributors to harmonics are:

Fluorescent lamps

Computers and peripherals

Welding machines

Uninterruptible power supplies (UPS)

AC/DC variable speed drives

Frequency converters

DC Power Systems/Chargers

BPC has taken traditional “passive” harmonic filtering equipment to a new level – an active based harmonic filter technology.

PDF logo Download the Active Harmonic Filter PDF leaflet

Product Highlights

Active harmonic filters use power electronics to monitor the nonlinear load and dynamically correct every harmonic order from the 3rd to 31st. Additionally, this product has been performance tested to the 51st harmonic order, and will operate in a resonance condition, maintaining consistent, maximum performance. By injecting a compen- sating current into the load, the sine wave is restored, and distortion is dramatically reduced to less than 5% THD, to meet stringent IEEE 519 Standards.

The high speed process cancels high frequency output current, while it ultimately determines the precise value of injected load current. BPCs power electronics platform has been designed to operate at levels that continuously adapt to rapid load fluctuations. With its efficient operation and small physical size, it is ideal for a wide variety of industrial and commercial environments.

Why this Harmonic Filter is a Better Choice

With other harmonic mitigation solutions, expensive and time-consuming site data collection, power quality surveys and computer generated studies are usually needed. Most harmonic filters are designed to accommodate just one or a few harmonic orders. The Active Harmonic Filter corrects a full range of harmonic order, and will not create a resonance condition with other existing equipment, so only minimal up-front analysis is required. This product can be easily and conveniently added in parallel with other active filters, to accommodate future facility expansions or equipment additions. Virtually no time is lost for installation, supporting the import-ant uptime operation of your facility.

The rating (size) of this Active Harmonic Filter is based on nonlinear load requirements (corrective current), not both linear and nonlinear, like traditional filter equipment. That means that you can install this product at a reduced ampere rating, which will lower initial capital costs.

Inherent in this Active Harmonic Filter is the ability to correct a proportional amount of corrected power factor/ reactive compensation. For applications where high levels of power factor correction are also necessary, Boddingtons Power Controls can provide a “hybrid” system, which integrates active filters with our traditional power factor correction modules, providing the highest level of system efficiency.

A door mounted LCD graphic multifunctional display with 8 function keypad means easy operation and maintenance programming of the active filter, along with waveform data, spectrum date (up to the 31st order), system management and networking capability. The controller allows for global (all harmonic orders) or selectable (specific harmonic orders) or selectable (specific harmonic orders) and settable bar correction for maximum flexibility.

BPC products are available as stand alone systems, or they can be integrated with other power quality and power distribution equipment, including motor control centres. Application engineered designs and higher ampere ratings can be easily accommodated. Where the neutral connection presents a harmonic concern, a 4 wire product be used, eliminating the need for another installed device.

Harmonic mitigation increases electrical capacity and stabilizes the electrical system, while power factor correction increases power efficiency and reduces electric utility costs.

Active Filtering and Power Generation

Installing an active harmonic filter can benefit on-site power, emergency power, and distributed generation/ energy. Technologies such as reciprocating (diesel and natural gas) engine-generators, microturbines, fuel cells, solar/photovoltaics, and wind turbines can have improved system performance and reliability, especially during start up and load transfers. In addition, BPC Active Harmonic Filters will alleviate problematic, disruptive and potentially damaging harmonics from the total load or distribution system. This product performs the same, regardless of impedance, and regardless of using the AC line, on-site power, or even the output of a UPS or flywheel. When power factor correction capacitors are incorporated, size requirements may be reduced, saving up front costs.

Newer technologies use power electronics for system operation and control. Though efficient in and of themselves, these devices are the primary cause of harmonics produced in an electrical system. This Active Harmonic Rilter helps assure continuous power, especially where energy and efficient power delivery is critical.

BPC products can further enhance your power quality solutions with bundled packages including voltage regulation, surge/sag, ride-through, uninterruptible power (UPS) and power factor / harmonic correction.

A Real Solution

This Active Harmonic Filter behaves like a harmonics current generator. It measures the harmonics generated from a nonlinear load and cancels the harmonics with a newly generated, opposite phase shifted harmonic current of the same amplitude (AC/DC/AC). This allows it to:

Eliminate all harmonic currents from nonlinear loads

Compensate reactive power factor of lagging loads

Act as a damping resistor to prevent harmonic resonance

Example of Active Harmonic Filtering

A large 3 phase UPS with a 6 pulse rectifier creates heavy harmonic feedback of 30 – 40% THD into Mains or an emergency generator. It can cause voltage distortion or generator malfunction. The BPC Active Harmonic Filter is designed to work with the UPS and mitigates harmonics to less than 5%.

Active Harmonic Filter Diagram

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