Active Harmonic Filter

Key Benefits

Toshiba has for many years specialised in the design of power systems incorporating harmonic filters specifically to smooth out distorted supply voltages and currents caused by non-linear loads like Variable Speed Drives, Arc furnaces, Uninterrupted Power Supplies (UPS) and Switch Mode Power Supplies utilised in many apparatus including industrial and personal computers.

Active harmonic filters (AHFs) have several key benefits, including:
  • Power quality improvement: AHFs can effectively reduce harmonic distortion in the power supply, resulting in a cleaner, more stable power supply.
  • Energy efficiency: Harmonics can cause increased energy consumption and reduced efficiency in electrical equipment. By reducing harmonic distortion, AHFs can improve the efficiency of equipment and lower energy costs.
  • Protection of equipment: Harmonics can cause damage to electrical equipment, leading to costly repairs or replacements. By reducing harmonic distortion, AHFs can help protect equipment and prolong its lifespan.
  • Compliance with regulations: Australia and many other countries and regions have regulations that limit the level of harmonic distortion that is allowed in a power supply. AHFs can help ensure compliance with these regulations.
  • Flexibility: AHFs can be customised to meet specific requirements and can be easily integrated into existing systems.

Advantages

  • Distorted current waveforms are smoothened out
  • Associated voltage waveforms become almost sinusoidal
  • Avoids linear loads like motors from drawing non-linear current & thus improves their efficiency
  • Motors do not develop torque ripple and thus protect connected mechanical equipment e.g. gears
  • Prevents overheating of transformers and cables
  • Ensures compliance with electricity network provider regulations

Standard Features

  • RMS Current capability:
    • @ 480 VAC: 30 A , 50 A , 120 A , 150 A , 240 A , 360 A(rms)
    • @ 690 VAC: 90 A , 180 A , 270 A(rms)
  • Compensation with high efficiency:
    • Harmonic mitigation up to 49th harmonic (up to 100th Harmonic for larger ratings)
    • Reduced Reactive power
    • Reduced Unbalance
  • Harmonic reduction : >98%
  • Wall mounted for 30A design and cabinet mounted for larger currents
  • 3-wire design
  • Air-cooled
  • Simple operation
  • Current control and sensorless control
  • EMC Compatible (EN 61000-6-2, EN 61000-6-4)
  • Advanced digital control and low response time
  • Several units can be operated in parallel for higher power ratings
  • Non-overloadable and insensitive to changes in network or load conditions
  • Main fuse block included and high short circuit capacity
  • Easy installation, commissioning and maintenance

Applications

  • Harmonic/reactive power suppression in
    • 3-phase systems
    • Industrial production machines (e.g. mills, presses) Variable speed drive systems (AC drives, DC drives) Electrical welding systems
    • Plastic machinery (extruders, injection moulders, film treatment machines) Power generation systems and UPS equipment
    • Electrolytic processes
    • Induction heating

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