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Overcome challenges of harmonics

ABB ultra-low harmonic drives

  • keep the electrical network clean
  • reduce the risk of disturbances
  • prevent damage to other equipment
  • prevent interference with communications equipment
  • reduce the installation footprint
  • reduce the total cost of ownership

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Harmonics cause interruptions, interference and downtime

Harmonics pollute the electrical network and make equipment connected to it behave erratically.

Harmonics can cause damage to sensitive electronic equipment, interference in communication equipment, and false readings on measurement devices. Harmonics can trip circuit breakers, blow fuses and cause capacitor failures. The effects also include overheating of transformers, cables, motors, generators and capacitors. Equipment must be designed to tolerate harmonics in the network and oversizing leads to higher investment costs and underutilized capacity.

The problems caused by harmonics result in increased losses because more energy is wasted due to overheating, equipment has a shorter life time and is subject to unreliable operation. In the worst cases, harmonics cause unnecessary and unwanted process interruptions.

ABB solution with ultra-low harmonic drives
What are harmonics

Prevention is better than a cure for the symptoms – ABB ultra-low harmonic drives

Instead of trying to tackle harmonics by often ineffective actions, like adding cooling or over-dimensioning equipment, why not employ equipment that do not cause harmonics in the first place?

Low harmonic content

Our ultra-low harmonic drive produces exceptionally low harmonic content and exceeds requirements set by low harmonic standards. Compared to a conventional drive, the harmonic content is reduced by up to 97%. The total harmonic current distortion is typically 3%. With a passive filter the typical total harmonic distortion is between 5 to 10%.

    Harmonic content reduction up to
          Harmonic distortion typically

Simple and cost-efficient installation

The compact ultra-low harmonic drive has harmonics mitigation built into the drive. This includes an active supply unit and integrated low harmonic line filter. With our All Inside –design there is no need for external filters, multi-pulse arrangements or special transformers. The simple installation offers significant savings in space, time and money.

As the risk of overheating is reduced with the reduction of harmonic currents, there is no need to over-dimension equipment, such as transformers and cables.

Output voltage stabilization - secured operation and optimized dimensioning

The active supply unit in the drive is able to boost output voltage to guarantee full motor voltage even when the supply voltage is below nominal. This secures reliable operation in weak networks.

The voltage boost capability can be utilized to overcome a voltage drop caused by long supply or motor cables. Thus, there is no need to over-dimension the motor or supply transformer due to long cables.

The possibility to stabilize the output voltage of an ultra-low harmonic drive is an advantage compared to passive filter solutions. At nominal loads with a passive filter there is typically a 5% voltage drop. On partial loads on the other hand the voltage over the passive filter can rise by up to 10%, creating the possibility of an overvoltage fault occuring.

Efficient energy utilization

The ultra-low harmonic drives achieve a unity power factor. This high power factor indicates that the electrical energy is used to its full potential.

The drive offers a possibility for network power factor correction in order to compensate for low power factors of equipment connected to the same network. It reduces the need for additional power factor correction equipment, such as filters and large capacitor banks. It can also help to avoid penalty charges set by electrical utilities for poor power factors.

As harmonic currents are reduced, equipment wastes less energy and energy efficiency is considerably improved.

For all industries and applications

Our ACS880-37 cabinet-built ultra-low harmonic drives are customized to meet the precise needs of most industries, such as the oil and gas, power, pulp and paper, marine, food and beverage, metals and mining industries.

COMING 2017

During 2017 the ABB ultra-low harmonic drive portfolio will be expanded with the following variants:

  • The ACS880-31 wall-mounted ultra-low harmonic drive is customized to meet the precise needs of most industries.
  • The ACH580-31 ultra-low harmonic drive is specifically designed for the HVAC (heat and ventilation) industry. It offers built-in HVAC specific functionality.

Harmonics

In an ideal case, the current in an electrical grid is a pure sine wave and does not contain harmonics.
In reality the current deviates from this pure sine wave and contains harmonics.


A pure sinusoidal voltage and current does not contain any harmonics







Voltage and current that deviate from the sine form contain harmonics

The total amount of harmonics is expressed as a THD% value (= total harmonic distortion).

What causes harmonics

Harmonics are introduced into the electrical network by non-linear loads, such as

  • power supplies of PCs, PLCs, TVs etc.
  • photocopiers, domestic appliances
  • diode and thyristor bridges
  • uninterruptible power supplies
  • motor starters
  • switched-mode power supplies
  • variable speed drives

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