7/30/2019 What is Custom Power

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What is Custom Power?

The term custom power has been coined to describe distribution system level power-conditioning products. This is primarily

because the market for these multi megawatt power-conditioning solutions is nowhere near the size of the market for traditional

facility-level PQ and reliability, such as uninterruptible power supplies (UPS) and surge protectors.

In many cases, a customized system design is required to properly integrate power conditioning to the specific distribution

system where it is applied.Custom power is formally defined as the employment of power electronic or static controllers in distribution systems rated up to

38 kV for the purpose of supplying a level of reliability or PQ that is needed by electric power customers who are sensitive to

power variations. Custom power devices or controllers, include static switches, inverters, converters, injection transformers,

master-control modules and energy-storage modules that have the ability to perform current-interruption and voltage-regulation

functions within a distribution system.

Each custom power device can be considered to be a type of power-conditioning device. In general, power-conditioning

technology includes all devices used to correct end-user problems in response to voltage sags, voltage interruptions, voltage

flicker, harmonic distortion and voltage-regulation problems. While the term power conditioning has no voltage boundary, the

term custom power is bound by the scope of IEEE P1409 Guide for Application ofPower Electronics for Power Quality

Improvement on Distribution Systems Rated 1 kV through 38 kV. This scope limits the location of a custom power device to a

medium-voltage primary distribution system. Other than their kVA rating, the technologies used at medium and low voltage

often are similar; however, custom power devices generally have load ratings in excess of 500 kVA. The main custom power

configurations are:

Static series compensator (SSC) provides ride-through for sags by injecting a signal to offset the voltage lost during the sag.

Backup stored energy provides ride-through for sags and momentary interruptions by using stored energy (batteries, superconducting coil,ultracapacitors).

Static transfer switch provides ride-through for momentary interruptions and most voltage sags by quickly switching between two differentutility feeders.

Reactive power and harmonic compensation devices provide dynamic compensation to the power system when temporary corrections arerequired to support varying loads and power-system stability conditions.

Read more:http://tdworld.com/mag/power_custom_power_choices/#ixzz2F0l0sws4

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