In affect the quality of delivered power. One of

In recent years,
there has been an increased emphasis on the quality of power delivered to
factories, commercial establishments, and residences. This is due in part to
the prevalence of harmonic-creating systems in use. Such harmonic generating
equipment contributes to the harmonic burden the system must accommodate. In
addition, utility switching and fault clearing produce disturbances that affect
the quality of delivered power. One of the biggest problems in power quality
aspects is the harmonics content in the electrical system. Generally, harmonics
may be divided into two types: voltage harmonics and current harmonics. Current
harmonics is usually generated by harmonics contained in voltage supply and
depends on the type of load such as resistive load, capacitive load, and
inductive load. Both harmonics can be generated by either the source or the
load side 1, 2.


generated by load are caused by nonlinear operation of devices, including power
converters, arc-furnaces, gas discharge lighting devices, etc. Load harmonics
can cause the overheating of the magnetic cores of transformer and motors. On
the other hand, source harmonics are mainly generated by power supply with
non-sinusoidal voltage waveform. Voltage and current source harmonics imply
power losses, electromagnetic interference and pulsating torque in AC motor
drives 3.

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Much of the equipment in use
today is susceptible to damage or service interruption during poor
power-quality events. Everyone with a computer has experienced a computer
shutdown and reboot with a loss of work resulting. Often this is caused by poor
power quality on the power line. Poor power quality also affects the efficiency
and operation of electric devices and other equipment in factories and offices.


IEEE has done
significant work on the definition, detection, and mitigation of power quality
events. IEEE Standard 1100 (IEEE 1999) defines power quality as the concept of
powering and grounding sensitive electronic equipment in a manner suitable for
the equipment. Electrical equipment susceptible to power quality or more
appropriately to lack of power quality would fall within a seemingly boundless
domain. All electrical devices are prone to failure or malfunction when exposed
to one or more power quality problems. The electrical device might be an
electric motor, a transformer, a generator, a computer, a printer,
communication equipment, or a household appliance. All of these devices and
others react adversely to power quality issues, depending on the severity of
problems 4.