Power Quality and Its Impact on Electrical Systems
Power Quality
by
Rajini Kanth P
Assistant Professor, Department of EEE,
Methodist College of Engineering and Technology
What is Power Quality(PQ)?
It is a combination of Voltage quality and current quality. Thus power quality is concerned with
deviations of voltage and or current from the ideal waveform( pure sinusoidal wave).
Quality of Supply:
Quality of power supply includes a technical part (voltage quality) plus a non technical part
sometimes referred to as “Quality of service”. the latter covers the interaction between the customer
and the utility, eg., the speed with which the utility reacts to complaints.
IEEE Definition of PQ:
“Power quality is a concept of powering and grounding sensitive equipment in a matter that is suitable
to the operation of that equipment”
Why power Quality is Important?
How does power quality affect the
economy?
List of the types of power quality phenomena according to IEEE 1159-1995:
a.
Short Duration Variations
•
Voltage sag
•
Voltage swell
•
Interruption
b.
Long Duration Variations
•
Undervoltage
•
Overvoltage
•
Sustained Interruption
c.
Voltage Unbalance
d.
Waveform Distortion
•
DC Offset
•
Harmonics
•
Interharmonics
•
Notching
•
Noise
e.
Electric Transients
f.
Voltage fluctuations (Flicker)
g.
Power Frequency Variation
Categories and Characteristics of Power System Electromagnetic Phenomena
Power quality problems can be resolved in any of the following ways:
1.
Design equipment and electrical systems to prevent electrical disturbances from causing
equipment or systems to malfunction.
2. Analyze the symptoms of a power quality problem to determine its cause and solution.
3. Identify the medium that is transmitting the electrical disturbance and reduce or eliminate
the effect of that medium.
4. Treat the symptoms of the power quality problem by the use of power conditioning
equipment. Power conditioning equipment mitigates a power quality problem when it occurs
•
Power conditioning equipment
needs to be
used for maintaining loads coming from the
power grid to the equipments like
Transient
Voltage Surge Suppressors, Noise filters,
Harmonic filters, Isolations Transformers,
Voltage Regulators, Dynamic Voltage restorer,
Uninterruptible Power Supply,
Generators,
etc
Remedies to Improve power quality problems:
UPS:
Power quality refers to the characteristics of electrical power that drives sensitive equipment. It involves voltage and current deviations from ideal waveforms, impacting the efficiency and reliability of electrical systems. Various types of power quality phenomena exist, such as voltage variations, waveform distortions, and frequency fluctuations. Maintaining good power quality is crucial to ensure the proper functioning of equipment and avoid economic losses. Strategies for resolving power quality issues include designing systems to prevent disturbances, analyzing problem symptoms, identifying mediums causing disturbances, and using power conditioning equipment for mitigation.
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Presentation Transcript
Power Quality Power Quality by Kanth P P Rajini Rajini Kanth Assistant Professor, Department of EEE, Methodist College of Engineering and Technology
What is Power Quality(PQ)? It is a combination of Voltage quality and current quality. Thus power quality is concerned with deviations of voltage and or current from the ideal waveform( pure sinusoidal wave). Quality of Supply: Quality of power supply includes a technical part (voltage quality) plus a non technical part sometimes referred to as Quality of service . the latter covers the interaction between the customer and the utility, eg., the speed with which the utility reacts to complaints. IEEE Definition of PQ: Power quality is a concept of powering and grounding sensitive equipment in a matter that is suitable to the operation of that equipment
How does power quality affect the economy?
List of the types of power quality phenomena according to IEEE 1159-1995: a. Short Duration Variations Voltage sag Voltage swell Interruption b. Long Duration Variations Undervoltage Overvoltage Sustained Interruption c. Voltage Unbalance d. Waveform Distortion DC Offset Harmonics Interharmonics Notching Noise e. Electric Transients f. Voltage fluctuations (Flicker) g. Power Frequency Variation
Categories and Characteristics of Power System Electromagnetic Phenomena
Power quality problems can be resolved in any of the following ways: 1. Design equipment and electrical systems to prevent electrical disturbances from causing equipment or systems to malfunction. 2.Analyze the symptoms of a power quality problem to determine its cause and solution. 3. Identify the medium that is transmitting the electrical disturbance and reduce or eliminate the effect of that medium. 4. Treat the symptoms of the power quality problem by the use of power conditioning equipment. Power conditioning equipment mitigates a power quality problem when it occurs
Power conditioning equipment needs to be used for maintaining loads coming from the power grid to the equipments like Transient Voltage Surge Suppressors, Noise filters, Harmonic filters, Isolations Transformers, Voltage Regulators, Dynamic Voltage restorer, Uninterruptible Generators, etc Power Supply,
