“harmonics and power quality” - apqi · “harmonics and power quality ... •saturation of...
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“Harmonics and Power Quality”
Case Studies
MSEDCL
28th November 2015
Mohammed Mohtasib
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Reactive Power Compensation
• Penalty / incentive mechanism for power
factor improvement
• Maximum 7% incentive on unity power
factor
• In metering, kVArh leading = 0
• Industries tend to keep power factor
leading “BY ADDITIONAL FIXED
CAPACITORS” to avail maximum benefit
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Impact of additional capacitors
• Harmonic amplification
• Chances of resonance
• Saturation of transformer and motors due
to voltage rise
• Saturated transformer and motors
generates more harmonics
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Power Quality Impact on Consumer
Each consumer have practically few or all power quality issues.
Due to increases non linear loads, harmonic generation is major concern
Generated harmonics distorts voltage waveform
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Power Quality Case Studies
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CASE STUDY
PRODUCTIVITY IMPROVEMENT
AND REDUCTION IN SEC
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PROBLEMS FACED BY THE PLANT
• Regular failure in a Steel Wire Rope Mill
– High Failure Rate of Motors
– High Failure rate of control cards
– Nuisance tripping of circuit breakers
– Failure of SWG
• SEC was 173 kWh/Ton
• Production cost – INR 1064 per ton
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HARMONICS
Before……
• High harmonic content – Vthd and Ithd
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Vthd - Transformer A – 12%
Transformer B - 15%
Ithd - Transformer A – 21%
Transformer B - 60%
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HARMONICS
After ……
• After installation of passive filter
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Vthd - Transformer A – 2.1%
Transformer B - 1.2%
Ithd - Transformer A – 11.2%
Transformer B - 7.2%
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BREAK DOWN ANALYSIS
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SUMMARY OF BREAKDOWN
ANALYSIS
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Average monthly cost saving of 240,000
Average increase in production time 98 hours per month
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SPECIFIC ENERGY CONSUMPTION
& PRODUCTIVITY
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FINANCIAL ANALYSIS
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CASE STUDY -
Distribution Network Voltage
Related Power Quality Issues
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Distribution Network Voltage Issues
Coca Cola• Coca Cola – Leading beverage
manufacturer, one of the plant at Khurda,
Orissa
• Receives power from 220 kV grid – 25 KM
from plant
• Same grid also supplies to traction load
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SLD of Grid Distribution System
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Problem Faced
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• Unscheduled power cuts and voltage
unbalance
• Un balanced voltage
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Problem Faced …contd
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• Voltage variation – On 33 kV incomer
variation is from 26.7 to 34.2 kV
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Problem Faced …contd
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• Voltage variation – On LT Side incomer
variation is from 203 to 252 V
• SCADA recorded voltage dips as low as
20 Volts
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Problem Faced …contd
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• Voltage Sags and Swells
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Problem Faced …contd
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• Voltage & Current Harmonics 4.3% &
22.7%
• Voltage harmonics close to limit specified
by IEEE – 519 as 5%
• Current Harmonics on higher side
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Impact on Productivity and Financial
Loss
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• With each interruption and event of power
quality, plant was facing production loss
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Temporarily PQ Mitigation Adopted
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• Use of DG set instead of grid power
• Use of UPS for critical machines – almost
1.8 MVA
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Annual Monetary Loss
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• Annual loss is through:
– Loss in productivity
– Additional cost due to continuous operation of
DG set
• Annual loss suffered by plant in terms of
loss in productivity and higher energy cost
is INR 62.5 Million per year.
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Asia Power Quality Initiative• Program initiated in Asia with the background of the European
Experiment (LPQI) – Continuing Professional Development
• A neutral collaborative platform shared by National Support Network (NSN) Partners to promote education and awareness and facilitate policy changes.
• Objective:
– help industries in Asia address Power Quality issues as a means to enhance their competitiveness in terms of better production output quality, reduced production costs, reduced production line interruption and batch losses.
– Building up capacity of industry / service sector in identifying and addressing PQ issues as a means to enhance their continuous quality delivery
– Facilitate policy changes and market transformation towards „Safe and Quality Power for All‟.
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APQI India
APQI India - National Support Network
Reach out to manufacturing industries
Reach out to electrical engineers and designers
Provide technical content
Support dissemination
• Business intermediaries
• Academics, consultants, PQ advocates
• PQ equipment suppliers, contractors
• Professional associations, institutes, societies
• Specialized media, event organizers
Provide official endorsement,
Lead policy and regulatory activities
• Policy makers, utilities
A neutral collaborative platform shared by National Support Network
(NSN) Partners to promote education and awareness and facilitate
policy / regulatory changes.
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Learning from APQI : A focus
around 3 Missions
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Education &
training fine tuned
for individuals
A reference
for all PQ matters
in Asia
Lead the dynamic
through adequate
knowledge
management &
E-disseminationPrint publications
Electronic library
A network of European /Asian
PQ experts
(standardization/certification
body participation)
Leads appropriate PQ study
(PQ Survey,
PQ Regulation report)
Website
Forums
Seminars
Webinars
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Ensuring High Power Quality is every
professional’s responsibility
High Power Quality benefits all
It increases productivity, profitability & competitiveness,
It improves customer relationship & ensures better employee loyalty
Visit : www.apqi.org51