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An Overview on Power Quality Improvement using Multilevel Inverter based Dynamic Voltage Restorer. Ms. M. Maheswari. Introduction. Quality : A measure of excellence or a state of being free from defects, deficiencies and significant variations . Power Quality: - PowerPoint PPT Presentation
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An Overview on
Power Quality Improvement
using Multilevel Inverter based Dynamic Voltage Restorer
Ms. M. Maheswari
6/21/2014 Power Quality Improved using DVR 1
IntroductionQuality:
A measure of excellence or a state of being free from defects, deficiencies and significant variations.
Power Quality:Worthiness of electrical power to consumer devices i.e. not to disturb or damage appliances and devices.
6/21/2014 Power Quality Improved using DVR 2
Parameters considered for Power Quality
Voltage MagnitudeFrequency Wave-shape.
6/21/2014 Power Quality Improved using DVR 3
Effects of Power Quality Power Quality issues cause business problems such
as:
– Lost productivity, wastage of manpower and equipments
– Customer and/or management dissatisfaction
– Heavy financial impact
According to Electric Light and Power Magazine, 30% to 40 % of All Business Downtime Is Related to Power Quality issues.
6/21/2014 Power Quality Improved using DVR 4
Why Power Quality is Big issue Presently?
– Widespread Usage of Sensitive Loads in all Applications (PLC based equipments, Computers and the like)–For certain devices, a momentary
disturbance may result in • scrambled data• interrupted communications• a frozen mouse • system crashes and equipment failure
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Power Quality = Voltage Quality
P=V*I * CosΦ
V – Supply Voltage – Always ConstantI and CosΦ – Depends on the nature of load
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Power Quality / Voltage Quality Issues
• Voltage Sag
• Voltage Swell
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Power Quality / Voltage Quality Issues
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• Interruption
• Harmonics
Major Power Quality (PQ) Problems
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Source: EPRI, 1994
Spikes, 7%
Sags, 56%
Outages,
6%
Swells,
31%
Importance of Voltage Sag
6/21/2014 Power Quality Improved using DVR 10
Textile Industry
Plastics Industry
Glass Industry
Process Industry
Semiconductors
Rs.60k
Rs. 60L Rs6 Cr Rs. 60 CrLosses per Voltage Sag Event
Rs.600k
PQ Improvement Techniques
Series CompensationDVRSSC
Shunt CompensationSTATCOMTCSCSeries and Shunt Compensation
TCSCUPFC
6/21/2014 Power Quality Improved using DVR 11
Dynamic Voltage Restorer (DVR)
Series compensation device Protects sensitive electric loads
from PQ problems Implemented through power
electronic controllers that use voltage source converters (VSC).
6/21/2014 Power Quality Improved using DVR 12
Block Diagram of DVR
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Operation of DVR
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a
N
VaN
Twentyseven Level Inverter
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Questions???
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