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Brief introduction to active power filters
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ACTİVE POWER FİLTERS
Emre DURNA
OUTLİNE Definition of POWER QUALITY Definition of Harmonic Components Elimination of Current Harmonics Passive Filters Active Power Filters
Voltage Sourced Active Power FiltersCurrent Sourced Active Power Filters
Active Power Filter vs Passive Filter Active Filter Application of TUBİTAK UZAY Summary References
DEFİNİTİON OF POWER QUALİTY
Power quality is the set of limits of electrical properties that allows electrical systems to function in their intended manner without significant loss of performance or life
Reliable Mains:Magnitude (Rated Voltage)Frequency (50 Hz)SustainabilityStability
DEFİNİTİON OF HARMONİC COMPONENTS All of the signals can be represented as
the summation of sinusoidal signals of various frequencies.
DEFİNİTİON OF HARMONİC COMPONENTS
+ = +
Fundemental
5th Harmonic
Component
7th Harmonic
Component
Resultant Signal
DEFİNİTİON OF HARMONİC COMPONENTS In Power Systems, harmonics appear on the
current signals. Motor Drives, Soft Starters, UPS Power Electronic Converters Industrial Loads, Single Phase Loads AC to DC Converters (Rectifiers)
are typical harmonic current sources. Current Harmonics,which reduces the
power quality, are harmful for vulnerable loads. It distorts mains voltage.
Electronic Devices Motors Illumination Systems
ELİMİNATİON OF CURRENT HARMONİCS Vulnerable loads should be isolated from
the harmonic sources. Power System transmission lines and
transformers are over-loaded. Electromagnetic noises in systems.
So, current harmonics should be eliminated
CURRENT HARMONICS ELIMINATION SYSTEMSPASSIVE FILTERSACTIVE POWER FILTERS
PASSIVE FILTERS
Pasive Filters are composed of passive circuit elements such as resistor,capacitor and inductor
For Passive Filters, the aim is to adjust the resonance frequency of the filter to desired harmonic elimination.
PASSİVE FİLTERS
ACTİVE POWER FİLTERS
Active Power Filters are simply power electronic converters, specifically designed to inject harmonic currents to the system.
Active Power Filter Capabilities;Eliminating Voltage and Current HarmonicsReactive Power CompensationRegulating Terminal VoltageCompensating the Voltage flickering
ACTİVE POWER FİLTERS
VOLTAGE SOURCED ACTİVE POWER FİLTER Voltage sourced active filters creates AC
voltage at its output terminal. Voltage sourced active filters use
capacitor (voltage sink) for DC Link. The output filter should be an inductor.
LF
Cdc
VOLTAGE SOURCED ACTİVE POWER FİLTER
Vdc
S1 S3 S5
S4 S6 S2
Lf
Cf
Voltage Sourced Active Power Filter Topology
CURRENT SOURCED ACTİVE POWER FİLTER Current sourced active filters creates AC
current at its output terminal. Current sourced active filters use
inductor (current sink) for DC Link. The output filter should be a shunt
capacitor.CF
Ldc
CURRENT SOURCED ACTİVE POWER FİLTER
Ldc
Cf
Lf
S1 S3 S5
S4 S6 S2
Current Sourced Active Power Filter Topology
ACTİVE VS PASSİVE FİLTERS
Passive Filters Cheap, Easy design,Reliable,High Efficiency
BUT Resonance Problems, Tuning for fixed frequency Fixed Reactive Power Compensation, Large Size
Active Filters No resonance problems, Can eliminate any
harmonics (no tuning), Voltage regulation, Reactive Power Compensation,Reliable Operation BUT
Expensive, Complex control systems
ACTİVE FİLTER APPLİCATİON OF TUBİTAK UZAY DENIZLI-2 TM Active Power Filter
(NATIONAL POWER QUALITY PROJECT)Specifically designed for 5th Harmonic
Filtering5 MVA Current sourced converter based shunt
active filter
ACTİVE FİLTER APPLİCATİON OF TUBİTAK UZAY
ACTİVE FİLTER APPLİCATİON OF TUBİTAK UZAY
Power Stage Panels
Control Panels
SUMMARY
Definition of POWER QUALITY Definition of Harmonic Components Elimination of Current Harmonics Passive Filters Active Power Filters
Voltage Sourced Active Power FiltersCurrent Sourced Active Power Filters
Active Power Filter vs Passive Filter Active Filter Application of TUBİTAK
UZAY
REFERENCES
Wikipedia. Power Quality en.wikipedia.org/wiki/Power_quality
Denizli 2-TM Training Documents. TÜBİTAK UZAY, Power Electronics Group.
A Current Sourced Converter based Active Power Filter for mitigation of harmonics at the interface of distribution and transmission systems. Terciyanlı,A.; Avcı,T ; Ermiş, M. ; Çadırcı, I.
THANK YOU.
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