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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