improvement of electrical power quality using series active and shunt passive filter
1. Improvement of the Electric Power Quality
Series Active and Shunt Passive Filters
SEMESTER – VIII
Electrical & Electronics Engineering Dept.
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I am highly indebted to Dr. Rajshekhar P. Mandi and Mahesh
G.S Sir for their guidance and constant supervision as well as
for providing necessary information regarding the project.
I would like to express our gratitude to the HOD-
Puttamaddapa for his kind co-operation and encouragement.
I would like to express our special gratitude and thanks to our
PRINCIPAL- Dr. Sunil S. Manvi for giving us such attention
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3. Outlines of the Presentation
Introduction and Background
Elimination of Current Harmonics
Series active filter and parallel passive filter.
Series active power and passive filter
The vector transformations
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It is constituted by a series active filter and a passive filter
connected in parallel with the load.
The control strategy is based on the vectorial theory dual
formulation of instantaneous reactive power.
The filter impedance has to be smaller than the source
impedance in order to eliminate source current harmonics.
Not suitable for variable loads & Resonant drawback
An active power filter in series to the ac source impedance
improves the compensation characteristics of the passive
filters in parallel connection.
Generation of a voltage proportional to the source current
harmonics is use for elimination of series and parallel
resonances with the rest of the system.
Simulations on the MATLAB-Simulink platform.
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Traditionally a passive LC power filter is used to eliminate
current harmonics when it is connected in parallel with the
load .This compensation equipment has some drawbacks.
So active power filter, typically consists of a three-phase
pulse width modulation voltage source inverter is used.
The instantaneous reactive power theory is widely used as a
control strategy for the APF. This theory is based on a
Clarke coordinate transformation from the phase coordinates
As par IEEE 519-1992 IEEE recommended practices under
requirements for harmonics control in electrical power
system, the total harmonic distortion (THD) should be <5%
for non linear loads.
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Harmonic current drawn from a supply by the nonlinear
load results in the distortion of the supply voltage waveform
at the point of common coupling (PCC) due to the source
Both distorted current and voltage may cause end-user
equipment to malfunction, conductors to overheat and may
reduce the efficiency and life expectancy of the equipment.
A passive LC power filter is used to eliminate current
harmonics when it is connected in parallel with the load.
It has some drawbacks like overheating, bulk in size,
Resonant drawback and required maintenance due to which
the passive filter cannot provide a complete solution.
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9. The vector transformations
The vector transformations from the phase reference system a-b-c
to α- β-0 coordinates can be obtained, thus
The instantaneous real power in the α- β-0 frame is calculated as
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10. What more in feasibility analysis?
Simulations have been carried out on the MATLAB-Simulink
platform with different loads and with variation in the source
This analysis allowed an experimental prototype to be developed
Experimental and simulation results are presented
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• A control algorithm for a hybrid power filter constituted by a series
active filter and a passive filter connected in parallel with the load is
proposed. The control strategy is based on the dual vectorial theory of
electric power. The new control approach achieves the following
1. compensation characteristics do not depend on the system impedance.
2. eliminates the risk of overload.
3. compensator can be applied to loads with random power variation.
4. Series and/or parallel resonances with the rest of the system are
Therefore, with the proposed control algorithm, the active filter
improves the harmonic compensation features of the passive filter
and the power factor of the load.
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Electric Engineering Department, Huelva Univ., Huelva, Spain
S. P. Litran
2.F. Z. Peng and D. J. Adams, “Harmonics sources and filtering
approaches,in Proc. Industry Applications Conf., Oct. 1999, vol. 1, pp.
3. J. C. Das, “Passive filters-potentialities and limitations,” IEEE
Trans. Ind. Appli., vol. 40, no. 1, pp. 232–241, Jan. 2004.
4.H. L. Ginn, III and L. S. Czarnecki, “An optimization based method
for selection of resonant harmonic filter branch parameters,” IEEE
Trans.Power Del., vol. 21, no. 3, pp. 1445–1451, Jul. 2006.
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