improvement of electrical power quality using series active and shunt passive filter

Improvement of the Electric Power Quality Using

Series Active and Shunt Passive Filters

Presented byVIKRAM RAWANIUSN -1RE12EE120SEMESTER – VIII

Electrical & Electronics Engineering Dept.REVA ITM,Banglore-64

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Acknowledgment 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 and time.

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Outlines of the PresentationIntroduction and Background Elimination of Current HarmonicsSeries active filter and parallel passive filter.Series active power and passive filter topology.The vector transformationsSimulationConclusionReferences

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Introduction 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.Monday 1 May 2023 4

Background 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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Concerns 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 impedance.

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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Series active filter and parallel passive filter

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Series active power and passive filter topology.

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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 follows:

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What more in feasibility analysis?

SoftwareSimulations have been carried out on the MATLAB-Simulink platform with different loads and with variation in the source impedance.This analysis allowed an experimental prototype to be developed Experimental and simulation results are presented

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Simulation


Output waveform


Conclusion• 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 targets :-

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

avoided.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.


ReferencesAuthor(s)1.P. Salmeron Electric Engineering Department, Huelva Univ., Huelva, Spain S. P. Litran2.F. Z. Peng and D. J. Adams, “Harmonics sources and filtering approaches,in Proc. Industry Applications Conf., Oct. 1999, vol. 1, pp. 448–455.3. 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. 2006.5.ieeexplore.ieee.org/iel5/61/5437451/05361356.pdf?arnumber.


Thank You
