ABSTRACT:
The electrical power quality at low
voltage alternative networks became a serious concern because of the increased use
of nonlinearloads and pollutants. This work is to improve the quality of
electric current in such networks. Four-Wire Shunt Active Filter is studied;
deferent loads (balanced and unbalanced) are discussed. We propose to identify
harmonic and reactive currents at the base of Self-Tuning-Filters, which proved
very good filtering performance, either in transient or steady state. The
simulations demonstrate the importance of this work in harmonic filtering and
reactive power compensation.
KEYWORDS
1.
Shunt Active Filter (SAF)
2.
Total Harmonic Distortion(THD)
3.
Self-Tuning-Filter (STF)
4.
Unbalanced loads
SOFTWARE:
MATLAB/SIMULINK
Fig.
1. Block diagram of the APF
Fig.2
Simulation results of STFs under three balanced loads:
(a)
Supply and loads currents, (b) 1st phase filter current, (c) Neutral currents,
(d)
Harmonic current spectre of 1st phase load, (e) Harmonic current spectre of 1st
phase of supply
(a)
Source and loads currents, (b) Neutral currents, (c) Filter currents,(d)
Harmonic currentspectres of loads,(e) Harmonic current spectres of supply
CONCLUSION:
In this paper we have presented a new
tree-phase for-wire active power filter based on STF extraction, to
identifyharmonic current and reactive power. The objective was to improve the
dynamic of identification method and also selectivity. The advantages of this
filter are: STFs don’t introduce any displacement between input and output, at
the fundamental pulsation. Good dynamic,and high selection of fundamental
signal. Their selectivity is improved by reducing K. They can filtrate the
voltages that are used to calculate instantaneous powers, to identify perturbation,
and so PLL is not used. This method reduces the complexity of the control
scheme and consequently facilitates the digital implementation of the control
system. Those results demonstrate the good performances of the proposed
control.
REFERENCES:
[l] M. Abdusalam, P. Poure,S. Saadate,
“Hardware Implementation of a Three-PhaseActive Filter System with
HarmonicIsolationBased on Self-Tuning-Filter”, IEEE. Power Electronics
Specialists Conference, Aug. 2008, pp. 2276-2278.
[2] M. Abdusalam, P. Poure, S. Saadate,
“A New Control Method of Hybrid Active Filter to Eliminate the 5th and 7th Harmonic
Frequency Using Self-Tuning-Filter in the Feedforward Loop”. IREE,
International Review of Electrical Engineering, Feb. 2008, pp. 65-72.
[3] A Ghamri, M.T Benchouia, A.Golea.,Sliding-mode
Control Based Three-phase Shunt Active Power Filter: Simulation and Experimentation;
Electric Power Components and Systems Journal, 2012, 40( 4): 383-398.
[4] M. Abdusalam, P. Poure, S. Saadate,
“A New ControlScheme of Hybrid Active Filter Using Self-Tuning Filter”, POWERENG,
International Conference on Power Engineering , Energy and Electrical Drives, Setubal
Portugal,April. 2007, pp. 12-14.
[5] M.C. Benhabib, S. Saadate, “ New
Control Approach for Four-Wire Active Power FilterBasedon the Use of
Synchronous Reference Frame”,Elsevier B.V. Electric Power Systems Research
73,Nov. 2004, pp. 353–362. .