The problem of quality electrical energy
provided to the users has arisen. This is due to the increasing presence in
network of nonlinear loads.They constitute a harmonic pollution source of the
network, which generate many disturbances, and disturb the optimal operation of
electrical equipments. This work, proposed a solution to eliminate the
harmonics introduced by the nonlinear loads. It presents the analysis and
simulation using Matlab Simulink of a active power filter (APF) compensating
the harmonics and reactive power created by nonlinear loads in steady and in
transients. The usefulness of the simulation approach to APF is demonstrated ,
have a better power quality insight using Matlab Simulink in order to develop
new fuzzy logic controller based active power filter.
KEYWORDS:
1. Active Power Filters
2. Harmonics
3. Fuzzy Logic Controller
4. MATLAB
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure 1 Block diagram of Basic Active Power Filter
EXPECTED SIMULATION RESULTS:
Fig. 2 Three phase voltage and current waveform with
non linear load
Fig.3 THD analysis of three phase voltage waveform
with nonlinear load
Fig.4 Three phase voltages and current waveform with
shunt active power filter with connected fuzzy logic controller
Fig.5 THD analysis of voltages with shunt active
power filter using fuzzy logic controller
CONCLUSION:
The
paper presents the application of the fuzzy logic controller to control the
compensating voltage. The Mamdani max-min approach is used for the fuzzy
inference and the defuzzification method, respectively. The design of input and
output membership for the fuzzy logic controller is very important for the
system performance. The simulation results show that the fuzzy logic controller
provides a good performance to control the compensating voltage of shunt active
power filter. The %THD of the voltages at PCC point can be followed the IEEE
Std. 519-1992.
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