ABSTRACT:
Low
power distribution systems have severe power quality issues due to the non-linearity
of several residential and industrial loads. The main power quality issue is
the harmonics leading to the overheating of the transformers in the
distribution systems. By employing passive filters, active filters, and custom
power devices, the harmonics in the source current can be reduced. To overcome
the drawbacks of conventional tuned filters and active power filters the
modified shunt active power filter was introduced with the fuzzy logic
controller. In this paper, an effective way of reducing the total harmonic
distortion using three-phase three-wire shunt active filter is carried out and
this has been investigated through three control methods namely synchronous
reference frame theory, real and reactive power theory, and indirect reference
current theory. The recognized control methods are implemented with the fuzzy
controller to improve the performance of the induction motor drive. The
hardware setupwas implemented for the proposed fuzzy-based control technique to
achieve better performance in terms of reduced total harmonic distortion and DC
link voltage and improved speed performance of induction motor drive when
compared to other control methods. Further power factor correction and better
reactive power compensation are achieved by implementing hardware.
KEYWORDS:
1. Power
quality
2. SPAF
3. FUZZY
controller
4. Total
harmonics distortion
5. DC
link voltage
6. Induction
motor drives
SOFTWARE: MATLAB/SIMULINK
SCHEMATIC DIAGRAM:
Figure 1. Schematic Representation Of The Srf
Control Technique For Shunt Apf.
EXPECTED SIMULATION RESULTS:
Figure 2. Voltage And Current Waveforms Of Sapf
Using Srf Method (A) Source Voltage (B) Load Current (C) Voltage At Pcc (D)
Source Current (E) Filter Current (F) Dc Link Voltage.
Figure 3. A To C Active And Reactive Power Of
Sapf: A) By Irct Method B) By P-Q Method C) By Srf Method.
Figure 4. A To C Power Factor Of Sapf: A) By Irct
Method B) By P-Q Method C) By Srf Method.
Figure 5. Capacitor Dc-Link Voltage Of Three Control Strategies.
Figure 6. Voltage And Current Waveforms Of Sapf
With An Induction Motor Drive Load (A) Input Voltage (B) Load Current (C)
Voltage At Pcc (D) Input Current (E) Filter Current (F) Dc Link Voltage.
Figure 7. Rotor Current, Speed In Rad./Sec. And
Torque Of Induction Motor Drive.
CONCLUSION:
The
simulating of the non-linear system of bridge rectifier with and without SAPF
has been analyzed.The % THD has been decreased from 63.8 % to 0.48 % in the SRF
method,2.04 % in the p-q method,6.67 % in the IRCT method,1.30 % for the
induction motor drive load,1.07 % for the different load is considered. The
hardware setup as implemented for the proposed work and the Power factor is
improved by the percentage of 6.38 %, Reactive power compensation is achieved
up to 88.3 % and Source current harmonics is reduced from 23.9 % to 3.2 %.The
system has been analyzed with two types of load. For the bridge rectifier load,
the total harmonic distortion was reduced to 0.48 %. In the induction motor
drive load the % THD is reduced to 1.30%,It shows that the active filter is
providing reduced % THD for the different types of load and the robust speed performance
has been achieved using fuzzy-based SAPF techniques.
REFERENCES:
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[3]
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