PI tuning of Shunt Active Filter using GA and PSO Algorithm
ABSTRACT
In this paper p-q theory is used as control technique
for active filter which minimizes the lower order harmonics in the power
system. This method improves the supply side current quality. The control
strategy uses the PI controller for controlling the DC link voltage in the
system. The PI controller parameters are selected generally with intuitive method
of PI tuning. Iteratively it is identified that PI parameters highly affect in
the THD of the system input current. So there is a need of optimal selection of
parameters of the PI controller. In this method Genetic Algorithm (GA) and
Particle Swarm Optimization (PSO) are used for selection of optimal parameters for
PI controller.
KEYWORDS
1.
Active Filters
2.
Genetic Algorithm
3.
Optimisation Techniques
4.
P-q theory
5.
Particle Swarm Optimisation
SOFTWARE:
MATLAB/SIMULINK
SIMULINK MODEL:
Fig.1 Simulink model of shunt active
filter
EXPECTED SIMULATION RESULTS
Fig.2
current waveform for before compensation
Fig.3
source voltage and source current after compensation for GA
Fig.
4 compensation current and pulses produced by controller
Fig.5 source voltage and source current
after compensation for PSO
Fig.6 compensation current and pulses
produced by controller for PSO
CONCLUSION
The shunt active filter is designed with
the optimization algorithms to tune the parameters of PI controllers. The
values are selected optimally by using the GA and PSO algorithm. GA requires
more converging time compared to PSO due to many operations. PSO converges with
lesser THD compared with GA where the number population also less compared to
GA. So PSO delivers the best results compared to GA and implementation also
simple.
REFERENCES:
[1] Ned Mohan 2002, ‘Power Electronics:
Converters, Applications, and Design’ 3rd Edition’, Wiley publications _
[2] Bhattacharya,S Frank,TM, Divan,DM &
Banerjee, B 1998, ‘Active filter system implementation’, IEEE Ind. Appl. Mag.,
4(5): 47–63. _
[3] Bhattacharya, C. Chakraborty, &
Bhattacharya,S 2009, ‘Current compensation in shunt type active power filters’,
IEEE Ind. Electron. Mag., 3(3): 38– 49.
[4] Bhim Singh, Kamal Al-Haddad &
Ambrish Chandra 1999, ‘A New Control Approach to 3-phase Active Filter for
Harmonics and Reactive Power Compensation’, IEEE Trans. on Power Systems,
46(5):133– 138.
[5] Davood yazdani, Alireza Bakhshai &
Praveen K.Jain 2010, ‘A Threephase Adaptive Notch filter based Approach to
Harmonic /Reactive current extraction and harmonic decomposition’, IEEE
Transactions on Power electronics, 25(4): 914-922.
