Particle Swarm Optimization
Based Shunt Active Harmonic Filter for Harmonic Compensation
ABSTRACT
This paper presents a performance evaluation of Shunt
Active Harmonic Filter (SAHF) for harmonic compensation, using Particle Swarm
Optimization algorithm for DC link voltage regulation. Particle Swarm
Optimization algorithm is used to search for the optimal PI control parameters.
The simulation results show that the performance of Shunt Active Harmonic
Filter (SAHF), where current is generated using instantaneous real and reactive
power(p-q) theory, using PSO technique for six pulse controlled rectifier under
different firing angles is simple in structure and very effective for harmonic compensation.
The simulation is done with the help of MATLAB-SIMULINK tool box.
KEYWORDS
1.
Shunt Active Harmonic Filter
2.
PI controller
3.
Hysteresis Current Controller
4.
P-q theory
5.
PSO
6.
Controlled rectifier
SOFTWARE:
MATLAB/SIMULINK
BLOCK DIAGRAM:
Fig.
1. Proposed implementation of PI controller
EXPECTED SIMULATION RESULTS
Fig. 2. Convergence graph of PSO for firing angle
Fig. 3. FFT analysis of source
current (phase a) without SAHF.
Fig.
5. FFT analysis of source current (phase a) of optimized SAHF for firing angle.
CONCLUSION
It
can be concluded from the simulation results that with the application of SAHF
in parallel to controlled rectifier, harmonics present in the source current
are mostly compensated. The DC link voltage is controlled by PI controller,
which when optimized using Particle Swarm Optimization Technique further
reduces the THD value of source current. The values of THD in phase a, b and c
of source current are 30.18%, 31.54%, 31.74% respectively. Further it is
analyzed that by optimizing the gains of PI controller the THD values are
further reduced from 2.66% to 1.85% for firing
angle. Thus we can clearly state that optimization of PI controller using PSO
further reduces the harmonics on the source side.
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