ABSTRACT:
According to
importance of power quality in power network, improvement of compensator
equipment and ways of efficiency increasing can reduces destroyer effect on
network. Active power filters as more importance and finance in network and
industrial has depended detector algorithm and switching technique. This paper
presents a novel algorithm (STF-PQ). This algorithm base on harmonic extract is
divided into two parts as feedback loop and feed forward loop. Then, the
hysteresis current control has been used to produce the switching pattern. A
comparison between PWM and hysteresis current control has been performed that
shows the efficiency and simplicity of hysteresis current control. Simulation
of this filter has been done in Matlab/Simulink to prove the good performance
of STF-PQ and hysteresis current control in hybrid filters.
KEYWORDS:
1.
Hybrid active power filters
2.
Self tuning filter
3.
Hystrsis current control
4.
Matlab/Simulink
SOFTWARE:
MATLAB/SIMULINK
Fig.2
simulation Results
CONCLUSION:
According to development of power
systems in industrial such as UPS, speed control of electrical machine,
electrical furnace, computers and non-linear load that cause increasing of
harmonic in network, Undesirable effect of harmonic is one of power transfer problem.
This is why of standard codifying on THD limitation. Thus, it is necessary to
detect and remove it until under permit limit. In this paper a novel algorithm
of "STF-PQ" has been proposed to detect harmonics in power system.
Then hysteresis current control has been used to make the reference current due
to its simplicity and high accuracy. The comparison between PWM and hysteresis
proves that use of PWM has more complexity and calculation to generate pulses.
Simulation results show the efficiency of this power filter in harmonic elimination.
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1, pp. 642- 648 (1999)
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