ABSTRACT:
The paper presents the structure of an active parallel
filter for reducing harmonic pollution and reactive power. The active power
filter control is based on instantaneous reactive power theory. The authors
present the modelling of parallel active filter based on this theory and the
simulation results in MATLAB-SIMULINK. The method is based on instantaneous
reactive power (TPRI_P).
KEYWORDS:
1.
Distorting
regime
2.
Harmonic
pollution
3.
Power
active filter
4.
Reactive
power
5.
Simulation.
SOFTWARE: MATLAB/SIMULINK
BLOCK DIAGRAM:
Figure
1. Parallel active filter
EXPECTED SIMULATION RESULTS:
Figure 2. The unfiltered current and the
current filtered on phase “a”
Figure 3. The active and reactive powers
Figure 4. Current harmonics with
three-phase load
Figure
5. Current harmonics with both loads
CONCLUSION
We considered three-phase system with
the balanced voltages and presented the conventional method for determining the
current value based on the instantaneous active power which was called TPRI_P. The
control is made in the system of axes α - β, which use direct and inverse transformation
to obtain the equations from one system to another coordinate axes. The
currents obtained in the α-β are related to the alternating current power on
the network to obtain the compensation current based on current knowledge of
the load, in contrast to the conventional method (TPRI_Q) to obtain the
controlled values of currents directly. As can be seen in calculations involved
only active powers, perfectly measurable.
Also is observed that:
• It produces an increase of the current
THD network in the case of the system constant
instantaneous power of the energy source.
• Is observed a small fluctuation by
active power and reactive power of network in the system
constant
instantaneous power of the energy source.
• Regarding the homopolar power, network
evolution is similar in both cases.
REFERENCES
[1]
*
* Software Matlab 6.5.
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Proceedings, Vol. Energy and clean technologies, Albena Co., Bulgaria , 2013,
153 - 160.
[3]
Akagi
H., Kanazawa Y., Nabae A., Instantaneous
reactive power compensators comprising switching devices without energy storage
components, IEEE Transactions on Industry Applications, Vol. IA-20, No.
1, May/June 1984, 625-630.
[4]
Akagi
H., Kim H., The theory of
instantaneous power in three-phase four-wire systems: A comprehensive approach,
Conf. Rec. IEEE-IAS Annu. Meeting, 1999, 431-439.
[5]
Popescu,
F.G., Arad, S, Marcu, M., Pana, L. Reducing
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lignite, Papers SGEM2013/Conference Proceedings, Vol.[1]Energy
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