ABSTRACT:
In this paper the 5-level Packed U-Cell (PUC5) inverter
is reconfigured with two identical DC links operating as an active power filter
(APF). Generally, the peak voltage of an APF should be greater than the AC
voltage at the point of common coupling (PCC) to ensure boost operation of the
converter in order to inject harmonic current into the system effectively;
therefore, full compensation can be obtained. The proposed modified PUC5 (MPUC5)
converter has two equally regulated separated DC links, which can operate at no
load condition useful for APF application. Those divided DC terminals
amplitudes are added at the input of the MPUC5 converter to generate a boosted
voltage that is higher than the PCC voltage. Consequently, the reduced DC links
voltages are achieved since they do not individually need to be higher than the
PCC voltage due to the mentioned fact that their summation has to be higher
than PCC voltage. The voltage balancing unit is integrated into modulation
technique to be decoupled from the APF controller. The proposed APF is practically
tested to validate its good dynamic performance in harmonic elimination, AC
side power factor correction, reactive power compensation and power quality
improvement.
KEYWORDS:
1.
Active Power
Filter
2.
PUC5
3.
Harmonic
Elimination
4.
Power Factor
Correction
5.
Power Quality
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
The
MPUC5 configuration has been introduced as a modification to the PUC5 topology
with the advantage of DC voltage boosting. It has been employed as an APF with
reduced DC link voltages. The voltage balancing between DC capacitors in the
APF has been done by the redundant switching states. Since the two capacitors
voltages are regulated without external controllers, a simple cascaded control
technique has been implemented to keep the sum of two DC voltages values at the
reference level as well as synchronizing the source current with grid voltage.
Finally, the performance of the MPUC5 APF has been tested practically. Results
have shown that the proposed configuration operated well in current harmonic
elimination, reactive power compensation and power factor correction.
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[3]
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