ABSTRACT:
This paper, presents three phase shunt
active filter under distorted voltage condition, the active power filter
control is based on the use of self-tuning filter (STF) for reference current
generation and on space vector PWM for generation of pulses. The dc capacitor
voltage is controlled by a classical PI controller. The diode rectifier feed RL
load is taken as a nonlinear load. The self-tuning filter allows extracting
directly the voltage and current fundamental components in the axis without
phase locked loop (PLL) under distorted voltage condition. The experiment
analysis is made based on working under distorted voltage condition, and the
total harmonic distortion of source current after compensation .Self tuning
filter based extraction technique is good under distorted voltage conditions.
The total harmonic distortion (THD) of source current is fully reduced. The
effectiveness of the method is theoretically studied and verified by
experimentation.
KEYWORDS:
1.
active power filters,
2.
dSPACE1104,
3.
real time
4.
STF
5.
SVM
SOFTWARE:
MATLAB/SIMULINK
Figure
1. Active Power Filter
Figure
2. The source voltage
Figure 3. The load current
Figure 4. Source current
Figure 5. Filter current and its
reference
Figure 6. The DC voltage
Figure 7. Load current's harmonic
spectrum
Figure 8. Source current's harmonic
spectrum
CONCLUSION:
A modified pq theory control technique
applied to a three-phase Shunt Power Filter is proposed. The appropriate
control strategy for removing harmonics caused by non-linear loads is
developed. The main advantage of the proposed method is its simplicity (no PLL
circuit needed) and its efficiency in non-ideal voltage condition. The use of
SVPWM method allows to the inverter to fellow its reference accurately which
increase the performance of the active filter. The experiment results show the
efficiency of the proposed method in terms of harmonic reduction as shown in
Figure12, the THD obtained by the new control technique has been drastically reduced.
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