ABSTRACT:
In this work, a novel technique based on
second order sequence filter and proportional resonant controller is proposed
for control of universal active power filter integrated with PV array
(UAPF-PV). Using a second order sequence filter and sampling it at zero
crossing instant of the load voltage, the active component of distorted load
current is estimated, which is used to generate reference signal for shunt
active filter. The proposed method has good accuracy in extracting fundamental active
component of distorted and unbalanced load currents with reduced mathematical
computations. Along with power quality improvement, the system also generates
clean energy through the PV array system integrated to its DC-link. The UAPF-PV integrates benefits of power quality
improvement and distributed generation. The system performance is
experimentally evaluated on a prototype in the laboratory under a variety of
disturbance conditions such as PCC voltage fall/rise, load unbalancing and variation
in solar irradiation.
KEYWORDS:
1. Power quality
2. Universal active power filter
3. Adaptive filtering
4. Photovoltaic array
5. Maximum power point tracking
6. Sequence filter
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.1.
System configuration of UAPF-PV System
EXPERIMENTAL RESULTS:
Fig.
2. Simulated Performance of UAPF-PV under Sags and Swells in
Voltages
at the PCC
Fig.
3. Simulated Performance of UAPF-PV System under load unbalance
Condition
Fig.
4. Simulated Performance of UAPF-PV System under irradiation
Variation
(a) Harmonic Spectra and THD of Grid
Current (b)
Harmonic Spectra and THD of
Load Current
Fig.
5. Steady State Performance of UAPF-PV System
CONCLUSION:
The performance of a novel control
technique for solar PV system with universal active filtering, has been
evaluated. The fundamental positive sequence components of nonlinear load currents
are extracted using a second order sequence filter along with a zero cross
detection technique. The series active filter is controlled using a
proportional resonant controller implemented in α − β domain along with
feedforward component. The system performs satisfactorily under disturbances such
as PCC voltage dip/rise, changes in solar radiation and load disturbances.
Apart from improving power quality, the system also supplies power from a PV
array into the grid. A comparison of the proposed control shows that the system
has improved performance as compared to conventional control techniques with
low computational burden. The system integrates distributed generation along
with enhancing power quality of distribution system.
REFERENCES:
[1] S. J. Pinto, G. Panda, and R.
Peesapati, “An implementation of hybrid control strategy for distributed
generation system interface using Xilinx system generator,” IEEE
Transactions on Industrial Informatics, vol. 13, no. 5, pp. 2735–2745, Oct
2017.
[2] B. Singh, A. Chandra, K. A. Haddad, Power
Quality: Problems and Mitigation Techniques. London: Wiley, 2015.
[3] S. Singh, B. Singh, G. Bhuvaneswari,
and V. Bist, “A power quality improved bridgeless converter-based computer
power supply,” IEEE Transactions on Industry Applications, vol. 52, no.
5, pp. 4385–4394, Sept 2016.
[4] M. Peterson and B. N. Singh,
“Multipulse controlled ac-dc converters for harmonic mitigation and reactive
power management,” IET Power Electronics, vol. 2, no. 4, pp. 443–455,
July 2009.
[5] B. Singh, M. Kandpal, and I.
Hussain, “Control of grid tied smart pv dstatcom system using an adaptive
technique,” IEEE Transactions on Smart Grid, vol. 9, no. 5, pp.
3986–3993, Sept 2018.
