ABSTRACT:
This
paper deals with the design and performance analysis of a three-phase single
stage solar photovoltaic integrated unified power quality conditioner
(PV-UPQC). The PV-UPQC consists of a shunt and series connected voltage compensators
connected back to back with common DC-link.The shunt compensator performs the
dual function of extracting power from PV array apart from compensating for
load current harmonics. An improved synchronous reference frame control based
on moving average filter is used for extraction of load active current
component for improved performance of the PVUPQC. The series compensator
compensates for the grid side power quality problems such as grid voltage
sags/swells. The compensator injects voltage in-phase/out of phase with point
of common coupling (PCC) voltage during sag and swell conditions respectively.
The proposed system combines both the benefits of clean energy generation along
with improving power quality. The steady state and dynamic performance of the
system are evaluated by simulating in Matlab-Simulink under a nonlinear load.
The system performance is then verified using a scaled down laboratory
prototype under a number of disturbances such as load unbalancing, PCC voltage
sags/swells and irradiation variation.
KEYWORDS:
1. Power
Quality
2. Shunt
compensator
3. Series compensator
4.
UPQC
5.
Solar PV
6.
MPPT
SOFTWARE: MATLAB/SIMULINK
CIRCUIT DIAGRAM:
Fig.
1. System Configuration PV-UPQC
EXPECTED SIMULATION RESULTS:
Fig.
2. Performance of PV-UPQC under Voltage Sag and Swell Conditions
Fig.
3. Performance PV-UPQC during Load Unbalance Condition
Fig.
4. Performance PV-UPQC at Varying Irradiation Condition
Fig.
5. Load Current Harmonic Spectrum and THD
Fig.
6. Grid Current Harmonic Spectrum and THD
CONCLUSION:
The
design and dynamic performance of three-phase PVUPQC have been analyzed under
conditions of variable irradiation and grid voltage sags/swells. The
performance of the system has been validated through experimentation on scaled
down laboratory prototype. It is observed that PVUPQC mitigates the harmonics
caused by nonlinear load and maintains the THD of grid current under limits of
IEEE-519 standard. The system is found to be stable under variation of irradiation,
voltage sags/swell and load unbalance. The performance of d-q control
particularly in load unbalanced condition has been improved through the use of
moving average filter. It can be seen that PV-UPQC is a good solution for
modern distribution system by integrating distributed generation with power
quality improvement.
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