ABSTRACT:
In this work, a methodology for implementation of an
automated transition of a solar PV array and battery integrated unified power
quality conditioner (PV-BUPQC) between standalone and grid connected modes of operation
is presented and analyzed. This system consists of a shunt and series active
filters connected back to back with a common DC-link. The system addresses the
issue of the integrating power quality improvement along with the generation of
clean energy. Moreover, due to the automated transition, the critical loads
have continuous power supply irrespective of grid availability. The key
challenges addressed are implementation of automated transition in a PV-B-UPQC
system with minimal disturbance to the local loads. The system operation is
validated through experimentation under a number of dynamic conditions such as
automated transition, supply voltage variations, unavailability of the grid,
variation in solar power generation, load variation, etc., which are typically
encountered in a modern distribution network.
KEYWORDS:
1.
Power quality
2.
Unified power
quality conditioner
3.
Solar PV
Generation
4.
Battery energy
storage
5.
Automated
transition
6.
Constant power
generation
SOFTWARE: MATLAB/SIMULINK
CONCLUSION:
The
design and performance of solar PV and battery integrated UPQC have been
presented in this work. Due to the presence of energy storage in form of
battery bank, the system operates in standalone mode of operation whenever grid
is not available thus maintaining continuity of power supply to critical loads.
Moreover, the system mitigates power fluctuations occurring in PV power
generation due to weather conditions, thus enabling smooth power generation.
This leads to increased stability of the overall system. The behavior of the system
under steay state has been found satisfactory and the PCC currents meet the
THD limits prescribed in the IEEE-519 standard.
The
response of the PV-B-UPQC has been extensively evaluated under both standalone
and grid connected modes of operation. The response of PV-B UPQC is found
satisfactory under various conditions of irradiation variation, load unbalance and
sags/swells in PCC voltage. Under all these disturbance conditions, the
PV-B-UPQC is able to feed constant power into distribution network. The system
automatically changes from the grid-tied operation to islanded operation and
vice versa with minimal disturbance to the sensitive and critical load. The
three wire PV-B-UPQC is suitable for the systems with operating with sensitive
and critical load such as in data centers, hospitals, factories where
uninterrupted power supply is of prime importance. The integration of battery
and renewable energy, enables minimum dependence on the grid for power demand
while the surplus PV power can support the grid by giving power to nearby loads
at PCC.
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