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CHAPTER 7
CONCLUSION AND FUTURE SCOPE
7.1 CONCLUSION
In this research work, the design and evaluation of the robustness of
power quality solutions are carried out using the PV-UPQC system. The
installation of PV-UPQC system at the distribution system ensures the
capability of enhancing the improvement in power quality.
The proposed PV-UPQC system is simulated using
MatLab/Simulink software. Based on the analysis of the simulation results,
the conclusions of this research work are as follows.
Customized power offers the customer no interruptions, tight
voltage regulation, low harmonic voltages and tolerance to
fluctuating and non-linear loads without affecting the terminal
voltage.
It has been shown that custom power devices provide higher
performance in comparison to traditional compensation techniques.
However, the choice of the most suitable solution depends on the
characteristic of the supply at the PCC, the requirements of the load,
economic aspects and the customer value added by the installation
of power electronic based devices.
In the proposed PV-UPQC power circuit, control strategies of the
system are modeled in detail. Consequently, this model provides
efficient guidelines to deal with robust compensation techniques of
sag and swell and for obtaining steady- state waveforms.
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Due to simple and fast response characteristics of the hysteresis
control, the proposed hysteresis method provides reactive power
compensation and the reduction of the current harmonics.
When the PV-UPQC is connected to a weak supply point, the
voltage becomes unacceptably distorted due to the switching
frequencies in the supply current. LC filters are used for interfacing
the shunt VSI with the distribution network for minimizing the
switching frequencies generated by the shunt inverter entering into
the grid.
The results are analyzed with combined operation of PV and UPQC,
which can compensate long voltage interruption and inject the active
power to the load.
The PV-UPQC system is highly suitable for compensating the power
quality problems. It can be connected to distribution systems and is capable
of generating real and reactive power at PCC. The simulation results show
that the proposed PV-UPQC compensation of the sag, swell, harmonics
and long voltage interruption is better than the other existing methods
implemented by various researchers. As compared to artificial neural
network and fuzzy logic controllers of other authors, the proposed control
system provides better voltage regulation. The PV-UPQC system approach
is found to be efficient and it provides robust power quality improvement
in power distribution systems.
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7.2 FUTURE SCOPE
During the course of this research, the following issues have been
identified for the future work.
The research work can be extendable for the use of wind energy.
The control techniques can be enhanced to design different control
schemes.
The proposed scheme can be used with battery-based system even in
the absence of solar energy during night times and cloudy days.