Abstract:
Due to the competition in the existing
electrical market, it isvery necessary to enhance the
transmission performance of the power system
through the existing transmission lines also Reactive
Power flow control is a major concern in the
operation and manage of power systems.The FACTS
devices have been designed as excellent controllers in
a power system for superior reliability and
transmission capacity on a long-term and economical
basis. This Paper describes a unified power flow
controller (UPFC) model developed for performing
system reasonableresearch.In the condition of any
fault , the voltage at the Point of Common Coupling
(PCC) decrease under eighthy percent instantly and
the rotor speed of induction generators ends up
noticbly unstable. This paper the low voltage ride-
through (LVRT) of wind energy conversion system
(WECS) isenhanced by the application of an UPFC
and further at the time of fault to damp out the rotor
speed oscillations of induction generator.The wind
turbine has a noteworthy issuerelated with it which is
high variation in volatge of the grid amid power
gerenrationwith, an increase of large wind farms. The
wind turbine’s performance normally worsen during
voltage variations, which could be either over voltage
or voltage drops. Over voltage, withstanding capacity
of the wind turbine is typically known as High Voltage
Ride Through (HVRT) and on the other hand, the
capability of wind turbines amid voltage drops is
known as Low Voltage Ride Through (LVRT). The
issues because of sudden over-voltage and voltage
plunges are typically related with the power electronic
converters fed wind turbines and are being affected by
the poor grid situations. The simulation results
demonstrates that UPFC can enhance the LVRT of
DFIG-based WECS and hence maintain wind turbine
connection to the grid during certain levels of voltage
variation at the grid side.
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