0 ratings0% found this document useful (0 votes) 454 views12 pagesObjectives of Shunt Compensation
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OBJECTIVES OF SHUNT COMPENSATION
© Steady-state transmittable power can be increased.
© Voltage profile can be controlled.
© Shunt connected reactors (fixed or mechanically
switched) are applied to minimize line over voltage
under light load conditions.
o Shunt connected capacitors are applied to maintain
voltage levels under heavy load conditions. MIDPOINT REGULATION FOR LINE
SEGMENTATION
o Consider two bus transmission model with ideal var
compensator at the midpoint.
X12 dem Ime X/2
— >
© The compensator divides line into 2 parts. MIDPOINT REGULATION FOR LINE
SEGMENTATION
© Midpoint var compensator exchange only reactive
power with the line.
o Real power is same at each terminal
6 4V 8
Vin = Vie = Veos 33 Ton = Ine = = Se 8i MIDPOINT REGULATION FOR LINE
SEGMENTATION
o The transmitted power is
P= Vonbin = Vardar = Verto cos$ = Vr eos $
o The relation between P,Q and angle 6
ave.
2 Panay to---5 7 Pp= x in 6/2
2
= sind MIDPOINT REGULATION FOR LINE
SEGMENTATION
© Midpoint shunt compensation significantly increase
the transmittable power.
© Mid point of the transmission line is the best
location for the compensator.
o Voltage sag is maximum at the mid point. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
© Consider a radial Transmission line END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
o Reactive shunt compensation can effectively
increase the voltage stability limit and regulates the
terminal voltage.
o End of the line is the best location for compensator. IMPROVEMENT OF TRANSIENT STABILITY
a (pre-fault)
¢ (post-fault)
O 84 6p wI2 bg bqy 0 TB IMPROVEMENT OF TRANSIENT STABILITY IMPROVEMENT OF TRANSIENT STABILITY
P
2P ax ov?
Po= “X, sin 6/2
Abmargin
P.
5 550 553 6
ot %p2 %3 Derit = 7 6 POWER OSCILLATION DAMPING
Ph
(b) p
af Undamped
(a) 5 Damped
\__~__"_"___,
t
Undamped
Damped
Pig
