1. STATIC SHUNT COMPENSATION
Presented by
T.S.L.V.Ayyarao
1

2. 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.
 Shunt connected capacitors are applied to maintain
voltage levels under heavy load conditions.
2

3. MIDPOINT REGULATION FOR LINE
SEGMENTATION
 Consider two bus transmission model with ideal var
compensator at the midpoint.
 The compensator divides line into 2 parts.
3

4. MIDPOINT REGULATION FOR LINE
SEGMENTATION
 Midpoint var compensator exchange only reactive
power with the line.
 Real power is same at each terminal
4

5. MIDPOINT REGULATION FOR LINE
SEGMENTATION
 The transmitted power is
 The relation between P, Q and angle
5

6. 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.
 Voltage sag is maximum at the mid point.
6

7. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
 Consider a radial Transmission line
7

8. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
8