1. STATIC SHUNT COMPENSATION
Presented by
T.S.L.V.Ayyarao
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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.
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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.
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4. MIDPOINT REGULATION FOR LINE
SEGMENTATION
 Midpoint var compensator exchange only reactive
power with the line.
 Real power is same at each terminal
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5. MIDPOINT REGULATION FOR LINE
SEGMENTATION
 The transmitted power is
 The relation between P, Q and angle
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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.
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7. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
 Consider a radial Transmission line
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8. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
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9. END OF LINE VOLTAGE SUPPORT TO PREVENT
VOLTAGE INSTABILITY
 Reactive shunt compensation can effectively
increase the voltage stability limit and regulates the
terminal voltage.
 End of the line is the best location for compensator.
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10. IMPROVEMENT OF TRANSIENT STABILITY
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11. IMPROVEMENT OF TRANSIENT STABILITY
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12. IMPROVEMENT OF TRANSIENT STABILITY
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13. POWER OSCILLATION DAMPING
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