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# Objectives of shunt compensation

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### Objectives of shunt compensation

1. 1. STATIC SHUNT COMPENSATIONPresented byT.S.L.V.Ayyarao1
2. 2. OBJECTIVES OF SHUNT COMPENSATION Steady-state transmittable power can be increased. Voltage profile can be controlled. Shunt connected reactors (fixed or mechanicallyswitched) are applied to minimize line over voltageunder light load conditions. Shunt connected capacitors are applied to maintainvoltage levels under heavy load conditions.2
3. 3. MIDPOINT REGULATION FOR LINESEGMENTATION Consider two bus transmission model with ideal varcompensator at the midpoint. The compensator divides line into 2 parts.3
4. 4. MIDPOINT REGULATION FOR LINESEGMENTATION Midpoint var compensator exchange only reactivepower with the line. Real power is same at each terminal4
5. 5. MIDPOINT REGULATION FOR LINESEGMENTATION The transmitted power is The relation between P, Q and angle5
6. 6. MIDPOINT REGULATION FOR LINESEGMENTATION Midpoint shunt compensation significantly increasethe transmittable power. Mid point of the transmission line is the bestlocation for the compensator. Voltage sag is maximum at the mid point.6
7. 7. END OF LINE VOLTAGE SUPPORT TO PREVENTVOLTAGE INSTABILITY Consider a radial Transmission line7
8. 8. END OF LINE VOLTAGE SUPPORT TO PREVENTVOLTAGE INSTABILITY8
9. 9. END OF LINE VOLTAGE SUPPORT TO PREVENTVOLTAGE INSTABILITY Reactive shunt compensation can effectivelyincrease the voltage stability limit and regulates theterminal voltage. End of the line is the best location for compensator.9
10. 10. IMPROVEMENT OF TRANSIENT STABILITY10
11. 11. IMPROVEMENT OF TRANSIENT STABILITY11
12. 12. IMPROVEMENT OF TRANSIENT STABILITY12
13. 13. POWER OSCILLATION DAMPING13