With the help of reactive compensator, it is possible to have

Reactive compensation can be done by either series compensation or shunt compensation.

Series compensation:

• It is the method of improving the system voltage by connecting a capacitor or reactor in series with the transmission line.
• In series compensation, reactive power is inserted in series with the transmission line for improving the impedance of the system.
• The following are the advantages of series capacitive compensation.
  • Increase in power transfer capability
  • Improvement in system stability
  • Load division among parallel line
  • Control of voltage

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Shunt compensation:

• Whenever an inductive load is connected to the transmission line, power factor lags because of lagging load current.
• To compensate this, a shunt capacitor is connected which draws current leading the source voltage, thereby the power factor can be improved.
• Whenever an capacitive load is connected to the transmission line, power factor leads because of leading load current.
• To compensate this, a shunt reactor is connected which draws current lagging the source voltage, thereby the power factor can be improved.

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Conclusion:

• When reactive compensation is used in series it improves the voltage of the systems.
• When reactive compensation is used in shunt it improves the power factor of the system.
• So, based on the type of the compensation, it  maintain either constant voltage or unity power factor but not both at a time.,