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Series capacitive compensation on EHV transmission lines is used to

  • Series capacitive compensation on EHV transmission lines is used to Improve the stability of the system.
  • Series capacitive compensation on EHV transmission lines is primarily used to improve the voltage stability and increase the power transfer capability of the transmission line.
  • When a long EHV transmission line is heavily loaded, the line impedance increases due to the line inductance.
  • This results in a voltage drop along the line, which can cause the receiving end voltage to drop below the acceptable limits. This is known as the voltage stability problem.
  • To mitigate this problem, series capacitors are installed along the transmission line.
  • The capacitors act as reactive power sources that compensate for the inductive reactance of the line, thereby reducing the line impedance and improving the voltage profile along the line.
  • The capacitors also absorb some of the reactive power generated by the load, thereby reducing the reactive power flow in the line and increasing the real power transfer capability.