EFFICIENCY IMPROVEMENT OF TRANSMISSION LINES WITH SIMULTANEOUS AC-DC TRANSMISSION

The power system is dependent on a stable and reliable control of active and reactive power to keep its integrity.  Loosing this command may lead to a system collapse. It is difficult to load the long extra high voltage ac lines against their thermal limits because of volatility incident in the power system. The  aim  of  this  paper  is  to  enhance  the  transient steadiness of power scheme by establishing simultaneous AC– DC  power  transmission  through  a  transmission line. With  the  scheme  suggested  in  this  paper,  it  is  more likely  to  load  these  lines  very  close  to  their  thermal limits.  The  benefit  of  simultaneous  ac-dc  transmission is  for  up  gradation  of  transient  steadiness  and  dynamic steadiness. Damp out oscillations have been established. Simulations have been done in MATLAB software package (Simulink Model).