The use of relative gain array for optimal placement of PSSs

The paper investigates the possibility to use relative gain array (RGA) for optimal placement of PSSs for damping system oscillations. A multi-machine power system is used in the analysis. The effectiveness of the RGA in selecting the optimal location for placement of PSSs is compared with the conventional approach that uses residues of open loop transfer function. It is shown that RGA can be used quite effectively for this purpose.