Effectiveness of the robust PSS design

The paper discusses robust PSS synthesis. The PSS is an H
_∞
controller, what means that minimises H
_∞
norm of transfer function between the exogenous signals such as reference inputs and disturbances, and the error signals which are to be minimised to meet the control objective. The dynamic properties of the plant are shaped by choosing appropriate weighting function applied to the plant output and input signals. Question appears: does such type of PSS design lead to effective PSS which can be applied in real power system?