Analysis of series and shunt line compensation by a unified power flow controller

A novel method for the analysis of the effectiveness of a UPFC for transient stability enhancement is presented. The analysis shows that the maximum power transfer, P_{e max} for line compensation by the UPFC can be written in the general form of P_{e max}=P_max/(1-k₁-k₂) where P_max is the maximum power transfer for the uncompensated line, and k₁ and k₂ are the degrees of compensation offered by the series and shunt branches of the UPFC, respectively.