Synthesis of sensitivity coefficients for controller parameters of static var compensator

Traditionally, a lead/lag circuit is regarded as providing phase compensati on for a controller, so a few lead/lag, stages would be needed to achieve s ufficient phase shifts at the frequency of concern, A different viewpoint i s offered as a basis of the SVC damping controller design. From time consta nt synthesis, three different objectives of a properly designed lead/lag ci rcuit are highlighted, but the dominant one is associated with gain compens ation, rather than phase compensation. Moreover, the required number of sta ges, the choice of lead or lag compensation, and the selection of the time setting ranges are all indicated from the synthesis.