Wide-area TCSC controller design in consideration of feedback signals´ time delays

The recent advances in wide-area measurement system (WMAS) is driving power systems to the trend of wide-area monitoring and control. In this trend, the impact of time delays introduced by remote signal transmission and processing in WAMS has to be considered. This paper investigates the wide-area controller design problem of power system in the presence of output feedback delays in WAMS. Firstly, a simple example demonstrates the negative effects of feedback signals´ time delays of WAMS on the dynamic performances of thyristor controlled series compensator (TCSC). In order to eliminate the negative effects of time delays, a novel approach based on linear matrix inequality (LMI) technique and Hankel model order-reduced algorithms is proposed to design an effective TCSC controller. Two cases, a single-machine-infinite-bus power system and New England test power system (NETPS), verify that the derived TCSC controllers can stabilize the systems for various time delays.