RESEARCH ON INTERACTION AMONG TCSC CONTROLLERS IN MULTI-MACHINE POWER SYSTEM

An augmented Phillips-Heffron model for multi-machine power system with multi-TCSC installed is built up. Based on this model a practical example, i.e., in a 4-machine 11-bus testing system when two TCSC controllers are jointly operated the interaction of TCSC exists, is given. It is also pointed out that there is the possibility of existing negative interaction among multi-TCSC controllers located at a same area of a multi-machine power system, so this factor should be taken into account during the design of TCSC in order to ensure the coordinative operation of multi-FACTS controllers in a same power grid.