Effective Location of SVC Controller for Small Signal Stability Enhancement in Multi Machine Power Systems

The problem of small signal stability is usually due to insufficient damping of system oscillations. The power electronic based FACTS devices are effective for system voltage control and power fl ow control. This paper presents a systematic method of developing the small signal model for stability enhancement in a power system using SVC. While the primary purpose of a Static Var Compensator (SVC) is to regulate bus voltage, it can also improve stability and damping of a power system if located appropriately. This paper proposes a Residue factor to fi nd the location of SVC in multi-machine system. The proposed residue factor was based on the relative participation of the parameters of SVC controller to the critical oscillatory mode. The algorithmic steps for computing the residue factor is proposed, which combined the linearized differential algebraic equation (DAE) model of the power system and the SVC output equations. The effectiveness of the proposed method was demonstrated on the standard WSCC 3 Machine 9-Bus system. All computations were carried out using MATLAB^TM v7.6.