Informatics Publishing Limited

Senthil Kumar N. ¹

Affiliations
1 School of Electrical Engineering, VIT University, Chennai-600 127, IN

Abstract

The availability of flexible A.C. transmission system (FACTs) devices such as Static Var compensators (SVCs) and Static Compensators (STATCOMs), has led their use to control reactive power flows in transmission lines and system bus voltage. In addition to voltage control these devices can also be used effectively for improving the small signal stability of the power system and improve system damping. The objective of this paper is to explore the impact of the shunt connected FACTS devices namely Static Var Compensator (SVC) and Static Compensator (STATCOM), on the small signal stability of a single machine infinite bus system. A single machine infinite bus system is chosen to analyze the damping capabilities in a detailed manner.

Keywords

Small Signal Stability, SVC, STATCOM, Damping Controller, Transient Stability

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Senthil Kumar N. ¹

Affiliations
1 Associate Professor, School of Electrical Engineering, VIT University, Chennai - 600 127, India, IN

Abstract

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.

Keywords

Small Signal Stability, Effective Location of SVC, Controllability and Observability Residues.

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