A Novel Approach to Determine Static Voltage Stability Limit and Its Improvement Using TCSC and SVC

Determination of the steady state voltage stability is essential in power system operation and planning. Conventional method of finding the maximum or critical loading point (CLP), suffers from huge computational time and iteration. In this paper an adaptive neuro fuzzy inference system (ANFIS) is used to control the step length of a conventional continuation power flow (CPF) method in determining CLP and nose curves (PV – curves). Modal analysis technique is adopted to identify the vulnerable load buses and critical branches of a power system, for the effective placement of FACTS devices. Static VAR Compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC) are used in the identified location to enhance the static voltage stability limit of the power system. The proposed approach is successfully applied to 9 bus, New England 39 bus and IEEE 118 bus system and the results are reported.

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