An approach for improvement of voltage stability condition of a power system using Combination of Power Flow Controllers

Nilakshi Deka, Durlav Hazarika

Abstract


This paper presents an approach for using Combination of Power Flow Controllers (COPFC)   to improve   voltage stability condition (VSC) of a selected bus of a multi-bus power system, which is appeared to be vulnerable to Voltage Instability Problem (VIP). Voltage Stability Index (VSI)-L [1] is used to identify the vulnerable bus of a power system as regards the VSC of the system is represented by the VSI-L of the bus. It is proposed to improve the VSI-L of the vulnerable bus by modifying power flow through a COPFC device available in a transmission line of the power system. For this purpose, sensitivity relations for change in VSI-L of the vulnerable bus and change in power flow through a COPFC device have been derived. Using these sensitivity relations, the power flow of the COPFC is modified to improve the VSC of the vulnerable bus.  IEEE 30 and IEEE 118 bus test systems are used to validate the proposed approach.

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References


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