ASSESSMENT OF TRANSIENT STABILITY ENHANCEMENT CAPABILITY OF UNIFIED POWER FLOW CONTROLLER IN A MULTI-MACHINE POWER SYSTEM
ASSESSMENT OF TRANSIENT STABILITY ENHANCEMENT CAPABILITY OF UNIFIED POWER FLOW CONTROLLER IN A MULTI-MACHINE POWER SYSTEM
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Date
2014-08
Authors
SANNI, Shereefdeen Oladapo
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Abstract
The study of the transient stability enhancement capability of Unified power flow
controller (UPFC) in a multi-machine power system is presented. The test system was
Nigerian 330kV power system and the focus was on the effect of disturbances on the
largest generating unit (Egbin) in the system. The original network was reduced to
retain the area of interest (i.e. South West buses including Egbin generator). The UPFC
was connected between Egbin and Ikeja-west buses and the analysis was conducted by
simulating a 3-phase fault at three locations; on the terminal of the largest generator
unit at Egbin bus, the bus with the largest load at Ikeja–west and the bus at Benin. The
response of the system for the three cases with and without the device in operation was
observed. The dynamic model for the series part of the device was developed in Python
programme using the application program interface (API) in Power System Simulation
for Engineering (PSS/E) software used for the analysis. Simulation results showed that,
with the UPFC in the network, the steady state voltage profiles of some buses were
improved by as much as 4.9% especially those close to the point of connection. In
addition, the device was able to damp power oscillation and the system transient
stability was enhanced. The enhancement is from the critical clearing time of the
system which was increased from 380ms to 590ms when the fault was at Egbin
generator terminal, from 470ms to 510ms following the fault at Ikeja-west, and from
770ms to 830ms when the fault was at Benin bus.
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ASSESSMENT OF TRANSIENT STABILITY ENHANCEMENT CAPABILITY OF UNIFIED POWER FLOW CONTROLLER, MULTI-MACHINE POWER SYSTEM