TITLE:
Sizing of STATCOM to Enhance Voltage Stability of Power Systems for Normal and Contingency Cases
AUTHORS:
Heba A. Hassan, Zeinab H. Osman, Abd El-Aziz Lasheen
KEYWORDS:
STATCOM; Voltage Stability; Contingency; Eigenvalues and Eigenvectors; Newton-Raphson Load Flow
JOURNAL NAME:
Smart Grid and Renewable Energy,
Vol.5 No.1,
January
22,
2014
ABSTRACT:
The electric
power infrastructure that has served huge loads for so long is rapidly running
up against many limitations. Out of many challenges it is to operate the power
system in secure manner so that the operation constraints
are fulfilled under both normal and contingent conditions. Smart grid
technology offers valuable techniques that can be deployed within the very near
future or which are already deployed nowadays. Flexible AC
Transmission Systems (FACTS) devices have been introduced to solve various
power system problems. In literature, most of the methods proposed for sizing
the FACTS devices only consider the normal operating conditions of power
systems. Consequently, some transmission lines are heavily loaded in
contingency case and the system voltage stability becomes a power
transfer-limiting factor. This paper presents a technique for determining the
proper rating/size of FACTS devices, namely the Static Synchronous Compensator
(STATCOM), while considering contingency cases. The paper also verifies that
the weakest bus determined by eigenvalue and eigenvectors method is the best
location for STATCOM. The rating of STATCOM is specified according to the required
reactive power needed to improve voltage stability under normal and contingency
cases. Two case system studies are investigated: a simple 5-bus system and the
IEEE 14-bus system. The obtained results verify that the rating of STATCOM can
be determined according to the worst contingency case, and through proper
control it can still be effective for normal and other contingency cases.