| Abstract |
Impending deregulation of electrical energy and rising demand coupled with limitation in available
neighboring resources has forced the energy planners to transmit more power from remote resources
through existing long transmission lines. Loading of long transmission lines is limited due to voltage
and stability issues. A thoughtful engineering option to increase power transfer capability over existing
lines and to enhance voltage profile is to add the FACTS devices along the line providing voltage
support. If one such device is sited at the midpoint of the line, the electrical length of the line is halved
and power transfer can be substantially increased. STATCOM (Static Var compensator based on
power converters) can significantly contribute to the cause. In this paper we investigate benefits of the
STATCOM when installed for voltage support at mid point of long transmission line. By exploiting its
possibility of fast response, the STATCOM significantly enhances transient stability limit of the power
system, enhances voltage profile and increases maximum transferred power. In this work a detailed
numerical simulation is carried out based on HYPERSIM, a real time digital simulator and software, to
evaluate how much power transfer with respect to steady state and transient stability limits, can be
increased through long radial line when a STATCOM is sited at the midpoint of the line providing
voltage support. |
