Design and Real Time Implementation of Robust FACTS Controller for damping Inter-area Oscillations
Speaker: Rajat Majumder, Imperial College, London, UK
When: 2005-10-31 09:00:00
Venue: 78-420
Host: Prof Tapan Kumar Saha
Abstract:Low frequency electromechanical oscillations (0.2 -1.0 Hz),
involving groups of synchronous machines situated in different
geographical regions, are inherent in interconnected power
systems. These oscillations commonly referred to as inter-area
oscillations. In order to maximize the efficiency of generation,
transmission and distribution of electric power, the
inter-connection between individual utilities have increased and the
generators have been required to operate at maximum limits for
extensive period of time. In addition, the most economic sites for
generating plants are often remote from load centres and power must
be transmitted over a long distances. With ever increasing stress on
the existing transmission lines the use FACTS for power flow control
and dynamic voltage support is rapidly gaining momentum. In a
practical power system, the number of swing modes is often larger
than the number of devices (e.g. FACTS, PSSs) available at
appropriate locations to control them. The conventional damping
control design approach considers a single operating condition of
the system. The controllers obtained through these approaches are
simple but tend to lack robustness. To address this issue in this
work, the use of multi-variable control design technique
(centralized) for damping multiple swing modes using a single FACTS
device is studied which essentially asks for feedback signals to be
transmitted from remote measurement locations to the controller
site. For both technical as well as economic reasons, it is thus
desirable to have a dynamic system emulator, which can physically
emulate the behavior of the power system in real time. As a part of
this work, such an emulated power system has been built using a real
time simulation platform (Opal-RT). The control algorithm has been
programmed on a rapid prototyping controller. It has been ensured
that the hardware interface between the two platforms (emulated
system and rapid prototyping controller) is in analogue domain so
that it is virtually impossible for the controller to distinguish
between the actual plant and the emulated plant. The costly
proposition of building a prototype power system in the laboratory
for testing purpose has thus been avoided.
Biography:Rajat Majumder received his BEE (Hons) from Jadavpur University,
Kolkata, India and M.Sc (Engg) from Indian Institute of Science,
Bangalore, India in 2000 and 2003 respectively. He is currently
working for his PhD in the Control & Power Research Group at
Imperial College London, London UK. His research interests include
power system stability, robust control strategy and real time
dynamic prototyping of power systems.
Type: ITEE Seminar
Contact:Prof Tapan Kumar Saha, seminar host (saha@itee.uq.edu.au)
or Guido Governatori (ITEE seminar co-ordinator)
(guido@itee.uq.edu.au)