27-06-2012, 01:48 PM
Adaptive Backstepping Sliding Mode Control of Static Var Compensator
d Adaptive Backstepping Sliding Mode Control of Static Var Compensator 2011.pdf (Size: 1.77 MB / Downloads: 37)
INTRODUCTION
IT is well known that the stability margins of the power
system will decrease, as the electrical power transmission
levels increase. Increased loading of power systems, environmental
restrictions, and combined with a world wide deregulation
of the power industry, require more effective and efficient
control means for stability control. The design of an advanced
control system to enhance the power system stability margin
and achieve higher transfer limits is one of the major problems
in power systems.
With the development of power electronics technology,
flexible alternate current transmission system (FACTS) devices
have been widely employed in power systems and provide very
good controllability to improve global system dynamics. Static
var compensator (SVC) is a kind of FACTS device, which
has been employed in power systems to regulate the system
voltage and improve power system stability [1]–[4]. SVC
has many advantages over traditional reactive power system
compensators. Therefore, various control techniques have been
used to develop SVC controllers [5]–[9].
CONCLUSION
We have applied modified adaptive backstepping sliding
mode method to design an adaptive backstepping sliding mode
controller for static var compensator. Since the controller
design is based on the nonlinear model of the plant dynamics
without linearization, the essentialities of the nonlinear nature
of power system dynamics are well preserved. The controller
does guarantee the system states remain strictly bounded in
the closed-loop due to the fact that both internal and external
disturbances are taken together into consideration in the control
synthesis problem. Hence, practical stability operation is always
guaranteed. Due to the fact that the system output is also
accounted for in the control design, the disturbance effects on
the output remain well attenuated too.