Conference Program of WCICA 2012

Conference Program WCICA 2012
Wang, Ping
Liang, Fujun
Qi, Shengbiao
Tianjin Univ.
Tianjin Univ.
Tianjin Univ.
When grid occurs short circuit fault and voltage drops, because of coupling
relationships between stator and rotor windings of doubly-fed generator,
over-current is generated in stator and rotor windings. At the
same time, power that grid-side converter absorbs from the grid is out of
balance from the power that rotor-side converter outputs, which makes
redundant energy accumulated in DC-link and leads to over-voltage
and under-voltage produced. Over-current may damage rotor-side converter
and makes wind turbine detach from grids, and DC-link capacitance
will be break down for the over-voltage. Therefore, it is necessary
to adopt protection circuit to realize the low voltage ride through of D-
FIG system .In this paper, based on the established simulation model
of DFIG, combination protection circuit composed of rotor-side Crowbar
and DC-link protection circuit and it’s control strategy are researched
during voltage drops for three symmetric short circuit fault of DFIG system,
and simulated through Matlab/simulink software.
◁ PFrC-68
Finite-Time Stabilization for a Class of Distributed Parameter Systems,
pp.1948–1952
FU, Qin
Univ. of Sci. & Tech. of Suzhou
The concept of finite-time stability and stabilization for distributed parameter
systems is introduced by the definition of finite-time stability for
linear systems.The design of state feedback controllers and dynamic
output feedback controllers is given for a class of distributed parameter
systems.A sufficient condition is provided by using linear matrix inequality(LMI).
When the feedback control laws are applied to the systems,the
closed-loop systems are finite-time stable.
◁ PFrC-69
On initial alignment of large azimuth misalignment for SINS on the static
base in Krein space, pp.1964–1968
FENG, JIN
YU, FEI
ZHANG, PENG-Yu
Zou, Meikui
Harbin Engineering Univ.
Harbin Engineering Univ.
Harbin Engineering Univ.
Harbin Engineering Univ.
The error equation for the azimuth misalignment angle for SINS on the
static base is nonlinear, and it’s an urgent problem to align it when the
angle is large. This paper proposes a method for the initial alignment
of large azimuth misalignment based on Krein space linear estimation.
The sum quadratic constraint (SQC) for nonlinear system is obtained
by using Lipschitz condition of nonlinearity. Thus proposed Krein space
approach is used to tackle the estimation problem for a class of nonlinear
cases. Using kalman filterof krein space robust properties, we
establish a nonlinear measurement error equation in Krein space, and
give a recursive formula for the measurement error estimation. The
initial alignment of large azimuth misalignment is simulated Finally, a
numerical example is given to demonstrate the effectiveness of the
proposed approach.By the Kalman filter method in Krein space which
shows that the result generated by the Kalman frlter method in Krein
space has effective and superior.
◁ PFrC-70
Research on QFT Controller Design for LOS Stabilization System of
Opto-electronic Load for UAV, pp.1982–1986
Xu, Dexin
Harbin Engineering Univ.
HE, Kunpeng
harbin engineering Univ.
Wei, Yanhui
harbin engineering Univ.
Zhao, Jiangpeng Troops 92854
In order to decrease affection of parameters uncertainty of line-of-sight
stabilization system of opto-electronic load for UAV, quantitative feedback
theory design method is adopted on the servo controller of line-ofsight
stabilization system of opto-electronic load for UAV. The simulation
result indicates that the performance of QFT controller is better than
the traditional controller. QFT method can deal with the special problem
effectively since parameters uncertainty probably decrease control
performance, it has strong robustness and can solve the controller design
problem with parameters uncertainty of line-of-sight stabilization
system of opto-electronic load for UAV.
◁ PFrC-71
Chaos Phenomenon in the DC-DC Switching Converters, pp.2039–
2043
Zhang, Yumei
Qin, Hong
Qu, Yanhua
Wu, Jianhua
Shenyang Inst. of Engineering
Shenyang Inst. of Engineering
Shenyang Inst. of Engineering
Northeastern Univ.
DC-DC switching converter is an important part of power electronics,
belonging to strong nonlinear time-varying systems. In the course
of their traditional research, which rarely involves the study of nonlinear
phenomena. However, During switching converter is working state,
it can produce a transient pulse containing high frequency harmonics
that can emit electromagnetic interference, electromagnetic interference
can cause pollution to the network and direct impact to other electrical
appliances to work by conduction, radiation, all these phenomena
indicates that the existence of chaos. Because chaos is a state as a
result of instability, the uncertainty will lead the operation of the system
to phenomena like Random, which affect the control performance of
converter, even lead to not working, the study of chaos in the switching
converter and its control methods which have important guiding significance
in the correct designing and debugging switching converter will
help us to avoid or eliminate this phenomenon in the design, so that the
converter works in a stable cycle.
◁ PFrC-72
Adaptive Integral-Type Sliding Mode Control for a Class of Uncertain
Nonlinear Systems, pp.2081–2084
Sun, Li-Ying
Liaoning Univ. of Tech.
An integral-type sliding mode control method for a class of uncertain
nonlinear systems in parameter feedback form is developed. The design
procedure can be divided into two steps. Firstly, design a nonlinear
integral-type sliding manifold for the uncertain system such that not only
the sliding motion can occur on that manifold, but also the system’
s motion along the manifold is asymptotically stable. The integral-type
sliding surface is constructed by adding an integral term into the linear
sliding surface. The additional integral in the proposed sliding surface
provides one more degree of freedom; Secondly, based on the Lyapunov
stability theorem, design a control law, such that the system’s
states are driven towards the manifold and stay there for all future time,
regardless of uncertainties.
◁ PFrC-73
Exponential Synchronization of a Class of Chaotic Neural Network,
pp.2194–2197
Qiao, Zongmin
Zhang, Pei
Hefei Normal Univ.
anhui Univ.
Synchronization of chaotic system has become an important area of
study. A chaotic system is a nonlinear deterministic system that possesses
complex and unpredictable behaviour. Based on nonlinear state
coupling, this paper derived a delay independent sufficient exponential
synchronization condition based on the Lyapunov stability method and
the Halanay inequality lemma. The proposed condition is less conservative
than previously established ones in the literature.
◁ PFrC-74
Adaptive Observer Design for a Class of MIMO Nonlinear Systems,
pp.2198–2203
ZHAO, Lili
Li, Ping
LI, Xiuliang
Zhejiang Univ.
Zhejiang Univ.
Zhejiang Univ.
For a class of uniformly observable nonlinear multi-input-multi-output
(MIMO) systems with unknown parameters in both state and output e-
quations, an adaptive observer is designed in a constructive manner
based on the techniques of high gain observer and adaptive estimation.
The high gain adaptive observer for joint state and unknown pa-
144