Conference Program of WCICA 2012

WCICA 2012
Book of Abstracts: Saturday Sessions
ating, and improves the disturbance rejection capability of closed-loop
control system.
◁ PSaA-78
AC electric power steering system modeling with Feed-forward fuzzy
control algorithm, pp.3372–3377
Hu, Jianfeng
Duan, Jianming
Beijing Univ. of Tech.
Beijing Univ. of Tech.
In this paper, using the permanent magnet synchronous motor (PMSM)
as the motor of electric power steering system; establish mathematical
models of the system, the completion of the EPS system architecture
design. Adopt the composite method of Feedforward and the fuzzy PI
control track on the target current,it’s improve the speed and accuracy
response of system, reducing the tracking delay. Combine with
steering system model, two freedom degrees vehicle model designing
the power curve of control algorithm and simulating the overall system.
The results of simulation show that the design of the curved power algorithm
achieves to a good target of power control, and the system is
stability.
◁ PSaA-79
Adaptive Digitally Controlled Flyback Converter Based on Current and
Phase Margin Estimation, pp.3389–3394
Yuan, Youchen
Shao, Zhiwei
Qingdao Univ. of Sci. & Tech.
Qingdao Univ. of Sci. & Tech.
This paper introduces design and implementation of a digital controller
for an experimental low-power flyback converter in a solar-powered system
with power management. Multiple operating modes are used to
maintain high efficiency over wide range of input voltage and load. A
current, crossover frequency and phase margin estimation technique to
perform load-dependent mode switching and control system stability is
proposed and tested. An adaptive tuning digital PID regulator design
example is described, with emphasis on practical limitations imposed
by the LM3S1138 controller and the program of arithmetic due to sampling
and processing. The MIMO loop adaptively adjusts the regulator
parameters to minimize the error between the desired and estimated
crossover frequency and phase margin. Small-signal models are derived,
and the MIMO control loop is designed to achieve stability and
performance over a wide range of operating conditions. Experimental
results of demonstrating system functionality are presented for a flyback
converter.
◁ PSaA-80
Harmonic Compensation Rectifier with Smart Control Technology,
pp.3395–3400
Yuan, Youchen
Qingdao Univ. of Sci. & Tech.
A method of current harmonic suppression and voltage waveform improvement
in power supply system is introduced. The key technology
is to control the rectifier’s input current, which includes reversed components
of harmonic current, and part of them will be eliminated, while
the voltage will be drifted toward the sinusoidal waveform. Direct digital
control technique is employed in a switching power supply to control the
input current and the output voltage simultaneously based on weighted
duty cycle process. In the smart switching power supply appliance,
the reference corresponding to the output voltage is a constant value
in general, but to control input voltage, the reference voltage is in sinusoidal
waveform. Both of the input and output voltage is regulated by
the weighted duty cycle as well as the current adjustment. The input
current is changing immediately with the weighted duty cycle, but the
output current is determined by the average of the weighted duty cycle
in every half of the power period. The smart control rectifier can also
be utilized to many other power electronic applications.
◁ PSaA-81
A Vision-based Fault Diagnosis System for Heliostat in A Central Receiver
Solar Power Plant, pp.3417–3421
SONG, YANG
Huang, Wenjun
Zhejiang Univ.
Zhejiang Univ.
Zhu, Xuemei
Nanjing normal Univ.
This paper presents an automatic heliostats fault detection and diagnosis
system using machine vision techniques and common CCD devices
for a solar power plant. The heliostats of a solar power plant reflect solar
radiation onto a receiver placed at the top of a tower in order to
provide a desired energy flux distribution correlated with the coolant
flow through the receiver, usually in an open loop control configuration.
Each heliostat maintains reflection of the moving sun onto the receiver.
A long time running will make the mechanical components which
control the heliostat to modify the azimuth angle and pitch angle break
down, so the heliostats cannot reflect sunlight to the receiver or even
stop working. In a large power plant, there may be hundreds to hundreds
of thousands of heliostats which will increase the complexity of
manually recognizing and detecting which heliostat is fault or brokendown.
Each heliostat can be equipped with sensors or some other
equipment to detect whether fault occurs, but it will greatly increase the
cost. So a novel method for fault diagnosis, which is based on image
processing and machine vision, is presented in this paper. Experiments
have shown promising results.
◁ PSaA-82
Sensorless Estimation and Simulation of PMSM Based on Highfrequency
Signal Injection, pp.3438–3442
Wu, Maogang
Chen, Xing
Hangzhou Dianzi Univ.
HangZhou DianZi Univ.
The sensorless estimation principle of rotor speed and position for
PMSM by high-frequency signal injection is given. The characteristic
and filtering method of high-frequency current signal, rotor position
signal extraction based on victor transformation and heterodyning processing
method are introduced in detail. The simulation models are
made, simulation results are obtained. The efficiency is verified by simulation
results, problems need be resolved such as sample frequency
of high-frequency current, filter design and its delay, interference with
high-frequency signal from other signals, real-time compensation of rotor
position, decoupling control high-frequency signal system and base
frequency system, estimation response, and so on.
◁ PSaA-83
Adaptive Synchronization of Uncertain and Delayed Chaotic Systems
with Its Circuit Realization, pp.3465–3470
Jin, Xiao-zheng
Che, Weiwei
Wang, Dan
Shenyang Univ.
Shenyang Univ.
Shenyang Univ.
The asymptotic synchronization problem of a class of uncertain and
delayed chaotic systems is addressed with adaptive compensation designs
in this paper. General uncertainties on systems and time-delays
in the coupling network are eliminated by the adaptive control scheme,
as well as its circuit realization are proposed. Then, an approach that is
based on application of Lyapunov stability theory for the synchronization
error system with adaptive parameters is introduced to prove the
asymptotic synchronization result of the overall chaotic system. Finally,
the proposed adaptive schemes are physically implemented by circuits
and tested by simulation on a Chua’s circuit network.
◁ PSaA-84
Effect of Complex Network Structure on Synchronizability, pp.3481–
3484
Wang, Dan
Li, Yanping
Jin, Xiao-zheng
Shenyang Univ.
Shenyang Univ.
Shenyang Univ.
we introduce a evolving model that characterizes the weighted scalefree
networks with high clustering coefficient by adjusting a parameter.
The average clustering coefficient exhibits power-law decay as a
function of degree of node. Triad Formation can distinctly enhance the
clustering coefficient of networks. The effect of the evolution mechanism
on synchronizability is analyzed. The simulation results show
that synchronizability of both the type I network and the type II network
decrease as the average clustering coefficient increases in weighted
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