1．5 MW直驱永磁风力发电机冗错技术的研究

为了提高大功率永磁风力发电机的运行可靠性,文章以额定功率1．5MW、78极324槽的直驱永磁风力发电机为例,阐述了两种直驱永磁风力发电机变流器拓扑结构的工作原理及特点,基于MATLAB/SIMULINK仿真技术,分析了直驱永磁风力发电机在缺相、变流器故障以及额定状态下的运行特点,通过仿真表明：采用容错技术,可使直驱永磁风力发电机在缺相、变流器故障时运行情况与正常运行情况基本相同,提高了电机在风力发电系统中的可靠性。     

Observer based fault-tolerant control for a class of nonlinear networked control systems

In this paper, we present a fault-tolerant control (FTC) framework for a class of nonlinear networked control systems (NCSs). Firstly, the plant is transformed into two subsystems with one of them decoupled from the system fault. Then, the nonlinear observer is designed to provide the estimation of unmeasurable state and modelling uncertainty, which are used to construct fault estimation algorithm. Considering the sampling intervals occurred by net, a fault-tolerant control method is proposed for such nonlinear NCSs using the impulsive system techniques. The controller gain and the maximum sampling interval, which make the faulty system stable are given. An example is included to show the efficiency of the proposed method.     

Study on inverter fault-tolerant operation of PMSM DTC

This paper presents an investigation of inverter fault-tolerant operation for a permanent magnet synchronous motor （PMSM） direct torque control （DTC） system under various inverter faults. The performance of a faulty standard 6-switch inverter driven PMSM DTC system is analyzed. To avoid the loss or even disaster caused by the inverter faults, a topology-modified inverter with fault-tolerant capability is introduced, which is reconfigured as a 3-phase 4-switch inverter. The modeling of the 4-switch inverter is then analyzed and a novel DTC strategy with a unique nonlinear perpendicular flux observer and feedback compensation scheme is proposed for obtaining a continuous, disturbance-flee drive system. The simulation and experimental results demonstrate that the proposed inverter fault-tolerant PMSM DTC system is able to operate stably and continuously with acceptable static and pretty good dynamic performance.     

Guaranteed-cost reliable control with regional pole placement of a power system

This paper deals with the simultaneous coordinated design of power system stabilizer (PSS) and the flexible ac transmission systems (FACTS) controller. The problem of guaranteed cost reliable control with regional pole constraint against actuator failures is investigated. The state feedback controllers are designed to guarantee the closed loop system satisfying the desired pole region, thus achieving satisfactory oscillation damping and settling time, and having the guaranteed cost performance simultaneously. The proposed controllers satisfy desired dynamic characteristics even in faults cases. The controller's parameters are obtained using the linear matrix inequalities (LMI) optimization. Simulation results validate the effectiveness of this approach.     

基于ROSE HA系统的双机容错方案

介绍了ROSE公司开发的双机容错软件的配置使用过程,及如何在工程项目中保证应用系统的稳定性和可靠性,实现系统不间断运行。     

一种具有容错机制的以太网的研究与设计

随着网络应用的日益普及,对网络传输可靠性的要求也越来越高。为此,提出了一种具有冗余容错机制的双网以太网系统模型。在该模型中,各网络节点主机分别连接在两个以太网上,并采用主、备用网络运行机制。即数据传输只使用其中一个网络,另一个网络作为备份,当主网出错时,再启用备份网络接替主网传输数据。还给出了这个模型的具体实现方法。与现有的容错系统相比,该系统通过增加少量成本,在通信子网层次上实现了网络的高可靠性,对实时性、可靠性有严格要求的专用网络建设具有较为重大的意义。