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The method colligates weighting moving average residual within L time window to detect multi-type sensor fault,and uses neural network technique to online re-construct sensor signal,and achieves the tolerant proportional integral derivative control.

该方法应用加权移动平均残差技术对传感器故障进行检测,并利用神经网络建模技术在线重构故障传感器信号,重组PID控制器反馈回路,实现容错PID控制。通过在三水箱过程设立多种不同类型的传感器故障,进行仿真研究。

The system can not only monitor and diagnose trouble on line about these sets running state, but also provide the basic state and the ability of maintenance situation message, it conjoins the vibration data and technical parameter and present regular monitor message, it realizes the regular assessment in common running condition of the sets and the comprehensive trouble diagnosis analysis in unusual running condition, it provides important foundation for maintenance and the sets trouble found earlier.

系统不仅可以对这些机组的运行状态进行在线监测和故障诊断,而且还应提供机组基本状况及维修情况信息采集功能,将振动数据、工艺参数及现有的人工定期监测信息结合起来,实现机组正常状态的定期评估和机组异常状态下的综合故障诊断分析,为机组故障的早期发现和维修决策提供重要依据。

The paper analyses optimal switching devices in the distribution networks, sets up a model to decide to judge types and numbers of switchs in proper location of distribution networks and applies to partical swarm optimization to compute. The simulation system is constituted with matlab. The paper discusses and analyses theory of fault location ,excogitates a synthesis matrix algorithm and an algorithm based on GPRS for fault location and isolation.

本文对配电网开关优化配置进行了分析并建立了数学模型,应用粒子群优化算法来确定配电网馈线相应位置的开关种类和数量并进行了matlab仿真;对故障定位的原理进行了详细的讨论和分析,研究出了故障定位的综合矩阵法和一种基于通用分组无线业务的配电网故障定位与隔离的方法。

A data precessing method is provided through constructing the power transformer fault information data warehouse, based on analyzing and reorganizing the various existing data sources, the transformer failure diagnosis and early failure predication can be benefit from OLAP (On-Line Analysis Processing) and data mining technology.

为了进行变压器状态和故障自动预测,以及便于维护人员对于变压器状态进行人工预测,提出了构建电力变压器数据仓库的数据处理思想,在对有关变压器信息的多种数据源进行分析和重新组织的基础上,利用联机分析处理和数据挖掘技术,可对变压器故障诊断和早期故障预测起到积极作用。

First the power spectrum of fault signals were decomposed by wavelet analysis, which predigests choosing method of fault eigenvectors, and then the LSSVM was adopted to diagnose faults.

首先对故障信号功率谱进行小波分解,简化了故障特征向量的提取,然后采用最小二乘支持向量机进行故障诊断。

The system cooperates with local sensor to realize the automatic online fault detection. The main drive element of system is cylinder. Cylinder reciprocates between positions.

针对大中型工业控制系统直接通过人工检测难以及时准确检测出故障点的情况,设计一种在线故障检测系统,采用西门子系列PLC和触摸屏,结合现场传感器实现自动在线故障检测。

On the foundation of the analysis,a fault diagnosis method which is an advanced pattern recognition method is proposed and a fault diagnosis system of generator excitation power unit based on virtual instrument is developed.It is proved by experiment that the fault diagnosis system can precisely judge which thirstier goes wrong and get accurate diagnosis result.

发生晶闸管直通故障时,瞬间将造成相电压短路,短路电流使保护电路动作;而发生晶闸管开路故障时(如晶闸管器件门极损坏或触发脉冲丢失等故障),功率单元仍然工作,但输出励磁电压的脉动增大,平均值降低,这种带病工作导致励磁电压波形产生畸变,从而导致了发电机工作在不稳定状态,同时也加大了对电网的干扰[2]。

In chapter two, taking a salient-pole synchronous generator for example, a general mathematical model of analyzing internal armature winding fault is established by multiloop theory.

第二章以凸极同步发电机为例,应用多回路理论建立了定子绕组内部故障分析的通用数字仿真模型,并通过回路关联矩阵方法自动形成了定子绕组各种故障的回路参数,为详细分析同步发电机定子绕组内部故障奠定了基础。

In chapter eight, the new software system named"simulation and protection scheme analysis of synchronous generator with internal armature winding faults", is developed and introduced. This software can be broadly applied to the analysis and protection study of synchronous generator with internal armature winding faults.

该系统能方便地对任意尺寸、槽数、极对数、绕组型式以及不同中性点联接方式等的大型水轮发电机和汽轮发电机进行各种内部故障电气量的计算,同时能对内部故障保护方案进行优化组合并校核其灵敏度,可广泛应用于大型同步发电机定子绕组内部故障分析与保护方案研究等场合。

Based on the transient simulation program of stator winding internal faults in synchronous generator, this paper presents the effect of stator winding and damper bar resistance on transient and steady currents. It is very necessary to calculate precisely the resistance of stator winding and damper bar resistance in order to simulate fault correctly.

应用同步发电机故障暂态仿真程序分析了定子和转子回路的电阻对发电机故障暂态过程的影响,结果表明为了准确进行发电机内部故障暂态过程计算,应该全面考虑影响的各种因素,准确求取定子和转子回路的电阻。

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