马马崖电站发电机励磁碳刷温度在线监测系统设计

发电机碳刷、滑环传统人工巡视工作方式已不适应当下"无人值班、少人值守"水电站及智能水电厂巡检技术发展的要求,针对马马崖电站发电机励磁碳刷温度在线监测系统应用需求、系统结构、红外热像仪参数选型、设备安装及系统软件功能设计等方面展开详细阐述,为我国水电站碳刷及滑环温度在线监测和故障预警提供了一条切实可行的技术实施路径,同时...     

大型水电站励磁系统可控硅击穿故障分析

励磁系统是水电站发电机组最重要的控制系统,也是重要的组成部分。励磁系统在实际运行过程中出现故障时将直接威胁到水电站机组的安全运行。本文介绍了水电站一起典型的励磁系统故障——大型水电站一次可控硅击穿事故,分析励磁可控硅击穿导致整流柜烧毁事故起因、过程以及后续处理措施。根据现场设备受损情况和继保设备记录,分析判断出事故原因,并对预后措施进行了描述,根据现象分析了发生的原因,并提出了相应的解决对策,希望对水电行业尤其是水电站运行维护相关人员有一定的借鉴意义。     

华能澜沧江小湾电站励磁系统的设计与应用

介绍了小湾电站励磁系统中励磁变压器的设计计算方法和可控硅整流、灭磁和过压的设计以及调节器软件的各种功能,指出了小湾电站励磁系统中的创新点。总结已投运大型水轮发电机组的设计经验,对大容量水轮发电机组励磁系统的设计具有参考意义。     

向家坝发电机灭磁系统的设计及选型

本文介绍了向家坝水电站灭磁系统的设计方案及器件选型,阐述了灭磁系统的时序和特点,并单总结世界最大水轮发电机组灭磁系统的设计经验,对大容量发电机组励磁系统应用具有重要的参考意义。     

柴油发电机组励磁系统电路分析

本文主要针对某公司生产的系列发电机组励磁系统进行了分析,并通过安装自动调压励磁系统及对其相关参数的分析计算,使得该系列发电机组工作的可靠性、稳定性和供电质量有了大幅度提高。     

柴油发电机组励磁系统电路分析

本文主要针对某公司生产的系列发电机组励磁系统进行了分析,并通过安装自动调压励磁系统及对其相关参数的分析计算,使得该系列发电机组工作的可靠性、稳定性和供电质量有了大幅度提高。     

核电厂应急柴油发电机1E级励磁系统设计探讨

介绍了核电厂应急柴油发电机组1E级励磁系统的总体性能要求和鉴定要求;开展了励磁系统安全功能的分析;阐述了新型可控相复励无刷励磁系统的基本架构和主要功能特性。重点介绍了相复励设计要点,实现安全功能的自动电压调节器和提高系统性能的不执行安全功能的辅助调节器的特点,以及1E级与N1E级电气隔离原则。为1E级应急柴油发电机数字式励磁系统设计和研发提供参考。     

微机励磁系统及移相控制的实施

本文介绍单板微机励磁系统的原理结构框图;给出微机励磁调节器的应用软件;提出一种具有良好性能的励磁调节方案;设计出励磁系统移相控制接口电路,并进行了分析和试验。本系统对水轮发电机组的可控硅励磁系统具有广泛的适用性。     

石泉水电厂3号发电机组励磁系统改造

对石泉水电厂3号发电机组励磁系统由原来的直流励磁机励磁改造为广州电器科学研究所的FJL型静止式励磁装置励磁的改造过程、经验进行了总结,并对新励磁系统的构造、性能和功能进行了主要介绍。     

小浪底水电厂水轮发电机组励磁系统的运行分析

以小浪底水电厂水轮发电机组励磁装置为例,介绍了励磁系统的构成、主要设备参数和灭磁方式,并分析了励磁系统的运行和维护情况.应用结果表明,该套励磁系统具有自动化程度高、功能齐全、运行稳定及故障率低的特点,满足了电厂安全稳定运行的要求.     

二滩水电厂各机组运行稳定性综合分析

通过综合比较二滩水电厂6台机组不同水头下的运行稳定性试验结果,分析了各机组影响运行稳定性的各项测试指标的优劣,掌握了各台机组工作性能。依据二滩水电厂历年全水头运行稳定性试验数据,绘制了各机组运行稳定区域特性曲线图,为电力系统提供了调度参考,为电厂各机组的安全、经济运行提供了依据。     

基于CC2430的水轮发电机组无线振摆监测系统研究

针对现有水轮发电机组振摆监测系统永久性结构模式问题．构建了基于CC2430的水轮发电机组无线振摆监测系统。给出了系统的体系结构和工作流程;设计基于CC2430模块的无线传感器节点：详尽给出系统能源、信号同步及采样精度测试等关键技术的解决方案;为中小型水轮发电机组状态监测提供了一套方便、实用可靠、低成本的无线监测系统。     

水轮发电机组轴系统稳定性分析及抗振设计

用有限元法建立了力学模型.采用移位迭代法计算了机组轴系统横向振动的自振频率．研究分析了立式机组轴系统的稳定性；提出对振源控制和机组轴系统结构优化的建议，为合理选择机组形式和优化支撑结构提供依据.控制和避免过大的有害振动的发生．保证机组运行的稳定、安全和寿命。     

水轮发电机组结构振动及基础承载力计算分析

灯泡贯流式水轮发电机组一般采用卧轴结构,通过对大轴可能存在的载荷工况进行了全面的分析,得出了影响卧式轴系的主要运行工况,为设计和安装提供了技术支持。     

Optimal hydrogenerator governor tuning with a genetic algorithm

The authors investigate the application of a genetic algorithm for optimizing the gains of a proportional-plus-integral controller for a hydrogenerator plant. The genetic algorithm was applied to optimal tuning of a governor for a hydrogenerator plant. Analog and digital simulation methods are compared for use in conjunction with the genetic algorithm optimization process. It is shown that analog plant simulation provides advantages in speed over digital plant simulation. This speed advantage makes application of the genetic algorithm in an actual plant environment feasible. The genetic algorithm is shown to possess the ability to reject plant noise and other system anomalies in its search for optimizing solutions     

Partial discharge inference by an advanced system. Analysis of online measurements performed on hydrogenerator

A new system aimed at performing partial discharge measurements and condition assessment on electrical apparatus is presented. It is able to separate the conventional phase resolved partial discharge pattern into a series of sub-patterns, each of them containing partial discharge data generated by a single kind of defect, which makes easier identification of the source generating partial discharges. Application of the system to partial discharge data recorded on an hydrogenerator is reported to support its effectiveness.     

Adaptive speed control of hydrogenerators by recursive leastsquares identification algorithm

An inherent challenge to hydrogenerator speed regulation is the nonlinear and time varying nature of the process. When a fixed gain controller is used to regulate such a process, globally stable system response can be achieved only at the expense of degraded off design-point performance. This paper considers the application of an adaptive control methodology that allows the controller gains to automatically adjust to changing process variables and thereby provide uniform closed loop response over a wide range of operating conditions. Preliminary findings derived from a calculated plant model, and a standard recursive identification technique, indicate that the adaptive system provides desirable dynamic response despite changes in system operating dynamics, maintaining stable operation in situations where constant gain schedules fail     

Stability investigation of a longitudinal power system and itsstabilization by a coordinated application of power system stabilizers

This paper presents the results of a stability investigation of a power system with longitudinal structure and its stabilization by coordinated power system stabilizers (PSSs). The effects of the existing controllers on system stability are studied. If no PSSs are present, the damping of various swing modes in the system will be very poor and low frequency oscillations present. Eigenvalue analysis shows that the undamped modes are sensitive to excitation control while speed governors have little influence on damping. In order to enhance the overall system stability through excitation control, a coordinated design procedure for power system stabilizers has been developed based on generation coherency, total coupling factor and nonlinear simulation. A PSS designed using this procedure is robust to different operating conditions and very effective for damping oscillations. Comprehensive simulation studies were conducted and results are presented     

Hydrogenerator system identification using a simple geneticalgorithm

This paper investigates an identification procedure for a hydrogenerator plant using an adaptive technique. The procedure operates on field data consisting of sampled gate position and electrical frequency. The field data was recorded while the plant was operating under various load conditions. The procedure adapted to ongoing plant changes by continuously updating the identification results. It is shown that the adaptive technique, in this case genetic algorithm based, was capable of identifying the hydrogenerator system and following plant parameter changes while the plant operated under conditions of sufficient frequency excursions. These conditions include offline and isolated network operation where effective control is critical     

水轮发电机圆盘式转子支架的组装与焊接

介绍了水轮发电机圆盘式转子支架的结构特点．阐述了圆盘式转子支架的组装和焊接工艺及控制焊接变形的工艺措施。