共查询到20条相似文献,搜索用时 31 毫秒
1.
通过两例300MW不同机型汽轮发电机的端部固有频率测试及模态参数识别分析,说明发电机端部固有频率测试及模态参数识别是检查发电机端部结构情况的重要手段,并介绍了这两种发电机端部结构模态参数的特点. 相似文献
2.
3.
对发电机定子绕组端部固有频率的测试及模态试验分析作了简要的介绍。对端部绕组振动的在线监测作了简要分析,同时提出了一些个人看法。 相似文献
4.
5.
发电机定子绕组端部机械振动模态的测量 总被引:2,自引:0,他引:2
介绍了发电机定子绕组端部的结构及其所受的电磁力,阐述了其模态测量的重要性;论述了机械振动模态分析原理和试验模态参数识别的原理;描述了发电机定子绕级端部模态测量系统的组成、测量方法以及信号分析和处理、模态参数识别的计算方法;指出了对实际测量数据进行分析应注意的问题。 相似文献
6.
发电机定子端部绕组动态特性标准探讨 总被引:1,自引:0,他引:1
以试验数据为基础,就现行的大型汽轮发电机定子端部绕组模态固有频率的评价标准提出了一些看法,认为现行标准的评价准则偏高,不利于现场机组的评价和处理,同时建议对线棒局部固有频率和端部整体椭圆模态固有频率采用不同的评价标准。 相似文献
7.
8.
介绍了汽轮发电机定子端部固有频率的测试情况,并按照响应的考核标准对测试结果进行评定,认为定子端部响应比值小于440mm·s-2·N-1为合格。结果表明该汽轮发电机定子励端端部最大响应比值为:0.48mm·s-2·N-1对应的固有频率为104Hz。定子汽端端部最大响应比值为:0.58mm·s-2·N-1,对应的固有频率为88Hz。因此,可以认为本机组端部固有频率测试结果为合格。 相似文献
9.
随着发电机单机容量的增加,定子绕组端部受到的两倍频电磁力随之增大。如果定子绕组端部的固有频率接近100 Hz、振型为椭圆时最为严重。巴蜀江油电厂2×330 MW发电机系引进法国阿尔斯通机组,于1989年投产,运行至今已有15余年,有必要对发电机进行定子绕组端部振动模态试验。因此,介绍了发电机端部振动模态的试验方法及330 MW发电机的应用情况。 相似文献
10.
介绍了某发电公司百万等级汽轮发电机端部固有频率和模态异常情况,对发电机端部振频和模态异常数据进行了分析,并利用端部在线振动监测装置对运行设备的影响进行了分析,为百万级汽轮发电机设备状态分析提供了借鉴和参考. 相似文献
11.
为使发电机与改造后的汽轮机容量相匹配,华电国际邹县发电厂对300MW双水内冷(QFS)发电机进行了增容改造,进行了定子绕组端部模态试验、发电机最大负荷温升试验、发电机进相运行试验、发电机损耗及效率试验等性能试验。解决了QFS型发电机原有的一些问题,如因结构原因端部漏磁较大、定子端部压圈局部温度较高、不具备进相运行能力和发电机效率低等。改造后发电机运行可靠,功率由300MW提高到335MW,提高了11.67%,经济性和调峰性能均有显提高,为类似发电机的改造提供了经验。 相似文献
12.
Yanpeng Hao Guoli Wang Zhidong Jia Hengkun Xie 《Dielectrics and Electrical Insulation, IEEE Transactions on》2005,12(1):104-113
It is a challenge to diagnose insulation condition of stator bars using an ultrasonic technique, due to the complex structures of the stator bars and the high attenuation of the stator insulation. In this paper, five low frequency transducers were used in a pulse-echo configuration to try to test a standby stator bar of a generator (300 MW, 18 kV). With an available transducer, four types of insulation structures were tested on the stator bar. The short side insulation was compared with the large one of the stator bar in the slot. The stator bar near the exit from the slot and the end stator bar, were compared with the stator bar in the slot. The semiconductive coating covered stator insulation was compared with the uncoated one. The stator insulation having an insulation-copper interface was compared with that having an insulation-gas interface. In addition, insulation diagnosis tests in the laboratory were performed on two sets of stator bars, which had been in service for 18 and 23 years, respectively in two generators (300 MW, 18 kV). Field tests were performed on the stator bars near the exit from the slot and the end stator bars of a generator (300 MW, 18 kV). The experimental results demonstrated an availability of low frequency ultrasonic pulse-echo method for insulation condition diagnosis of large generators 相似文献
13.
叙述了锤击法的原理及数据处理方法,用锤击法对300MW汽轮发电机定子进行了模态试验研究,取得了300MW汽轮发电机定子在几个工序下,定子固有频率的变化规律,300MW发电机定子椭圆固有频率123Hz,结构设计合理,可保证机组不发生较大振动。对300MW汽轮发电机定子的优化设计和其它汽轮发电机定子的设计有一定的参考价值。 相似文献
14.
15.
Damping inter-area oscillation by generation rescheduling based on wide-area measurement information
Inter-area oscillations are inherent to power systems which can be caused due to oscillation of two coherent groups of generators against each other with low or negative damping. Poorly damped oscillations can pose various problems such as limiting transfer capabilities and in more severe cases can lead to uncontrolled islanding causing system blackout. In this paper, for damping inter-area oscillation a new method based on the wide area measurement system (WAMS) and using generation rescheduling (GR) is proposed. The proposed algorithm consists of three tasks; identification of inter-area mode, determination the most effective generators for rescheduling and enhancing damping of inter-area mode by GR. In this approach, first by means of Independent Component Analysis (ICA) and modified Random Decrement (RD) techniques and using on-line power and rotor angle oscillation data provided by WAMS, the frequency and damping of the inter-area mode is identified. In the case of low damping of oscillation, by using mode shape of the inter area mode, generation rescheduling is applied for improvement of damping. In this paper, a non-model based method is adopted for estimating mode shape from the measured data like generator rotor speeds. The proposed approach is applied on a two area small system and IEEE 39-bus test system and the results demonstrate effectiveness of the method for enhancing oscillation damping. 相似文献
16.
西柏坡发电厂300MW汽轮发电机定子线圈绝缘磨损严重,通过对其端部线圈振动固有特性的测试与分析,找到绝缘磨损的原因,并采取加固措施。 相似文献
17.
18.
大型汽轮发电机端部磁场的二维有限元分析及应用 总被引:1,自引:0,他引:1
简要介绍了在水氢冷300 MW汽轮发电机的设计中,应用端部电磁场二维有限元分析来优化发电机定子端部结构件的结构形状,分析了铜屏蔽的温升及其通风系统.温升试验实测数据与计算值符合.性能优良、制造简便的铜屏蔽结构技术已被成功地移植到我国首创的双水内冷300 MW发电机上. 相似文献
19.
20.
特高压直流送端孤岛系统频率稳定控制 总被引:1,自引:0,他引:1
特高压直流与大型水电机组配套电源采用送端孤岛运行方式,能有效消除由直流闭锁引起的潮流大范围转移、系统暂态功角失稳问题。但是,送端孤岛系统的频率稳定性是决定系统能否运行的关键因素之一。结合南方电网楚穗、普侨特高压直流孤岛的调试情况,研究了水电站与特高压直流送端孤岛系统超低频振荡的机理,提出了频率稳定控制策略;阐述了直流甩负荷导致部分机组调相运行的机理。机网协调控制RTDS试验平台的仿真结果以及特高压直流孤岛系统的现场调试结果表明了所提控制策略的有效性。 相似文献