摘要
新型电力系统建设要求缩短抽水蓄能机组的快速响应时间。以具体电站机组为例,研究了正常与快速抽水转发电模式下监控流程的主要差异和机组稳定参数的变化规律。在此基础上,引入反时限振动评价方法对两种模式下的振动峰峰值进行计算,评估了转换模式对机组的影响;采用频谱分析方法对无叶区压力脉动进行分析,发现了低转速下无叶区存在水力共振现象,并揭示了共振幅值、频率与转速的相关性。研究结果表明:抽水转发电快速流程优于正常流程,快速转换模式下的水力制动方式较正常转换模式下的电气制动加机械制动方式流程时间由438 s缩短至220 s,显著提高工况转换效率;在振动对机组损伤方面,14个振动、摆度监测点中13个监测点证明快速转换模式有利于延长机组预期寿命;同时,快速转换模式有利于机组快速通过低转速下无叶区产生的水力共振区,将水力共振时间由15 s缩减至5 s,共振转速区间压缩超过60%。
The construction of a new power system requires to improve the response time of pumped storage units.In this paper,taking a specific pumped-storage unit as an example,systematical research is performed on the main differences of sequence control process and the variation law of unit stability parameters under normal and fast pumping to generating mode.Based on that,the in-verse-time vibration evaluation method is introduced to evaluate the impact of transition modes on the unit vibration peak-to-peak values.By analyzing the pressure fluctuation in the vaneless zone with the frequency spectrum analysis method,the phenomenon of hydraulic resonance in the vaneless region at low speed is found in generating rotation,and the correlation between resonance ampli-tude,frequency and speed is revealed.The research indicates that the mode transition from pumping to generate the fast transition is better than the normal transition.Compared with the braking method of electrical brake plus mechanical brake in normal transi-tion,the hydraulic braking mode under fast transition can significantly shorten the transition time from 438 s to 220 s.From the per-spective of vibration damage to the unit,13 of the 14 vibration and runout monitoring points prove that fast transition is conducive to prolong the expected life of the unit.Meanwhile,the fast transition is favorable to pass the hydraulic resonance occurring in vane-less zone at low speed.The hydraulic resonance time is reduced from 15 s in normal transition to 5 s in the fast transition,and the resonance speed range is compressed by more than 60%.
作者
张飞
郑源
赵毅锋
王康生
ZHANG Fei;ZHENG Yuan;ZHAO Yi-feng;WANG Kang-sheng(Pumped Storage Technological&Economic Research Institute of State Grid Xinyuan Company Ltd.,Beijing 100761,China;College of Energy and Electrical Engineering,Hohai University,Nanjing 211100,China;Jiangxi Hongping Pumped Storage Co.,Ltd.,Yichun 330603,China)
出处
《振动工程学报》
EI
CSCD
北大核心
2024年第1期104-112,共9页
Journal of Vibration Engineering
基金
国家电网公司科技项目(52573021N00C)
国家自然科学基金资助项目(51809082)。
关键词
抽水转发电
稳定性参数
水力共振
水力制动
振动评价
pumping operation to generating operation
stability parameters
hydraulic resonance
hydraulic braking
vibration evaluation
