考虑负荷快速频繁调节的汽轮-发电机组轴系扭转寿命损耗分析

发布时间：2018-01-19 21:31

本文关键词： 汽轮-发电机负荷调节有限元分析扭转寿命损耗爬坡率调峰范围模型　出处：《电力自动化设备》2017年08期 　论文类型：期刊论文

【摘要】：针对未来可再生能源发电容量比例不断提升、传统火力发电机组由承担腰荷的角色向具有深度调峰能力的角色转变的发展趋势,研究汽轮-发电机快速频繁调节出力引起的扭转寿命损耗。利用有限元分析软件ANSYS,建立了汽轮-发电机组轴系模型,得到危险轴段的扭转响应;利用雨流计数法将工作循环应力转化为对称循环下的疲劳应力;考虑负荷的频繁波动,结合Manson-coffin应变-寿命公式和连续损伤理论评估轴系扭转寿命损耗。以国产600 WM超临界汽轮-发电机为例进行仿真,研究扭转寿命损耗与负荷波动性、随机性的关系:随着爬坡率和调峰范围的提高,寿命损耗呈指数增长;权衡机组寿命损耗与可再生能源的消纳,根据机组运行特点选择适当的爬坡率和调峰范围是火电机组将来作为深度调峰机组使用的关键;当考虑负荷的频繁波动特性时,扭转寿命损耗符合累积规则,这是由转子扭转振荡衰减较快造成的。
[Abstract]:In view of the increasing proportion of renewable energy generation capacity in the future, the development trend of traditional thermal power generating units from the role of waist load to the role of deep peak-shaving capacity changes. The torsional life loss caused by fast and frequent adjustment of turbine-generator force is studied. By using finite element analysis software ANSYS, the shaft system model of turbine-generator unit is established, and the torsional response of dangerous shaft segment is obtained. The working cyclic stress is transformed into the fatigue stress under symmetrical cycle by the method of rain flow counting. Consider the frequent fluctuations of the load. Combined with Manson-coffin strain-life formula and continuous damage theory, the torsional life loss of shafting is evaluated. The simulation of 600WM supercritical turbo-generator is carried out. The relationship between torsional life loss and load volatility and randomness is studied. With the increase of slope climbing rate and peak regulation range, the life loss increases exponentially. The key to use thermal power units as deep peak-shaving units in the future is to balance unit life loss and renewable energy consumption and select appropriate slope climbing rate and peak-shaving range according to unit operating characteristics. When considering the frequent fluctuation of the load, the torsional life loss accords with the cumulative rule, which is caused by the fast attenuation of the torsional oscillation of the rotor.
【作者单位】：华北电力大学电气与电子工程学院;
【基金】：国家自然科学基金资助项目(51077053)~~
【分类号】：TM311
【正文快照】： 0引言未来几十年将形成以核电为基荷、风光等可再生能源发电容量比例大幅提升、高能耗的传统火力发电机组的装机容量逐渐减小、负荷侧需求管理更加科学合理的电网清洁能源结构。由于风光等可再生能源发电具有随机和不确定的特点,大规模可再生能源发电接入后将影响电网的灵活性

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