次同步振荡引起的发电机组轴系疲劳损伤  

Fatigue Damage of Turbine Generator Shafting Caused by Subsynchronous Oscillations

作　　者：刘超[1] 蒋东翔[1] 谢小荣[2] 洪良友[1] 

机构地区：[1]电力系统国家重点实验室,清华大学热能工程系,北京市100084 [2]清华大学电机系,北京市100084

出　　处：《电力系统自动化》2010年第15期19-22,84,共5页Automation of Electric Power Systems

基　　金：国家电网公司科技项目"电网与机组次同步振荡和发电机组轴系扭振问题研究"~~

摘　　要：为提高电网输送能力而被广泛采用的各种电力电子装置可能会带来电网次同步振荡风险。文中针对电网可能发生的次同步振荡现象,分析600MW汽轮发电机组轴系结构,通过机网耦合计算分析次同步振荡引起的机组轴系扭振,采用应力分析和疲劳寿命计算分析次同步振荡对机组轴系的疲劳损伤。研究了不同参数所引起的轴系扭振特点,重点比较次同步振荡幅值和频率对轴系疲劳损伤的影响。分析和研究结果将有助于提高机组寿命管理水平,有效评估电网波动容许值。The risk of sub-synchronous oscillation （SSO） increases as increasing numbers of power electronic devices in power networks are being used to improve the systems’ transmission capacity. The possible SSO phenomenon in power networks in China is analyzed based on the study of a 600 MW turbine generator shafting. The torsional vibration is analyzed based on the coupled system between units and the network; then the fatigue damage is studied based on the stress analysis and fatigue cumulation. The network disturbance amplitude and frequency are studied because they have significant impacts on shafting fatigue damage. The results can provide useful information in support of the unit’s life cycle management and efficient evaluation of the permissible value of network disturbances.

关 键 词：次同步振荡 汽轮发电机组 扭振 疲劳损伤 

分 类 号：TM311[电气工程—电机]