电网短路故障下双馈风电机组传动链扭振疲劳可靠性分析

doi:10.19912/j.0254-0096.tynxb.2020-0254

太阳能学报 ›› 2022, Vol. 43 ›› Issue (2): 380-388.DOI: 10.19912/j.0254-0096.tynxb.2020-0254

电网短路故障下双馈风电机组传动链扭振疲劳可靠性分析

仇世龙¹, 李辉^1,2, 龚立娇¹, 王宾^1,3, 柴兆森^1,2, 司金冬¹

1.石河子大学机械电气工程学院,石河子 832003;
2.输配电装备及系统安全与新技术国家重点实验室（重庆大学）,重庆 400044;
3.电力系统及发电设备安全控制和仿真国家重点实验室（清华大学电机系）,北京 100084

收稿日期:2020-03-23 出版日期:2022-02-28 发布日期:2022-08-28
通讯作者: 李辉（1973—）,男,博士、教授、博士生导师,主要从事风力发电技术、电力电子器件可靠性和应用方面的研究。cqulh@163. com
基金资助:
国家自然科学基金（51675354）

TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT

Qiu Shilong¹, Li Hui^1,2, Gong Lijiao¹, Wang Bin^1,3, Chai Zhaosen^1,2, Si Jindong¹

1. School of Mechanical and Electrical Engineering, Shihezi University, Shihezi 832003, China;
2. State Key Laboratory of Power Drivetrain Equipment and System Security, Chongqing University, Chongqing 400044, China;
3. State Key Lab of Control and Simulation of Power Systems and Generation Equipment （Department of Electrical Engineering）, Tsinghua University, Beijing 100084, China

Received:2020-03-23 Online:2022-02-28 Published:2022-08-28

摘要/Abstract

摘要： 双馈风电机组电气故障扰动引起的电磁转矩波动易造成轴系传动链扭振疲劳,有必要研究电网短路故障对机组传动链扭振疲劳可靠性的影响。首先建立考虑关键部件柔性的传动链有限元模型,通过模态分析获取传动扭振模态。其次基于集中质量法,建立机电耦合模型,以电网短路故障为扰动因素,仿真分析电网短路故障下电磁转矩动态响应。最后将电网短路故障下发电机电磁转矩扰动作为激励,借助ANSYS Designlife平台构建传动链扭振疲劳可靠性模型,分析机组传动链在电网短路故障下电磁转矩波动对扭振疲劳可靠性的影响。结果表明：三相接地故障时电磁转矩波动最剧烈,对传动链的疲劳可靠性影响更大;电网发生短路故障时,电磁转矩中存在低频分量可与高速轴的扭振模态耦合,激发高速轴的扭振,加剧高速轴的疲劳损伤;电磁转矩激发的扭振具有传递效应,越靠近发电机的部件扭振越明显,可靠性越低。

关键词: 风电机组, 传动链, 双馈, 扭振, 有限元, 疲劳寿命, 可靠性

Abstract: The electromagnetic torque fluctuation caused by the electrical fault disturbance of the doubly-fed wind turbine can easily cause torsional vibration fatigue of the shafting drivetrain. It is necessary to study the influence of grid short-circuit fault on the torsional vibration fatigue reliability of the drivetrain of the unit. Firstly, the finite element model of the drivetrain considering the flexibility of key components was established, and the torsional vibration mode was obtained through modal analysis. Secondly, based on the concentrated mass method, an electromechanical coupling model was established, the short-circuit fault of the power grid was used as the disturbance factor, and the dynamic response of the electromagnetic torque under the short-circuit fault of the power grid was simulated and analyzed. Finally, the electromagnetic torque fluctuations generated by the short circuit fault of the power grid were used as the unbalanced excitation source that causes the torsional vibration of the doubly-fed wind turbine drivetrain, the ANSYS Designlife platform was used to construct a torsional fatigue reliability model for the drivetrain and the influence of electromagnetic torque fluctuations on the torsional fatigue reliability of the drivetrain under grid short circuit faults was analyzed. The results show that the electromagnetic torque fluctuation is the most severe when the three-phase ground fault occurs, which has a greater impact on the fatigue reliability of the drivetrain; When there is a short-circuit fault in the power grid, the low-frequency component of the electromagnetic torque can be coupled with the torsional vibration mode of the high-speed shaft to stimulate the torsional vibration of the high-speed shaft and aggravate the fatigue damage of the high-speed shaft. The torsional vibration excited by electromagnetic torque has a transmission effect, and the closer the components to the generator are, the more pronounced the torsional vibration and the lower the reliability.

Key words: wind turbines, drivetrain, doubly-fed, torsional, finite element, fatigue life, reliability

中图分类号:

TK83

仇世龙, 李辉, 龚立娇, 王宾, 柴兆森, 司金冬. 电网短路故障下双馈风电机组传动链扭振疲劳可靠性分析[J]. 太阳能学报, 2022, 43(2): 380-388.

Qiu Shilong, Li Hui, Gong Lijiao, Wang Bin, Chai Zhaosen, Si Jindong. TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT[J]. Acta Energiae Solaris Sinica, 2022, 43(2): 380-388.

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电网短路故障下双馈风电机组传动链扭振疲劳可靠性分析

TORSIONAL FATIGUE RELIABILITY ANALYSIS OF DOUBLY-FED WIND TURBINE DRIVETRAIN UNDER POWER GRID WITH SHORT CIRCUIT FAULT

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