摘要
风速的随机性与不确定性以及塔影效应与风的纵向剪切效应,会激励大型永磁同步风电机组(PMSWT)传动轴的固有频率,引发机组振动。振动过程不仅会产生巨大的污染噪声,还容易造成机组零部件的松动与各执行机构的损害,加快传动轴的疲劳,直至其疲劳寿命耗尽而出现裂纹或断裂,严重影响机组的使用寿命。此外,振动更易引起并网电压闪变及功率的波动,影响所发电能的质量。首先采用模态分析法将兆瓦级永磁同步风电机组在最大功率点跟踪(MPPT)时传动轴振动分为刚性旋转振动与扭转振动。然后针对传动轴振动的产生原因与机理做了详细的分析研究。通过理论推导得出电容储能的变化含有机组振动的信息,且该信息容易获取,因而从该点出发提出了相应的振动抑制方案。所提控制方案通过在转速环与转矩环引入了与电容储能变化相关的补偿转速与补偿转矩,无需检测其他振动信息、简单、易实现,具有一定的实际应用价值。结果表明所提方案增强了机组的抗扰特性,能有效抑制传动轴的扭振,并减轻轴系的刚性振动,同时还可充分利用风能,提高机组的发电量与所发电能的品质。
Due to the randomness and uncertainty of wind speed,the shadow effect and wind shear effect can motivate the natural frequencies of the transmission shaft on large PMSWT,which triggers shaft vibration.This vibration process will not only produce huge noise,but also easily lead to the loosening of unit parts and damage of the actuator,to speed up the transmission shaft fatigue until its fatigue life runs out.It can seriously affect the service life of the unit.In addition,vibration is more likely to cause grid voltage flicker and power fluctuation,affecting the power quality.In this paper,shaft vibration of permanent magnet synchronous wind turbine（PMSWT） during the time of maximum power point tracking（MPPT） can be divided into rigid vibration and torsional vibration based on modal analysis.Then,the reason and theory of shaft vibration have been analyzed,and the corresponding strategy has been proposed to suppress the shaft vibration.The proposed strategy can suppress the torsional vibration effectively,reduce the rigid vibration,make full use of wind energy,and improve the capacity of wind turbine.
出处
《电工技术学报》
EI
CSCD
北大核心
2018年第4期930-942,共13页
Transactions of China Electrotechnical Society
基金
陕西省重点研发计划项目资助(2017GY-061)
关键词
模态分析
永磁同步风电机组
最大功率点跟踪
扭振
刚性振动
Modal analysis, permanent magnet synchronous wind turbine （PMSWT）, maximum power point tracking （MPPT）, torsional vibration, rigid vibration
