基于损耗和谐波分析的多工况双馈风力发电机定子匝间短路故障研究
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摘要
为了准确及时地识别并排除多工况下双馈风力发电机定子绕组匝间短路故障,通过ANSYS软件建立了新疆某风电场1. 5 MW双馈风力发电机的电磁场模型,对风机正常运行、风速突变、电网电压三相不平衡和机组低电压穿越工况进行仿真,处理后得到发电机的气隙磁密曲线。从损耗和谐波分析两个方面,以正常运行工况为标准对比研究发电机定子绕组匝间短路前后多工况特征量的变化。结果表明:发电机匝间短路后,基于损耗分析,不同的工况下电机的铁耗相较于故障前都有所增大;基于谐波分析,电网三相电压不平衡和低电压穿越工况的特定次谐波会导致更为严重的故障。
In order to accurately and timely identify and eliminate the inter-turn short-circuit fault of stator winding of doubly-fed wind generator( DFIG) under different operating conditions,the electromagnetic field model of a 1. 5 MW DFIG in a windfarm in Xinjiang is established by ANSYS software. The generator under different operating conditions of normal operation,sudden change of wind speed,grid voltage three-phase unbalance and low voltage ride-through is simulated,and the air gapmagnetic density curves of generator are obtained. The changes of characteristic quantity before and after inter-turn short-circuitare compared with that under normal operating condition from two aspects of loss and harmonic analyses respectively. Theresults show that,( a) based on loss analysis,the iron loss of generator after fault is increased compared with that before fault;and( b) based on harmonic analysis,the specific sub-harmonics under the operating conditions of grid voltage three-phaseimbalance and low voltage ride-through can cause more serious fault.
In order to accurately and timely identify and eliminate the inter-turn short-circuit fault of stator winding of doubly-fed wind generator( DFIG) under different operating conditions,the electromagnetic field model of a 1. 5 MW DFIG in a windfarm in Xinjiang is established by ANSYS software. The generator under different operating conditions of normal operation,sudden change of wind speed,grid voltage three-phase unbalance and low voltage ride-through is simulated,and the air gapmagnetic density curves of generator are obtained. The changes of characteristic quantity before and after inter-turn short-circuitare compared with that under normal operating condition from two aspects of loss and harmonic analyses respectively. Theresults show that,( a) based on loss analysis,the iron loss of generator after fault is increased compared with that before fault;and( b) based on harmonic analysis,the specific sub-harmonics under the operating conditions of grid voltage three-phaseimbalance and low voltage ride-through can cause more serious fault.
引文
[1]张新燕.风电并网运行与维护[M].北京:机械工业出版社,2011.
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[4]孙丽玲,房丹.定子匝间故障的双馈风力发电机组的建模与低电压穿越分析[J].电力自动化设备,2016,36(11):82-87.
[5]史丽萍,汤家升,王攀攀,等.采用最优小波树和改进BP神经网络的感应电动机定子故障诊断[J].电工技术学报,2015,30(24):38-45.
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[8]门亚萍,张新燕,赵勃遥,等.基于不同运行工况下双馈风力发电机电磁场计算与分析[J].电测与仪表,2016,53(1):50-56.
[9]马理.双馈式风力发电机定子绕组匝间短路的电磁场分析[D].保定:华北电力大学,2012.
[2]SIDDIQUE A,YADAVA G S,SINGH B.A review of stator fault monitoring techniques of induction motors[J].IEEE Transactions on Energy Conversion,2005,20(1):106-114.
[3]许伯强,张舒怡.定子故障下的双馈风力发电机组建模与稳定性分析[J].电力自动化设备,2016,36(9):93-99.
[4]孙丽玲,房丹.定子匝间故障的双馈风力发电机组的建模与低电压穿越分析[J].电力自动化设备,2016,36(11):82-87.
[5]史丽萍,汤家升,王攀攀,等.采用最优小波树和改进BP神经网络的感应电动机定子故障诊断[J].电工技术学报,2015,30(24):38-45.
[6]段晓田,张新燕,张俊,等.基于有限元法的双馈风力发电机电磁场计算与分析[J].电网技术,2012,36(2):231-236.
[7]高原.同步磁阻永磁电机电磁场及性能分析[D].天津:天津大学,2008.
[8]门亚萍,张新燕,赵勃遥,等.基于不同运行工况下双馈风力发电机电磁场计算与分析[J].电测与仪表,2016,53(1):50-56.
[9]马理.双馈式风力发电机定子绕组匝间短路的电磁场分析[D].保定:华北电力大学,2012.