低压穿越工况对大型DFIG绕组绝缘老化的影响
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摘要
为了研究低压穿越对1.5 MW双馈感应式风力发电机(Doubly Fed Induction Generator,DFIG)绝缘老化的影响和使绕组绝缘性能降低的因素,文章对电老化、热老化和机械应力老化模型进行分析。综合PSCAD和Ansoft仿真得到的低压穿越过程中电流、电压、转速等物理量的变化,以及不同低穿程度下发电机铁耗和铜耗反映出的铁芯和绕组的生热情况,利用老化模型判断低压穿越对绕组的绝缘性能产生的影响,进而分析其对匝间短路的影响。分析结果表明,低压穿越会对绕组绝缘性能产生恶劣影响,极有可能造成发电机匝间短路故障或者使故障恶化。
In order to study the influence of low voltage ride through on the insulation aging of 1. 5 MW doubly-fed induction generator and the factors that reduce the insulation performance of windings,the electrical aging,thermal aging and mechanical stress aging model are analyzed. The changes in physical quantities such as current,voltage,speed are obtained by PSCAD and Ansoft simulations during low voltage ride through conditions. The heat build-up of the core and winding is reflected by the iron and the copper consumption of the generator under different low voltage ride through degrees. Afterwards,the influence of low voltage ride through on the insulation performance of winding and the turn-to-turn short circuit is judged by the aging model. The analysis results show that the low voltage ride through has a bad influence on the insulation performance of the windings,and may cause the inter-turn short circuit fault or a deterioration of the generator.
In order to study the influence of low voltage ride through on the insulation aging of 1. 5 MW doubly-fed induction generator and the factors that reduce the insulation performance of windings,the electrical aging,thermal aging and mechanical stress aging model are analyzed. The changes in physical quantities such as current,voltage,speed are obtained by PSCAD and Ansoft simulations during low voltage ride through conditions. The heat build-up of the core and winding is reflected by the iron and the copper consumption of the generator under different low voltage ride through degrees. Afterwards,the influence of low voltage ride through on the insulation performance of winding and the turn-to-turn short circuit is judged by the aging model. The analysis results show that the low voltage ride through has a bad influence on the insulation performance of the windings,and may cause the inter-turn short circuit fault or a deterioration of the generator.
引文
[1]李俊卿,王栋,何龙.双馈式感应发电机定子匝间短路故障稳态分析[J].电力系统自动化,2013,47(18):103-107.Li Junqing,Wang Dong,He Long.Steady-state Analysis on Interturn Short Circuit Fault of Stator Windings in Doubly-fed Induction Generators[J].Automation of Electric Power Systems,2013,47(18):103-107.
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[3]栗然,王倩,卢云.Crowbar阻值对双馈感应发电机低电压穿越特性的影响[J].电力自动化设备,2014,34(4):101-107.Li Ran,Wang Qian,Lu Yun.Impact of Crowbar resistance on low voltage ride through of DFIG[J].Electric Power Automation Equipment,2014,34(4):101-107.
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[8]毕小玉,田慕琴,宋建成,等.主通风机电动机绝缘状态监测及故障诊断方法研究[J].工矿自动化,2013,39(9):31-36.Bi Xiaoyu,Tian Muqin,Song Jiancheng,et al.Research of insulation condition monitoring and fault diagnosing method of motor of mine main ventilator[J].Industry and Mine Automation,2013,39(9):31-36.
[9]王延安,侯云鹏,李伟力.大型水轮发电机定子绕组内股线绝缘热老化下的定子温度场计算[J].大电机技术,2002,(1):8-12.Wang Yan’an,Hou Yunpeng,Li Weili.Stator Temperature Fields Calculation of Large Hydrogenerator after Interturn Insulation Aging of Stator Wings[J].Large Electric Machine,2002,(1):8-12.
[10]鲍棋铭,高乃奎,马小芹.大型发电机主绝缘老化的热分析研究[J].中国电机工程学报,2003,23(7):99-101.Bao Qiming,Gao Naikui,Ma Xiaoqin.Study on the aging of stator insulation of large generators using thermoanalysis[J].Proceedings of the CSEE,2003,23(7):99-101.
[11]段小田.双馈风电机组发电机磁场与温度场分析[D].乌鲁木齐:新疆大学,2011.Duan Xiaotian.Magnetic Field and Temperature Field Analysis of Doubly-fed Induction Generator[D].Urumqi:Xinjiang University,2011.
[12]李俊卿,王喜梅.双馈电机转子绕组匝间短路电磁力计算[J].电力科学与工程,2012,28(10):6-11.Li Junqing,Wang Ximei.Electromagnetic Force Calculation of Doubly-fed Induction Generator with Rotor Turn-to-turn Short-circuit[J].Electric Power Science and Engineering,2012,28(10):6-11.
[2]李爽.双馈式风力发电机转子绕组匝间短路故障研究[D].北京:华北电力大学,2012.Li Shuang.The Research of DFIG Rotor Winding Inter-turn Short-circuit Fault[D].Beijing:North China Electric Power University,2012.
[3]栗然,王倩,卢云.Crowbar阻值对双馈感应发电机低电压穿越特性的影响[J].电力自动化设备,2014,34(4):101-107.Li Ran,Wang Qian,Lu Yun.Impact of Crowbar resistance on low voltage ride through of DFIG[J].Electric Power Automation Equipment,2014,34(4):101-107.
[4]张曼,姜惠兰.基于撬棒并联动态电阻的自适应双馈风力发电机低电压穿越[J].电工技术学报,2014,29(2):271-278.Zhang Man,Jiang Huilan.Adaptive Low Voltage Ride-Through of Doubly-Fed Induction Generators Based on Crowbar with a Parallel Dynamic Resistor[J].Transactions of China Electrotechnical Society,2014,29(2):271-278.
[5]邹和平,于芃,周玮,等.基于超级电容器储能的双馈风力发电机低电压穿越研究[J].电力系统保护与控制,2012,40(10):48-52.Zou Heping,Yu Peng,Zhou Wei,et al.Study on the low voltage ride through of doubly fed wind generator based on the supercapacitor storage[J].Power System Protection and Control,2012,40(10):48-52.
[6]Molinas M,Suul J A,Undeland T.Low Voltage Ride Through of Wind Farms With Cage Generators:STATCOM Versus SVC[J].IEEE Transactions on Power Electronics,2008,23(3):1104-1117.
[7]张建忠,熊良根,杭俊,等.DFIG风电机组串联耦合补偿低压穿越研究[J].电网技术,2014,38(1):67-73.Zhang Jianzhong,Xiong Lianggen,Hang Jun.Low Voltage Ride Through for DFIG With Series Coupled Compensation[J].Power System Technology,2014,38(1):67-73.
[8]毕小玉,田慕琴,宋建成,等.主通风机电动机绝缘状态监测及故障诊断方法研究[J].工矿自动化,2013,39(9):31-36.Bi Xiaoyu,Tian Muqin,Song Jiancheng,et al.Research of insulation condition monitoring and fault diagnosing method of motor of mine main ventilator[J].Industry and Mine Automation,2013,39(9):31-36.
[9]王延安,侯云鹏,李伟力.大型水轮发电机定子绕组内股线绝缘热老化下的定子温度场计算[J].大电机技术,2002,(1):8-12.Wang Yan’an,Hou Yunpeng,Li Weili.Stator Temperature Fields Calculation of Large Hydrogenerator after Interturn Insulation Aging of Stator Wings[J].Large Electric Machine,2002,(1):8-12.
[10]鲍棋铭,高乃奎,马小芹.大型发电机主绝缘老化的热分析研究[J].中国电机工程学报,2003,23(7):99-101.Bao Qiming,Gao Naikui,Ma Xiaoqin.Study on the aging of stator insulation of large generators using thermoanalysis[J].Proceedings of the CSEE,2003,23(7):99-101.
[11]段小田.双馈风电机组发电机磁场与温度场分析[D].乌鲁木齐:新疆大学,2011.Duan Xiaotian.Magnetic Field and Temperature Field Analysis of Doubly-fed Induction Generator[D].Urumqi:Xinjiang University,2011.
[12]李俊卿,王喜梅.双馈电机转子绕组匝间短路电磁力计算[J].电力科学与工程,2012,28(10):6-11.Li Junqing,Wang Ximei.Electromagnetic Force Calculation of Doubly-fed Induction Generator with Rotor Turn-to-turn Short-circuit[J].Electric Power Science and Engineering,2012,28(10):6-11.