电力系统故障对水轮发电机组转子-轴承系统稳定性影响分析
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摘要
为探索水电站水力、机械、电力各系统耦联条件下,水轮发电机组振动的动态特性,本文运用模块化建模方式,利用MATLAB/SIMULINK仿真工具建立了水力发电系统各子系统的模型,然后将各个元件模型搭建成耦合仿真系统。据此对电力系统短路故障进行仿真模拟,在计算时步中对电磁参数-励磁电流及发电机转速实时更新,通过不平衡磁拉力建立起水机电系统和转子-轴承系统的耦合,从而分析电力系统不同短路故障对转子动力特性的影响。结果表明,电力系统是否保持稳定对发电机组转子-轴承系统有着重要影响,其中三相短路对其稳定性的影响最为显著,只要及时切除故障线路,可以有效避免机组产生剧烈振动。
In order to explore the dynamic characteristics of vibration of hydroelectric generating units under the coupling conditions of hydraulic, mechanical and electrical systems of hydropower stations. This paper adopts modular modeling method, in which we established multi-precision modular model of hydro-generator subsystems by using software MATLAB/SIMULINK. The coupling system simulates the three-phase of the power system fault. By using the calculation method of real-time updating of electromagnetic parameters-excitation current and generator speed in time step, we develop the connection between the hydraulic-mechanical-electrical coupling system and rotor-bearing system for hydroelectric set by the unbalanced magnetic pull(UMP), to analyze the vibration characteristics of rotor-bearing system for hydroelectric set under the influence of the short-circuit fault of power system. The results show that the stability of power system has an important influence on rotor-bearing system for hydroelectric set, and the worst situation on system stability is three-phase fault in the power systems. Furthermore, timely removal of fault lines can effectively avoid the emergence of severe vibration of the hydro-generating unit.
In order to explore the dynamic characteristics of vibration of hydroelectric generating units under the coupling conditions of hydraulic, mechanical and electrical systems of hydropower stations. This paper adopts modular modeling method, in which we established multi-precision modular model of hydro-generator subsystems by using software MATLAB/SIMULINK. The coupling system simulates the three-phase of the power system fault. By using the calculation method of real-time updating of electromagnetic parameters-excitation current and generator speed in time step, we develop the connection between the hydraulic-mechanical-electrical coupling system and rotor-bearing system for hydroelectric set by the unbalanced magnetic pull(UMP), to analyze the vibration characteristics of rotor-bearing system for hydroelectric set under the influence of the short-circuit fault of power system. The results show that the stability of power system has an important influence on rotor-bearing system for hydroelectric set, and the worst situation on system stability is three-phase fault in the power systems. Furthermore, timely removal of fault lines can effectively avoid the emergence of severe vibration of the hydro-generating unit.
引文
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[2] 李光琦.电力系统分析[M].3版.北京:中国电力出版社,2007.
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[4] 卫洋波,陈婧,马震岳.抽水蓄能电站地下主副厂房振动传递途径研究[J].水利与建筑工程学报,2017,15(4):101-106.
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[8] 张雷克,马震岳,宋兵伟.水轮发电机组在不平衡磁拉力及密封力下振动特性分析[J].水电能源科学,2010,28(9):117-120.
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[12] 吴明天,谢小竹,彭彬.MATLAB电力系统设计与分析[M].北京:国防工业出版社,2003.
[13] 王晶,翁国庆,张有兵.电力系统的MATLAB/SIMULINK仿真与应用[M].西安:西安电子科技大学出版社,2008.
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[15] Guo D,Chun F,Chen D.The unbalanced magnetic pull and its effects on vibration in a three-phase generator with eccentric rotor[J].Journal of Sound and Vibration,2002,254(2):297-312.
[16] Adiletta G,Guido A R,Rossi C.Chaotic motions of a rigid rotor in short journal bearings[J].Nonlinear Dynamics,1996,10(3):251-269.
[2] 李光琦.电力系统分析[M].3版.北京:中国电力出版社,2007.
[3] 韩志勇,徐衍会,辛建波,等.水轮机组与电网耦合对电网动态稳定的影响[J].电工技术学报,2009,24(9):166-170.
[4] 卫洋波,陈婧,马震岳.抽水蓄能电站地下主副厂房振动传递途径研究[J].水利与建筑工程学报,2017,15(4):101-106.
[5] 束洪春,张加贝.水机电耦合系统建模及暂态分析[J].电力系统自动化,2008,32(13):26-30.
[6] 郑秀梅,马震岳.水电站地下厂房机墩结构动力特性分析中几点问题探讨[J].水利与建筑工程学报,2017,15(3):26-30.
[7] 汪芳宗,陈德树,何仰赞.大规模电力系统暂态稳定性实时仿真及快速判断[J].中国发电机工程学报,1993(6):13-19.
[8] 张雷克,马震岳,宋兵伟.水轮发电机组在不平衡磁拉力及密封力下振动特性分析[J].水电能源科学,2010,28(9):117-120.
[9] 于群,曹娜.MATLAB/Simulink电力系统建模与仿真[M].2版.北京:机械工业出版社,2017.
[10] 薛定宇.科学运算语言MATLAB5.3程序设计与应用[M].北京:清华大学出版社,2000.
[11] 薛定宇,陈阳泉.基于Matlab/Simulink的系统仿真技术与应用[M].北京:清华大学出版社,2002.
[12] 吴明天,谢小竹,彭彬.MATLAB电力系统设计与分析[M].北京:国防工业出版社,2003.
[13] 王晶,翁国庆,张有兵.电力系统的MATLAB/SIMULINK仿真与应用[M].西安:西安电子科技大学出版社,2008.
[14] 马震岳,董毓新.水轮发电机组动力学[M].大连:大连理工大学出版社,2003.
[15] Guo D,Chun F,Chen D.The unbalanced magnetic pull and its effects on vibration in a three-phase generator with eccentric rotor[J].Journal of Sound and Vibration,2002,254(2):297-312.
[16] Adiletta G,Guido A R,Rossi C.Chaotic motions of a rigid rotor in short journal bearings[J].Nonlinear Dynamics,1996,10(3):251-269.