瞬时对称分量法在负序电流检测中的应用与实现
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摘要
针对传统对称分量法无法对汽轮发电机组不对称故障进行瞬时分析的不足,根据改进型瞬时对称分量法的原理思路,结合以CompactDAQ为硬件基础的LabVIEW数据采集监测平台,通过编程构建了瞬时负序电流的提取方法,同时发现了该瞬时对称分量法在应用于实际数据采集平台时所带来的不可避免的纹波误差。针对相应计算环节进行滤波处理后,最终实现了对于电力系统不对称故障中负序电流量的实时检测。利用实时电量模拟输出仿真平台,验证了该方法具有检测结果精度高、实时性好的优点,从而证明了基于瞬时负序电流量计算、检测思路的Lab VIEW设计方法可实际运用于测量现场中。
In view of the fact that the traditional symmetrical component method can not analyze the asymmetrical fault of turbo generator instantaneously, according to the principle of improved instantaneous symmetrical component method, combined with LabVIEW data acquisition and monitoring platform based on CompactDAQ,the extraction method of instantaneous negative sequence current is constructed by programming, and the inevitable ripple error caused by the instantaneous symmetrical component method when applied in the actual data acquisition platform is found. After filtering the corresponding calculation link, the real-time detection of the negative sequence current in the asymmetrical fault of power system is realized finally. By using the platform of real-time electric quantity simulation, it is verified that the designed method has high detection accuracy and good real-time performance, which proves that the LabVIEW design method based on the calculation and detection method of the instantaneous negative sequence current can be applied to the measurement field.
In view of the fact that the traditional symmetrical component method can not analyze the asymmetrical fault of turbo generator instantaneously, according to the principle of improved instantaneous symmetrical component method, combined with LabVIEW data acquisition and monitoring platform based on CompactDAQ,the extraction method of instantaneous negative sequence current is constructed by programming, and the inevitable ripple error caused by the instantaneous symmetrical component method when applied in the actual data acquisition platform is found. After filtering the corresponding calculation link, the real-time detection of the negative sequence current in the asymmetrical fault of power system is realized finally. By using the platform of real-time electric quantity simulation, it is verified that the designed method has high detection accuracy and good real-time performance, which proves that the LabVIEW design method based on the calculation and detection method of the instantaneous negative sequence current can be applied to the measurement field.
引文
[1]孙同利,孙志宇,石建飞,等.大型汽轮发电机负序电流的分析与计算[J].黑龙江八一农垦大学学报,2014,26(6):101-103.
[2]董传友.大型核电汽轮发电机短路故障瞬态负序电流分析[J].哈尔滨理工大学学报,2015,20(3):97-100.
[3]朱跃杰,赵伟,刘明慧.大型汽轮发电机负序电流的危害与计算方法分析[J].上海电气技术,2012,5(3):37-39.
[4]张鹏鹏.大型半速汽轮发电机不对称短路及其负序分量的研究[D].哈尔滨:哈尔滨理工大学,2015.
[5]张志文,李晓海,张洪浩,等.基于FBD法的基波正负序电流实时检测方法[J].电力系统自动化,2012,36(6).
[6]袁旭峰,程时杰,文劲宇.改进瞬时对称分量法及其在正负序电量检测中的应用[J].中国电机工程学报,2008,28(1):52-58.
[7]方芳,杨士元,侯新国,等.一种计算负序电流的新方法[J].武汉理工大学学报,2009,33(5):872-875.
[8]周鹏.精通LabVIEW信号处理[M].北京:清华大学出版社,2013.
[9]张文生.基于MATLAB语言的负序电流通用计算法[J].东北电力技术,2003(11):37-38,48.
[10]王洪泽.发电机三相电流不平衡时负序电流近似计算的探讨[J].大电机技术,1976,12(3):10-24.
[11]水利电力部.关于补充规定同期发电机和同期调相机不平衡电流允许值的技术通报[R].北京:水利电力部,1963.
[12]阎静涛.一起负序电流损坏发电机转子事故的分析及检修[J].山西电力,2003(S1):29-32.
[2]董传友.大型核电汽轮发电机短路故障瞬态负序电流分析[J].哈尔滨理工大学学报,2015,20(3):97-100.
[3]朱跃杰,赵伟,刘明慧.大型汽轮发电机负序电流的危害与计算方法分析[J].上海电气技术,2012,5(3):37-39.
[4]张鹏鹏.大型半速汽轮发电机不对称短路及其负序分量的研究[D].哈尔滨:哈尔滨理工大学,2015.
[5]张志文,李晓海,张洪浩,等.基于FBD法的基波正负序电流实时检测方法[J].电力系统自动化,2012,36(6).
[6]袁旭峰,程时杰,文劲宇.改进瞬时对称分量法及其在正负序电量检测中的应用[J].中国电机工程学报,2008,28(1):52-58.
[7]方芳,杨士元,侯新国,等.一种计算负序电流的新方法[J].武汉理工大学学报,2009,33(5):872-875.
[8]周鹏.精通LabVIEW信号处理[M].北京:清华大学出版社,2013.
[9]张文生.基于MATLAB语言的负序电流通用计算法[J].东北电力技术,2003(11):37-38,48.
[10]王洪泽.发电机三相电流不平衡时负序电流近似计算的探讨[J].大电机技术,1976,12(3):10-24.
[11]水利电力部.关于补充规定同期发电机和同期调相机不平衡电流允许值的技术通报[R].北京:水利电力部,1963.
[12]阎静涛.一起负序电流损坏发电机转子事故的分析及检修[J].山西电力,2003(S1):29-32.