互联系统交流联络线随机功率波动分析(一)频域特征与原因初探
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摘要
控制区域间交流联络线功率存在自然波动以及因各种扰动引起的波动,波动幅值过大时,可能引起系统稳定及电压问题,影响互联电网的安全稳定运行。文中基于某大区互联系统交流联络线功率波动的实际数据,利用频域分析和自相关分析方法对联络线功率波动进行全面分析,发现功率波动中周期在110s左右的分量比较突出这一特点。产生该现象的原因是电网区域控制偏差(ACE)的实时调整,即ACE实时调整环节虽能显著抑制ACE中的低频慢速分量,但对周期在110s左右的分量有放大作用,但综合来看ACE实时调整对抑制联络线功率波动是有利的。最后,通过在某大区实际开展的试验进行了验证,退出ACE实时调整后周期在110s左右的分量显著减小,而低频分量增大。该研究为深入分析大区互联系统交流联络线随机功率波动机理和控制措施改进提供了依据。
There do exist natural power fluctuations and the fluctuations caused by various disturbances on the alternating current(AC) tie-lines among control areas.But large-magnitude power fluctuations on the tie-lines may threaten the security of the system.Based on the practical data of power fluctuations on a tie-line between two large power systems,the frequency-domain analysis method and the autocorrelation analysis method are used to analyze stochastic power fluctuations of tie-lines.It is found that the component with the period about 110 s is prominent in the fluctuations.This is caused by the real-time area control error(ACE) regulation of the power system,i.e.the real-time ACE regulation can reduce the magnitude of the low-frequency slow component in the area control error,but it may amplify the area control error with the period around 110 s.The reason is verified with an experiment in practical systems.When the real-time ACE regulation stops,the component with the period about 110 s is significantly reduced while the low-frequency component increases.The study provides basis for analysis of tie-line power fluctuation mechanism and the improvement of tie-line control.
There do exist natural power fluctuations and the fluctuations caused by various disturbances on the alternating current(AC) tie-lines among control areas.But large-magnitude power fluctuations on the tie-lines may threaten the security of the system.Based on the practical data of power fluctuations on a tie-line between two large power systems,the frequency-domain analysis method and the autocorrelation analysis method are used to analyze stochastic power fluctuations of tie-lines.It is found that the component with the period about 110 s is prominent in the fluctuations.This is caused by the real-time area control error(ACE) regulation of the power system,i.e.the real-time ACE regulation can reduce the magnitude of the low-frequency slow component in the area control error,but it may amplify the area control error with the period around 110 s.The reason is verified with an experiment in practical systems.When the real-time ACE regulation stops,the component with the period about 110 s is significantly reduced while the low-frequency component increases.The study provides basis for analysis of tie-line power fluctuation mechanism and the improvement of tie-line control.
引文
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[3]高宗和,陈刚,杨军峰,等.特高压互联电网联络线功率控制:(一)AGC控制策略[J].电力系统自动化,2009,33(15):51-55.GAO Zonghe,CHEN Gang,YANG Junfeng,et al.Active power control for tie-lines in UHV interconnected power grid:Part one AGC control strategies[J].Automation of Electric Power Systems,2009,33(15):51-55.
[4]高宗和,陈刚,滕贤亮,等.特高压互联电网联络线功率控制(二):AGC性能评价[J].电力系统自动化,2009,33(16):61-64.GAO Zonghe,CHEN Gang,TENG Xianliang,et al.Active power control for tie-lines in UHV interconnected power grid:Part two AGC performance assessment[J].Automation of Electric Power Systems,2009,33(16):61-64.
[5]刘辉,吴涛,李群炬,等.特高压交流示范工程功率摆动机理分析[J].中国电力,2010,43(7):9-13.LIU Hui,WU Tao,LI Qunju,et al.Power swing mechanism analysis of UHV AC pilot project[J].Electric Power,2010,43(7):9-13.
[6]汤涌,孙华东,易俊,等.两大区互联系统交流联络线功率波动机制与峰值计算[J].中国电机工程学报,2010,30(19):1-6.TANG Yong,SUN Huadong,YI Jun,et al.AC tie-line powerfluctuation mechanism and peak value calculation for two-area interconnected power systems[J].Proceedings of the CSEE,2010,30(19):1-6.
[7]陈磊,刘辉,闵勇,等.两区域互联系统联络线功率波动理论分析[J].电网技术,2011,35(10):53-58.CHEN Lei,LIU Hui,MIN Yong,et al.Theoretical analysis on tie-line power oscillation of two-area interconnected system[J].Power System Technology,2011,35(10):53-58.
[8]汤涌,何剑,孙华东,等.两区域互联系统交流联络线随机功率波动机制及幅值估计[J].中国电机工程学报,2012,32(19):30-35.TANG Yong,HE Jian,SUN Huadong,et al.AC tie-line stochastic power fluctuation mechanism and amplitude estimation for two-area interconnected power systems[J].Proceedings of the CSEE,2012,32(19):30-35.
[9]陆光华.随机信号处理[M].西安:西安电子科技大学出版社,2002.
[10]电力系统调频与自动发电控制编委会.电力系统调频与自动发电控制[M].北京:中国电力出版社,2006.
[11]徐琰,朱翠兰,曾伟民.华中电网AGC分层控制模式的探讨[J].电力系统自动化,2000,24(22):45-47.XU Yan,ZHU Cuilan,ZENG Weimin.Study on hierarchical AGC mode in Central China power grid[J].Automation of Electric Power Systems,2000,24(22):45-47.
[12]江木,吴文传,张伯明,等.特高压联网下AGC协调控制策略仿真[J].电力系统自动化,2010,34(14):75-78.JIANG Mu,WU Wenchuan,ZHANG Boming,et al.Simulation of an AGC coordinated control strategy for ultra-high voltage interconnected power system[J].Automation of Electric Power Systems,2010,34(14):75-78.
[13]张小白,孙素琴,滕贤亮,等.基于多区域的AGC多目标协调控制方法[J].电力系统自动化,2010,34(16):55-57.ZHANG Xiaobai,SUN Suqin,TENG Xianliang,et al.A multi-area based AGC multi-objective coordinated control method[J].Automation of Electric Power Systems,2010,34(16):55-57.
[14]刘新东,陈焕远,姚程.基于非线性方法抑制特高压联络线功率波动的控制策略仿真[J].电力自动化设备,2012,32(4):92-95.LIU Xindong,CHEN Huanyuan,YAO Cheng.Simulation of power control strategy based on nonlinear method for UHV tie line[J].Electric Power Automation Equipment,2012,32(4):92-95.