基于TLS-ESPRIT算法和综合影响指标的直流调制信号研究
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摘要
直流调制信号对调制效果有重要的影响,为了选取合理调制信号以提升系统的暂态稳定性,提出一种基于总体最小二乘–旋转矢量不变技术算法(TLS-ESPRIT)和综合影响指标选取调制信号监测点的新方法,首先通过TLS-ESPRIT辨识扰动后预选监测点功率波动幅值,再综合考虑交流和直流的影响,定义综合影响指标并制定调制信号选取策略表。运用PSD-BPA程序,对实际电网模型进行仿真,结果表明该方法所选取输入信号明显优于其他预选信号,具有良好可行性,并通过改变系统结构证明了其鲁棒性。
DCM signals can significantly influence the modulation effect. In order to select suitable DCM signals to improve the transient stability of power system,a novel method based on total least squares-estimation of signal parameters via rotational invariance techniques and comprehensive affecting index is proposed to select the best DCM signal.Firstly,power fluctuation amplitudes of preselected monitoring points are identified by TLS-ESPRIT. Then,the comprehensive affecting index and DCM signal selection strategy table are put forward,taking into account the influence of DC lines as well as interconnected AC lines. The simulation is conducted in real power grid models through adopting PSD-BPA,which shows the selected DCM signal is better than other preselected signals and this method has good feasibility. Meanwhile,the robustness of the proposed method is verified by changing system structures.
DCM signals can significantly influence the modulation effect. In order to select suitable DCM signals to improve the transient stability of power system,a novel method based on total least squares-estimation of signal parameters via rotational invariance techniques and comprehensive affecting index is proposed to select the best DCM signal.Firstly,power fluctuation amplitudes of preselected monitoring points are identified by TLS-ESPRIT. Then,the comprehensive affecting index and DCM signal selection strategy table are put forward,taking into account the influence of DC lines as well as interconnected AC lines. The simulation is conducted in real power grid models through adopting PSD-BPA,which shows the selected DCM signal is better than other preselected signals and this method has good feasibility. Meanwhile,the robustness of the proposed method is verified by changing system structures.
引文
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[13]郑希云,李兴源,王渝红.基于混沌优化算法的PSS和直流调制的协调优化[J].电工技术学报,2010,25(5):170-175.
[14]李鹏,吴小辰,张尧.等.南方电网多直流调制控制的交互影响与协调[J].电力系统自动化,2007,31(21):90-93.Li Peng,Wu Xiaochen,Zhang Yao,et al.Interaction and coordination of modulation controllers of multi-infeed HVDC in CSG[J].Automation of Electric Power Systems,2007,31(21):90-93.
[15]李天云,祝磊,党国营.等.总体最小二乘–旋转矢量不变技术在电压闪变参数提取中的应用[J].电网技术,2009,33(13):58-63.
[16]黄奂,黄阳,陈邕安.基于奇异值分解和TLS-ESPRIT的电能质量扰动信号检测方法[J].电测与仪表,2014,51(1):64-70.
[17]聂永辉,刘彦臣,张立艳.TLS—ESPRIT技术在电力系统谐波检测的应用[J].电力系统及其自动化学报,2010,22(2):129-133.
[18]中国版BPA暂态稳定程序用户手册[Z].
[2]Masatoshi S,Atsuyuki K,Hideo T.Application of Multi-variable Control for Automatic Frequency Controller of HVDC Transmission Systems[J].IEEE Trans on Power Delivery,1994,9(2):1063-1068.
[3]Pilotto L A S,Szechtman M,Djey A,et al.Synchronizing and Damping Torque Modulation Controllers for Multi-infeed HVDC Systems[J].IEEE Trans on Power Delivery,1995,10(3):109-119.
[4]谢惠藩,张尧,夏成军,等.交直流互联电网直流功率调制相关问题[J].电网技术,2009,33(4):43-48.Xie Huifan,Zhang Yao,Xia Chengjun,et al.Issues related to DC power modulation in AC/DC hybrid system[J].Power System Technology,1995,33(4):43-48.
[5]朱玲,王晓茹,卢岑岑,等.基于BPA的大电网紧急直流功率支援策略研究[J].电力系统保护与控制,2013,41(23):139-144.Zhu Ling,Wang Xiaoru,Lu Cengceng,et al.Research of emergency DC power support strategies for large-scale power grid based on PSDBPA[J].Power System Protection and Control,2013,41(23):139-144.
[6]徐梅梅,李兴源,王渝红,等.德宝直流调制对四川电网阻尼特性的影响[J].电力系统保护与控制,2010,(23):141-146.Xu Meimei,Li Xingyuan,Wang Yuhong,et al.Impact on the damping characteristics of sichuan power grid by Debao DC modulation[J].Power System Protection and Control,2010,(23):141-146.
[7]刘红超,李兴源.基于PRONY辨识的交直流并联输电系统直流阻尼控制的研究[J].中国电机工程学报,2002,22(7):54-57.Liu Hongchao,Li Xing-yuan.Study of DC damping control in AC/DC transmission systems based on prony method[J].Proceedings of the CSEE,2002,22(7):54-57.
[8]何剑,孙华东,郭剑波.等.直流功率调制抑制交流联络线随机功率波动的研究[J].中国电机工程学报,2013,33(25):93-98.He Jian,Sun Huadong,Guo Jianbo,et al.Suppressing AC tie-line stochastic power fluctuation by HVDC power modulation control[J].Proceedings of the CSEE,2013,33(25):93-98.
[9]吴华坚,王渝红,李兴源,等.基于综合性能指标的交直流混合系统直流调制研究[J].电力系统保护与控制,2010,38(22):68-73.Wu Huajian,Wang Yuhong,Li Xingyuan,et al.Study on DC modulation for AC/DC hybrid transmission system based on comprehensive performance index[J].Power System Protection and Control,2010,38(22):68-73.
[10]荆勇,杨晋柏,李柏青,等.直流调制改善交直流混联系统暂态稳定性的研究[J].电网技术,2004,28(10):1-4.Jing Yong,Yang Jinbai,LI Bai-qing,et al.Research on improving transient stability of AC/DC hybrid system by HVDC modulation[J].Power System Technology,2004,28(10):1-4.
[11]朱红萍,罗隆福.直流调制策略改善交直流混联系统的频率稳定性研究[J].中国电机工程学报,2012,32(16):36-43.Zhu Hongping,Luo Longfu.Improving frequency stability of parallel AC-DC hybrid systems by power modulation strategy of HVDC link[J].Proceedings of the CSEE,2012,32(16):36-43.
[12]郭利娜,刘天琪,程道卫,等.直流多落点系统控制敏感点挖掘技术研究[J].电力系统保护与控制,2013,41(10):7-12.Guo Lina,Liu Tianqi,Cheng Daowei,et al.Study on digging the most sensitive control point of multi-terminal HVDC system[J].Power System Protection and Control,2013,41(10):7-12.
[13]郑希云,李兴源,王渝红.基于混沌优化算法的PSS和直流调制的协调优化[J].电工技术学报,2010,25(5):170-175.
[14]李鹏,吴小辰,张尧.等.南方电网多直流调制控制的交互影响与协调[J].电力系统自动化,2007,31(21):90-93.Li Peng,Wu Xiaochen,Zhang Yao,et al.Interaction and coordination of modulation controllers of multi-infeed HVDC in CSG[J].Automation of Electric Power Systems,2007,31(21):90-93.
[15]李天云,祝磊,党国营.等.总体最小二乘–旋转矢量不变技术在电压闪变参数提取中的应用[J].电网技术,2009,33(13):58-63.
[16]黄奂,黄阳,陈邕安.基于奇异值分解和TLS-ESPRIT的电能质量扰动信号检测方法[J].电测与仪表,2014,51(1):64-70.
[17]聂永辉,刘彦臣,张立艳.TLS—ESPRIT技术在电力系统谐波检测的应用[J].电力系统及其自动化学报,2010,22(2):129-133.
[18]中国版BPA暂态稳定程序用户手册[Z].