电力系统强迫功率扰动源波形与大小估计
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摘要
强迫功率扰动源波形与大小对电力系统稳定性有重要影响。在电力系统原状态方程基础上,引入一个用以代表系统中实际发生扰动的虚拟扰动,以此构建扰动观测器。通过扰动观测器的输出与系统真实输出进行比较,形成残差,采用迭代算法进行求解,从而实现对系统扰动的准确估计。在此基础上,研究了不同扰动源特性对系统稳定性的影响。最后,通过时域仿真对该方法的有效性进行了验证。结果表明,该观测器能够同时实现对强迫功率扰动源和系统状态估计,随机扰动源相比规则扰动源更易引起系统的不稳定。
The waveform and magnitude of forced power disturbance source have important influence on the stability ofpower system. Based on the system's original equation of state,a virtual disturbance is introduced to represent the actu-al disturbance in the system,and a disturbance observer is constructed accordingly. The output of the disturbance ob-server is compared with the real output of the system to form a residual error,which is solved by an iterative algorithm,thus an accurate estimation of the system disturbance is realized. On this basis,the influences of different characteris-tics of disturbance sources on the system stability are studied. Finally,the validity of the proposed method is verified bytime domain simulation. It is concluded that the constructed observer can estimate both the forced power disturbancesource and the system state. Compared with the regular disturbance source,the random disturbance source is more like-ly to cause system instability.
The waveform and magnitude of forced power disturbance source have important influence on the stability ofpower system. Based on the system's original equation of state,a virtual disturbance is introduced to represent the actu-al disturbance in the system,and a disturbance observer is constructed accordingly. The output of the disturbance ob-server is compared with the real output of the system to form a residual error,which is solved by an iterative algorithm,thus an accurate estimation of the system disturbance is realized. On this basis,the influences of different characteris-tics of disturbance sources on the system stability are studied. Finally,the validity of the proposed method is verified bytime domain simulation. It is concluded that the constructed observer can estimate both the forced power disturbancesource and the system state. Compared with the regular disturbance source,the random disturbance source is more like-ly to cause system instability.
引文
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[9]边晓燕,耿艳,袁方期,等(Bian Xiaoyan,Geng Yan,Yuan Fangqi,et al).多运行方式下DFIG-PSS输入信号选取的探讨(Discussion on input signal selection of DFIG-PSS in multi-operating conditions)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2016,28(7):47-50.
[10]颜秉勇,田作华,施颂椒,等(Yan Bingyong,Tian Zuohua,Shi Songjiao,et al).基于故障跟踪估计器的非线性时滞系统故障诊断(Fault diagnosis for nonlinear time-delay systems based on fault tracking approximator)[J].控制与决策(Control and Decision),2009,24(1):133-136.
[11]颜秉勇,田作华,施颂椒,等(Yan Bingyong,Tian Zuohua,Shi Songjiao,et al).高压直流输电系统故障诊断新方法(A new method for diagnosis in HVDC systems)[J].电力系统自动化(Automation of Electric Power Systems),2007,31(16):57-61.
[12]汤涌(Tang Yong).电力系统强迫功率振荡的基础理论(Fundamental theory of forced power oscillation in power system)[J].电网技术(Power System Technology),2006,30(10):29-33.
[2]汤凡,刘天琪,李兴源(Tang Fan,Liu Tianqi,Li Xing-yuan).大型水电机组与交直流互联电网的耦合作用(Analysis on coupling of large hydraulic turbine with AC-DC interconnected power system)[J].电网技术(PowerSystem Technology),2011,35(3):38-43.
[3]董超,云雷,刘涤尘,等(Dong Chao,Yun Lei,Liu Di-chen,et al).原动机周期性扰动引发强迫功率振荡特性研究(Research on the properties of forced oscilla-tions caused by turbine's periodic disturbance)[J].电网与清洁能源(Power Systems and Clean Energy),2012,28(4):35-41,46.
[4]Yu Yiping,Min Yong,Chen Lei,et al.The disturbancesource identification of forced power oscillation caused bycontinuous cyclical load[C]//4th International Conferenceon Electric Utility Deregulation and Restructuring andPower Technologies.Weihai,China,2011:308-313.
[5]余一平,闵勇,陈磊,等(Yu Yiping,Min Yong,Chen Lei,et al).周期性负荷扰动引发强迫功率振荡分析(Analy-sis of forced power oscillation caused by continuous loaddisturbances)[J].电力系统自动化(Automation of Elec-tric Power Systems),2010,34(6):7-11,47.
[6]杨毅强,刘天琪,李兴源,等(Yang Yiqiang,Liu Tianqi,Li Xingyuan,et al).电力系统强迫功率振荡的等效电路定位分析法(An equivalent circuit approach to locatesource of power system forced power oscillation)[J].电网技术(Power System Technology),2012,36(11):101-108.
[7]胡伟,林涛,高玉喜,等(Hu Wei,Lin Tao,Gao Yuxi,et al).基于耗散功率的区域电网强迫功率振荡扰动源定位(Disturbance source location of forced power oscilla-tion in regional power grid based on dissipation power)[J].高电压技术(High Voltage Engineering),2012,38(4):1006-1011.
[8]李啸骢,王占颖,徐俊华,等(Li Xiaocong,Wang Zhan-ying,Xu Junhua,et al).基于实测相频特性的电力系统稳定器参数设计(Design of parameters for power system stabilizer based on measured phase frequency characteristics)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2017,29(3):28-34.
[9]边晓燕,耿艳,袁方期,等(Bian Xiaoyan,Geng Yan,Yuan Fangqi,et al).多运行方式下DFIG-PSS输入信号选取的探讨(Discussion on input signal selection of DFIG-PSS in multi-operating conditions)[J].电力系统及其自动化学报(Proceedings of the CSU-EPSA),2016,28(7):47-50.
[10]颜秉勇,田作华,施颂椒,等(Yan Bingyong,Tian Zuohua,Shi Songjiao,et al).基于故障跟踪估计器的非线性时滞系统故障诊断(Fault diagnosis for nonlinear time-delay systems based on fault tracking approximator)[J].控制与决策(Control and Decision),2009,24(1):133-136.
[11]颜秉勇,田作华,施颂椒,等(Yan Bingyong,Tian Zuohua,Shi Songjiao,et al).高压直流输电系统故障诊断新方法(A new method for diagnosis in HVDC systems)[J].电力系统自动化(Automation of Electric Power Systems),2007,31(16):57-61.
[12]汤涌(Tang Yong).电力系统强迫功率振荡的基础理论(Fundamental theory of forced power oscillation in power system)[J].电网技术(Power System Technology),2006,30(10):29-33.