为测量直流输电线路的电阻、自电感、对地电容及双极线路之间的耦合电感和电容等数据,建立了直流线路分布参数的改进模型。基于对称分量法分解双极线路模型,分别在线路受端开路和短路的状态下,在送端施加两相正序电源和零序电源,测量线...为测量直流输电线路的电阻、自电感、对地电容及双极线路之间的耦合电感和电容等数据,建立了直流线路分布参数的改进模型。基于对称分量法分解双极线路模型,分别在线路受端开路和短路的状态下,在送端施加两相正序电源和零序电源,测量线路对应的开路阻抗和短路阻抗,联立正序及零序开路阻抗和短路阻抗求解线路的分布参数。该方法已应用于±800 k V普侨特高压直流线路参数测量,现场测量结果与依据线路几何尺寸计算的结果高度一致。因此,该方法可为保护整定、线路故障定位、RTDS/EMTDC仿真提供精确的直流输电线路参数。展开更多
In order to analyze power system stability in environment of WAMS(wide area measurement system),a new steady state stability model with time-varying delay was proposed for power system.The factors of exciter and power...In order to analyze power system stability in environment of WAMS(wide area measurement system),a new steady state stability model with time-varying delay was proposed for power system.The factors of exciter and power system stabilizer with delay were introduced into analytical model.To decrease conservativeness of stability analysis,an improved Lyapunov-Krasovskii functional was constructed,and then a new delay-dependent steady state stability criterion for power system,which overcomes the disadvantages of eigenvalue computation method,was derived.The proposed model and criterion were tested on synchronous-machine infinite-bus power system.The test results demonstrate that Lyapunov-Krasovskii functional based power system stability analysis method is applicable and effective in the analysis of time delay power system stability.展开更多
文摘为测量直流输电线路的电阻、自电感、对地电容及双极线路之间的耦合电感和电容等数据,建立了直流线路分布参数的改进模型。基于对称分量法分解双极线路模型,分别在线路受端开路和短路的状态下,在送端施加两相正序电源和零序电源,测量线路对应的开路阻抗和短路阻抗,联立正序及零序开路阻抗和短路阻抗求解线路的分布参数。该方法已应用于±800 k V普侨特高压直流线路参数测量,现场测量结果与依据线路几何尺寸计算的结果高度一致。因此,该方法可为保护整定、线路故障定位、RTDS/EMTDC仿真提供精确的直流输电线路参数。
基金Projects(60425310,60974026) supported by the National Natural Science Foundation of ChinaProject(200805330004) supported by the Doctor Subject Foundation of China+1 种基金Projects(NCET-06-0679) supported by Program for New Century Excellent Talents in UniversityProject(08JJ1010) supported by the Natural Science Foundation of Hunan Province,China
文摘In order to analyze power system stability in environment of WAMS(wide area measurement system),a new steady state stability model with time-varying delay was proposed for power system.The factors of exciter and power system stabilizer with delay were introduced into analytical model.To decrease conservativeness of stability analysis,an improved Lyapunov-Krasovskii functional was constructed,and then a new delay-dependent steady state stability criterion for power system,which overcomes the disadvantages of eigenvalue computation method,was derived.The proposed model and criterion were tested on synchronous-machine infinite-bus power system.The test results demonstrate that Lyapunov-Krasovskii functional based power system stability analysis method is applicable and effective in the analysis of time delay power system stability.
