The conventional fault analysis method based on symmetrical components supposes that the three-phase parameters of un-transposed transmission line are symmetrical in case of fault. The errors caused by the method with...The conventional fault analysis method based on symmetrical components supposes that the three-phase parameters of un-transposed transmission line are symmetrical in case of fault. The errors caused by the method with the symmetrical distributed parameter circuit model as the equivalent circuit of the un-transposed ultra high voltage(UHV) transmission line were studied under both normal operation and fault,and the corresponding problems arising were pointed out. By contrast with electromagnetic transient and power electronics(EMTPE) simulation results with the asymmetrical distributed parameter circuit model of un-transposed line, it is shown that the conventional method cannot show the existence of negative and zero sequences before fault happening and there are many errors on voltage and current after fault happening which are different with fault types. The error ranges of voltage and current are 2.13%-81.13% and -7.82%- -86.15%, respectively.展开更多
半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验...半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验路径方案,构建了点对网的真型线路试验系统。采用电磁暂态计算程序(EM TPE)对真型线路的稳态特性进行了研究,分析了沿线装置和线路参数不均匀等因素的影响;研究了半波长真型线路试验系统的过电压特性,并提出过电压的控制措施。研究结果表明:采用多段750 k V线路串联而成的真型线路,其稳态特性与均匀半波长线路基本相符;采用750 k V变电站内避雷器,可以将真型线路试验过电压控制在允许水平内。展开更多
电力系统电磁暂态及电力电子仿真程序 (ElectroMagnet Transients and Power Electronics Program ,EMTPE)是用于电力与电力电子装置的科研、设计和运行的电磁暂态分析工具。作为该工具的组成部分 ,要求与EMTPE计算程序配套的图形输出...电力系统电磁暂态及电力电子仿真程序 (ElectroMagnet Transients and Power Electronics Program ,EMTPE)是用于电力与电力电子装置的科研、设计和运行的电磁暂态分析工具。作为该工具的组成部分 ,要求与EMTPE计算程序配套的图形输出程序提供直观快捷的计算结果处理、显示和分析功能 ,以图形方式显示各种类型输出变量随时间或频率变化的波形和曲线 ,并具备数值分析及图形后处理等多项功能。为满足这些功能要求并结合实际工程需要 ,作者采用可视化面向对象技术 ,在 Windows9x/ NT操作系统平台上开发了基于 Microsoft Visual C++5 .0的EMTPE通用图形输出软件 (Plotting Transient Curve,PTC)。在此简述 PTC1.0软件的设计与实现要点 。展开更多
文摘The conventional fault analysis method based on symmetrical components supposes that the three-phase parameters of un-transposed transmission line are symmetrical in case of fault. The errors caused by the method with the symmetrical distributed parameter circuit model as the equivalent circuit of the un-transposed ultra high voltage(UHV) transmission line were studied under both normal operation and fault,and the corresponding problems arising were pointed out. By contrast with electromagnetic transient and power electronics(EMTPE) simulation results with the asymmetrical distributed parameter circuit model of un-transposed line, it is shown that the conventional method cannot show the existence of negative and zero sequences before fault happening and there are many errors on voltage and current after fault happening which are different with fault types. The error ranges of voltage and current are 2.13%-81.13% and -7.82%- -86.15%, respectively.
文摘半波长交流输电线路的特性与常规线路差异较大,目前尚没有实际工程应用。在工程实施前,开展真型线路试验对半波长输电的特性进行验证十分必要。该文对采用多段750 k V线路串联形成的半波长真型线路进行了研究,提出了半波长真型线路试验路径方案,构建了点对网的真型线路试验系统。采用电磁暂态计算程序(EM TPE)对真型线路的稳态特性进行了研究,分析了沿线装置和线路参数不均匀等因素的影响;研究了半波长真型线路试验系统的过电压特性,并提出过电压的控制措施。研究结果表明:采用多段750 k V线路串联而成的真型线路,其稳态特性与均匀半波长线路基本相符;采用750 k V变电站内避雷器,可以将真型线路试验过电压控制在允许水平内。
