为研究南方电网500 k V东莞站首个链式35 k V±200 MVA STATCOM在各种主网故障情况下暂态响应的能力和情况,理论计算了500 k V东莞站附近主要枢纽变电站短路故障对其220 k V母线电压的影响;在PSCAD/EMTDC仿真平台上编写了数据处理程...为研究南方电网500 k V东莞站首个链式35 k V±200 MVA STATCOM在各种主网故障情况下暂态响应的能力和情况,理论计算了500 k V东莞站附近主要枢纽变电站短路故障对其220 k V母线电压的影响;在PSCAD/EMTDC仿真平台上编写了数据处理程序,根据STATCOM投运3 a来500 k V东莞站及周边强联系的枢纽变电站发生典型的、严重接地短路或者相间短路故障的运行数据,对STATCOM的响应情况进行深入分析,验证了STATCOM的进入和退出暂态的条件及策略的正确性;计算了STATCOM在系统电压暂降时实际对电网无功支撑量;结果表明STATCOM能在20 ms内正确响应,为电网暂态输送200 MVA以上的无功,对电网电压的暂停稳定有重要的支撑作用。展开更多
Climate room is an important instrument to study the icing problems in power networks,and the accuracy of the data from the climate room is under debate.There are many climate rooms in the world,but no standards about...Climate room is an important instrument to study the icing problems in power networks,and the accuracy of the data from the climate room is under debate.There are many climate rooms in the world,but no standards about the parameters of the climate room such as the room's temperature,the velocity of the wind,and the particle diameters of the water droplets etc.These parameters will influence the icing processes on the lines and insulators.This paper gave a summary of the process and the feature of atmospheric icing of power networks.The speed of the icing on a cylinder rod as a new characteristic quantity was proposed to study the de-icing problems in this paper.For the purpose to analyze the equivalence between atmospheric icing and icing in climate room,a finite element model was made based on a small climate room located in the Graduate School at Shenzhen,Tsinghua University.Through the simulation analysis for the heat transfer and flow issues,the result showed that precooling droplets were cooled into supercooled ones soon after they came into the climate room.Based on the most serious icing-speed in Hengshan,Hunan and a series of experiments,the values of some parameters in studying icing problems were proposed to better simulate the atmospheric icing in climate room.展开更多
文摘为研究南方电网500 k V东莞站首个链式35 k V±200 MVA STATCOM在各种主网故障情况下暂态响应的能力和情况,理论计算了500 k V东莞站附近主要枢纽变电站短路故障对其220 k V母线电压的影响;在PSCAD/EMTDC仿真平台上编写了数据处理程序,根据STATCOM投运3 a来500 k V东莞站及周边强联系的枢纽变电站发生典型的、严重接地短路或者相间短路故障的运行数据,对STATCOM的响应情况进行深入分析,验证了STATCOM的进入和退出暂态的条件及策略的正确性;计算了STATCOM在系统电压暂降时实际对电网无功支撑量;结果表明STATCOM能在20 ms内正确响应,为电网暂态输送200 MVA以上的无功,对电网电压的暂停稳定有重要的支撑作用。
基金Project Supported by National Natural Science Foundation of China(51077081)
文摘Climate room is an important instrument to study the icing problems in power networks,and the accuracy of the data from the climate room is under debate.There are many climate rooms in the world,but no standards about the parameters of the climate room such as the room's temperature,the velocity of the wind,and the particle diameters of the water droplets etc.These parameters will influence the icing processes on the lines and insulators.This paper gave a summary of the process and the feature of atmospheric icing of power networks.The speed of the icing on a cylinder rod as a new characteristic quantity was proposed to study the de-icing problems in this paper.For the purpose to analyze the equivalence between atmospheric icing and icing in climate room,a finite element model was made based on a small climate room located in the Graduate School at Shenzhen,Tsinghua University.Through the simulation analysis for the heat transfer and flow issues,the result showed that precooling droplets were cooled into supercooled ones soon after they came into the climate room.Based on the most serious icing-speed in Hengshan,Hunan and a series of experiments,the values of some parameters in studying icing problems were proposed to better simulate the atmospheric icing in climate room.
