The performance of complementary feeders,running in parallel,can be significantly improved by installing static transfer switches(STSs) at critical locations. We develop the STS control logic,which transfers the criti...The performance of complementary feeders,running in parallel,can be significantly improved by installing static transfer switches(STSs) at critical locations. We develop the STS control logic,which transfers the critical load from the preferred feeder to the alternate feeder when a voltage sag or a fault occurs on the preferred feeder. A forced commutation technique is proposed and implemented to turn off the preferred feeders' thyristor,thus avoiding cross current to flow and minimizing the transfer time. Simulation results show that the forced commutation technique is more effective as compared to the recently pro-posed time delay technique for STS operation. Two different feeders,namely New Exchange,the preferred feeder,and Sector I-10/2,the alternate feeder of Islamabad Electric Supply COmpany(IESCO),Pakistan,have been selected for case studies. The software PSCAD/EMTDC professional package has been used for simulation.展开更多
空管系统为全国民用航空提供空中交通服务、通信导航监视、航空气象、航行情报服务,是民航运行的枢纽。供电设备故障会严重影响空中交通安全。为确保设备的供电安全,从航管小区供配电系统设计出发,提出基于双市电双油机供电、不间断电源...空管系统为全国民用航空提供空中交通服务、通信导航监视、航空气象、航行情报服务,是民航运行的枢纽。供电设备故障会严重影响空中交通安全。为确保设备的供电安全,从航管小区供配电系统设计出发,提出基于双市电双油机供电、不间断电源(Uninterruptible Power Supply,UPS)并机双路供电、分布式静态转换开关(Static Transfer Switch,STS)供电以及直流应急供电的多重冗余供电体系。在空管设备末端供电设计方面,针对设备结构和管制席位设备及功能,提出优化的冗余供电设计方案。展开更多
文摘The performance of complementary feeders,running in parallel,can be significantly improved by installing static transfer switches(STSs) at critical locations. We develop the STS control logic,which transfers the critical load from the preferred feeder to the alternate feeder when a voltage sag or a fault occurs on the preferred feeder. A forced commutation technique is proposed and implemented to turn off the preferred feeders' thyristor,thus avoiding cross current to flow and minimizing the transfer time. Simulation results show that the forced commutation technique is more effective as compared to the recently pro-posed time delay technique for STS operation. Two different feeders,namely New Exchange,the preferred feeder,and Sector I-10/2,the alternate feeder of Islamabad Electric Supply COmpany(IESCO),Pakistan,have been selected for case studies. The software PSCAD/EMTDC professional package has been used for simulation.
文摘空管系统为全国民用航空提供空中交通服务、通信导航监视、航空气象、航行情报服务,是民航运行的枢纽。供电设备故障会严重影响空中交通安全。为确保设备的供电安全,从航管小区供配电系统设计出发,提出基于双市电双油机供电、不间断电源(Uninterruptible Power Supply,UPS)并机双路供电、分布式静态转换开关(Static Transfer Switch,STS)供电以及直流应急供电的多重冗余供电体系。在空管设备末端供电设计方面,针对设备结构和管制席位设备及功能,提出优化的冗余供电设计方案。
