Purpose–Auxiliary power system is an indispensable part of the train;the auxiliary systems of both electric locomotives and EMUs mainly are powered by one of the two ways,which are either from auxiliary windings of t...Purpose–Auxiliary power system is an indispensable part of the train;the auxiliary systems of both electric locomotives and EMUs mainly are powered by one of the two ways,which are either from auxiliary windings of traction transformers or from DC-link voltage of traction converters.Powered by DC-link voltage of traction converters,the auxiliary systems were maintained of uninterruptable power supply with energy from electric braking.Meanwhile,powered by traction transformers,the auxiliary systems were always out of power while passing the neutral section of power supply grid and control system is powered by battery at this time.Design/methodology/approach–Uninterrupted power supply of auxiliary power system powered by auxiliary winding of traction transformer was studied.Failure reasons why previous solutions cannot be realized are analyzed.An uninterruptable power supply scheme for the auxiliary systems powered by auxiliary windings of traction transformers is proposed in this paper.The validity of the proposed scheme is verified by simulation and experimental results and on-site operation of an upgraded HXD3C type locomotive.This scheme is attractive for upgrading practical locomotives with the auxiliary systems powered by auxiliary windings of traction transformers.Findings–This scheme regenerates braking power supplied to auxiliary windings of traction transformers while a locomotive runs in the neutral section of the power supply grid.Control objectives of uninterrupted power supply technology are proposed,which are no overvoltage,no overcurrent and uninterrupted power supply.Originality/value–The control strategies of the scheme ensure both overvoltage free and inrush current free when a locomotive enters or leaves the neutral section.Furthermore,this scheme is cost low by employing updated control strategy of software and add both the two current sensors and two connection wires of hardware.展开更多
通信机房内设备种类繁多,服务器等信息技术(Information Technology,IT)设备通常具有非线性负载特性,会产生大量谐波,对不间断电源(Uninterruptible Power Supply,UPS)的输出电能质量造成影响,导致UPS供电可靠性下降。为此,开展基于电...通信机房内设备种类繁多,服务器等信息技术(Information Technology,IT)设备通常具有非线性负载特性,会产生大量谐波,对不间断电源(Uninterruptible Power Supply,UPS)的输出电能质量造成影响,导致UPS供电可靠性下降。为此,开展基于电力物联网的UPS供电系统设计研究,通过电力物联网技术,实时监测各个设备的负载特性和用电情况,优化负载,实现供电分配,有效提升通信机房UPS供电系统性能。通过设计系统硬件冗余配置方案,设计三种模式转换。同时,系统软件设计方面,开展UPS供电容量设计,通过计算负载需求、考虑功率冗余及电池放电效率等因素,确保UPS能够满足负载需求。通过对比实验证明,该系统在电力供应稳定性、可靠性和智能化管理方面均表现出色,有效提升了通信机房的电力保障能力。展开更多
针对5G通信机房对不间断电源(Uninterruptible Power Supply,UPS)的严苛需求,深入探讨UPS设计的关键解决思路。从功率容量规划、电池选型与管理、冗余备份机制、智能化监控以及与5G设备的适配性等方面展开研究,旨在提供高效、可靠、稳...针对5G通信机房对不间断电源(Uninterruptible Power Supply,UPS)的严苛需求,深入探讨UPS设计的关键解决思路。从功率容量规划、电池选型与管理、冗余备份机制、智能化监控以及与5G设备的适配性等方面展开研究,旨在提供高效、可靠、稳定的电力保障方案,确保5G通信机房的持续运行,推动5G通信产业的稳健发展。展开更多
近年来,广播电视播出系统对不间断电源(Uninterruptible Power Supply,UPS)的需求不断增长。优化UPS电源系统的配置策略,以提升其供电效能,已经成为一个值得深入研究的问题。首先,简要阐述UPS电源系统工作原理,随后提出一种创新的UPS电...近年来,广播电视播出系统对不间断电源(Uninterruptible Power Supply,UPS)的需求不断增长。优化UPS电源系统的配置策略,以提升其供电效能,已经成为一个值得深入研究的问题。首先,简要阐述UPS电源系统工作原理,随后提出一种创新的UPS电源系统配置策略。其次,对不同供配电环境的冗余配置方式进行对比分析,以确定最优配置方案。最后,探讨广播电视UPS电源系统蓄电池容量的计算方法,并针对现有方法提出修正建议。展开更多
The UPS （uninterruptible power supplies） are essential power infrastructure components of systems designed for critical application, including data centers. High availability achievement is a very important factor r...The UPS （uninterruptible power supplies） are essential power infrastructure components of systems designed for critical application, including data centers. High availability achievement is a very important factor related to UPS performance, consequently to proper critical application functionality. Generally, UPS have a limited input voltage window, referring to the nominal input voltage value. Goal of this paper is to prove larger voltage window, without affecting normal UPS operation. Larger window will result on less commutation, backup and normal mode reduction, and consequently duty time of batteries reduction, too. Thus, under these conditions, it is to be expected availability improvement. The stabilizing node model, applied at UPS＇s control part through this paper is presented. UPS＇s behavior with an implemented stabilizing node is observed at few sites. In order to analyze and conclude about UPS＇s performance under these technical conditions, simulation results are further presented.展开更多
对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电...对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电源设备技术架构成为一个关键问题。主要探讨了广播电视制播工程项目中UPS电源设备的选用,对UPS高频机和UPS工频机进行了比较分析,进而给出了广播电视制播工程中UPS电源设备的选用策略。展开更多
不间断电源(Uninterruptible Power Supply,UPS)作为电力保障系统的重要组成部分,在现代电力系统中扮演着至关重要的角色。然而,由于UPS具有复杂的电子电路结构,在实际运行中常常面临各种故障问题,不仅影响系统的可靠性和稳定性,而且可...不间断电源(Uninterruptible Power Supply,UPS)作为电力保障系统的重要组成部分,在现代电力系统中扮演着至关重要的角色。然而,由于UPS具有复杂的电子电路结构,在实际运行中常常面临各种故障问题,不仅影响系统的可靠性和稳定性,而且可能导致重大的经济损失和安全风险。因此,深入分析UPS故障,并提出有效的解决方案具有重要意义。文章通过研究基于电子电路原理的UPS故障分析与解决方案,梳理相关理论和实践经验,为UPS故障诊断与维修提供参考与指导。展开更多
针对地铁无人值守车站信号设备房小型不间断电源(Uninterruptible Power Supply,UPS)因缺乏在线监测而导致故障影响大的问题,开展了基于5G和简单网络管理协议(Simple Network Management Protocol,SNMP)的小型UPS在线监测方法研究,对监...针对地铁无人值守车站信号设备房小型不间断电源(Uninterruptible Power Supply,UPS)因缺乏在线监测而导致故障影响大的问题,开展了基于5G和简单网络管理协议(Simple Network Management Protocol,SNMP)的小型UPS在线监测方法研究,对监测系统的原理及组成进行了详细的阐述,分析了SNMP协议的管理信息库(Management Information Base,MIB),并给出了MIB库的应用方法,运用5G技术进行数据传输,最后通过编制应用软件,实现了型号为UHA1R-0030L的艾默生小型UPS的远程实时数据采集,为地铁无人值守车站小型UPS远程监测提供了解决方案,对解决长期以来地铁无人值守车站小型UPS发生故障无法及时处理的问题具有十分重要的意义。展开更多
广播电视发射的政策性、技术性及专业性较强,对于广播电视系统安全播出任务的要求日益严格,对发射台机房电源保障能力的要求也愈发严格。由于发射台机房停播故障70%以上源于供电系统,文章设计了智能一体化不间断电源(Uninterruptible Po...广播电视发射的政策性、技术性及专业性较强,对于广播电视系统安全播出任务的要求日益严格,对发射台机房电源保障能力的要求也愈发严格。由于发射台机房停播故障70%以上源于供电系统,文章设计了智能一体化不间断电源(Uninterruptible Power Supply,UPS)系统方案,旨在避免广播电视发射台电源故障导致的停播事故,实现供配电系统零停播的要求和规范化、标准化、智慧化的用电目标。展开更多
地铁专用通信电源系统是地铁通信系统的一个重要子系统,不间断电源(Uninterruptible Power Supply,UPS)是地铁通信电源系统的重要组成设备。阐述地铁通信电源UPS各个部件构成,包括输入单元、整流器、逆变器、蓄电池组以及静态开关等,介...地铁专用通信电源系统是地铁通信系统的一个重要子系统,不间断电源(Uninterruptible Power Supply,UPS)是地铁通信电源系统的重要组成设备。阐述地铁通信电源UPS各个部件构成,包括输入单元、整流器、逆变器、蓄电池组以及静态开关等,介绍各个部件工作原理和地铁通信UPS采用的在线工作方式,并分析单机4种供电工作模式和并机5种供电工作模式的原理。最后,列举实际维护过程中发生的4件UPS故障,通过原因分析及处理过程描述,帮助提高UPS维护的实践能力。展开更多
This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events ...This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events of grid power outage. However, grid-integration of a back-up power supply substantiates continual power transfer to the loads, especially to the critical loads, which should not suffer from power interruptions. Therefore, design and circuit modeling of switching converters based reliable grid-tied emergency back-up power supply are presented in this paper. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by high frequency pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. However, there is a relay switching circuit to control the charging phenomenon of the battery. The proposed design is simulated in PLECS and the simulation results corroborate the reliability of the presented framework.展开更多
文摘Purpose–Auxiliary power system is an indispensable part of the train;the auxiliary systems of both electric locomotives and EMUs mainly are powered by one of the two ways,which are either from auxiliary windings of traction transformers or from DC-link voltage of traction converters.Powered by DC-link voltage of traction converters,the auxiliary systems were maintained of uninterruptable power supply with energy from electric braking.Meanwhile,powered by traction transformers,the auxiliary systems were always out of power while passing the neutral section of power supply grid and control system is powered by battery at this time.Design/methodology/approach–Uninterrupted power supply of auxiliary power system powered by auxiliary winding of traction transformer was studied.Failure reasons why previous solutions cannot be realized are analyzed.An uninterruptable power supply scheme for the auxiliary systems powered by auxiliary windings of traction transformers is proposed in this paper.The validity of the proposed scheme is verified by simulation and experimental results and on-site operation of an upgraded HXD3C type locomotive.This scheme is attractive for upgrading practical locomotives with the auxiliary systems powered by auxiliary windings of traction transformers.Findings–This scheme regenerates braking power supplied to auxiliary windings of traction transformers while a locomotive runs in the neutral section of the power supply grid.Control objectives of uninterrupted power supply technology are proposed,which are no overvoltage,no overcurrent and uninterrupted power supply.Originality/value–The control strategies of the scheme ensure both overvoltage free and inrush current free when a locomotive enters or leaves the neutral section.Furthermore,this scheme is cost low by employing updated control strategy of software and add both the two current sensors and two connection wires of hardware.
文摘通信机房内设备种类繁多,服务器等信息技术(Information Technology,IT)设备通常具有非线性负载特性,会产生大量谐波,对不间断电源(Uninterruptible Power Supply,UPS)的输出电能质量造成影响,导致UPS供电可靠性下降。为此,开展基于电力物联网的UPS供电系统设计研究,通过电力物联网技术,实时监测各个设备的负载特性和用电情况,优化负载,实现供电分配,有效提升通信机房UPS供电系统性能。通过设计系统硬件冗余配置方案,设计三种模式转换。同时,系统软件设计方面,开展UPS供电容量设计,通过计算负载需求、考虑功率冗余及电池放电效率等因素,确保UPS能够满足负载需求。通过对比实验证明,该系统在电力供应稳定性、可靠性和智能化管理方面均表现出色,有效提升了通信机房的电力保障能力。
文摘针对5G通信机房对不间断电源(Uninterruptible Power Supply,UPS)的严苛需求,深入探讨UPS设计的关键解决思路。从功率容量规划、电池选型与管理、冗余备份机制、智能化监控以及与5G设备的适配性等方面展开研究,旨在提供高效、可靠、稳定的电力保障方案,确保5G通信机房的持续运行,推动5G通信产业的稳健发展。
文摘近年来,广播电视播出系统对不间断电源(Uninterruptible Power Supply,UPS)的需求不断增长。优化UPS电源系统的配置策略,以提升其供电效能,已经成为一个值得深入研究的问题。首先,简要阐述UPS电源系统工作原理,随后提出一种创新的UPS电源系统配置策略。其次,对不同供配电环境的冗余配置方式进行对比分析,以确定最优配置方案。最后,探讨广播电视UPS电源系统蓄电池容量的计算方法,并针对现有方法提出修正建议。
文摘The UPS （uninterruptible power supplies） are essential power infrastructure components of systems designed for critical application, including data centers. High availability achievement is a very important factor related to UPS performance, consequently to proper critical application functionality. Generally, UPS have a limited input voltage window, referring to the nominal input voltage value. Goal of this paper is to prove larger voltage window, without affecting normal UPS operation. Larger window will result on less commutation, backup and normal mode reduction, and consequently duty time of batteries reduction, too. Thus, under these conditions, it is to be expected availability improvement. The stabilizing node model, applied at UPS＇s control part through this paper is presented. UPS＇s behavior with an implemented stabilizing node is observed at few sites. In order to analyze and conclude about UPS＇s performance under these technical conditions, simulation results are further presented.
文摘对于广播电视制播工程项目,为确保直播内容安全播出和内容编辑的时效性,与直播相关的系统和内容编辑系统的核心设备需要接入不间断电源(Uninterruptible Power Supply,UPS)供电回路。因此,在供配电系统设计过程中,如何选择合适的UPS电源设备技术架构成为一个关键问题。主要探讨了广播电视制播工程项目中UPS电源设备的选用,对UPS高频机和UPS工频机进行了比较分析,进而给出了广播电视制播工程中UPS电源设备的选用策略。
文摘不间断电源(Uninterruptible Power Supply,UPS)作为电力保障系统的重要组成部分,在现代电力系统中扮演着至关重要的角色。然而,由于UPS具有复杂的电子电路结构,在实际运行中常常面临各种故障问题,不仅影响系统的可靠性和稳定性,而且可能导致重大的经济损失和安全风险。因此,深入分析UPS故障,并提出有效的解决方案具有重要意义。文章通过研究基于电子电路原理的UPS故障分析与解决方案,梳理相关理论和实践经验,为UPS故障诊断与维修提供参考与指导。
文摘针对地铁无人值守车站信号设备房小型不间断电源(Uninterruptible Power Supply,UPS)因缺乏在线监测而导致故障影响大的问题,开展了基于5G和简单网络管理协议(Simple Network Management Protocol,SNMP)的小型UPS在线监测方法研究,对监测系统的原理及组成进行了详细的阐述,分析了SNMP协议的管理信息库(Management Information Base,MIB),并给出了MIB库的应用方法,运用5G技术进行数据传输,最后通过编制应用软件,实现了型号为UHA1R-0030L的艾默生小型UPS的远程实时数据采集,为地铁无人值守车站小型UPS远程监测提供了解决方案,对解决长期以来地铁无人值守车站小型UPS发生故障无法及时处理的问题具有十分重要的意义。
文摘广播电视发射的政策性、技术性及专业性较强,对于广播电视系统安全播出任务的要求日益严格,对发射台机房电源保障能力的要求也愈发严格。由于发射台机房停播故障70%以上源于供电系统,文章设计了智能一体化不间断电源(Uninterruptible Power Supply,UPS)系统方案,旨在避免广播电视发射台电源故障导致的停播事故,实现供配电系统零停播的要求和规范化、标准化、智慧化的用电目标。
文摘地铁专用通信电源系统是地铁通信系统的一个重要子系统,不间断电源(Uninterruptible Power Supply,UPS)是地铁通信电源系统的重要组成设备。阐述地铁通信电源UPS各个部件构成,包括输入单元、整流器、逆变器、蓄电池组以及静态开关等,介绍各个部件工作原理和地铁通信UPS采用的在线工作方式,并分析单机4种供电工作模式和并机5种供电工作模式的原理。最后,列举实际维护过程中发生的4件UPS故障,通过原因分析及处理过程描述,帮助提高UPS维护的实践能力。
文摘This paper documents design and modeling of a grid-connected emergency back-up power supply for medium power applications. Back-up power supplies are very important in regard to support electrical loads in the events of grid power outage. However, grid-integration of a back-up power supply substantiates continual power transfer to the loads, especially to the critical loads, which should not suffer from power interruptions. Therefore, design and circuit modeling of switching converters based reliable grid-tied emergency back-up power supply are presented in this paper. There are a rectifier-link boost derived battery charging circuit and a 4-switch push-pull power inverter circuit which are controlled by high frequency pulse width modulation (PWM) signals. This paper presents a state averaging model and Laplace domain transfer function of the charging circuit and a switching converter model of the power inverter circuit. A changeover relay based transfer switch controls the power flow towards the utility loads. During off-grid situations, loads are fed power by the proposed inverter circuit and during on-grid situations, battery is charged by an ac-link rectifier-fed boost converter. However, there is a relay switching circuit to control the charging phenomenon of the battery. The proposed design is simulated in PLECS and the simulation results corroborate the reliability of the presented framework.
