电力系统UPS接线方式探讨

全面介绍了电力系统用UPS的各种接线方式的结构及其优缺点 ,对电力系统用户正确选用UPS具有指导作用     

电力系统用三相UPS的设计

分析了电力系统对三相UPS的特殊要求,设计出了适用于电力系统的三相UPS,该装置可以用于发电厂、变电站等电力部门,以提高其供电可靠性。     

变电站用电力UPS冗余系统

为了使电力系统中诸如计算机、RTU、VQC和变送器等设备能够安全可靠地运行,就需要有UPS作保障。电力UPS的稳定性直接关系到电力供电的安全,因此目前变电站在配置UPS电源时大多选用双机冗余措施来提高系统的安全性。在电力系统中,     

双CPU控制电力专用UPS的设计

结合电力系统的具体情况,提出了一种基于C508、89C51RD2双CPU和智能功率模块(IPM)开发的电力专用不间断电源(UPS)。着重介绍了该UPS的工作原理及硬件与软件设计。通过运用先进的电力电子技术和计算机控制技术,实现了电力专用UPS的全数字、智能化控制。该产品现已批量投产,运行在多个用户现场,运行表明该UPS完全克服了传统UPS在电力系统使用中的局限性,具有自动化程度高、抗干扰能力强、性能稳定的特点,完全满足了电力系统的运行要求。     

大容量模块UPS在电厂中的应用

最近几年,模块UPS被广泛应用,但由于电力系统内没有成功的运行经验,各发电厂都很谨慎,甚至新建电厂仍然采用双机并联运行方式的传统UPS。本文通过对模块UPS与传统UPS的比较,阐述了模块UPS的优越性,介绍了绥中电厂模块UPS系统的配置及应用情况,可为发电厂的UPS改造提供参考。     

计算机场地电力系统的高可用性

计算机场地电力系统的高可用性是建立在电力系统从高压、低压、UPS到插座这样一个完整的供配电系统中。     

基于DSPIC船用模糊控制三相UPS的设计

当船舶电力系统出现故障时,许多设备需要利用不间断电源(UPS)来维持运行,且船用UPS必须是可提供恒压恒频的电源设备。鉴于模糊控制策略具有较强的鲁棒性和自适应性,将该控制方法应用在了UPS稳压控制上,并设计了基于DSPIC的三相UPS电路。     

应用APF技术的新型在线互动式UPS

从概念原理、主电路结构、方法、控制策略等方面对应用APF（有源电力滤波器）技术的新型在线互动式UPS（不间断电源）进行了介绍。经过相关具体电路分析发现，应用APF技术的新型在线互动式UPS具有多种功能，可以用来低成本的消除UPS和负载对电力系统产生的谐波，同时也可以消除电力系统和其他负载对用户干扰。     

UPS和发电机组的潜在问题

不间断电源(UPS)和发电机组这类子系统的有关故障可能危及整个电力系统的可靠供电。因此,对于UPS和发电机组与负载的兼容性问题,必须引起足够的重视。     

火力发电厂集控UPS旁路报警的分析与处理

火力发电厂不间断电源系统(UPS)是整个电厂电力系统的安全防线和重要的电气设备。基于一起UPS旁路频繁报警的异常故障,介绍故障的发现及排查过程,指出UPS旁路电压与逆变器出口电压不同步是故障原因,提出相应的解决方案,为UPS的检查和消缺经验的完善提供了参考。     

Technology for highly dependable large capacity uninterruptible power supply system

Powerful information networks comprising computers and communication equipment are a modern fact of life. Our dependence upon them requires that they function with no problems. System safety is crucial. Uninterruptible power supply (UPS) systems are commonly equipped to supply stable power regarding critical loads, e.g., large computer centers, telephone and telecommunication centers, aviation control systems, etc. Several types of UPS systems are now used in many of these important fields. However, there has been to date little numerical evaluation vis-a-vis system reliability. This paper evaluates mean time between failures (MTBF) of parallel redundant UPS systems, and reports that the MTBF of two sets of parallel redundant UPS systems is lower than that of 3 sets of parallel redundant UPS systems under some circumstances. Continuous power supply reliability of the UPS system with bypass and uninterruptible transfer switch is much higher than is the case for other UPS systems lacking bypass circuit and uninterruptible transfer switch. Highly reliable parallel operation technology is also shown.     

一种UPS的无互联线并联控制技术研究

由于模块化电压型逆变器并联控制便于系统扩容和提高系统可靠性,因而逆变器之间或逆变器与公共电网之间组成的并联运行系统正向众多领域(如UPS系统)推广应用. 本文介绍了一种基于频率和电压下垂均流控制的无互联线并联UPS系统.由于采用有功和无功功率作为控制变量,从理论上分析了输出功率与两台UPS之间的输出电压的相位差和幅值差的关系,给出了系统的数字控制方案,在采用TMS320F240控制的两台3KVA的UPS上进行了实验,验证了理论分析.     

A three-phase line-interactive UPS system implementation with series-parallel active power-line conditioning capabilities

This paper presents a three-phase line-interactive uninterruptible power supply (UPS) system with series-parallel active power-line conditioning capabilities, using a synchronous-reference-frame (SRF)-based controller, which allows an effective power-factor correction, load harmonic current suppression, and output voltage regulation. The three-phase UPS system is composed of two active power filter topologies. The first one is a series active power filter, which works as a sinusoidal current source in phase with the input voltage. The other is a parallel active power filter, which works as a sinusoidal voltage source in phase with the input voltage, providing to the load a regulated and sinusoidal voltage with low total harmonic distortion. Operation of a three-phase phase-locked loop structure, used in the proposed line-interactive UPS implementation, is presented and experimentally verified under distorted utility conditions. The control algorithm using the SRF method and the active power flow through the UPS system are described and analytically studied. Design procedures, digital simulations, and experimental results for a prototype are presented to verify the good performance of the proposed three-phase line-interactive UPS system.     

UPS供电系统可用性研究

UPS供电系统的功能经历了从保护计算机硬件设备到保护运算和传输的数据，再到保证系统供电的连续性。伴随着这种功能的变化，对UPS的研究也经历了从主要对设备的研究，到开始重视对整个系统的研究，从对设备和系统的可靠性研究到可用性研究。可用性是供电设备和供电系统最终的、综合性的、最有价值的可靠性指标，对可用性的深入研究有助于供电系统设计理念的革新和UPS应用水平的提高。     

信息机房建设中UPS电源系统的设计选型

UPS电源系统是电子信息机房的重要组成部分,担负着保障机房服务器与电子通信设备供电的重要任务。结合近期江西省电力通信公司信息机房工程UPS电源系统建设的实例,介绍UPS电源系统的设计选型的一般方法以及安装时应注意的一些问题。     

一种采用高频PWM整流电路的大功率不间断电源

介绍了采用PWM整流电路的不间断电源的系统结构 ,分析了PWM整流电路工作原理和控制方法 ,在此基础上 ,研制了一台 30kVA不间断电源样机。实验结果表明 ,采用PWM整流电路的不间断电源具有注入电网的谐波电流小、输入功率因数接近 1等优点 ,是一种很有发展前途的不间断电源。     

大型数据中心UPS电源系统选型配置研究

UPS电源系统是数据中心的核心动力系统,对保证数据中心安全可靠运行起着至关重要的作用。结合UPS设备的能效分级数据,倡导现代数据中心UPS电源系统应在系统构架上采用先进的节能技术,确保数据中心电源系统具有绝对可靠的供电安全等级。重点对UPS的并机模式、选型要求、几种拓扑结构和UPS性能差异进行分析和研究,提出适合本工程的高效、节能的设备选型建议。     

Active power flow control in a distribution system using discontinuous voltage controller

This paper proposes a hybrid discontinuous control methodology for a voltage source converter (VSC), which is used in an uninterrupted power supply (UPS) application. The UPS controls the voltage at the point of common coupling (PCC). An LC filter is connected at the output of the VSC to bypass switching harmonics. With the help of both filter inductor current and filter capacitor voltage control, the voltage across the filter capacitor is controlled. Based on the voltage error, the control is switched between current and voltage control modes. In this scheme, an extra diode state is used that makes the VSC output current discontinuous. This diode state reduces the switching losses. The UPS controls the active power it supplies to a three-phase, four-wire distribution system. This gives a full flexibility to the grid to buy power from the UPS system depending on its cost and load requirement at any given time. The scheme is validated through simulation using PSCAD.     

UPS与控制系统电源的可靠性

综合分析UPS与控制系统电源的可靠性及其故障原因,针对国内大中型火电机组控制系统电源的供电可靠性及其在设计、产品质量、维护管理方面存在的问题进行探讨,提出了相应的改进意见.