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。     

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。     

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。     

电力系统二次设备UPS配置方案及选择探讨

电力系统二次设备安全稳定运行首先要有可靠的电源保证,目前电力公司变电站、电力调度控制中心机房都配有相应的UPS设备,不同的二次设备UPS配置运行方式也不完全相同,结合电力公司常见的UPS配置方式做出科学的评述,为电力企业运行维护人员选配UPS提供很好的参考。     

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.     

UPS配电系统设计

分析了不间断电源(UPS)的供电特点,介绍了UPS容量及输入、输出配电系统的相关计算方法。指出UPS在选择负载时,需考虑功率因数匹配的问题,再根据负荷性质和供电要求确定UPS容量及工作方式,以保证设备安全、稳定运行。     

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.     

UPS供电系统现状及设计理念的变化

随着IT技术的发展，作为它的基础物理设施的供电系统，其设计理念和配置方法也在发生着明显的变化。提高系统的可用性、可管理性以及在性能要求变化时的适应性成为促成这种变化的重要原因和变化应达到的最终效果。本文在分析了当前UPS供电系统现状和存在问题的前提下，对正在发生变化的五个方面进行了分析和展望，预示着UPS技术及以其为核心的供电系统的新的发展趋势。     

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.     

基于环流功率理论的单相UPS并联均流控制设计

利用数字控制方式实现并联UPS间可靠均流具有重要的应用价值.文中通过对并联UPS环流功率模型分析,建立起N台并联UPS的环流有功功率、无功功率与逆变器输出电压幅值、相位间的量化调节关系,并采用DSP两级锁相、再调制方法,实现单相UPS输出电压幅值及相位的精确控制,从而达到准确均流目的.本设计具体以TMS320LF280...     

A universal conditioner with optimized system performance

Recent years have seen the development of various power electronic conditioners with rapid advancements in their topological layouts and control algorithms. The examples are active power filters (APFs), fault current limiters (FCLs) and uninterruptible power supplies (UPSs). There is, however, a lack of international research attention on the integration of the various merits of the different classes of power conditioners to form a universal system that provides appropriate power compensation to utility systems under various disturbance conditions. The paper therefore attempts to integrate the harmonic current compensation of an APF when supplying non-linear loads, the fault current limiting and the bus voltage enhancement capabilities of a FCL, and the voltage regulation and backup power supply features of a UPS to form a universal power conditioner which significantly enhances the quality of power supplied under various system conditions. Received: 2 November 2001/Accepted: 22 December 2001     

提高UPS供电系统可用性的探讨

针对UPS技术在供电系统中应用存在的问题，论述了提高该系统可用性的理论及在实际应用中应采取的相应措施。