要正确理解100kVA容量UPS的“53kW现象”

通过实际分析表明．100kVA容量UPS出现的“55kW现象”,在部分产品中确实出现过,它是由两个原因造成的：①是由于某些厂家受市场竞争因素的驱使,用80kw取代100kVA计算选择UPS逆变开关管．把UPS容量减小了20％：②是与UPS的电路结构有关,在UPS的输出端加入了感性无功负载补偿电容Cc,此电容在负载功率因数PF＝1时,由补偿电容变成负载电容,增大了UPS的负载电流．使UPS的输出有功功率降低到53kW.这种现象只是在部分产品中出现的,它不是所有100kVAUPS都具有的现象     

减少核心机房UPS事故需要注意的几个问题

核心机房UPS为重要负载供电,不容忽视。文章介绍了UPS输出负载短路的后果及解决方案;结合案例说明维护中要重视零线的检查;UPS零地电压产生的原因及解决方案;UPS蓄电池安装,需要注意的问题;UPS电容爆炸的原因及解决方案,并分析了电容爆炸几种不同现象的原因。     

模块化UPS性能改进分析

UPS在通信网络中的应用日益广泛,文中指出了传统UPS供电存在可靠性及可维护性差等问题,对模块化UPS在功率模块控制方式、系统并机方式、系统旁路控制方式、蓄电池组设置、系统的容量选择、冗余方式等性能改进进行了详细分析。     

天然气管道阀室UPS系统故障与对策分析

阐述长输管道中的阀室管理，UPS系统在稳定运行中给阀室提供高质量的电源。探讨阀室的工作原理，UPS系统故障的原因，UPS系统故障的优化措施，提出优化方案，控制UPS系统安全运行，从而避免发生UPS系统故障。     

基于Trans-Z源逆变电路的UPS系统的研究

针对UPS系统中由传统逆变器缺陷引起的升压难、控制复杂、抗干扰差的问题,基于Trans-Z源逆变电路提出一种新的UPS系统拓扑。研究Trans-Z源逆变电路基本结构、工作原理;采用正弦脉冲宽度调制(SPWM)对电路进行总体控制并改变输出电压;在理论分析的基础上给出Saber下的仿真结果;最后,以DSP芯片作为逆变主控芯片,搭建应用于UPS的Trans-Z源逆变电路。实际结果表明,该电路克服了传统逆变器的缺点,移除了死区控制时间,具有更好的升压能力,且提升了UPS带载能力,更适合应用于UPS充放电控制中。     

冗余式UPS关键技术研究

冗余式UPS的出现克服了单机UPS运行固有的缺点,极大地提高了系统的可扩展性、冗余性、热插拔性和可交互性。文中在介绍冗余式UPS均流技术的基础上,研究了通过DSP控制实现系统单元模块热插拔的途径和通过CAN总线进行数据交换实现系统监控与保护的方法。     

UPS电源中SPWM控制技术的研究

论述了目前UPS电源中所用到的一些SPWM控制方法，重点介绍了一种基于PIC16F73单片机产生SPWM控制波形的方法，以及这种方法应用于在线式纯正弦波UPS电源系统中的可行性。     

UPS逆变电源的并联控制技术综述

多模块UPS能较灵活地实现对电源系统容量的扩展，为了增加整个电源系统的可靠性，它可以组成冗余并联系统。文中对目前采用的UPS并联连接控制方式和均流控制技术进行了综述。逆变器并联的全数字化控制方案是交流电源领域的发展趋势。     

一种基于双向变换器的数字化UPS设计

针对传统高频机型UPS存在可靠性较差、抗电流冲击能力弱等缺点[5],采用了一种集充电和逆变一体化的单相UPS拓扑结构,并利用DSP芯片TMS320F28062进行控制,有效解决了传统高频UPS存在的以上问题。系统所用元器件数量减少,控制环节简单。通过设计1kW样机并进行了试验,UPS在逆变模式下交流输出电压为220V,充电模式下直流输出电压为27.6V,验证了电路拓扑和软件结构的正确性。     

UPS供电系统的设计

“UPS供电系统的设计”技术讲座连载了11期,到本期结束。内容涉及UPS的供电环境、UPS产品的设计趋势、民航管制中心、电信机房、互联网数据中心、有线电视网络、工业控制、银行证券及电力系统等方面,内容广泛,可供电源系统及机房设计人员参考。     

Microprocessor-based modified discrete integral variable-structurecontrol for UPS

This paper presents a digital signal processor microprocessor-based high-performance uninterruptible power system (UPS). It also modifies the integral variable-structure control (IVSC) approach to be more suitable for the UPS, which is tracking a sinusoidal AC voltage with specified frequency and amplitude. Since the implementation of the control laws has tended to the digital microprocessor, the paper extends the modified IVSC to the discrete time domain. Procedures are developed for determining the control function, the switching plane and the integral control gain, so that the system has desired properties. Simulation and experimental results show that the proposed scheme can supply a high-quality voltage power source in the presence of load disturbance and parameter variation     

UPS监控技术综述

随着计算机、网络通信技术的发展，UPS系统的可管理性，可服务性已经成为提高其中用性的重要途径，而其可管理性，可服务性的重要体现则是丰富的软、硬件监控功能，文中对“智能UPS”的概念和目前UPS所使用的监控技术作了介绍，总结了一个高度智能的监控模式，并预测了未来UPS监控技术的发展趋势。     

Analysis and design of a multiple feedback loop control strategyfor single-phase voltage-source UPS inverters

This paper presents the analysis and design of a multiple feedback loop control scheme for single-phase voltage-source uninterruptible power supply (UPS) inverters with an L-C filter. The control scheme is based on sensing the current in the capacitor of the load filter and using it in an inner feedback loop. An outer voltage feedback loop is also incorporated to ensure that the load voltage is sinusoidal and well regulated. A general state-space averaged model of the UPS system is first derived and used to establish the steady-steady quiescent point. A linearized small signal dynamic model is then developed from the system general model using perturbation and small-signal approximation. The linearized system model is employed to examine the incremental dynamics of the power circuit and select appropriate feedback variables for stable operation of the closed-loop UPS system. Experimental verification of a laboratory model of the UPS system under the proposed closed-loop operation is provided for both linear and nonlinear loads. It is shown that the control scheme offers improved performance measures over existing schemes, It is simple to implement and capable of producing nearly perfect sinusoidal load voltage waveform at moderate switching frequency and reasonable size of filter parameters. Furthermore, the scheme has excellent dynamic response and high voltage utilization of the DC source     

十堰电视台播控机房供电系统设计

十堰电视台根据广电总局要求,从实际情况出发,设计了一套安全可靠的供电系统.详细介绍了这套供电系统设计要求、双路供电系统自动和手动倒换系统设计、UPS电源系统设计和供电系统维护管理经验等.实际使用证明了这套双回路电源自动切换系统设计简单、安全可靠.     

Control of Distributed Uninterruptible Power Supply Systems

In the last years, the use of distributed uninterruptible power supply (UPS) systems has been growing into the market, becoming an alternative to large conventional UPS systems. In addition, with the increasing interest in renewable energy integration and distributed generation, distributed UPS systems can be a suitable solution for storage energy in micro grids. This paper depicts the most important control schemes for the parallel operation of UPS systems. Active load-sharing techniques and droop control approaches are described. The recent improvements and variants of these control techniques are presented.     

基于PIC的后备式UPS的实现

介绍了PIC16C73B单片机和它的特点。分析了后备式UPS的基本原理。并结合PIC16C73B给出了一种后备式UPS实现的实例。文章对后备式UPS设计中的关键参数及其处理方法进行了详细介绍。并且根据硬件设计框图,具体分析了后备式UPS的逆变过程和相关的软件编程。     

DSP control of high-power UPS systems feeding nonlinear loads

Many facilities, such as patient health care centers, data processing systems, and critical telecommunication links, rely on uninterruptible power supplies (UPS) to maintain a continuous supply of power in case of a line outage. In addition to requiring continuous power, many critical nonlinear loads are sensitive to incoming line transients and input harmonic voltage distortion. Conventional UPS systems operate to protect against such disturbances using complex filtering schemes, often employing large passive components. This paper presents the advantages of using real time digital signal processing (DSP) control of UPS systems. A DSP controlled UPS inverter and harmonic conditioning system is described and the performance is verified on a 150 kVA system