气象信息系统机房断电报警设计的探讨

气象信息系统是由气象通信系统和多媒体会议系统等应用系统、以及相关的网络基础设施等组成的、承担着实时气象数据传输和交换、预报预测和服务产品的收集与分发的业务系统。而一个完善的机房供配电系统是保证气象信息系统内各用电设备可靠运行的基本条件。虽然利用UPS电源可实现对设备的持续供电,也可利用UPS的断电报警功能对线路的运行实现简单监控,但是,如果UPS电源和值班室不在同一空间,UPS自带的报警声传输距离有限,值班员往往听不到UPS的报警声,也无法及时得到市电停电的消息,值班员知道停电的时刻也是UPS放电完毕设备停机的时刻。因此,对UPS电源输入端的供电系统的监控同样十分重要。文章利用解决上述问题的工作实际,设计了利用继电器实现气象信息系统计算机机房断电报警电路,结合市场上已有的报警装置,实现了对气象信息系统计算机机房断电报警以及将报警信息利用手机和电话进行无线传输的功能。     

电除尘高效电源选型设计方法

电除尘高效电源种类现主要是三相电源、高频电源和脉冲电源。高效电源较常规单相电源,具有更高的能量转换效率、除尘效率以及更好的节能效率。根据高效电源电除尘提效机理,分析并阐述了三种高效电源在电除尘容性负载状态下的负载响应特性,介绍了三种高效电源的选型设计方法,以提高高效电源的选型和应用水平。     

电除尘器高频电源的提效节能应用

对电除尘器高频电源的基本结构、技术性能特点作了简要介绍,阐述了高频电源的提效节能原理,提供了具体应用实例作为佐证,并推荐了适合高频电源应用的场合。     

新型电控提效节能技术在300MW火电机组的应用

电除尘器的运行效果依赖于本体和电控系统的有效配合,电控系统对除尘器的除尘效率、运行能耗的作用日益凸显。文章结合太钢能源动力总厂1#机组300MW电除尘器电控设备提效节能的改造实例,介绍了高频电源、脉冲电源的应用情况,通过现场综合调试,实现了提高电除尘效率的同时大幅度降低电除尘运行能耗的良好效果。     

燃料电池发电系统安全与标准化

燃料电池因具有高效、节能、环保等优点,在电动汽车、分布式电站、便携式备用电源等方面具有广泛的应用前景,而燃料电池的安全标准是燃料电池产品市场准入的重要保证。燃料电池发电系统的安全涉及机械危险、电气危险、热危险、化学危害、物理危险、设备故障危险、因不适当的人机工程学原理而导致的危险及人机界面危险、合理预见的误用、环境条件危险、污染等方面。本文介绍了国内外燃料电池发电系统安全技术以及标准化的现状。     

高频电源与三相电源运行特性浅析及组合应用

概述了电除尘设备对高压电源的要求,同时对高频电源、三相电源的原理、供电和闪络特性进行了分析比较,并介绍了两种电源在600MW机组上的组合应用情况。     

逆变弧焊电源电磁兼容性问题的探讨

介绍了电磁兼容的内涵及其对焊接设备的要求,分析了逆变弧焊电源电磁干扰的危害性,并对其产生机理及抑制措施进行了探讨,提出了对逆变弧焊电源电磁兼容性的系统化设计是今后的一项重要工作。     

脉冲荷电型静电除尘电源技术研究

文章阐述了脉冲激励型静电除尘电源的发展历程,分析了两种典型脉冲激励静电除尘电源拓扑的优缺点,并针对采用高压开关方式的脉冲型静电除尘电源进行了研究,提出了设计思路,进行了仿真分析,建立了10kV直流叠加10kV脉冲电源系统并验证了设计的可行性;采用晶闸管研制了20kV/300A高压开关模块,并进行了实验验证。     

电源干扰对计算机化设备的影响及其抑制

电源线上的噪声和电压波动（统称电源干扰）对计算机化的设备特别易受干扰，因此电源干扰已日益成为电磁环境领域的重要问题。本文介绍了电源干扰的模式和类型，分析了电源干扰对计算机化设备的影响及测试标准。提出了抑制电源干扰的多种方法，以供读者参考使用。     

基于中频调幅调压的电除尘用脉冲电源的研究

介绍了电除尘(ESP)用脉冲高压电源的一种技术方案。分析了其工作原理、技术方案和特性。应用结果表明,ESP供电采用脉冲电源与高频电源组合方式,具有节能及减排的双重效果,脉冲电源采用中频调幅调压具有优良的控制特性。     

RESERVOIR OPERATION ANI EVALUATION OF DOWNSTREAM FLOW AUGMENTATION1

ABSTRACT: Operation of a storage‐based reservoir modifies the downstream flow usually to a value higher than that of natural flow in dry season. This could be important for irrigation, water supply, or power production as it is like an additional downstream benefit without any additional investment. This study addresses the operation of two proposed reservoirs and the downstream flow augmentation at an irrigation project located at the outlet of the Gandaki River basin in Nepal. The optimal operating policies of the reservoirs were determined using a Stochastic Dynamic Programming (SDP) model considering the maximization of power production. The modified flows downstream of the reservoirs were simulated by a simulation model using the optimal operating policy (for power maximization) and a synthetic long‐term inflow series. Comparing the existing flow (flow in river without reservoir operation) and the modified flow (flow after reservoir operation) at the irrigation project, the additional amount of flow was calculated. The reliability analysis indicated that the supply of irrigation could be increased by 25 to 100 percent of the existing supply over the dry season (January to April) with a reliability of more than 80 percent.     

A COMPARISON OF TWO METHODS FOR MULTIOBJECTIVE OPTIMIZATION FOR RESERVOIR OPERATION1

ABSTRACT: Two major objectives in operating the multireservoir system of the Upper Colorado River basin are maximization of hydroelectric power production and maximization of the reliability of annual water supply. These two objectives conflict. Optimal operation of the reservoir system to achieve both is unattainable. This paper seeks the best compromise solution for an aggregated reservoir as a surrogate of the multireservoir system by using two methods: the constraint method and the method of combined stochastic and deterministic modeling. Both methods are used to derive the stationary optimal operating policy for the aggregated reservoir by using stochastic dynamic programming but with different objective functions and minimum monthly release constraints. The resulting operating policies are then used in simulated operation of the reservoir with historical inflow records to evaluate their relative effectiveness. The results show that the policy obtained from the combination method would yield more hydropower production and higher reliability of annual water supply than that from the constraint-method policy.     

黔"西电东送"的电力供给与市场需求可靠性分析

贵州省经济发展滞后,但电力资源丰富。发展电力,将贵州省的能源资源优势转化为经济优势,是振兴贵州经济的希望所在。结合贵州西电东送的优势,从供给与需求出发分析了"黔电送粤"的市场可靠性,以及西电东送对贵州经济的拉动作用。     

开关电源模块可靠性的研究

本文分析了某军用开关电源模块的工作原理以及关键点波形,找出了开关电源模块中易于失效的关键元件,提出了目前开关电源发展所面临的可靠性寿命评价的关键问题。     

Sizing and performance analysis of standalone hybrid photovoltaic/battery/hydrogen storage technology power generation systems based on the energy hub concept

In this study, the optimal sizing and performance analysis of a standalone integrated solar power system equipped with different storage scenarios to supply the power demand of a household is presented. One of the main purposes when applying solar energy resource is to face the increasing environmental pollutions resulting from fossil fuel based electricity sector. To this end, and to compare and examine two energy storage technologies (battery and hydrogen storage technology), three storage scenarios including battery only, hydrogen storage technology only and hybrid storage options are evaluated. An optimization framework based on Energy Hub concept is used to determine the optimum sizes of equipment for the lowest net present cost (NPC) while maintaining the system reliability. It was determined that the most cost effective and reliable case is the system with hybrid storage technology. Also, the effects of solar radiation intensity, the abatement potential of CO₂ emissions and converting excess power to hydrogen on the system’s performance and economics, were investigated and a few noticeable findings were obtained.     

Measurement of market power for the environmentally regulated Korean iron and steel manufacturing industry

For industries in which where market prices of certain inputs are not available, measuring the degree of market power by using the markup over the marginal market cost may be inappropriate. With regard to the Korean iron and steel manufacturing industry, which is subject to environmental regulations, the calculation of the price of abatement capital is hindered by a lack of relevant data. To increase the reliability of market power markups, this paper estimates the restricted cost function in which abatement capital is assumed to be quasi-fixed at an optimal level and the supply relation. The degree of market power for the industry, measured as the ratio of the estimated market power markup to the supply price, was estimated to be 0.54 on average between 1982 and 2001. The results indicate that ignoring environmental regulations can overstate the degree of market power by approximately 12%.     

装备系统可靠性评估技术中数据收集方法探讨

装备系统可靠性评估一直是个难题,而可靠性数据的收集又是评估工作的一项重要工作,文章从装备系统可靠性数据收集工作的概念、方法和目的入手,探讨了数据收集的原则、内容和收集程序。     

Critical Risk Indicators (CRIs) for the electric power grid: a survey and discussion of interconnected effects

The electric power grid is a critical societal resource connecting multiple infrastructural domains such as agriculture, transportation, and manufacturing. The electrical grid as an infrastructure is shaped by human activity and public policy in terms of demand and supply requirements. Further, the grid is subject to changes and stresses due to diverse factors including solar weather, climate, hydrology, and ecology. The emerging interconnected and complex network dependencies make such interactions increasingly dynamic, posing novel risks, and presenting new challenges to manage the coupled human–natural system. This paper provides a survey of models and methods that seek to explore the significant interconnected impact of the electric power grid and interdependent domains. We also provide relevant critical risk indicators (CRIs) across diverse domains that may be used to assess risks to electric grid reliability, including climate, ecology, hydrology, finance, space weather, and agriculture. We discuss the convergence of indicators from individual domains to explore possible systemic risk, i.e., holistic risk arising from cross-domain interconnections. Further, we propose a compositional approach to risk assessment that incorporates diverse domain expertise and information, data science, and computer science to identify domain-specific CRIs and their union in systemic risk indicators. Our study provides an important first step towards data-driven analysis and predictive modeling of risks in interconnected human–natural systems.

     

基于GB/T 29309标准的HALT测试技术分析

本文以标准GB/T 29309-2012为基础,以某款开关电源为例,对HALT试验设备、工作极限与破坏极限、试验步骤及设备运行中注意点等方面展开介绍,为电子产品可靠性测试提供相关探讨。