特大城市220kV变电站电气主接线的探索

重点对特大型城市常用的220 kV双母线与双母线双分段两种主接线进行对比。首先通过这两种220 kV变电站主接线在正常运行方式和故障时的停电范围、主变压器负荷供电保证率的计算结果,分析主接线的可靠性不同特点及适用范围。然后通过操作灵活性、调度灵活性和扩建方便性三个方面,来分析这两种主接线的灵活性不同特点。再通过经济比较,得到两种接线的经济性优劣。最后通过对可靠性、灵活性与经济性的比较,得到特大型城市适宜的220 kV变电站电气主接线。     

含有3台主变的220kV变电所主接线方案探讨

随着电网负荷的飞速增长，电网中有3台主变的220kV变电所将逐渐增多，从运行角度分析了各类主接线方案，并提出了含有3台主变的220kV变电所将逐渐增多，从运行角度分析了各类主接线方案，并提出了含有3台主变的220KV变电所主接线的设计原则建议。     

轨道交通主变电所主变差动保护误动事故分析

介绍一起区外故障引起的轨道交通主变电所主变差动保护误动作事故,对故障原因进行分析,并给出了整改措施。阐述了两种主变电所接地变的接线形式,并进行了对比分析;针对主变低压侧直接T接接地变的形式,应避免因差动保护接线和差动保护程序均未考虑主变低压侧零序电流问题,而导致区外接地故障时主变差动保护误动作情况。     

左江电站电气主接线改进的探讨

针对左江电站目前的电气主接线设计方案进行技术经济分析,并提出供电可靠性较高的电站电气主接线新方案。     

35kV变电站主系统设计

根据主接线选择的一般原则要求和本设计的实际情况,比较各种接线形式的优缺点,选择合适的主接线形式,并绘制变电气主接线图;再通过暂态分析法,绘制等值电路图,列出短路计算步骤.     

10kV双电源供电用户配电间主接线的新尝试

10kV配电间高压侧主接线和配电装置的正确选择与配电间可靠性、灵活性、经济性关系极大。论述了1台或2台变压器常用的高、低压侧的主接线,从主要电器负荷开关——熔断器组合电器入手,提出了双电源供电的3种模式,对它们进行了详细地分析比较。最后,推荐应优先采用组合电器的＂双＂线变组的主接线方案。     

500 kV变电站220 kV侧主接线运行分析

地区枢纽变电站的主接线形式对电网的经济性和供电可靠性有着至关重要的影响。500 kV变电站的500 kV侧主接线通常采用3/2断路器主接线,220 kV侧主接线设计仍然存在一定的争论,对比了多个已经运行多年的500 kV变电站,结合理论分析了各种主接线的优劣,并结合多年运行经验为今后的500 kV变电站220 kV侧的设计提出一些有用建议。     

济南特高压变电站500 kV 主接线方案

交流特高压接入负荷中心区域电网后,在输入区外电力的同时,使受端500 kV电网短路电流水平增加较多,如何控制电网短路电流成为一个重要课题。根据济南特高压变电站的具体落点和山东500 kV电网结构,通过多方案分析论证,提出了济南特高压变电站500 kV主接线采用一变两线单元接线方式。该接线在不改变500 kV 网架结构的基础上,可有效降低短路电流水平,且能满足电网安全可靠供电要求。     

500 kV变电站220 kV侧主接线运行分析

地区枢纽变电站的主接线形式对电网的经济性和供电可靠性有着至关重要的影响.500 kV变电站的500 kV侧主接线通常采用3/2断路器主接线,220 kV侧主接线设计仍然存在一定的争论,对比了多个已经运行多年的500 kV变电站,结合理论分析了各种主接线的优劣,并结合多年运行经验为今后的500 kV变电站220 kV侧的设计提出一些有用建议.     

10kV双电源供电用户配电间主接线的新尝试

电力是人们正常生活和工作的保障,但是在日常用电时,总会出现断电等情况,影响人们的正常工作和生活。为了能够缓解这样的电力事故情况,电力人员尝试对10kV双电源采取新的供电模式。正确选择10kV配电间高、低压侧的主接线和设备,可以提高配电间的灵活性、可靠性以及经济性。本文先讲述了1台变压器和2台变压器比较常用的高、低压侧的主接线,提出了2种双电源供电模式,并对它们的实用性进行了比较,根据最后结果发现组合电器的"双"线变组的主接线方案是最具有灵活性和经济性的。     

The effect of power quality on power-transformer reliability

This paper describes the effect of power quality on power-supply reliability by increasing the service life of insulation of a power transformer of a substation, which supplies consumers of different categories of power-supply reliability. The diagrams of the transformer failure-rate dependence on the length of its service life are given. The decrease in the turnaround cycle of a power transformer working with deteriorated power qualities is shown.     

考虑可中断负荷的微网能量优化

建立能量模型协调优化微网可靠性与经济性对系统经济效益的提高至关重要.考虑在并网模式和孤岛模式下都将可中断负荷纳入微网能量管理,优化各分布式电源DG(distributed generation)出力,并网时还包括微网与主网交换功率,使微网投资运行费用和补偿停电损失费用之和最小.该模型不但考虑了微型燃气轮机热(冷)电联供的发电特性,而且将热(冷)能供给优化转化为电能供给优化统一求解,回避冷热价格对模型求解影响,简化微网综合供能模型.以一个微网系统算例验证了模型和算法的有效性,计算结果表明该方法不但能确保微网负荷的可靠、经济供电,也有利于主网整体经济供电能力的提高.     

面向数据中心的高品质供电研究

数据中心现有供电方案一般需经过AC/DC和DC/AC 2次变换,同时不间断电源一般需通过逆变器为负载供电,其供电可靠性和供电质量有待进一步提高,为此提出一种面向数据中心的高品质供电方案。首先给出方案的拓扑结构,在此基础上分析了方案的工作原理及数学模型,并提出一种基于电压补偿、双电源功率均衡和紧急供电的协调控制策略,在MATLAB/Simulink中对面向数据中心高品质供电方案进行了仿真验证。研究结果表明,所提方案能够很好地补偿电网电压的暂升、暂降和谐波干扰等,实现双电源功率协调分配,保障双电源停电时的不间断供电。     

220kV降压变电所电气设计方案——电气主接线的选择与确定

电气主接线是构成电力系统的重要环节.主接线的确定对电力系统的可靠性和经济密切相关,并且对电气设备选择、配电装置布置、继电保护和控制方式的拟定有较大的影响.因此,必须正确合理确定主接线方案.     

Service Supply-Line Protection?An Industrial Plant User's View

Since electrical service supply to an industrial plant is very important, it deserves a careful examination of power-supply requirements, such as quality and reliability. The protection of the service supply line is more important to the plant operator than to the supplier of electrical power. A close engineering coordination between the plant operator and the power service supplier is necessary. for increased quality and reliability at optimum cost. Industrial plant power-supply requirements, system disturbances and their effects, and protective measures needed to meet plant electrical power supply requirements are presented.     

Quantitative and comparative analyses of the reliability of energy arrays

Energy arrays are widely used as a basic part of uninterrupted power-supply systems because they are thought to be more reliable than traditional mechanisms of uninterrupted power-supply sources. In addition, quantitative values of the reliability indices of such devices are absent in the technical literature. It is quite complicated to use the classical methods of assessing the reliability of energy arrays due to unconventional redundancy schemes (load-limited redundancy, hot stand-by). The analysis of failure intensity and restoration (replacement) intensity of the power units as constant values in an energy array results in the validity of the exponential law and provides the possibility to use Markov chains to calculate the device reliability. This article presents a graph of states of an uninterrupted power-supply source, the required mathematical apparatus to calculate the reliability indices, and their quantitative assessment. The calculation results indicate a wide variation of values of the cycle-to-failure, while the availability factor, being the most important indicator of reliability of the restored system, remains quite high.     

基于可靠性的电气主接线实例方案研究

以某特高压变电站为实例,根据该变电站在电力系统中的作用地位,变电站规划容量、负荷性质、线路、变压器元件总数、设备特点等条件,并应综合考虑供电可靠、运行灵活、操作检修方便、投资少和便于过渡或扩建等要求,对其500kV电气主接线进行技术经济分析比较,提出推荐方案。     

Adaptation of a traction DC power system for high-speed traffic

Ways to develop and improve traction power-supply systems and adapt them for high-speed highways are considered. One way to improve a traction power-supply system and make it more efficient is to increase the nominal voltage in the dc traction network up to 24 kV. This allows one to increase the throughput and carrying capacities of railways, increase the distance between substations, reduce the cross section of traction-network wires, and significantly reduce power losses in power-supply facilities. All this, alongside the absence of unbalanced supply voltage and inductive losses, as well as a significantly lower electromagnetic action on the infrastructure under dc conditions, results in a greater efficiency than in the case of any alternating- current traction power systems of alternating current. A mathematical model of dynamic electromagnetic processes in electrical circuits with semiconductor converters is fleshed out. Analysis and synthesis of electromagnetic processes and the main characteristics of multipulse converters, as well as a comprehensive technical and economic comparison, shows that 24-pulse rectifying circuits with a serial connection of threephase bridge are most efficient for these systems. These rectifiers provide an improvement in the quality of electrical energy not only for the primary power-supply system, but also for the traction network. They allow one to use simpler and more economical active-passive smoothing filters that provide the electromagnetic compatibility (EMC) of a new traction dc power system with the communication and railway automation facilities. In addition, the use of 24-pulse rectifiers can allow one to significantly reduce the consumption of reactive energy, reduce power losses in a traction network, and increase the efficiency of traction substations.     

环行配电线路安装TOSCAN-D3000C系统的实践与分析

介绍TOSCAN-D3000C系统在开封供电公司环形配电线路中的应用,以及安装前后的对比,极大地提高了配网线路的供电可靠性.     

抽水蓄能电站电气主接线方式的探讨

抽水蓄能电站是电力系统不断扩大过程中所产生的一种发电形式, 其作用是保证电力系统安全稳定运行和灵活经济调度。抽水蓄能电站电气主接线方式的选择, 应综合考虑抽水蓄能电站在电力系统中所处的地位、机组台数、容量大小、启动方式、自然条件等不同因素的影响, 进行全面的经济、技术比较, 以及可靠性评估和优化设计论证。