电气化铁路对宁东电网的影响分析

介绍了宁东电网电气化铁路牵引站的建设规模和供电情况,通过分析电铁的负荷特性,结合宁东电网的实际,分析了电铁负荷对电能质量、继电保护及自动装置、风电场以及电费计量的影响并提出相应对策,     

电气化铁路对电力系统的影响

文中分析了电气化铁路对电网的影响,对我国电气化铁路的发展、供电方式及其对电力系统的影响进行了综述。电气化铁路具有运量大、速度快、运费低、能耗较低、受自然影响小等优势,具有显著的经济和社会效益,是当前铁路发展的主要方向。同时电气化铁路牵引负荷是一种大功率单相整流负荷．它具有很大的移动性和波动性,产生的负序及谐波电流会对电网接入点的电能质量产生不利影响。总结了现有的治理措施。     

电气化铁路牵引变电站计量装置改造的方法探讨

本文阐述电气化铁路用电负荷的性质,电气化铁路牵引变电站电能计量装置存在的问题,介绍电气化铁路牵引变电站电能计量装置改造的方法,电能计量装置改造前后比较的效果,提出类似变电站计量装置的改造及设计意见。     

关于电力企业电能质量的探讨

随着科技的进步,现代电力系统中用电负荷结构发生了重大变化,诸如半导体整流器、晶闸管调压及变频调整装置、电气化铁路和家用电器等负荷迅速发展,由于其非线性、冲击性以及不平衡的用电特性,使电网的电压波形发生畸变成引起电压波动和闪变以及三相不平衡,甚至引起系统频率波动等,对供电电能质量造成严重的干扰或“污染”。文章主要阐述了电能质量的背景及技术创新。     

电气化铁路电能质量问题分析

伴随着中国经济的腾飞，电气化铁路由于在高速、重载、节能等方面有着明显的优势，取得了巨大的发展，同时，因其产生的电能质量问题日益严重。本文首先介绍了电气化铁路牵引变电站的电气系统和电力机车的特点，然后分析了电气化铁路运行产生的谐波和负序电流的特点，并分析了电气化铁路功率因子低以及接触网电压降落的问题，对电气化铁路电能质量分析有一定的借鉴意义。     

客运专线牵引供电系统电能质量检测装置的研究

一．研究意义 当代电力系统的负荷结构发生了很大的变化,随着电气化铁路建设的飞速发展,电气化铁路牵引供电系统也将在全国快速扩大。截至2007年,国家电网供电范围内已建成的牵引变电站共379座,在建牵引变电站25座。牵引变压器总容量共24807．9MVA,平均每台变压器容量为31．7MVA,单台牵引变压器最大容量达到150MVA。     

电气化铁路对电力系统的负序影响和治理措施的分析

由于电气化铁路牵引负荷的不对称性,会在电力系统中产生负序。本文分析了电气化铁路对电力系统的影响,并提出了治理措施。     

特殊负荷影响下的电压质量管理

随着国民经济和现代工业的高速发展,电力系统中的负荷日趋复杂化和多样化。电气化铁路、冶金等电网中大功率非线性、冲击性及波动性特殊负荷的大量应用,使得电网产生谐波、三相不平衡、电压波动与闪变等电能质量问题。特殊负荷对区域性电网甚至整个电力系统的影响已表现得十分明显与突出。本文对特殊负荷进行了定义,其产生电能质量问题进行了阐述,并对特殊负荷的管控和治理提出了相应措施。     

铁路牵引供电设备维修信息系统研究

根据当前国内对电气化铁路对牵引供电设备的安全可靠运行的要求,结合供电段的实际需求研究并设计了一套供电设备维修信息系统,本文介绍了供电段的业务需求,讨论了并初步实现了该系统的主框架。     

电气化铁路对电能计量装置的影响研究

着重分析了电气化铁路负荷对电能计量装置的影响,通过理论分析和试验,得出了对电气化铁路用户需采用合适参比电流的三相四线多功能电能表,并具备谐波计量功能,同时需对电能表反向计量功能进行改进的结论。     

Maintenance schedule optimisation for a railway power supply system

High reliability is the crucial requirement in railway operation and a power supply system is one of the key components of electrified railways. The cost-effectiveness of the maintenance works is also the concern of the railway operators while the time window on trackside maintenance is often limited. Maintenance scheduling is thus essential to uphold reliability and to reduce operation cost. It is however difficult to formulate the optimal schedule to meet both reliability and maintenance cost for a railway power supply system as a whole because of its functional complexity and demanding operation conditions. Maintenance scheduling models to achieve reliability and maintenance cost are proposed in this study. Optimisation algorithms are then developed to attain the solutions of the model. The applicability of the models and efficiency of the solution algorithms are demonstrated in an example. The proposed methods are vitally important for the railway engineers and operators to assure the service quality in the increasing demands of the modern electrified railways.     

交-直-交型电力机车网侧谐波对牵引变电所的影响及改进

本文分别对比介绍了新型交-直-交型大功率电力机车和以SS4为代表的传统型交-直型电力机车的主电路拓扑结构及其网侧电流谐波特性。由测试结果表明大功率电力机车与传统电力机车相比最显著的特征是其谐波特性不同,并分析了网侧谐波对牵引变电所电气设备造成的影响和采取的相应的技术改进措施,确保牵引供电系统的正常运行。     

牵引变压器绝缘在线监测技术研究

牵引变压器是牵引供电系统的重要组成部分之一,监测牵引变压器运行状态,及时地发现牵引变压器内部故障,对于确保高速铁路安全运行具有重要的意义。DGA技术是检测变压器潜伏性绝缘故障的有效措施之一。文章基于DSP技术,设计了一套牵引变压器DGA在线监测系统,经过实验室多次模拟试验,系统数据理想可靠。     

牵引变压器模糊故障诊断技术

牵引变压器是牵引供电系统的重要组成部分之一，对其DGA成分和含量进行在线监测并进行故障判断，能有效地提高电气化铁路运行可靠性。目前对变压器的故障性质判断大多是根据IEC三比值法进行的。而实践中，一些DGA结果与已存在的IEC编码不符，或造成缺码现象。论文采用模糊三比值诊断法进行故障性质判断能有效地解决这一问题。     

Fundamental performance of novel power supply for HTS magnet using solar energy system

A technical fusion is an important option to establish renewal development in the mutual fields. We have proposed a novel superconducting power supply that is combined with superconducting power supply and solar energy system. An eternal electric energy can be converted by solar energy system, which contains solar panel, photovoltaic (PV) controller and energy-storing battery, can be utilized in the utility power of superconducting power applications. The novel power supply could operate without external utility power to charge the HTS load magnet due to the solar energy. We can improve the operating efficiency and install it in remote locations where utility power is not available. In this paper, as a first step of this work, we showed the possibility of technical fusion between a superconducting power supply and a solar energy system.     

21世纪电力工业的一个重要发展方向 --超导电力技术

随着人们对环境与资源保护意识的增强,对生活方式的改善以及信息化社会的发展,对电力系统的经济性、供电可靠性、供电质量、供电容量和密度将提出更高的要求。对于这些要求,仅用常规技术是很难适应社会的进步对电力系统的需求的。在21世纪,迫切希望电力工业开展重大的技术革新,超导技术的应用,将是电力工业在21世纪的重要发展方向。文章系统地分析了未来电力工业所面临的困难和课题,论述了超导应用技术在未来电力系统中的地位,并简要地介绍了超导电力技术的发展现状。     

Harmonic power flow analysis for the measurement of the electricpower quality

The number and power of loads that pollute, from an electric point of view, the electric network are constantly increasing. Their connection to the electric network causes a significant distortion in the line current and, when their overall power is no longer negligible with respect to the network power, also some distortion in the line voltage, thus deteriorating the electric supply quality. The paper proposes a method, based on the evaluation of the harmonic powers, to identify whether the source producing harmonic distortion in the line currents and voltages of a three-phase system is a polluting load connected after the metering section or is the distortion of the line voltages. Some parameters are also defined in order to quantify the effects of the polluting load on the power quality. A Virtual Instrument is also described, realized to implement the proposed method and to verify it experimentally. The instrument accuracy is discussed     

Index,IAPA 2007

Egypt National Railway trains (passenger and freight) are currently operated with diesel traction, except for two electrified Metro lines in Cairo of about 55 km in length. An electrified rail system could have a number of operational and environmental benefits. This paper examines the economic and financial viability of a proposed electrification scheme for the Cairo—Alexandria railway line. The framework of appraisal developed identifies the potential direct and indirect benefits of the scheme, and its costs. The evaluation of different types of costs and benefits included a sequence of analytical steps. The results showed that the scheme achieves only about 9% internal rate of return. However, applying a broader cost-benefit analysis to include all sources of benefits shows that it is highly desirable on an economic basis. Despite the extreme difficulty of obtaining the required data and information, plausible and coherent results were achieved, which are also seen to be consistent with other results of electrification schemes in Europe.     

极端灾害下基于智能楼宇分布式电源的配电系统负荷恢复力评估分析

作为一类重要的负荷侧资源,智能楼宇中广泛存在的各类分布式电源为极端灾害后电力系统的供电快速恢复及负荷转带提供了新的可能性。为此,提出一种针对智能楼宇负荷恢复力的综合评估框架,用于定量分析和计算极端灾害后智能楼宇末端存活分布式电源对配电系统中重要负荷的转带能力。在对智能楼宇内不同类型物理设备进行建模的基础上,重点考虑多能互补及能量耦合特性,首先,提出了电能转移量、热能转移量、冷能转移量3项定量评价指标,用于精确量化极端灾害后智能楼宇电源对系统负荷恢复的贡献。其次,在此基础上,通过综合利用随机混合整数规划方法,进一步提出了针对上述评价指标的具体计算方法。最后,以某一工业园区负荷为例,对所提评估框架进行有效性验证。仿真结果表明,所提方法在保证智能楼宇正常运行前提下可充分发掘智能楼宇的能源供应潜力,有效提升配电系统在极端灾害下的供能可靠性。     

电气化铁道对无功电能计量影响的研究

电气化铁道为电网注入了大量谐波电流,降低了电网电能质量.而目前谐波对无功电能表计量特性影响的研究还不完善.文章在传统无功功率定义的基础上,按照C.Budeanu频域法,给出谐波下非正弦无功功率的定义,并且比较了电气化铁道中谐波对目前无功计量两种电能表的准确度影响,给出了电气化铁道中无功电能表的选择原则.