发电机离相封闭母线绝缘在线监测系统设计

设计了一种针对发电机离相封闭母线的绝缘在线监测系统.该系统采用分布式设计,通过对离相封闭母线内部的空气露点温度和绝缘子表面的放电隋况进行监测,实现对离相封闭母线绝缘水平的实时监测和综合评估.利用对监测数据的分析判断,对可能存在的脏污、受潮和结露风险进行报警.     

大容量离相封闭母线轴向焊接与电动力分析

随着发电机组容量越来越大,短路故障中离相封闭母线所受电动力也变得更大。在离相封闭母线的相关国家和行业标准中,对母线轴向焊缝焊接要求不明确。文中结合国内某1 250 MWe级核电项目离相封闭母线技术参数,对母线进行了短路故障下的受力分析,同时提出了大容量离相封闭母线轴向焊缝焊接要求建议。     

全连式离相封闭母线轴向直缝焊接要求探讨

在全连式离相封闭母线的相关国家和行业标准中,对母线轴向直缝焊接要求不明确。结合国内某APl000核电项目离相封闭母线技术参数和焊接情况,对母线进行了受力分析。根据分析结果,提出了全连式离相封闭母线直焊缝焊接要求建议。     

风冷离相封闭母线的初步研究

大型发电机组对离相封闭母线的载流量提出了更高的要求,从经济性和节省空间考虑,３０ＫＡ以上的封闭母线必须采用强迫冷却的离相封闭母线。     

浅析机组安装期间IPB及其附属系统关注点

正介绍了大型发电机组安装期间离相封闭母线(IPB)及其附属系统易忽略的关注点,找出其原因,并提出相应的防范措施,为后续机组IPB及其附属系统的安装提供借鉴。离相封闭母线(Isolated Phase Enclosed Bus,IPB)为全连式、自然冷却离相封闭母线。其主要用于发电机、励磁变压器、发电机出口电压互感器、发电机断路器、主变压器低压侧电压互感器及高压厂用变压器间的连接。从发电机主引出线至主变压器低压侧△回路分支处的离相封闭母线(含短路试验段)称为"主回路母线";从△回路分支处至主变压器低压套管的离相封闭母线称为"△回路母线";从主回路母线引接     

风冷式封闭母线在岭澳核电工程中的实践

在分析强迫冷却式（简称风冷式）离相封闭母线技术特点的基础上,根据大型核电站大电流、常规岛厂房尺寸不大的实际情况,提出了岭澳核电站二期工程2台兆瓦级压水堆核电机组采用风冷式离相封闭母线的设计方案,介绍了冷却系统、控制系统、母线接地方式和相关设备优化布置的设计思想。该设计方案为国内大电流风冷式离相封闭母线的设计应用提供了方向和思路。     

绝缘子受潮导致机组跳闸的分析及预防

介绍某电厂机组并网初期,发电机定子接地保护动作跳机事件及检查经过。指出保护动作是由于发电机分支回路——高厂变离相封闭母线内盆式绝缘子受潮放电引起的。分析了高厂变封闭母线内盆式绝缘子管理中存在的薄弱环节,提出了绝缘子防潮管理措施,以杜绝类似事件发生。     

离相封闭母线运行中放电声音的检查处理

正发电机出口大电流离相封闭母线因其使用方便、运行维护工作量小、钢结构发热少、安全和可靠性高、不受环境和外物的影响等诸多优点而被广泛采用,提高了机组运行的安全水平。但是在运行中也出现了一些问题,尤其是在新投运的电站问题更为突出。1事件经过2010-04-26,某电厂设备班组人员在巡检中发现,1号发电机出口离相封闭母线C相内有间歇性放电声音。放电声音来自发电机与发电机出口断路器之间的竖直段内,初步判断可能是由于支持绝     

浅谈离相封闭母线运行与维护中隐患的解决措施

全连式离相封闭母线以其独特的优势,在国内许多大型火力发电机组中得到广泛的应用,但在长期的运行中存在绝缘水平降低、漏氢、闪络和外壳过热等问题。针对全连式离相封闭母线在运行和维护中存在的问题进行了分析,并提出了解决措施。     

小离相封闭母线与共箱封闭母线在厂用电系统的应用

高压厂用电电源母线作为连接高压厂用变压器低压侧和高压厂用配电装置之间的关键导体,对火力发电厂的安全运行意义重大。介绍了大型火力发电厂高压厂用电母线型式、原则接线及参数,分析了小离相封闭母线和共箱封闭母线的结构、优缺点和运行业绩,并对两者进行了技术和经济比较,推荐小离相封闭母线在沿海大型火力发电厂厂用电系统中应用。     

大唐鲁北发电厂330MW发电机组进相运行分析

为防止在负荷低谷时滨州地区电网无功过剩,导致电压超过允许范围,因此对大唐鲁北发电厂330MW发电机组做进相运行试验。本文给出了在不同有功出力进相运行时测定的定子各端部温升、220kV母线电压、厂用母线电压及静态稳定的功角,分析讨论后并得出结论。     

Design of a model reference adaptive stabilizer for the exciter andgovernor loops of power generators

The authors present a decentralized model reference adaptive control (DMRAC) scheme for the design of power system stabilizers (PSS) and a means for coordinating the generating unit excitation and governor control loops. In the excitation and governor control loops. In the proposed scheme, the state variables of the generating unit (GU) are to track those of an explicitly specified reference system which is designed to have desirable performance characteristics. The adaptive control law for coordinating the exciter-governor stabilizer signals is derived from a Lyapunov energy function, and thus assures system stability. Decentralized regulation and tracking tests on simulated one-machine infinite bus system show significant improvement in system performance     

Clonal selection algorithm for power generators maintenance scheduling

This paper introduces a technique based on the one of the artificial immune system (AIS) technique known as the clonal selection algorithm (CSA) to obtain the optimal maintenance schedule outage of generating units. Based on a weekly load profile, the proposed technique provides the optimal maintenance window and calculates the optimal output power from each generator over a one year horizon. The maintenance scheduling problem is decoupled into two interrelated sub-problems namely, the maintenance scheduling and the power system sub-problems. The CSA is used to solve the maintenance scheduling subproblem to obtain the optimal maintenance outage of each unit. Based on the schedule generated by the CSA, the economic dispatch iterative lambda technique is used to find the optimal output power from each unit. Due to the search nature of the CSA, infeasible solutions may be introduced during the solution process. Therefore, a local search technique is used to watch the feasibility of the new solutions. The paper reports test results of the proposed algorithm to find the optimal maintenance schedule of the IEEE 30 bus system with 6 generating units and the IEEE 118 bus system with 33 generating units. Results are compared against the results obtained by complementary decision variables structure (CDV) and the evolutionary programming based techniques. Results are encouraging and indicate the viability of the proposed CSA technique.     

Thermal unit commitment using binary/real coded artificial bee colony algorithm

This paper presents a binary/real coded artificial bee colony (BRABC) algorithm to solve the thermal unit commitment problem (UCP). A novel binary coded ABC with repair strategies is used to obtain a feasible commitment schedule for each generating unit, satisfying spinning reserve and minimum up/down time constraints. Economic dispatch is carried out using real coded ABC for the feasible commitment obtained in each interval. In addition, non-linearities like valve-point effect, prohibited operating zones and multiple fuel options are included in the fuel cost functions. The effectiveness of the proposed algorithm has been tested on a standard ten-unit system, on IEEE 118-bus test system and IEEE RTS 24 bus system. Results obtained show that the proposed binary ABC is efficient in generating feasible schedules.     

广东惠州液化天然气电厂厂用电系统的设计特点

燃气机组具有起动迅速的特点,故一般设计为电网调峰电厂,采用每天两班制运行方式。惠州燃机电厂厂用电系统的高压厂变选用双卷变压器、中压厂用母线段设计为一段、高压厂用电系统中性点采用高阻接地方式、不设高压公用母线、每台机组均设置一段交流保安电源,这种厂用电系统设计合理、操作维护方便。     

新一代智能变电站母线合并单元工程应用技术研究

当母线合并单元故障,众多间隔的二次装置失压。在智能变电站扩建时,因母线合并单元输入输出通信协议不标准,新增间隔电子互感器(含合并单元)接入困难。采用母线电压互感器按终期新建、间隔合并单元级联按母线段划分、母线合并单元SV/FT3插件冗余等方法,使母线合并单元工程应用合理化。提出标准化合并单元规约、简化过程层网络建议,解决母线合并单元在变电站二次设备中的瓶颈问题。     

华东区域电力市场省(市)发电竞价结果安全校核及优化调整系统

发电计划安全校核及优化调整是电力调度管理方面的传统课题,华东区域电力市场运营对这一课题提出了新的要求,本文在综合考虑新的需求基础上,开发了一套针对华东区域电力市场中省(市)级调度交易中心应用的安全校核及校正系统。系统所需的网络拓扑、机组参数、发电计划、母线负荷、联络线潮流、检修计划、稳定限额等数据均采用XML文件为媒介,系统自动从调度实时信息平台读取这些文件,经解析、等值和转换处理,建立计算模型,依照市场规则进行安全校核和校正计算并向市场上传校正计算结果,作为市场竞价出清的约束条件。此外,系统在模型建立及图形显示、平衡节点选择、联络线计划处理、母线分裂运行、应急运行方案等方面也具有特色。     

智能变电站简易母线保护

分析了低压母线的保护配置现状,提出了一种简易母线保护新方案。该方案根据低压母线主接线特点抽象出母线单元模块,各母线单元模块根据本母线进线、分段开关的过流情况及其他母线单元模块的开关过流情况,结合出线保护的闭锁信号,实现小电源、进线和分段的选择性跳闸,达到快速切除母线故障的目的。     

Dynamic stability and optimal excitation control of doubly excited synchronous machine: Influence of load characteristics

This paper is concerned with the effects of connected loads on the optimal excitation control and dynamic stability of power systems, incorporating doubly excited synchronous generators. The system studied is made up of a generating unit with local load and a transmission line connecting the machine to an infinite bus.A number of operating conditions are examined, and different system parameters used in order to identify effects attributable to the regulators, tie-line reactance, and the characteristics of the local load. For purposes of comparison, corresponding results of dynamic stability studies are also presented for the system with a conventional synchronous machine.     

Fault detection in transmission networks of power systems

An online fault detection scheme for a sample power system is introduced in this paper. The detection approach is based on the use of a variable structure system called “sliding mode observer”, where information contained in the output measurements is utilized to detect the onset of faults in the transmission network of the sample power system in real time and online. The power system comprises a generating unit connected to an infinite bus through double line transmission network. The common case of a fault occurring on a transmission line is illustrated through simulation studies.