四极开关应用研究

从四极开关在不同接地系统、住宅、公建和厂房的实际应用入手,通过对国家规范的解释和实例分析,明确和正确理解分析和说明四极开关的应用场合以帮助设计人员正确理解,优化设计,减少电气安全隐患的产生。     

农网低压综合配电箱设计及电器元件的配置

针对农网低压台区目前运行的综合配电箱存在的问题,提出了配电箱箱体防雨、散热的具体方案,同时提出了综合配电箱电器元件配置方案和农电配网无功补偿部分电器元件方案。     

桥头铝电五期通信电源系统故障解析方法

文章介绍了桥头铝电五期通信电源系统CGY48240的模块化设计思路,对通信电源各模块故障的严重程度进行划分,并根据模块设计思路对故障进行分析,对可能造成通信系统中断的故障提出了应急处理办法。     

单片机低压监控装置的抗干扰研究

为提高以单片机为核心设计的低压监控装置的可靠性,本文对装置的抗干扰技术进行了研究。借助理论分析和干扰实验,分析了低压监控环境下的干扰因素,将主要干扰确定为接触器控制线圈导通或分断时产生的过电压。据此,在抑制干扰源、切断干扰传播路径和提高敏感器件抗干扰能力等方面提出了详尽的硬件抗干扰措施,其有效性已通过计算机仿真和工程实践得到验证。     

SVC位置和容量的灵敏度和概率分析

可控并补装置位置和容量的合理选择,有助于提高电网运行安全性和经济性。确定运行方式下节点电压对并联电纳的灵敏度指标,反映了有效并补位置,但非必要补偿位置。文中提出采用灵敏度和概率潮流算法,综合确定实际需要并补位置。根据随机故障后并联电纳的概率分布,确定固定和可控补偿容量比例。研究结果表明:根据并补电纳的区间概率分布,可确定可控并补容量及其满足电压控制目标的概率;补偿容量不仅受电网故障方式,也与并补装置电压设定值有关。     

Volt/Var control in a distribution system by a fuzzy optimization approach

This paper presents a fuzzy optimization approach for solving the Volt/Var control problem in a distribution system with uncertainties. Wind turbines are being considered in the study distribution system. The main purpose is to find an optimum combination of tap position for the main transformer under load tap changer (ULTC) and on/off status for switched capacitors in a day to minimize the voltage deviation on the secondary bus of the main transformer, reactive power flow through the main transformer and real power loss on feeders. When performing the Volt/Var control problem in conventional methods, the hourly load and wind speed must be forecasted to prevent errors. However, actually there are always errors in these forecasted values. A characteristic feature of the proposed fuzzy optimization approach is that the forecast hourly load and wind speed errors can be taken into account using fuzzy sets. Fuzzy set notations in the load demand, wind speed, voltage deviation on the secondary bus, reactive power flow through the main transformer and total real power loss on feeders are developed to obtain the optimal dispatching schedule under an uncertain environment. To demonstrate the effectiveness of the proposed method, the Volt/Var control problem is performed in a distribution system within the service area of Yunlin District Office of Taiwan Power Company (TPC). The results show that a proper dispatching schedule for ULTC position and capacitor switching operation can be reached using the proposed method.     

DG integrated multistage distribution system expansion planning

In this paper, a framework is presented to solve the problem of multistage distribution system expansion planning in which installation and/or reinforcement of substations, feeders and distributed generation units are taken into consideration as possible solutions for system capacity expansion. The proposed formulation considers investment, operation, and outage costs of the system. The expansion methodology is based on pseudo-dynamic procedure. A combined genetic algorithm (GA) and optimal power flow (OPF) is developed as an optimization tool to solve the problem. The performance of the proposed approach is assessed and illustrated by numerical studies on a typical distribution system.     

基于有限元法的汽轮机轴系磨损故障处理

汽轮机轴系磨损部位的合理处理关系到机组的运行安全,为了使处理方案更加科学合理,采用有限元软件ANSYS建立轴系磨损部位的局部有限元模型;通过合理设置边界条件,求出了不同处理方案下磨损部位的应力集中系数,为方案的优化选择提供依据。以某电厂磨损故障为例,采用该方法对处理方案进行优化,计算结果表明,优化后的方案较大幅度地降低了磨损部位的应力集中系数,为机组的安全运行提供了可靠的保障,说明该方法是有效可行的。本文提出的方法适用于类似故障的处理。     

火电厂管道螺纹吊杆最大使用荷载计算研究

火电厂管道螺纹吊杆最大使用荷载是设计和选择螺纹吊杆的重要依据,然而现有的相关规定给出的结果并不相同,造成在相同设计条件下选择的螺纹吊杆规格并不相同,影响了螺纹吊杆的准确设计和选择。为规范螺纹吊杆的设计和选择,确保火电厂的安全和经济运行,对螺纹吊杆最大使用荷载的相关问题进行了分析和探讨。分析和探讨了与螺纹吊杆最大使用荷载有关的螺纹根部截面积计算方法、许用应力确定以及材质选择等问题,并给出了相应的措施和建议。分析和研究了螺纹吊杆最大使用荷载计算方法,基于许用应力法给出了螺纹吊杆最大使用荷载计算结果。     

配电自动化主站系统建设方案分析

结合某城市智能电网配电自动化试点建设,介绍配电自动化主站系统的建设原则和可实现的功能,提出软硬件平台的具体设计和配置,以及使用信息交换总线技术实现配电自动化系统与相关系统交互的方案,并对建设方案的可行性进行了分析。