南方五省区分布式电源对电网的影响分析

分布式电源以其环保、高效及灵活的优点逐渐渗透到电网当中,也给输电网与配电网的发展规划带来一定的影响。从输电网规划建设、配电网的供电可靠性及继电保护等方面讨论了南方电网中分布式电源接入对电网的影响,为南方电网未来分布式电源的快速发展提供了重要的参考。     

Generation Adequacy: Who Decides?

While market-based methods for generation expansion are the preferred long-term approach, there is currently too much uncertainty regarding how consumers and suppliers will respond to spot price signals. Therefore, policymakers should encourage demand-side experiments and investments to ensure that, when prices rise, customers will be able to respond.     

±1 100 kV换流站户内直流场智能巡检系统设计

提出±1 100 kV换流站户内直流场智能巡检系统设计方案,满足±1 100 kV特高压换流站户内直流场设备正常运行而产生的恶劣电磁环境下不进人设计的巡检要求。运行人员不需进入直流场内即可完成直流场主设备日常巡检,配置双重化的智能巡检设备和巡检设备人工回收的设计方案,既提高巡检的可靠性,又能保证在单套巡检设备出现故障时及时进行维修。设计方案提高了巡检工作的自动化程度,系统既能满足资产全寿命周期管理要求,又提高设备可靠性和电网安全性。     

A fault location criterion for MTDC transmission lines using transient current characteristics

Multi-terminal DC (MTDC) transmission system is applied in modern power systems due to its technical features. In an MTDC system, the converter stations are generally connected in parallel. To smooth the DC current output from the converter, the smoothing reactors are integrated in the converter outputs, instead of in the DC transmission line. When a fault occurs on the DC transmission line of the MTDC system, the fault current will flow along the whole DC line. As a result, the protection scheme may not locate the fault accurately. Based on the characteristics of DC filter, this paper analyzes the impedance characteristics of the combinational circuits, and proposes a method to identify the fault location by the characteristic harmonic. A protection criterion of the non-integer harmonics comparison is composed with phase-frequency characteristics curve derived from complex wavelet transform. The inevitable blind zone is analyzed in theory which exists on the terminal of transmission lines just like distance protection in AC systems. The algorithm is successfully tested and compared with other techniques.     

基于数据空间的电网高级应用分析系统

随着电力计算机应用系统的不断发展,各应用系统间的融合性问题需通过各类软硬件资源的共享予以解决。阐述了基于数据空间的电网高级应用分析系统的设计方案,介绍了该系统的结构体系,具体研究了系统的数据中心和数据空间、分布式平台、虚拟化技术、画面和数据显示等关键技术。在广东电网公司的应用实践证明,该系统具有高可用性、服务多样性及良好的扩展能力。     

智能变电站远动快速对点系统研究

在智能变电站远动装置校核系统的基础上,以模块化思想设计了远动快速对点系统,以和校验算法校对分析了调度主站与变电站端对点表。系统主要是在远动装置校核系统构建映射表的前提下,通过与调度主站实时通信,从而实现自动对点。应用表明,其快速对点效率是普通调试模式25倍,可实现自动快速对点工作。     

蓄能水电站异构复杂场景无线应急通信研究

应急通信为各类紧急情况提供及时有效的通信保障,是综合应急保障体系的重要组成部分,其重要性日益提升。蓄能水电站多数处于位于深山大谷中,占地面积广,与外界联系不便,对应急通信系统提出了更高的要求。提出四种主流的无线应急技术方案,并对方案优缺点进行分析对比,最后提出一种厂区与指挥中心应急通信的解决方案。     

A simulated model for a once-through boiler by parameter adjustment based on genetic algorithms

In this paper based on the physical rules, thermodynamics principles and energy mass balance, the simulation models are developed and applied to electrical power generating plants in order to characterize the essential dynamic behavior of the boiler subsystems and to use the corresponding models for the power plant processes. These models are developed for a sub-critical once through Benson type boiler based on the experimental data obtained from a complete set of field experiments. An optimization approach based on genetic algorithm (GA) is executed to estimate the model parameters and fit the models response on the real system dynamics. Comparison between the responses of the corresponding models with the response of the real plants validates the accuracy and performance of modeling approach. A similar comparison between the responses of these models with linear parametric models shows the effectiveness and feasibility of the developed model in term of more accurate and less deviation between the responses of the models and the corresponding subsystems.     

高压直流输电工程非常规接地极运行方案

为解决高压直流输电工程常规接地极未能建成时直流双极投产问题,提出站内深井接地极和站外简易接地极的非常规接地极运行方案,并对接地极电气性能、人身安全、接地极发热、变压器直流偏磁和转移电位开展研究。主要结论如下:站内深井接地极方案具备技术可行性,但需采取隔离措施避免站内接地网感应较高的直流电位危及设备和人身安全;站外简易接地极方案在单极大地运行方式下跨步电压和接地极温升难以满足要求,应采取不平衡电流控制措施以保障接地极附近的设备和人身安全。     

关于脱硝在线监测的难点分析及对策

随着脱硝补贴电价政策的贯彻与落实,脱硝状态在线监测与脱硝电量核算显得越发重要.本文以广东电网为例,首先简要介绍了脱硝在线监测系统的系统结构.接着介绍了脱硝在线监测系统建设的主要难点及相应的解决措施,主要包括：数据准确性、脱硝电量核算、脱硝设施投运率等.最后,通过对试点电厂燃煤机组脱硝电量数据进行对比分析,结果表明主要难点问题得到了有效解决,它为系统的大力推广起了示范作用.