垃圾焚烧发电技术主要问题及其对策

介绍了我国城市生活垃圾的主要处理方式;通过对国内外情况的比较与分析,得出我国城市生活垃圾处理的最佳方式是CFB焚烧(垃圾与煤可混烧)发电;介绍了CFB发电技术的特点、工艺流程、存在的问题及未来的发展前景。     

Mechanism of simultaneous tripping of ground directional relays in a 6.6‐kV distribution system

In Kyushu Electric Power's 6.6‐kV distribution system, after a single‐phase ground fault occurred in the circuit of a distribution line, we experienced a phenomenon in which the analogue ground directional relays of the other circuits linked to the same bank were simultaneously tripped. In this paper, focus is placed on the mechanism and possibility of simultaneous tripping of ground directional relays. This mechanism was examined in an experiment carried out using an analogue simulator. The results of the test revealed that such simultaneous tripping was attributable to the neutral instability phenomenon of grounding potential transformers installed in an isolated neutral system. © 2010 Wiley Periodicals, Inc. Electr Eng Jpn, 171(2): 23–30, 2010; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.20919     

巨型浮吊船电力系统动态响应的联想记忆识别

巨型浮吊海洋工程船的作业依赖于船舶电力系统的稳定运行。这类船上大功率变频器、大功率交流电机等设备的大量应用,使得控制系统受干扰影响严重,检测到的动态响应常常含有干扰成分,给电力自动化设备的反馈控制带来了困难。联想记忆具有按信息内容检索的功能,可以模仿人脑进行联想,处理缺损和不确定的信息,具有容错功能。根据联想记忆原理,运用Hopfield网络结构,对Hebb学习规则进行了改进,构建了自联想离散Hopfield网络。该网络通过对动态响应标准样本进行学习,得到了稳定模式,在受干扰污染、信息缺损的巨型浮吊船电力系统动态响应的识别中表现出了良好的滤除干扰的能力。     

从水坝工程看我国公众理解工程的问题与对策

At present, the study of “public understanding of engineering” in China has just started, and it can be said that there is adequate research space. Making the public understanding of dams in China as a starting point, this paper analyzes the importance and the present situation of “public understanding of engineering”, and makes some analysis and recommendations on how to promote and facilitate the public understanding of engineering.     

直接电流控制的配电网静止无功补偿器研制

研制了±50kV.A的配电网静止同步补偿器(Distribution Static Synchronous Compensator,简称DSTATCOM)。其硬件主电路以IGBT功率模块为开关器件,采用PWM整流器结构。通过检测电路采集电流电压信号,利用TMS320F2812型DSP处理器进行算法处理和PWM脉冲输出。为提高系统的动态性能,采用直接电流控制策略,通过矢量变换消除静态误差,提高PWM开关频率等措施来减少输出谐波。实验结果验证了该方案的正确性。     

小区电力远程智能管理控制系统研究——防盗电灵活接线系统

文章提出配电接线系统综合布线思想,完成了系统主要部件的功能设计和电气设计。该接线系统与武汉供电公司多用户电能集中检测控制器配合使用,较好地解决了防窃电和消除配电接线火灾隐患难题。接线系统施工方便,降低了工程造价。     

基于负序电压分布的发电机定子匝间短路保护

提出发电机定子绕组匝间短路保护新判据方法,包括主判据和闭锁判据.主判据由发电机机端负序电压和中性点负序电流构成;闭锁判据由发电机机端负序电压、主变高压侧负序电压、主变中压侧负序电压、高厂变1分支负序电压、高厂变2分支负序电压构成.如果主判据为真,再判断闭锁判据是否为真,如果闭锁判据也为真,则立即闭锁保护,否则延时保护动作并发告警信号.所提方法不仅可对发电机的各种非对称故障进行反应,还可以对主变及厂用变压器的一部分内部故障进行反应;与纵向零序电压方案相比较,可不增加一次设备并且容易双重化;在靠近发电机中性点处相间故障时,可得到较高的灵敏度.     

M701F型燃气轮机的在线运行负荷特性

分析了重型燃气轮机负荷特性的影响因素,提出了研究重型燃气轮机负荷特性的技术路线。基于此,针对某M701F型燃气轮机,以国际标准化组织(International Organization for Standardization,ISO)的标准条件为基准,由机组的在线运行数据获得其负荷特性曲线,并建立负荷特性的数学模型。考察该燃气轮机6 940组实际数据,得出结论:当折算基准功率不小于18MW时,其负荷特性数学模型的最大相对误差不超过5.73%。     

A test of independence based on a generalized correlation function

In this paper, we propose a novel test of independence based on the concept of correntropy. We explore correntropy from a statistical perspective and discuss its properties in the context of testing independence. We introduce the novel concept of parametric correntropy and design a test of independence based on it. We further discuss how the proposed test relaxes the assumption of Gaussianity. Finally, we discuss some computational issues related to the proposed method and compare it with state-of-the-art techniques.     

气动工具的噪声防治

气动工具在我国机械制造等各行业广泛应用的同时,工作时的排气噪声对周围环境也造成了一定的污染。介绍了治理噪声所采用的消声装置及设计方法,通过消声后的试验数据及噪声频譜对比分析,用正交试验法解决功率与噪声的矛盾,通过这种方法使噪音降低最大,功率损耗最小,这种消声装置原理治理噪声效果显著。