高电厂用变压器低压绕组间电动机反馈电流的计算

根据电动机的短路特性,建立了电动机反馈电流等值模型,并对大容量机组高压厂用变压器低压绕组间电动机反馈电流进行了分析和计算.     

一种新型同步发电机数据采集系统

本文介绍了一种新型同步发电机数据采集系统设计方案，硬件设计上使用了32位ARM微型处理器，采用具有DSP内核的能量专用计量芯片ADE7758代替普通AD转换芯片。其特点是数据采集速度快、实时性好、价格低。     

发电机励磁系统参数辨识的仿真研究

研究发电机励磁系统参数辩识问题,由于励磁系统是一个非线性系统,造成电力系统不稳定.传统时域或频域辩识方法不能辩识其非线性环节,导致励磁系统辩识的精度低.为了提高发电机励磁系统的辩识精度,提出一种神经网络的发电机励磁系统参数非线性辨识方法.以发电机励磁系统实际输入作为神经网络的输入,以实际励磁系统输出与神经网络输出之间的最小误差作为目标函数,通过不断调整神经网络的权值对神经网络模型进行优化,最后得到满足系统误差要求的发电机励磁系统参数.仿真结果表明,改进方法解决了传统辩识方法无法准确辩识励磁系统非线性环节的难题,有效提高了励磁系统的辨识精度.     

Design,analysis, and construction of a small scale self-excited induction generator for a wind energy application

This paper proposes the design, analysis, and construction of a three phase, 0.75 kW, 220/380 V, 3.4/2.0 A, Δ/Y connected, 4 poles, SEIG (self-excited induction generator) based on empirical rules. The designed SEIG offers improved high efficiency and power quality. The design takes into consideration a skew effect and power quality. A 2D-FEA (2 dimension finite element analysis) is used to consider core loss, flux density and circuit parameters of the designed SEIG. The designed SEIG has been tested and compared with a standard SEIG under various operating conditions in terms of efficiency and power quality. Consideration of capacitance for the SEIG based on steady-state equivalent circuit model and a power flow diagram is also given. Research results can be guidelines and recommendations for development of small wind induction generators for effective electricity generation.     

光隔离器用法拉第旋转器的Mueller矩阵形式

本文通过分析在理想情况下不同偏振态的光经过法拉第旋转器前后Ｓｔｏｋｅｓ矢量的变化，从理论上导出理想的光隔离器用法拉第旋转器的Ｍｕｅｌｌｅｒ矩阵形式。     

Power Evaluation of the Los Angeles Oxygen–Fed Ozone System

The Los Angeles Department of Water and Power (LADWP) operates a 600 mgd (2,270 ML/day) direct filtration water treatment plant which includes a 7,900 lb/day (149 kg/hr) ozonation system. Ozone is applied as a preoxidant for the purposes of disinfection and microflocculation. The ozonation system is unique in that high purity oxygen is generated on–site and is used as the feed–gas in a once–through system. The process was selected through competitive bids and evaluated for total present worth from 20–year life cycle costs which included capital plus energy expenses. Power consumption (and penalty) was valued at $6,500/kW. System power demand was measured at nine ozone production rates. A minimum specific energy of 6.5 kWh/lb (14.3 kWh/kg) of ozone was observed when generating ozone at a concentration between 5 and 6 % (wt) [65 and 80 g/m³; where the standard temperature and pressure are 70F (21.11 C) and 1 atm, respectively]. The test methodology and data assessment considerations were developed jointly by the owner and manufacturer, and produced results with practical significance beyond the performance testing objective.     

发电机辅机系统的特点及其调试

主要概述发电机辅机气体冷却系统，定子冷却水系统，密封油系统的特点，对调试中出现的问题加以分析，给出了解决办法。     

浅谈发电机的起励方法

简介发电机常用的起励方法,指出其不足之处,然后重点介绍了一种接线简单、工作可靠并成功地运用在多个电站的采用电解电容器充放电作为助磁的起励新方法。     

6kW柴油发电机组稳态与动态过程的仿真与分析

发电机组是由内燃机和发电机构成的发电系统。出于柴油发电机组系统仿真效率和精度的需要,提出了一种基于AMESim虚拟环境的软件仿真方案。根据6k W柴油发电机组的结构形式利用各应用库中的元件建立了机组的系统仿真模型;对机组进行不同转速下的稳定输出电压和额定负载下的气缸压力仿真,并与试验数据对比证明了模型的正确性;在此基础上,对机组进行了空载起动特性和带负载特性仿真,结果表明6柴油发电机组转速瞬态调整率较小,调节时间亦较短,能够显示良好的动态特性。     

The development of confocal arthroscopy as optical histology for rotator cuff tendinopathy

MRI, ultrasound and video arthroscopy are traditional imaging technologies for noninvasive or minimal invasive assessment of the rotator cuff tendon pathology. However, these imaging modalities do not have sufficient resolution to demonstrate the pathology of rotator cuff tendons at a microstructural level. Therefore, they are insensitive to low‐level tendon diseases. Although traditional histology can be used to analyze the physiology of rotator cuff tendons, it requires biopsy that traumatizes the rotator cuff, thus, potentially comprising the mechanical properties of tendons. Besides, it cannot offer real‐time histological information. Confocal endoscopy offers a way to assess the microstructural disorder in tissues without biopsy. However, the application of this useful technique for detecting low‐level tendon diseases has been restricted by using clinical grade fluorescent contrast agent to acquire high‐resolution microstructural images of tendons. In this study, using a clinical grade sodium fluorescein contrast agent, we have reported the development of confocal arthroscopy for optical histological assessment without biopsy. The confocal arthroscopic technique was able to demonstrate rotator cuff tendinopathy in human cadavers, which appeared macroscopically normal under video arthroscopic examinations. The tendinopathy status of the rotator cuff tendons was confirmed by corresponding traditional histology. The development of confocal arthroscopy may provide a minimally invasive imaging technique for real‐time histology of rotator cuff without the need for tissue biopsy. This technique has the potential for surgeons to gain in real time the histological information of rotator cuff tendons, which may assist planning repair strategies and potentially improve intervention outcomes.