QD128燃气轮机发电机组在超大型IDC／EDC机房的应用

简要介绍了QD30C和QD128燃气轮机发电机组的构成和主要技术参数,初步探讨了QD30C和QD128燃气轮机发电机组在超大型IDC／EDC机房的配置。提出了QD128燃气轮机发电机组在超大型IDC／EDC机房应用的建议。     

QD128燃气轮机发电机组的创新性应用及其影响初探

简要介绍具有自主知识产权的QD128燃气轮机发电机组的构成、主要技术参数和主要特点。结合工程建设情况,分析QD128燃气轮机发电机组降低工程造价、运行成本的优势和特有的连续运行时间长、过负荷能力强,节能等技术创新以及QD128燃气轮机发电机组作为通信用备用发电机组可能对目前大功率备用发电机组的市场格局和运行维护模式带来的影响。     

QD10B型车载式移动燃气轮机发电机组简介

介绍了国内首台自行研制的1000kW QD10B型车载式移动燃气轮机发电机组的总体性能及控制方式。     

通信用1600kW燃气轮发电机组应用试验

结合广东省电信分公司的应用实际,将通信用1600kW燃气轮发电机组与柴油发电机组进行了比较,给出了这种新型燃气轮机的主要技术指标,找出了燃气轮机的不足,并提出了今后的改进意见。     

通信局（站）交流备用电源浅议

简介了通信局（站）对柴油发电机组的主要技术要求,燃气轮机的优缺点,备用发电机组的选用;最后对机组选用提出了建议。     

我国通信用燃气轮机发电机组的应用和发展

简要介绍通信用燃气轮机发电机组的工作原理、构造、特性和应用，提出设计安装、维护和制造中的问题、建议和探讨。     

燃气轮机发电机组在通信局（站）中的应用

简介了燃气轮机发电机组的性能特点;国内外发展情况;在通信领域的应用前景。     

新建移动通信综合楼备用发电机组的选择

本文通过对柴油发电机组和燃气轮机发电机组在技术性能、投资费用、耗油成本、运行维护及30年综合投资等几个方面全面比较和较为深入的分析,使用户对两种备用电源有较为直观和清晰的认识,阐明了两种发电机组的优缺点,为用户及设计选型提供了理论依据和有益的设计参考。     

高压发电机组在通信电源中的应用与发展

通过对高、低压发电机组在技术性能、经济成本等方面的比较,说明了高压发电机组作为通信电源备用电源的优势和发展前景,并给出了10 kV高压发电机组在通信电源中的具体应用。     

通信机房采用室外集装箱发电机组的分析

介绍了室外集装箱发电机组的市场应用状况,以及采用室外集装箱发电机组需要注意的问题,对室外集装箱发电机组与室内发电机组的技术性和经济性进行了对比分析,最后提出了通信局房采用室外集装箱发电机组的建议。     

Longitudinal spatial hole burning in a quantum-dot laser

Detailed theoretical analysis of longitudinal spatial hole burning in quantum-dot (QD) lasers is given. Unlike conventional semiconductor lasers, escape of thermally excited carriers from QDs, rather than diffusion, is shown to control the smoothing-out of the spatially nonuniform population inversion and multimode generation in QD lasers. The multimode generation threshold is calculated as a function of structure parameters (surface density of QDs, QD size dispersion, and cavity length) and temperature. A decrease in the QD size dispersion is shown to increase considerably the relative multimode generation threshold. The maximum tolerable QD size dispersion and the minimum tolerable cavity length, at which lasing is possible to attain, are shown to exist. Concurrent with the increase of threshold current, an increase of the multimode generation threshold is shown to occur with a rise in temperature. Ways to optimize the QD laser, aimed at maximizing the multimode generation threshold, are outlined     

Position sensorless starting of super high-speed PM Generator for micro gas turbine

Position sensorless speed control of super high-speed permanent magnet (PM) motor for micro gas turbine generation system is described. Mechanically robust surface PM (SPM) generator is installed in a turbine system. This generator is used as the starting motor. The sensorless control of the synchronous generator/motor is done by using voltage/frequency (V/F) control strategy without current loop. After the simulation of the proposed strategy, no-load starting test of the generator and actual starting test of the gas-turbine system are done. The proposed sensorless-control system can start and control the PM motor from zero to 30 000 r/min. The results show that the proposed system is robust for accelerating the generator even in the existence of the disturbance caused by the ignition of the turbine.     

V参数SVM在烟气轮机故障诊断中的应用

烟气轮机机组是利用余热发电的原理回收高温热能再生电能,但是由于多方面的原因,烟气轮机机组时常发生故障,对生产的经济性和安全性造成巨大损失。为了保障设备正常运行,对设备进行实时监测,及时判断故障发生的可疑点,减少故障发生的频率,同时保护环境,采用对原始信号的3层小波分解,提取信号的特征向量,再采用C-SVC和V参数支持向量机二种方法进行分类实验,得到V参数的支持向量机分类效果最佳。     

分布式能源系统中燃气轮机热电联产运行方式优化方法

为了对热电联产之中电负荷与热负荷变化进行协调,需对热电供需的不均衡问题进行处理,优化分布式能源的系统之中燃气轮机的热电联产运行方式.同时在传统以热定电与以电定热运行基础上,添加辅助的设备方式,对热电联产运行方式进行补充.本文主要分析了燃气轮机的热电联产两类运行方式,深入研究优化分布式能源的系统之中燃气轮机的热电联产运行方式,为相关研究提供参考.     

Lighter fuel-the gas turbine comes of age

Some profound changes are overcoming the technology of electricity generation. A combination of environmental, economic and technical factors is increasingly leading generators to favour the adoption of gas-turbine-based plant. The author discusses the reasons for the increased use of gas turbines and discusses their operating principles. The use of turbine exhaust gases for steam generation of direct heating (cogeneration plants) is also discussed as is the application of gas turbines to base load and gasification plants. Future prospects are mentioned     

Long-wavelength InP-based quantum-dash lasers

Self-assembled InAs quantum-dash (QD) lasers with emission wavelengths between 1.54 and 1.78 μm based on the AlGaInAs-AlInAs-InP material system were grown by gas source molecular beam epitaxy. Threshold current densities below 1 kA/cm² were achieved for 1-mm-long mirror coated broad area lasers with a stack of four QD layers. The devices can be operated up to 80°C in pulsed mode and show a high T₀ value of 84 K up to 35°C. In comparison to quantum-well lasers a much lower temperature sensitivity of the emission wavelength was achieved. The temperature shift of Δλ/ΔT = 0.12 nm/K is as low as that caused by the refractive index change     

Origins of Low Quantum Efficiencies in Quantum Dot LEDs

The promise for next generation light‐emitting device (LED) technologies is a major driver for research on nanocrystal quantum dots (QDs). The low efficiencies of current QD‐LEDs are often attributed to luminescence quenching of charged QDs through Auger‐processes. Although new QD chemistries successfully suppress Auger recombination, high performance QD‐LEDs with these materials have yet to be demonstrated. Here, QD‐LED performance is shown to be significantly limited by the electric field. Experimental field‐dependent photoluminescence decay studies and tight‐binding simulations are used to show that independent of charging, the electric field can strongly quench the luminescence of QD solids by reducing the electron and hole wavefunction overlap, thereby lowering the radiative recombination rate. Quantifying this effect for a series of CdSe/CdS QD solids reveals a strong dependence on the QD band structure, which enables the outline of clear design strategies for QD materials and device architectures to improve QD‐LED performance.     

Dynamic system identification and model-based fault diagnosis of an industrial gas turbine prototype

In this paper, a model-based procedure exploiting analytical redundancy for the detection and isolation of faults on a gas turbine process is presented. The main point of the present work consists of exploiting system identification schemes in connection with observer and filter design procedures for diagnostic purpose. Linear model identification (black-box modelling) and output estimation (dynamic observers and Kalman filters) integrated approaches to fault diagnosis are in particular advantageous in terms of solution complexity and performance. This scheme is especially useful when robust solutions are considered for minimise the effects of modelling errors and noise, while maximising fault sensitivity. A model of the process under investigation is obtained by identification procedures, whilst the residual generation task is achieved by means of output observers and Kalman filters designed in both noise-free and noisy assumptions. The proposed tools have been tested on a single-shaft industrial gas turbine prototype model and they have been evaluated using non-linear simulations, based on the gas turbine data.