大型汽轮发电机组变负荷工况经济性分析

针对大型汽轮发电机组变负荷工况经济性的变化问题,从汽轮发电机组蒸汽动力循环的基本公式以及基本原理出发,对影响机组变负荷经济性的各个因素进行了详细的论述和分析。指出了影响机组变负荷经济性的主要因素及其变化趋势,并对不同类型机组的变负荷性能提出了相应的估计值。研究结果能为大型汽轮发电机组变负荷工况经济性指标的评价提供参考。     

增加一级回热抽汽对低负荷下汽轮发电机组热耗率的影响分析

随着可再生能源发电并网,对大型火电机组负荷率降低,机组经济性降低。以某600MW机组为研究对象,定量分析了增加一级回热抽汽对低负荷下汽轮发电机组热耗率的影响。研究表明,无论新增加热器抽汽位于现有压力最高加热器抽汽点前的高压缸哪一级,汽轮发电机组的热耗率均降低;汽轮发电机组低负荷运行时,在不同位置加一级抽汽对汽轮发电机组热耗率影响程度不同,综合考虑,汽轮发电机组在100%~50%负荷运行时,新增回热抽汽应位于高压缸第2压力级级前,此时汽轮发电机组经济性最高。此项研究可为汽轮发电机组低负荷下提高运行经济性提供理论指导。     

参数和系统对汽轮发电机组运行经济性的影响

从汽轮发电机组实际运行角度，分析了运行中参数和系统与设计值的偏差对机组热经济性的影响，并计算了这类偏差对目前国内３００ＭＷ发电机组热经济性的影响。     

60 MW汽轮发电机组热经济性分析

汽轮发电机组是热电厂的重要组成部分,对汽轮机通流部分的改造,能够有效地提升热电厂的热经济性。文中以CC60-8.83/4.31/1.47型汽轮发电机组为研究对象,对改造前后典型工况下的热耗率和相对内效率进行分析,汽轮机通流部分改造后机组的平均供电煤耗下降了14.8 g/k W·h,相对内效率提升3%~5%。同时结合实际运行状况,总结出影响汽轮发电机组热经济性的因素,为机组的经济性运行及调度提供依据。     

提高垃圾焚烧锅炉蒸汽参数的措施

垃圾焚烧发电机组提高蒸汽参数可以有效提高电厂发电效率。从材料、布置、防腐措施上进行了详细分析,提出垃圾焚烧发电机组提高蒸汽参数措施,提高电厂经济性。     

提高主蒸汽温度的途径

<正> 自国产锅炉机组向大容量、高参数发展以来,有相当数量的锅炉存在着主蒸汽温度偏低、达不到设计值的问题。主汽温度偏低,无疑会降低汽轮发电机组的安全性和经济性。以125MW发电机组为例,当其他蒸汽参数不变,主蒸汽温度偏离设计值时对经济性的影响见表1。     

汽轮机热耗在线分析及管理系统结构设计

对热耗进行在线监测和实时故障分析已成为当今先进汽轮发电机组发展的必然趋势之一。该文根据电厂不同的运动状况，提出了热耗在线分析和管理系统的结构设计，实践表明，所提出的设计思路能成功地对电厂机组经济性进行在线管理。采用该诃提高机组运行的可靠性，经济性，延长机组的运行寿命。     

某航改型燃气轮机发电机组应用于 通信电源系统可行性浅析

本文通过简要介绍某航改型燃气轮机发电机组的结构组成、主要性能指标及技术水平等现状,反映出该燃气轮机发电机组能够满足通信行业标准性能参数要求及通信设备应急供电需求。对比柴油机发电机组,分析了该燃气轮机发电机组在结构性能、经济性及应用前景等方面的优势,表明了某航改型燃气轮机发电机组应用于通信电源系统更加胜任,更加符合未来发展趋势。     

风力发电机组选型在风场建设中的重要性

风力发电机组选型在风场建设中起着至关重要的作用。风力发电机组选型一般由两部分组成,即单机机组容量的选择和机型的选择。论述了风力发电机组选型的基本原则,结合实际风场机组选型的案例,通过对机组选型的技术性、实用性和经济性的计算、比较和分析,揭示其在风场建设中的重要性。     

350MW超临界火电机组技术经济性分析

近年,350MW超临界火力发电机组技术发展迅速,在中国大陆地区已有约20多台机组投运或正在建设中。与同容量等级的亚临界火力发电机组相比,超临界火力发电机组热经济性较高,但电厂初投资高。因此,有必要对350MW超临界参数的火力发电机组的技术经济性加以分析。通过对比亚临界参数火力发电机组,比较其技术特点和投资回报。     

中国煤电机组设备状态评价及分析

分析了现役煤电机组综合升级改造后的能耗、环保和运行可靠性状况,基于此分析了制约煤电机组系统寿命的关键因素。通过典型机组案例计算,从度电经济成本和度电污染成本角度分析了新建机组和现役机组延续运行的经济性。综合得出,中国现役煤电机组有足够的能力和可靠性延续运行,且现役煤电机组延续运行的经济性优于新建机组。     

Availability growth models and verification of power equipment

The general availability growth models for large scale complicated repairable system such as electric generating units, power station auxiliaries, and transmission and distribution installations are presented. The calculation formulas for the maintenance coefficient, mathematical expressions for general availability growth models, ways for estimating, and fitting on checking the parameters of the model are introduced. Availability growth models for electric generating units, power station auxiliaries, and transmission and distribution installations are given together with verification examples for availability growth models of 320–1000 MW nuclear power units and 1000 MW thermal power units, 200–1000 MW power station auxiliaries, and 220–500 kV transmission and distribution installations. The verification results for operation availability data show that the maintenance coefficients for electric generating units, power station auxiliaries, transmission and distribution installations conform to the power function, and general availability growth models conform to rules of availability growth tendency of power equipment.     

提升西北电网水（火）电机组一次调频性能的措施

为了适应西北电网大规模外送的要求,提高西北电网频率稳定性,西北电力调度通信中心对于西北电网内水(火)电机组的一次调频性能提出了整改措施,该措施将机组一次调频贡献电量、响应行为等指标作为考评发电企业的考评标准,确定了水(火)电机组一次调频性能考评办法、计量计算方法、信息披露方法。实践表明,该整改措施提高了西北电力系统在直流闭锁、大容量机组跳闸时系统频率的稳定性。     

Optimal generation scheduling in power system using frequency prediction through ANN under ABT environment

In a competitive and deregulated power scenario, the utilities try to maintain their real electric power generation in balance with the load demand, which creates a need for the precise real time generation scheduling (GS). In this paper, the GS problem is solved to perform the unit commitment (UC) based on frequency prediction by using artificial neural network (ANN) with the objective to minimize the overall system cost of the state utility. The introduction of availability-based tariff (ABT) signifies the importance of frequency in GS. Under-prediction or over-prediction will result in an unnecessary commitment of generating units or buying power from central generating units at a higher cost. Therefore, an accurate frequency prediction is the first step toward optimal GS. The dependency of frequency on various parameters such as actual generation, load demand, wind power and power deficit has been considered in this paper. The proposed technique provides a reliable solution for the input parameter different from the one presented in the training data. The performance of the frequency predictor model has been evaluated based on the absolute percentage error (APE) and the mean absolute percentage error (MAPE). The proposed predicted frequency sensitive GS model is applied to the system of Indian state of Tamilnadu, which reduces the overall system cost of the state utility by keeping off the dearer units selected based on the predicted frequency.     

黑河流域梯级水电站群机组远程监控与故障诊断系统

为了确保水轮发电机组的安全稳定和经济运行,提出了基于Internet/Intranet开放式结构的水轮发电机组远程监测与故障诊断系统,并对系统的设计原则、网络化体系结构、机组测点布置、传感器选型及系统的功能做了详细的分析。该系统实现了水轮发电机组信号的数据采集、数据分析和处理,并能通过Internet/Intranet进行故障诊断。实际应用表明,该系统兼具技术的先进性和实用性,运行稳定可靠,具有良好的应用前景。     

改进的人工鱼群算法在电力系统经济负荷分配中的应用

经济负荷分配是提高电力系统经济运行、减少发电成本的关键问题,针对现行优化电力系统经济负荷分配方法存在的不足,在传统人工鱼群算法基础上,引入了动态变量(可变感知距离、变尺度移动步长和随机移动的概率)和t分布概率算子,提出了一种改进的人工鱼群算法对机组有功出力进行合理分配,并利用该方法对某地3机系统进行多时段仿真。结果表明,该算法不仅优化了多台机组负荷的最优分配,且能更快更准地获取全局最优解,具有较高的使用价值。     

基于Multi-Agent系统的机组调度研究

将Multi-Agent系统引入机组调度中,将每台机组视为一个Agent,共同组成一个Multi-Agent系统.通过Agent之间的通信和协作,实现机组的优化调度.在机组MAS中,通过合同网机制实现负荷分配和机组启停决策.与传统调度方法相比,基于Multi-Agent的机组调度可以充分发挥机组的自治性和机组之间的协调功能,提高系统的稳定性、可靠性、灵活性,缩短系统的响应时间.     

Impact of renewable generation unit on stability of power systems

Nowadays, the development of the electric power system is associated with the penetration of power generation units based on renewable energy sources and operated with energy storage systems. However, the operation of such generation units changes and complicates the processes in the electric power system, which determines the need for a number of studies and analyses. This paper presents the results of assessing the impact of the operation of photovoltaic plants on the static stability of the electric power system. To achieve the goal, the EUROSTAG software was used. The results of studies of normal and post-emergency modes of electric power system with the different penetration level of generation units are presented, power system stability coefficients of active power and voltage are determined, damping properties of electric power system based on the calculation of the transient damping coefficient of the damping process are estimated.     

李家峡水电站水轮发电机的进相运行

水轮发电机适时进相运行 ,能改善和抑制电网电压水平。本文对李家峡水电站 1 #水轮发电机的进相运行试验进行分析 ,旨在找出水轮发电机进相运行的限制条件 ,以便提高水轮发电机的进相能力     

Emission constrained unit-commitment (ECUC)

This paper presents a short-term unit commitment approach that incorporates environmental externalities into electric utility operations decision-making. The suggested approach identifies the least cost action for achieving daily or weekly emission targets. The problem formulation includes all standard system constraints, and explicitly addresses variable emission during start-up, operation, and shut-down of electric generating units. The problem is solved using a Lagrangian relaxation-based algorithm which offers a practical approach to the emission constrained unit commitment problem