计及燃气-蒸汽联合循环机组的热电联合调度模型

为了解决北方城市冬季供暖期的空气污染问题,我国正积极发展"煤改气"技术,将传统的燃煤热电机组改为燃气热电机组。建立了燃气-蒸汽联合循环机组的数学模型,并以系统成本最低为目标函数,构建了包含燃气-蒸汽联合循环机组的热电联合系统调度模型。分析了燃气-蒸汽联合循环机组替换传统热电机组后,燃气-蒸汽联合循环机组比例变化、风电渗透率不同对电网弃风率的影响。算例分析表明,燃气-蒸汽联合循环机组替换常规热电机组虽然增加了运行成本,但有利于电网消纳弃风。     

燃气-蒸汽联合循环机组的轴系配置分析

介绍了燃气-蒸汽联合循环轴系单轴和多轴配置方案及其优点,并对E级燃气-蒸汽联合循环各种轴系配置进行了技术经济比较,分析了单轴和多轴"1+1"布置两种方案特点,提出适合E级热电联产机组的轴系配置建议。     

基于变背压改造的燃气-蒸汽联合循环变工况性能优化

为了优化燃气-蒸汽联合循环变工况性能,本文对常规燃气-蒸汽联合循环系统进行改造,提出了一种变背压改造方法。改造系统在常规联合循环机组的余热锅炉尾部烟道布置引风机,以此降低机组部分工况下的燃气透平背压。以S109FA燃气-蒸汽联合循环作为参比机组,通过对参比机组和改造机组建模,采用等透平入口温度+燃料调节运行策略,分析并比较了二者的变工况性能。结果表明:与参比机组相比较,改造机组部分负荷下的顶、底循环效率均有所提高,联合循环负荷在84%~35%时,顶循环效率提高0~2.7百分点,底循环效率提高0~3.0百分点,联合循环的效率也相应提高,增幅为0~2.5百分点。变背压改造系统可以充分利用IGV流量调节,并提高相应流量下的燃气初参数,为燃气-蒸汽联合循环电站高效改造及运行提供了技术借鉴。     

燃气-蒸汽联合循环机组灵活性供热控制策略

燃气-蒸汽联合循环热电机组在冬季气源紧张情况下会出现机组供热出力不足,严重影响供暖质量。为此,本文对燃气-蒸汽联合循环机组进行节气保供热灵活性供热技术研究,设计了适应不同天然气量和供热负荷的6种供热模式,分别为高背压供热模式、抽汽高背压供热模式、低压缸空载供热模式、单台余热锅炉耦合高背压供热模式、单台余热锅炉耦合空载供热模式和2台余热锅炉供热模式。同时研发了全供热工况控制策略,主要包括供热模式切换控制策略及供热在线优化策略。对山西某燃气-蒸汽联合循环机组进行6种供热模式控制策略工程试验,结果表明,该灵活性供热控制策略能够实时准确地根据系统状态自动选择模式切换或运行参数优化,使供热负荷与供热需求间误差不超过1%。某860 MW燃气-蒸汽联合热电机组在300万m3/d的定气量条件下,每日最高可供热量5.2万GJ,热调峰能力提高约45%,机组灵活供热调峰能力明显提高。     

国外科技信息

世界最大的燃气蒸汽联合循环电站—日本富津火力发电厂世界最大的利用液化天然气发电的燃气蒸汽联合循环电站—富津火力发电厂,自1980年12月开始筹备,全厂装机容量2000MW(厂内安装从美国进口的14台165MW 发电机组,实际总容量为2310MW)。该工程分为两个系列,每个系列为7台机组。到1989年2月全部竣工。燃气蒸汽联合循环机组综合出力每台为165MW,其中燃气出力约占总出力的2/3,蒸汽机出力约占1/3。燃气轮机第一级动叶入口温度为1085℃,     

国内外发电厂"以大代小"模式及节能效果

我国内陆地区以开发高参数大容量蒸汽机组为主,同时在沿海地区适当开发发大中容量洁净煤燃气蒸汽联合循环机组为辅的“以大代小”模式取代中低压燃煤机组;国外为中以燃用天然气的燃气蒸汽联合循环发电的“以大代小”模式,两者都需要新技术达到节能目标。     

半山天然气发电厂主机选型及系统配置

浙江半山天然气发电厂采用 3套 30 0MW级燃气 -蒸汽联合循环发电机组 ,每套机组有燃气轮机、余热锅炉、汽轮机及发电机 4大主要部件。由于天然气价格较高 ,该厂应采用F级机组。从电厂容量的适应性、主厂房布置和总平面布置的可行性、启动和控制性能、投资成本比较、联合循环整体性能的比较、国产化实施潜力及维修费用、施工的便利性等方面确定了该厂宜采用F级、单轴燃气 -蒸汽联合循环机组。     

三菱M701F4联合循环机组天然气调压站优化设计

大唐绍兴江滨天然气-热电联产工程采用国内首套三菱M701F4型单轴燃气-蒸汽联合循环机组,为目前国内单机容量最大、热效率最高的9F级联合循环机组之一。针对该机型调压站系统进行了优化设计,同时设计了天然气泄漏监测装置,以提高发电厂经济效益,增加机组运行的可靠性,对于国内同类型项目具有借鉴和指导意义。     

燃气-蒸汽联合循环发电机组轴系配置的思考

燃气-蒸汽联合循环发电机组因高效、节能、环保而越来越受到重视,为此,从我国当前大力发展燃气-蒸汽联合循环发电机组的实际情况出发,全面分析联合循环机组轴系的配置型式及其影响,重点比较了单轴和多轴“2拖1”机组在设备投资、占地面积、建设周期、起动停机、功率和效率、检修和控制系统方面的优缺点,为燃气-蒸汽联合循环发电新机组建设的轴系配置提供参考。     

电力建设大事录

20 0 3年 9月 2 8日总投资 2 5亿元的“西气东输”配套工程———华兴电力项目在张家港动工兴建。该项目建成后将成为国内最大的燃气 -蒸汽联合循环发电厂。该项目计划建设 2套 395MW级燃气 -蒸汽联合循环发电机组 ,这是国内 10个燃机项目中第 1个获批准项目。该设备以天然气作为发电燃料 ,年耗气量约 7亿m3,预计 2 0 0 5年 8月 1号机组投入运行 ,2 0 0 6年2月 2号机组投入运行。2 0 0 3年 10月 12日随着最后一相导线跨越长江天堑放线成功 ,三广直流输电线路全线架通。三峡至广东± 5 0 0kV直流输电线路工程北起湖北荆州换流站 ,途经湖北…     

应用模拟法进行发输电组合系统可靠性评估的研究

电力系统可靠性评估的方法可分为两大类解析法和模拟法。通过对发、输电组合系统可靠性的研究,建立了其评估模型,包括系统停运模型、负荷模型、运行调整策略模型、可靠性指标计算模型。并应用离散事件系统模拟法评估发输电组合系统的可靠性,给出了发输电组合系统可靠性评估模型流程图。     

含风电场的发输电组合系统可靠性评估

为评价风电并网对系统可靠性的影响,考虑了风速的时序性和自相关性,建立了风速的自回归移动平均模型,采用东台风电场实际监测的风速历史数据,并结合机组、线路和变压器等状态模型,建立了基于序贯MonteCarlo仿真方法的风电场发输电可靠性模型,对含风电场的发输电组合系统进行可靠性评估,同时采用了最优切负荷的方法,尽量减小切负荷量,并给出了具体的算法流程。算例采用IEEE-RTS测试系统,利用可靠性指标缺负荷概率LOLP、电量不足期望EENS和电力不足期望LOLE等反映风电并网对系统可靠性的影响。通过对仿真结果的比较和分析,可看出风电机组的接入对提高发输电组合系统的可靠性具有一定的积极作用。     

Experiences in modelling the performance of generating plant for frequency response studies on the British transmission grid

Significant changes to the generation mix on the British transmission system have occurred in the past 10 years, and this trend is expected to continue in the future with an increase in renewable generation. This change, in conjunction with market changes, has driven the need to establish suitable generator models for thermal plant used in dynamic response studies. These studies are presently used to quantify the dynamic requirement that secures the transmission system against large instantaneous losses of power. This paper provides an account of the experiences gained in modelling the performance of generators based in Great Britain. Established governor models to represent the behaviour of traditional coal and oil fired plant already exist and comments are made on their performance against system incidents. Models of combined cycle units using traditional open cycle gas turbine models have shown poor correspondence with monitored grid data in simulations. A gas and steam turbine governor model to represent combined cycle plant was developed, and is presented, with results from validation trials against recorded test data. Improvements in simulating grid frequency have been demonstrated using the developed models in a full network simulation of a recent generator loss event.     

Distributed generation

The emphasis of this article is on distributed generators that are interconnected to with utility distribution systems. These will generally be units smaller than 10 MW. Larger units are generally connected directly to transmission facilities and will most likely be commercial power producers. The units installed on distribution systems will typically be no larger than 1 or 2 MW. These would be installed mostly by the utility itself or by end users. This method of generation is commonly referred to as "distributed generation" (DG)     

计及风电场的发输配电系统可靠性评估

考虑风速时序性和自相关性的特点,建立了风速的自回归移动平均(auto-regressive and moving average,ARMA)模型,并结合常规机组、线路和变压器等状态模型,建立了基于蒙特卡罗仿真方法的风电场可靠性模型,对含风电场的发输电组合系统进行可靠性评估,同时建立了发输电组合系统的多状态机组等值模型,将该等值模型与配电系统相结合,计算了平均停电频率和停电电量损失等配电网可靠性指标,通过分析和比较可靠性指标研究了风电场对配电系统可靠性的影响,结果表明风电机组的接入对提高电力系统可靠性具有一定的作用。     

发输电系统概率安全性评估基本框架的研究

发输电系统的概率安全性评估,是当前电力系统可靠性研究的学术问题前沿之一.文中提出了基于蒙特卡罗模拟法的发输电系统安全性评估的基本框架,并对安全性指标体系、基本评估算法等进行了详细论述.该框架借鉴了充裕度评估中比较成熟的技术,并将充裕度和安全性统一在同一个评估框架中.最后,对IEEE-RTS79进行了测试计算,验证了评估算法的有效性.     

大型风电场接入对交直流并行输电系统频率影响研究

针对风火打捆经交直流并行输电系统送出的情况,搭建了含交直流并行输电线路的四机两区模型以及大型风电场模型,将大型风电场加入到四机两区模型当中。通过仿真对用风电代替火电时系统受到扰动时频率变化进行对比,得出风电机组的接入会使得系统的频率特性变差。并在系统中加入同时考虑交流线路和直流线路传输功率变化的自动发电控制(AGC),仿真结果表明,所设计的AGC能够有效的改善系统的频率特性,提高系统的稳定性。     

A graph trace based reliability analysis of electric power systems with time-varying loads and dependent failures

A new approach to the prediction of the reliability of electrical systems is presented. In this approach a graph trace based reliability analysis of electric transmission and/or distribution systems is used. The systems are modeled using containers with iterators, where the iterators manage graph edges and are used to process through the topology of the graph. The analysis provides a means of computationally handling dependent failure rates and cascading failures. The effects of weather, time-varying loads, equipment age, wetness, and dependent failures associated with repaired components are considered. A sequential Monte Carlo simulation is used to evaluate the reliability changes for different system configurations, including distributed generation and transmission lines. Historical weather records and loading are used to update the component failure rates on-the-fly. Simulation results are compared against historical reliability field measurements.     

CY7C924在光纤通信中的应用

在当前的许多电子系统中,越来越多的数据传输应用中倾向于使用光纤通信技术。CY7C924作为一款高集成度、强灵活性、高可靠度的物理层通信接口芯片,可以方便的应用于光纤通信系统中。本文介绍了CY7C924的功能特性,描述了利用CY7C924分别结合现场可编程门阵列和单片机作为系统主机的光线通信系统应用,并给出了系统仿真结果。采用CY7C924的光纤通信方案预期可缩短系统开发周期。     

Reliability assessment of restructured power systems using reliability network equivalent and pseudo-sequential simulation techniques

This paper presents a technique to evaluate reliability of a restructured power system with a bilateral market. The proposed technique is based on the combination of the reliability network equivalent and pseudo-sequential simulation approaches. The reliability network equivalent techniques have been implemented in the Monte Carlo simulation procedure to reduce the computational burden of the analysis. Pseudo-sequential simulation has been used to increase the computational efficiency of the non-sequential simulation method and to model the chronological aspects of market trading and system operation. Multi-state Markov models for generation and transmission systems are proposed and implemented in the simulation. A new load shedding scheme is proposed during generation inadequacy and network congestion to minimize the load curtailment. The IEEE reliability test system (RTS) is used to illustrate the technique.