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为研究并网双馈风力发电系统故障实时运行特性,根据双馈风力发电机并网动态数学模型,在实时数字仿真平台(real time data simulator,RTDS)上搭建基于小步长元件的2 MW双馈式风力发电系统的仿真模型,其“背靠背”变流器采用经典的矢量控制策略。在风力发电系统并网母线故障情况下,分别对风机机械功率与发电机电磁功率的运行特性和背靠背变流器两侧功率及电压等变化情况进行仿真研究。仿真结果表明,故障时基于小步长算法的双馈风力发电系统具有良好的动态性能,同时验证所采用控制策略的有效性。 相似文献
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某燃油锅炉机组由于当地电网网频不稳定,机组试运过程中多次出现汽轮机OPC动作锅炉MFT,MFT后炉膛产生较大负压存在“内爆”风险。为避免锅炉炉膛“内爆”同时避免引风机跳闸导致动叶漂移甚至断裂,对锅炉MFT后送引风机控制进行了优化,避免了OPC动作锅炉MFT后锅炉“内爆”风险及引风机跳闸问题。 相似文献
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文中以百万千瓦机组汽轮机驱动式引风机为研究对象,采用等效焓降法定量计算和分析了引风机在电动和汽动方式下运行的经济性,计算分析结果表明,采用汽轮机驱动引风机运行相对于采用电动方式驱动引风机节能效果显著,运行更加经济,在低负荷下其煤电综合收益达到356元/h,该节能分析方法可为同类型机组引风机的节能改造提供借鉴作用。 相似文献
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RB是辅机故障减负荷(RUNBACK)的简称。如果火力发电机组在正常运行过程中出现锅炉侧或汽轮机侧重要辅机跳闸的工况,为防止事故进一步扩大,机组负荷指令将会按照预先设定的速率快速下降,在保证机组不灭火甚至跳闸的前提下,降至剩余运行辅机所能允许的负荷水平为止。为此,大型机组自动控制中设计了此功能,一旦发生机组某一重要辅机故障,机组则自动快速减负荷至实际工况所能达到的最大负荷值上稳定运行。 相似文献
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采用“二拖一”运行方式的联合循环机组,当一台余热锅炉出现故障而跳炉时,如不及时处理会引起汽轮机误跳,进而使另一台余热锅炉跳炉。这几年,镇海联合循环机组此类事故频发,影响了机组的稳定运行。本文介绍该厂针对此类汽轮机误跳现象,在确保主设备安全的前提下,对锅炉部分保护逻辑进行了修改,以减少汽轮机误跳几率,确保汽轮机稳定运行。 相似文献
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为了降低锅炉排烟温度,回收锅炉尾部烟气热量,提高机组效率,降低机组发电煤耗,确保电除尘、引风机安全运行,采用复合相变换热器加热同机组的凝结水,在避免换热器结露积灰的前提下,能大幅度降低锅炉排烟温度,回收锅炉尾部烟气的余热,减少汽轮机的抽汽量,增加机组发电能力,可获得较好的经济效益。 相似文献
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Supplementary firing is adopted in combined‐cycle power plants to reheat low‐temperature gas turbine exhaust before entering into the heat recovery steam generator. In an effort to identify suitable supplementary firing options in an integrated gasification combined‐cycle (IGCC) power plant configuration, so as to use coal effectively, the performance is compared for three different supplementary firing options. The comparison identifies the better of the supplementary firing options based on higher efficiency and work output per unit mass of coal and lower CO2 emissions. The three supplementary firing options with the corresponding fuel used for the supplementary firing are: (i) partial gasification with char, (ii) full gasification with coal and (iii) full gasification with syngas. The performance of the IGCC system with these three options is compared with an option of the IGCC system without supplementary firing. Each supplementary firing option also involves pre‐heating of the air entering the gas turbine combustion chamber in the gas cycle and reheating of the low‐pressure steam in the steam cycle. The effects on coal consumption and CO2 emissions are analysed by varying the operating conditions such as pressure ratio, gas turbine inlet temperature, air pre‐heat and supplementary firing temperature. The results indicate that more work output is produced per unit mass of coal when there is no supplementary firing. Among the supplementary firing options, the full gasification with syngas option produces the highest work output per unit mass of coal, and the partial gasification with char option emits the lowest amount of CO2 per unit mass of coal. Based on the analysis, the most advantageous option for low specific coal consumption and CO2 emissions is the supplementary firing case having full gasification with syngas as the fuel. Copyright © 2008 John Wiley & Sons, Ltd. 相似文献
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针对回热式给水泵汽轮机系统中的功率协调问题,分析了进汽节流调节、排汽补汽调节和发电机调节3种配置方案的控制方法与特点。以1000MW超超临界二次再热机组为研究对象,建立机组全范围仿真模型,研究了上述3种方案的热力性能差异。结果表明:随机组负荷的增加,小汽轮机与给水泵的功率差值先增大后减小,在70%THA工况附近达到最大值19.3MW;进汽节流调节方案节流损失较大,经济性最差;排汽补汽调节方案可减少进汽节流,提高给水温度,但增加了抽汽过热度,经济性优于节流调节;发电机调节方案经济性最佳,在低负荷下节能效果更加显著。 相似文献
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本文着重讨论了小型凝汽式汽轮发电机组低真空供热的几个问题。实践证明,利用小型发电厂低真空供热运行方式采暖,是一个节约用水、节约用电、节约用煤的节能环保新举措,具有很高的经济效益和环境效益。 相似文献
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Coal-fired generation units in China often operate under off-design loads. The off-design performance has important influence on operation energy consumption of generation units. An all-condition model is of critical importance for studying the off-design performance. In this paper, an all-condition simulation model of the steam turbine system for a 600 MW generation unit is built. Based on the actual system composition, the steam turbine system is divided into several sub equipment. A sub model is established for each device. In the turbine model, a parameter M is defined as the intermediate variable to calculate the extraction pressure of turbine. The operating data from a 600 MW generation unit are used to verify the all-condition model. The heater fouling conditions are also calculated. The result shows that the model successfully predicts the operation parameters under different loads and forecasts the thermal performance of typical equipment failure. 相似文献