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发电机故障停运是电力系统运行中的不确定事件。目前在含风电鲁棒机组组合中考虑机组故障停运的方法,不同程度地忽略了机组故障停运的概率特征,难以较好描述机组故障停运风险。在含风电鲁棒机组组合模型的基础上,引入电量不足期望以量化机组故障停运风险,基于成本收益分析建立了考虑风电不确定性和机组故障停运风险的两阶段鲁棒机组组合模型,并提出计算电量不足期望的简化模型以提升计算效率。基于改进的IEEE-RTS 26机系统验证所提模型和方法,结果表明该方法能较好考虑风电不确定性和机组故障停运风险的影响,该简化模型能显著减小问题求解规模、缩短计算时间。 相似文献
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随着风电机组大规模并网,风电对电力系统的影响逐渐显现。我国多次发生风电机组连锁脱网事故,影响了电力系统的运行。为了预警风电机组脱网,保证电力系统的安全运行,提出风电机组脱网的风险评估模型。由于故障组合数量爆炸,不可能在线分析所有的可能故障。因此,建立风电机组脱网指标,来衡量发生故障时风电机组的脱网概率。该指标不但考虑电力系统故障,同时也考虑了风电场内部故障。根据脱网指标和风电场到故障点的电气距离,对预想故障进行排序和筛选,生成有效预想故障子集;仅对有效故障集内的可能故障进行在线风险评估和风电机组脱网预警。该模型可以给出风电机组脱网容量。对某省电网在线数据仿真分析,验证了理论方法的正确性和预警模型有效性。 相似文献
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根据多年的检修实践经验,对抽水蓄能机组的故障查找与分析进行了总结。简述了抽水蓄能机组的特点并按故障时的机组状态对故障形式进行了分类,介绍了故障查找的一般步骤及其方法,并对故障查找的实践经验进行了总结。 相似文献
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维护水平是影响风电机组维护成本的重要因素之一。故障模式、影响及危害性分析根据危害度对故障模式进行分级,找出危害度较高的故障模式并给予较多的维护资源,有助于提升风电机组的维护水平。然而,在目前的风电机组FMECA中,监测控制与数据采集系统的存在、处理故障的过程以及故障发生及其影响的真实情况等特征未被充分利用。文中结合传统FMECA与以上特征,提出了一种面向风电机组维护的改进FMECA。为更接近故障处理过程,将风电机组分为机组层,SCADA层及部件层。分别将SCADA系统的报警内容、部件的故障模式及机组停机视为SCADA层的故障模式、原因及对高层级的影响。同时,根据机组各故障的发生概率及影响的真实情况重新定义其等级。最后给出了改进FMECA在某型号风电机组中的应用实例。 相似文献
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1 前言 为提高机组的故障监视水准,加强事故现场记录,以便更迅速地排除机组的故障及故障的潜在因素,为区别各种人为故障因素和非人为故障因素提供客观依据,目前,一般机组均采用事故记录仪进行事故动作记录,以提高机组安全运行水平。韶关电厂#3、#4、#5、#6等4台5万千瓦机组以及#8机组所采用事故记录仪均系天津宝坻海河 相似文献
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海上风电场可及性差,运行条件恶劣。风电机组故障率高,故障修复时间长且维护困难,一旦故障停运,经济损失巨大。统计并对比分析海上风电机组和陆上风电机组的历史运行数据,归纳海上风电机组关键部件的故障特点,分析风力发电机组常见的电气类故障及其对系统的影响。分别从软件容错、硬件容错两个方面总结现有海上风电机组容错运行的研究现状,归纳目前海上风电机组的容错方案,分析现有容错方案的应用可行性。进一步指出现阶段海上风电机组故障容错存在的主要问题,并对将来的研究热点进行了展望。 相似文献
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针对田湾核电站机组功率运行期间堆外核测系统因故障而出现核功率突变的现象,通过对故障现象、信号处理原理、设备功能等的分析,总结归纳了较优的故障处理方法,便于维护人员能快速、有效地处理故障,降低故障处理对机组带来的停堆风险,保障机组安全稳定运行. 相似文献
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直接空冷机组的阻塞背压特性与湿冷机组存在较大的差别,探讨直接空冷机组阻塞背压随负荷的变化规律.以一超临界、次中间再热、单轴、二缸二排汽、直接空冷凝汽式汽轮机为例,给出了计算结果,并与湿冷机组作了比较. 相似文献
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600 MW机组无电泵启动方式探讨 总被引:2,自引:0,他引:2
嘉兴电厂6号600 MW机组调试阶段,因电动给水泵增压级故障,导致机组不能正常启动,采用辅汽冲转1台小汽机驱动汽泵实现机组的冷态启动。机组冲转前,用汽泵前置泵给锅炉上水后,锅炉点火。辅汽冲动1台小汽机,并用汽泵继续给锅炉补水。当达一定负荷后,用四段抽汽启动另一台小汽机,冷再汽源备用。实际运行情况表明:6号机组因电泵故障而被迫采用无电泵冷态启动是成功的。 相似文献
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Juho Kim Leejun Kim Donggeun Jung Young Sung Kim Jaichan Lee 《Integrated ferroelectrics》2013,141(1):235-242
BaTiO 3 /SrTiO 3 artificial lattices were deposited on (La,Sr)CoO 3 coated MgO(100) single crystal substrate by pulsed laser deposition (PLD). The stacking thickness ratio of consisting BTO and STO layers was varied while one of the consisting layers was maintained at 2 unit cell layer thickness. The stacking periodicity of BTO/STO artificial lattice was, therefore in the range from asymmetric BTO 2 unit cell /STO 32 unit cell to BTO 32 unit cell /STO 2 unit cell structure with a total thickness of 100 nm. As the stacking thickness of the BTO layer increased with a fixed stacking thickness of the STO layer (i.e., 2 unit cell thickness), the lattice distortion of the STO layer increased due to mechanical constraint from the thick BTO layer while the lattice distortion of the BTO layer was relatively unchanged. The lattice distortion (c/a) of the STO layer reached at 1.10 for the stacking periodicity of BTO 32 unit cell /STO 2 unit cell . The multiplayer structure with variable stacking thickness of the STO layer and fixed stacking thickness of the BTO layer exhibited the large variation in the lattice distortion of the BTO layer. The dielectric constant of the BTO/STO artificial lattice decreased with the stacking thickness ratio of the BTO and STO layers. This was attributed to severe lattice distortion of the STO (or BTO) in the multiplayer structure of variable stacking thickness of the BTO (or STO) layer. The dielectric constant of the BTO/STO artificial lattice reached a maximum i.e., 1230 at a stacking periodicity of BTO 2 unit cell /STO 2 unit cell. 相似文献
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微电网的协调控制方法是微电网最为关键的技术之一,主从控制方法是微电网协调控制中的常用方法。针对传统的主从控制存在的问题,提出了一种带辅助微源的新型主从控制策略。在传统主从控制基础上,增设一个采用下垂控制的辅助控制单元,此辅助单元可与主控单元一起共同支撑微电网的电压与频率稳定,且当主控单元出现故障时可替补充当新的主控单元,克服了传统主从控制采用单一主控单元发生故障时微电网崩溃的危险,从而增强了主从控制方式的稳定性。MATLAB/Simulink软件仿真验证了所提控制策略的有效性和可行性。 相似文献
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BaTiO 3 /SrTiO 3 artificial lattices were deposited on (La,Sr)CoO 3 coated MgO(100) single crystal substrate by pulsed laser deposition (PLD). The stacking thickness ratio of consisting BTO and STO layers was varied while one of the both consisting layers was maintained at 2 unit cell layer thickness. The stacking periodicity of BTO/STO artificial lattice was, therefore in the range from asymmetric BTO 2 unit cell /STO 32 unit cell to BTO 32 unit cell /STO 2 unit cell structure with a total thickness of 100 nm. As the stacking thickness of the BTO layer increased with a fixed stacking thickness of the STO layer (i.e., 2 unit cell thickness), the lattice distortion of the STO layer increased due to mechanical constraint from the thick BTO layer while the lattice distortion of the BTO layer was relatively unchanged. The lattice distortion (c/a) of the STO layer reached at 1.10 for the stacking periodicity of BTO 32 unit cell /STO 2 unit cell . The multiplayer structure with variable stacking thickness of the STO layer and fixed stacking thickness of the BTO layer exhibited the large variation in the lattice distortion of the BTO layer. The dielectric constant of the BTO/STO artificial lattice decreased with the stacking thickness ratio of the BTO and STO layers. This was attributed to severe lattice distortion of the STO (or BTO) in the multiplayer structure of variable stacking thickness of the BTO (or STO) layer. The dielectric constant of the BTO/STO artificial lattice reached a maximum i.e., 1230 at a stacking periodicity of BTO 2 unit cell /STO 2 unit cell. 相似文献
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We describe the outcomes from the development of a gas-turbine topping for the 300-MW power unit that was initially constructed
as an attachment to an MHD-generator, which, however, has not been constructed. A 110-MW GTE-110 gas-turbine unit was used
as a topping for this power unit. The topped power unit allows more than 9% of fuel to be saved as compared with the original
one. 相似文献