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为有效衡量地区电网建设管理水平,差异化地对地区可靠性水平进行量化评价,提出了一种基于GRA-Kmeans++算法的配电网供电可靠性水平评价方法。首先,综合考虑外部因素与电网因素,构建地区配电网可靠性影响因素集。结合地区供电范围,基于灰色关联算法(grey relation analysis,GRA)分析可靠性影响因素与供电可靠性的关联度。然后,提出基于外部因素的地区加权聚类模型,选取外部因素的信息熵和关联度作为指标综合权重,结合带权重的K-means++算法对同等外部条件地区进行聚类,提出可靠性偏移度作为地区可靠性水平评价指标。随后结合电网因素的关联度评价指标,辨识影响地区可靠性偏低的关键因素,确定提升电网可靠性的建设管理方向。采用实际配电网数据进行算法验证,结果表明所提方法能够有效实现配电网可靠性水平评价,并为决策可靠性提升手段提供一定的理论依据。 相似文献
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为了提高能源利用效率与实现能源清洁供应,综合能源系统IES已成为支撑能源转型的重要技术。研究掌握IES多能流耦合机理,对开展后续系统规划、优化和分析问题的研究具有重要意义。本文提出了一种适用于含电、气、热网络的大规模综合能源系统电-气-热多能潮流计算方法。首先,建立了电力网络、热力网络、天然气网络的稳态数学模型;建立了基于通用能量母线模型的IES耦合环节数学表达形式;在此基础上,采用牛顿-拉夫逊方法对大规模综合能源系统多能潮流计算模型进行解耦求解;最后,通过算例分析验证了所提出方法的有效性。 相似文献
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生物油中乙酸和乙醇共裂化获取汽油产物的研究简 总被引:1,自引:0,他引:1
Abstract Acetic acid was selected as the model compound representing the carboxylic acids present in bio-oil. This work focuses the co-cracking of acetic acid with ethanol for bio-gasoline production. The influences of reaction temperature and pressure on the conversion of reactants as well as the selectivity and Conaposition of the crudegasoline phase were investigated. It was found that increasing reaction temperature benefited the conversion of reactants and pressurized cracking produced a higher crude gasoline yield. At 400 ℃ and 1 MPa, the conversion of the reactants reached over 99% and the selectivity of the gasoline phase reached 42.79% (by mass). The gasoline phase shows outstanding quality, with a hydrocarbon content of 100%. 相似文献
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针对综合能源系统内的燃气多联供展开稳态建模研究,结合成本模型及收益模型开展机组经济性分析。选取GE公司6F.03燃机,研究了燃气多联供机组的供热功率及供电功率耦合关系,开展了包含天然气价格、蒸汽销售价格、蒸汽抽取量、年利用小时数和上网电价在内的多因素敏感性分析。结果表明:通过外供蒸汽流量调节,可满足不同供热及供电功率需求,当外供20 t/h蒸汽时,可提供16.17 MW的供热功率及109 MW供电功率;天然气价格敏感性分析表明,要实现低于10年的投资回收期,应将天然气价格控制在3.25元/m~3以内;增大蒸汽供应量能够提高机组的经济性;上网电价的敏感性最为显著,当低于0.5元/(kW·h),投资回收期会超过24年,但当上网电价达到0.7元/(kW·h),投资回收期可降低至5年。 相似文献
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[目的] 近年来,储能技术及储能产业发展受到的关注度持续升温。 [方法] 在此背景下,对压缩空气储能技术及其商业应用场景进行了分析与综述。通过梳理国内致力于压缩空气储能技术示范的研究团队及其技术特点,较为全面地反映了国内压缩空气储能技术的发展方向;在此基础上,介绍了已投运数十年的德国汉特福及美国阿拉巴马州两座商业化压缩空气储能电站的配置参数及运行经验,综述了近年来国内外针对多种新型压缩空气储能技术的示范进展状况。结合压缩空气储能技术梳理、商业化储能电站回顾及新型压缩空气储能技术示范进展综述三方面的工作,可为国内压缩空气储能技术发展及国家多部委大力推动的储能行业发展提供借鉴。最后,从电源侧储能、电网侧储能及用户侧储能三类应用场景分析了压缩空气储能技术的适应性及应用潜力。 [结果] 德国及美国两座商业化压缩空气储能电站数十年的可靠运行经验,检验了压缩空气储能电站长期运行的可靠性。与此同时,国内自500 kW至10 MW等多容量规模压缩空气储能示范工程的先后投建,表明此项储能技术在国内已实现由理论研究阶段向示范验证阶段的突破。 [结论] 在当下政策环境,用户侧峰谷电价政策是较为典型的储能应用场景边界条件,在压缩空气储能技术推广中可以重点考虑。 相似文献
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Physicochemical properties of bio-oil obtained from fast pyrolysis of rice husk were studied in the present work.Molecular distillation was used to separate the crude bio-oil into three fractions viz.light fraction,middle fraction and heavy fraction.Their chemical composition was analyzed by gas chromatograph and mass spectrometer(GC-MS).The thermal behavior,including evaporation and decomposition,was investigated using thermogravimetric analyzer coupled with Fourier transform infrared spectrometer(TG-FTIR).The product distribution was significantly affected by contents of cellulose,hemicellulose and lignin.The bio-oil yield was 46.36%(by mass) and the yield of gaseous products was 27%(by mass).The chemicals in the bio-oil included acids,aldehydes,ketones,alcohols,phenols,sugars,etc.The light fraction was mainly composed of acids and compounds with lower boiling point temperature,the middle and heavy fractions were consisted of phenols and levoglucosan.The thermal stability of the bio-oil was determined by the interactions and intersolubility of compounds.It was found that the thermal stability of bio-oil was better than the light fraction,but worse than the middle and heavy fractions. 相似文献