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基于支路视在功率灵敏度的故障后电压计算 被引量:1
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作者 钟浩 吴政球 +1 位作者 张小兵 邓阳 《电力自动化设备》 EI CSCD 北大核心 2012年第2期34-38,共5页
提出了基于支路视在功率灵敏度的N-1网络电压快速计算方法。支路故障采用故障开断参数来模拟,首先通过牛顿潮流计算出故障前网络节点电压,然后利用已收敛潮流修正方程式对支路开断参数求导,从而计算出电压对相应支路开断参数的导数,进... 提出了基于支路视在功率灵敏度的N-1网络电压快速计算方法。支路故障采用故障开断参数来模拟,首先通过牛顿潮流计算出故障前网络节点电压,然后利用已收敛潮流修正方程式对支路开断参数求导,从而计算出电压对相应支路开断参数的导数,进一步得到节点电压对故障支路故障前视在功率的导数,最后根据视在功率灵敏度修正故障前网络电压,得到故障后网络电压。方法特点是在计算不同支路故障的导数时共用潮流计算收敛时的雅可比矩阵,不用重新进行因子表分解。由于节点电压与支路功率之间的良好线性关系,所提方法计算精度较高。IEEE14节点、IEEE30节点、IEEE118节点网络和湖南实际系统的测试结果证明了该方法的正确性和实用价值。 展开更多
关键词 支路开断参数 灵敏度分析 功率导数 故障电压 潮流计算 视在功率
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Effect of Adsorbent Diameter on the Performance of Adsorption Refrigeration 被引量:1
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作者 黄宏宇 何兆红 +4 位作者 袁浩然 小林敬幸 赵丹丹 窪田光宏 郭华芳 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2014年第5期602-606,共5页
Adsorbents are important components in adsorption refrigeration. The diameter of an adsorbent can affect the heat and mass transfer of an adsorber. The effect of particle diameter on effective thermal conductivity was... Adsorbents are important components in adsorption refrigeration. The diameter of an adsorbent can affect the heat and mass transfer of an adsorber. The effect of particle diameter on effective thermal conductivity was investigated. The heat transfer coefficient of the refrigerant and the void rate of the adsorbent layer can also affect the effective thermal conductivity of adsorbents. The performance of mass transfer in the adsorber is better when pressure drop decreases. Pressure drop decreases with increasing permeability. The permeability of the adsorbent layer can be improved with increasing adsorbent diameter. The effect of adsorbent diameter on refrigeration output power was experimentally studied. Output power initially increases and then decreases with increasing diameter under different cycle time conditions. Output power increases with decreasing cycle time under similar diameters. 展开更多
关键词 adsorption refrigeration heat and mass transfer adsorbent diameter thermal conduction PERMEABILITY
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