排序方式: 共有18条查询结果,搜索用时 15 毫秒
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LIU QiBin WANG YaLong GAO ZhiChao SUI Jun JIN HongGuang & LI HePing Institute of Engineering Thermophysics Chinese Academy of Sciences Beijing China Graduate University of Chinese Academy of Sciences Beijing China Huadian Engineering Co. Ltd Beijing 《中国科学:信息科学(英文版)》2010,(1)
Developing solar thermal power technology in an effective manner is a great challenge in China.In this paper an experiment platform of a parabolic trough solar collector system(PTCS) was developed for thermal power generation,and the performance of the PTCS was experimentally investigated with synthetic oil as the circulate heat transfer fluid(HTF).The solar collector's efficiency with the variation of the solar flux and the flow rate of the HTF was identified.The collector efficiency of the PTCS can be in ... 相似文献
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微网逆变器低电压穿越控制策略 总被引:1,自引:1,他引:0
微网逆变器一般采用下垂控制或虚拟同步机控制,其低电压穿越方式及特性与基于PQ控制的逆变器不同。下垂控制或虚拟同步机控制的逆变器低电压穿越的主要问题是在故障期间逆变器电压与电网电压之间不断产生相位的偏移,该相位偏移会严重影响并网电流恢复的速度。针对上述问题,提出一种在故障期间对功角等变量进行记忆保持的策略,使变量在故障前后基本保持一致,以实现故障后系统的快速恢复。针对故障期间产生的负序分量,采用在双同步旋转坐标系下对正、负序电流进行独立控制并引入电网电压前馈的方法。仿真和实验均验证了控制策略的正确性和有效性。 相似文献
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Zhang Huadian Shukla Manoj K. Larson Steve Rajendran A. M. Jiang Shan 《Journal of Materials Science》2022,57(12):6688-6705
Journal of Materials Science - This paper presents an investigation aimed at understanding the shock wave propagation response of oriented α-quartz single crystals by using molecular dynamics... 相似文献
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Chen Zongfa Director of the Office of System Reform of China Huadian Corporation Zhang Sufang 《电气》2009,(2)
Since October 2008,China‘s social consumption of electricity had,for the first time,grown negatively compared to the same period of the previous year,and in November the negative growth range further expanded. The major pressure faced by the electricity industry has now turned from the contradiction between coal and electricity to electricity quantity. This is undoubtedly a true and new test to electricity enterprises which get used to high growth but are now suffering great losses. The reform of electricit... 相似文献
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Sheng Xing Yin Juan Shang Jingfu Yu Yang Wu Zhangxian . State Grid Information & Telecommunication Co. Ltd. . China Huadian Finance Corporation Limited . State Grid AC Engineering Construction Company . Northeast China Electric Power Dispatching & Communication Center . North China Electric Power University 《电气》2011,(4):62-66
An energy-saving control strategy based on predictive control for central air-conditioning systems is proposed in this paper. The cold load model is developed to describe the dynamic characteristics of temperature control systems, and then parameters in the cold load model and in the central air-conditioning system model are estimated. Generalized predictive control (GPC) is used to establish an optimization model to minimize the consumption of energy and the control error of temperature. The simulated annealing (SA) algorithm, combined with quadratic programming, is adopted to solve the optimal problem. Contrasted with the simulation of traditional PID control, the results prove the effectiveness of this proposed strategy. 相似文献
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提出了一种新的基于信号能量谱分析ESA(energy spectrum analysis)的孤岛检测方法,并对所提出的检测特征量在孤岛发生前后的变化进行了深入分析,对ESA方法的孤岛检测有效性及抗扰动性进行了仿真及实验验证。实验结果表明,ESA方法在分布式发电单元与本地并联谐振负载间存在功率匹配,传统过/欠电压、过/欠频率方法落入盲区内时仍可有效识别孤岛,检测需时远小于IEEE 1547-2003标准所规定的时间,且不易受系统暂态过程影响;同时,由于没有向系统中加入扰动信号,不会对电能质量产生影响。 相似文献
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以并排多通管内高压成形工艺为研究对象,在支管总间距一定的条件下,相邻支管间距由外到里成等差数列,对几种典型支管排列方式下并排多通管内高压成形工艺进行模拟分析.结果表明:在相同加载路径条件下,相邻支管间距由外到里逐渐增加时支管平均高度高于支管等间距排列和支管间距由外到里逐渐减小的排列方式,此时支管等间距排列时支管高度分布最均匀.加载路径修正后,相邻支管间距由外到里逐渐增加的支管排列方式得到的支管平均高度明显高于其他排列方式,且增加幅度越大,支管平均高度越高,各支管高度分布越均匀.不同支管排列方式最终得到的并排多通管壁厚分布规律基本相同. 相似文献