The intense application of Voltage Source Converter based HVDC interconnections and grids will result in a hybrid AC-HVDC-system. The operation of such a system becomes complex regarding system security and system ope...The intense application of Voltage Source Converter based HVDC interconnections and grids will result in a hybrid AC-HVDC-system. The operation of such a system becomes complex regarding system security and system operation. This paper describes major challenges and proposes potential solutions, including a combined security assessment, preventive optimization and curative actions. A coordination of both systems enables an efficient application of existing transport capacity.展开更多
High-temperature superconducting(HTS)technology provides an alternative approach to achieve compact transformers.Addressing AC loss in the HTS winding is crucial for HTS transformer applications.Most numerical AC loss...High-temperature superconducting(HTS)technology provides an alternative approach to achieve compact transformers.Addressing AC loss in the HTS winding is crucial for HTS transformer applications.Most numerical AC loss studies on HTS transformers have neglected the influence of iron cores.This work carries out an AC loss study to explore the impact of an iron core on the HTS windings in a 3-phase HTS 1 MVA transformer coupled with it.AC loss simulations for the transformer winding both with and without the iron core are conducted by adopting the three-dimensional(3D)T-A homogenization method.When the iron core is incorporated,the saturation magnetic fields of iron materials,flux diverters(FDs)with different geometries,and variations in turn spacings in the LV winding composed of Roebel cables are considered to investigate their influence on the AC loss of the transformer winding.The inclusion of the iron core leads to a 1.2%increase in AC loss for the transformer winding while simulating at the rated current.We attribute this slight difference to the non-inductive winding structure of the transformer winding,where a strong magnetic field generated in the space between the LV and HV windings effectively shields the influence of the iron core.展开更多
目的:研究治疗便血方剂的用药规律及其“核心配伍-作用靶点”的关联性。方法:从《中医方剂大辞典》中筛选治疗便血的方剂,录入数据库,进行频数、聚类和关联分析,从中发现配伍组方规律。找到核心配伍组合后,再使用中药分子机制的生物信...目的:研究治疗便血方剂的用药规律及其“核心配伍-作用靶点”的关联性。方法:从《中医方剂大辞典》中筛选治疗便血的方剂,录入数据库,进行频数、聚类和关联分析,从中发现配伍组方规律。找到核心配伍组合后,再使用中药分子机制的生物信息学分析工具(Bioinformatics Analysis Tool for Molecular Mechanism of Traditional Chinese Medicine,BATMAN-TCM)对核心配伍组合进行活性成分-靶点预测,从而分析核心配伍组合的共同作用靶点。结果:共收录便血方剂616首,涉及中药340味;排名前10的高频药物依次是当归、甘草、黄连、芍药、枳壳、生地黄、黄芩、地榆、槐花、黄芪;主要使用的中药类别依次是补虚药、清热药、止血药。发现生地黄、黄芩、赤芍,人参、白术、茯苓,侧柏叶、地榆、槐花,当归和川芎等是治疗便血的四组核心配伍组合;经分析发现这四组核心配伍组合均有AR、ESR1、NR3C1、PGR、VDR这5个共同作用靶点,即治疗便血的11个核心药物有5个共同作用靶点。结论:《中医方剂大辞典》所载便血方剂的核心配伍组合关联的AR、NR3C1、PGR、VDR等靶点与肠炎、结直肠癌、胃癌等常导致便血的相关疾病密切相关,提示其“核心配伍-作用靶点”的关联性对于指导临床用药以及相关基础研究和新药开发有一定参考意义。展开更多
文摘The intense application of Voltage Source Converter based HVDC interconnections and grids will result in a hybrid AC-HVDC-system. The operation of such a system becomes complex regarding system security and system operation. This paper describes major challenges and proposes potential solutions, including a combined security assessment, preventive optimization and curative actions. A coordination of both systems enables an efficient application of existing transport capacity.
基金New Zealand Ministry of Business,Innovation and Employment(MBIE)Strategic Science Investment Fund“Advanced Energy Technology Platforms”under contract No.RTVU2004.
文摘High-temperature superconducting(HTS)technology provides an alternative approach to achieve compact transformers.Addressing AC loss in the HTS winding is crucial for HTS transformer applications.Most numerical AC loss studies on HTS transformers have neglected the influence of iron cores.This work carries out an AC loss study to explore the impact of an iron core on the HTS windings in a 3-phase HTS 1 MVA transformer coupled with it.AC loss simulations for the transformer winding both with and without the iron core are conducted by adopting the three-dimensional(3D)T-A homogenization method.When the iron core is incorporated,the saturation magnetic fields of iron materials,flux diverters(FDs)with different geometries,and variations in turn spacings in the LV winding composed of Roebel cables are considered to investigate their influence on the AC loss of the transformer winding.The inclusion of the iron core leads to a 1.2%increase in AC loss for the transformer winding while simulating at the rated current.We attribute this slight difference to the non-inductive winding structure of the transformer winding,where a strong magnetic field generated in the space between the LV and HV windings effectively shields the influence of the iron core.
文摘目的:研究治疗便血方剂的用药规律及其“核心配伍-作用靶点”的关联性。方法:从《中医方剂大辞典》中筛选治疗便血的方剂,录入数据库,进行频数、聚类和关联分析,从中发现配伍组方规律。找到核心配伍组合后,再使用中药分子机制的生物信息学分析工具(Bioinformatics Analysis Tool for Molecular Mechanism of Traditional Chinese Medicine,BATMAN-TCM)对核心配伍组合进行活性成分-靶点预测,从而分析核心配伍组合的共同作用靶点。结果:共收录便血方剂616首,涉及中药340味;排名前10的高频药物依次是当归、甘草、黄连、芍药、枳壳、生地黄、黄芩、地榆、槐花、黄芪;主要使用的中药类别依次是补虚药、清热药、止血药。发现生地黄、黄芩、赤芍,人参、白术、茯苓,侧柏叶、地榆、槐花,当归和川芎等是治疗便血的四组核心配伍组合;经分析发现这四组核心配伍组合均有AR、ESR1、NR3C1、PGR、VDR这5个共同作用靶点,即治疗便血的11个核心药物有5个共同作用靶点。结论:《中医方剂大辞典》所载便血方剂的核心配伍组合关联的AR、NR3C1、PGR、VDR等靶点与肠炎、结直肠癌、胃癌等常导致便血的相关疾病密切相关,提示其“核心配伍-作用靶点”的关联性对于指导临床用药以及相关基础研究和新药开发有一定参考意义。
