Pulmonary sclerosing pneumocytoma(PSP)was first reported by Liebow and Hubbell(1956).It was initially called pulmonary sclerosing hemangioma(PSH)because it was thought to be derived from endothelial cells with rich va...Pulmonary sclerosing pneumocytoma(PSP)was first reported by Liebow and Hubbell(1956).It was initially called pulmonary sclerosing hemangioma(PSH)because it was thought to be derived from endothelial cells with rich vascularity.However,the 2015 World Health Organization Classification of Lung Tumors removed the term"sclerosing hemangioma,1 since these tumors lack vascular origin(Travis et al.2015),and the renamed tumor was considered a rare and benign lung tumor.However,several reports have described PSP with lymph node metastasis(Soo et al.,2017).Thus,PSP is not always benign and has the potential to metastasize.展开更多
含分布式电源(distributed generation,DG)的双极直流配电系统是未来配电网发展的重要形态之一,但由于DG接入方式、数量、容量、位置以及系统正负极负荷不平衡对系统静暂态电压稳定性影响不同,目前相关研究尚缺乏对此问题的分析。该文...含分布式电源(distributed generation,DG)的双极直流配电系统是未来配电网发展的重要形态之一,但由于DG接入方式、数量、容量、位置以及系统正负极负荷不平衡对系统静暂态电压稳定性影响不同,目前相关研究尚缺乏对此问题的分析。该文首先将DG等效为受控电流源,推导分析了DG接入方式、容量及负荷不平衡度对系统静态下电压不平衡度的影响;其次,基于单极故障下光伏型DG与交流电网暂态放电情况,推导分析了DG接入方式、位置、容量与系统暂态电压稳定性的关系;再者,基于多目标蜣螂优化算法提出以系统静暂态电压稳定性与DG接入成本为目标的DG接入方案规划方法,采用熵权逼近理想解排序法(technique for order preference by similarity to ideal solution,TOPSIS)法筛选出DG接入的最佳折中方案。最后在Matlab/Simulink仿真平台搭建改进IEEE14、IEEE33双极直流配电系统验证该文所提优化方法的普适性和有效性。展开更多
基金supported by the Zhejiang Province Public Welfare Technology Application Research Project(No.LGF19H220003),China.
文摘Pulmonary sclerosing pneumocytoma(PSP)was first reported by Liebow and Hubbell(1956).It was initially called pulmonary sclerosing hemangioma(PSH)because it was thought to be derived from endothelial cells with rich vascularity.However,the 2015 World Health Organization Classification of Lung Tumors removed the term"sclerosing hemangioma,1 since these tumors lack vascular origin(Travis et al.2015),and the renamed tumor was considered a rare and benign lung tumor.However,several reports have described PSP with lymph node metastasis(Soo et al.,2017).Thus,PSP is not always benign and has the potential to metastasize.
文摘含分布式电源(distributed generation,DG)的双极直流配电系统是未来配电网发展的重要形态之一,但由于DG接入方式、数量、容量、位置以及系统正负极负荷不平衡对系统静暂态电压稳定性影响不同,目前相关研究尚缺乏对此问题的分析。该文首先将DG等效为受控电流源,推导分析了DG接入方式、容量及负荷不平衡度对系统静态下电压不平衡度的影响;其次,基于单极故障下光伏型DG与交流电网暂态放电情况,推导分析了DG接入方式、位置、容量与系统暂态电压稳定性的关系;再者,基于多目标蜣螂优化算法提出以系统静暂态电压稳定性与DG接入成本为目标的DG接入方案规划方法,采用熵权逼近理想解排序法(technique for order preference by similarity to ideal solution,TOPSIS)法筛选出DG接入的最佳折中方案。最后在Matlab/Simulink仿真平台搭建改进IEEE14、IEEE33双极直流配电系统验证该文所提优化方法的普适性和有效性。
