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关于多特征自变量调节的含UPFC电力系统的潮流变化率特性 被引量:4
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作者 刘津濂 徐政 +2 位作者 杨健 张哲任 宋鹏程 《电力自动化设备》 EI CSCD 北大核心 2021年第1期186-191,210,共7页
含统一潮流控制器(UPFC)的电力系统潮流变化率或调节效率主要由UPFC输出的串联侧嵌入电压(OSIV)的幅值和相角以及系统相角差所决定。选择这3个变量作为系统潮流调节的特征自变量(CIV),以含UPFC双端电力系统的实际电路为背景,推导了系统... 含统一潮流控制器(UPFC)的电力系统潮流变化率或调节效率主要由UPFC输出的串联侧嵌入电压(OSIV)的幅值和相角以及系统相角差所决定。选择这3个变量作为系统潮流调节的特征自变量(CIV),以含UPFC双端电力系统的实际电路为背景,推导了系统不同关键节点处关于每个CIV的有功与无功潮流变化率数学模型。以系统潮流调节自由度和调节效率为依据,对系统潮流变化率的调节特性进行了理论分析。设置了多种典型系统运行工况,基于OSIV幅值和相角的2种递增变化组合方式设计了2种潮流变化率调节模式,并设计了关于系统相角差的多种典型调节场景。最后,对系统每个关键节点处的关于每个CIV的潮流变化率特性进行了案例测试与分析,所得结论有利于综合协调潮流调节效率与系统保护及稳定性的要求,使电网既高效又稳定地运行。 展开更多
关键词 统一潮流控制器 串联侧嵌入电压 潮流变化率 特征自变量 关键节点 系统运行工况
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Multivariate Analysis of Recurrence in Meningioma
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作者 吴涛 吴志敏 +1 位作者 袁先厚 陈卫国 《The Chinese-German Journal of Clinical Oncology》 CAS 2005年第1期26-29,66,共5页
Objective: To evaluate the clinical and radiological factors that affect therecurrence of the meningioma patient so as to effectively prevent and cure recurrence of meningiomapatients more earlier. Methods: The clinic... Objective: To evaluate the clinical and radiological factors that affect therecurrence of the meningioma patient so as to effectively prevent and cure recurrence of meningiomapatients more earlier. Methods: The clinical features and radiological aspects in 145 cases ofmeningiomas undergoing operation during 1993-1997 were retrospectively studied. The data of only 83cases of all 145 cases were available. The factors were evaluated with univariate and multivariateanalysis. Results: With univariate analysis, 7 factors showed highly significance to recurrence ofmeningiomas: tumor size, tumor location, tumor shape, edema, extent of resection, pathologicalgrade, CT enhancement. With multivariate analysis, 4 factors showed significant danger to recurrenceof meningiomas: pathological grade, extent of resection, tumor shape and CT enhancement.Conclusion: The main factors that affect the recurrence of meningioma patients are pathologicalgrade, extent of resection, tumor shape and CT enhancement. 展开更多
关键词 MENINGIOMA clinical factors radiological features RECURRENCE
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