Recently, explanations of the sub-synchronous oscillation(SSO) caused by wind farms based on directdriven wind generators(DDWGs) have been published in the literatures, in which the controller parameters of DDWGs and ...Recently, explanations of the sub-synchronous oscillation(SSO) caused by wind farms based on directdriven wind generators(DDWGs) have been published in the literatures, in which the controller parameters of DDWGs and the system equivalent parameters play an important role. However, more than one set of parameters can cause weakly damped sub-synchronous modes. The most vulnerable and highly possible scenario is still unknown. To find scenarios that have potential oscillation risks, this paper proposes a small disturbance model of wind farms with DDWGs connected to the grid using a state-space modeling technique. Taguchi’s orthogonal array testing is introduced to generate different scenarios.Multiple scenarios with different parameter settings that may lead to SSOs are found. A probabilistic analysis method based on the Gaussian mixture model is employed to evaluate the consistency of these scenarios with the actual accidents. Electromagnetic transient simulations are performed to verify the findings.展开更多
目的探讨成果导向教育(outcome based education,OBE)理念下任务驱动教学法在儿科护生带教中的作用。方法根据随机数表法,将2022年3月—2022年6月在重庆医科大学附属永川医院儿科见习的76名护生分为观察组、对照组,各38名。对照组采用...目的探讨成果导向教育(outcome based education,OBE)理念下任务驱动教学法在儿科护生带教中的作用。方法根据随机数表法,将2022年3月—2022年6月在重庆医科大学附属永川医院儿科见习的76名护生分为观察组、对照组,各38名。对照组采用常规教学法,观察组采用OBE理念下任务驱动教学法。比较2组考核成绩、自我导向学习能力(self-rating scale for self-directedness in learning,SRSSDL评分)、核心能力(competency inventory for registered nurse,CIRN评分)与批判性思维(critical thinking disposition inventory‐Chinese version,CTDI-CV评分)、教学评价以及护理质量(service quality,SERVQUAL评分)。结果教学结束后,与对照组相比,观察组考核成绩、SRSSDL评分、CIRN评分、CTDI-CV评分以及SERVQUAL评分均较高,差异有统计学意义(P<0.05)。观察组教学好评率与对照组教学好评率对比,差异无统计学意义(P>0.05)。结论应用OBE理念下任务驱动教学法不仅能有效提升护生的综合素养,培养其自我导向学习能力,锻炼其核心能力与批判性思维,还有助于儿科护理质量的提升,且深受护生认可。展开更多
基金supported in part by National Natural Science Foundation of China (No. U1766206, No. 51677098, and No. 51621065)
文摘Recently, explanations of the sub-synchronous oscillation(SSO) caused by wind farms based on directdriven wind generators(DDWGs) have been published in the literatures, in which the controller parameters of DDWGs and the system equivalent parameters play an important role. However, more than one set of parameters can cause weakly damped sub-synchronous modes. The most vulnerable and highly possible scenario is still unknown. To find scenarios that have potential oscillation risks, this paper proposes a small disturbance model of wind farms with DDWGs connected to the grid using a state-space modeling technique. Taguchi’s orthogonal array testing is introduced to generate different scenarios.Multiple scenarios with different parameter settings that may lead to SSOs are found. A probabilistic analysis method based on the Gaussian mixture model is employed to evaluate the consistency of these scenarios with the actual accidents. Electromagnetic transient simulations are performed to verify the findings.
文摘目的探讨成果导向教育(outcome based education,OBE)理念下任务驱动教学法在儿科护生带教中的作用。方法根据随机数表法,将2022年3月—2022年6月在重庆医科大学附属永川医院儿科见习的76名护生分为观察组、对照组,各38名。对照组采用常规教学法,观察组采用OBE理念下任务驱动教学法。比较2组考核成绩、自我导向学习能力(self-rating scale for self-directedness in learning,SRSSDL评分)、核心能力(competency inventory for registered nurse,CIRN评分)与批判性思维(critical thinking disposition inventory‐Chinese version,CTDI-CV评分)、教学评价以及护理质量(service quality,SERVQUAL评分)。结果教学结束后,与对照组相比,观察组考核成绩、SRSSDL评分、CIRN评分、CTDI-CV评分以及SERVQUAL评分均较高,差异有统计学意义(P<0.05)。观察组教学好评率与对照组教学好评率对比,差异无统计学意义(P>0.05)。结论应用OBE理念下任务驱动教学法不仅能有效提升护生的综合素养,培养其自我导向学习能力,锻炼其核心能力与批判性思维,还有助于儿科护理质量的提升,且深受护生认可。
