柔性交流输电系统(flexible AC transmission system,FACTS)的并网位置对电力系统的安全运行具有重要影响。本文综合考虑故障发生后的暂态与稳态过程,提出兼顾暂稳态判据的选址打分方法,在单机等面积定则基础上,推导出FACTS元件等值系...柔性交流输电系统(flexible AC transmission system,FACTS)的并网位置对电力系统的安全运行具有重要影响。本文综合考虑故障发生后的暂态与稳态过程,提出兼顾暂稳态判据的选址打分方法,在单机等面积定则基础上,推导出FACTS元件等值系统的暂态裕度量化积分,将暂态稳定裕度近似灵敏度和稳态母线电压越限危险度作为选址依据。基于FACTS元件与储能相结合技术,将有功死区控制、电池荷电状态限制和逆变器容量限制考虑进FACTS元件建模中,利用PSASP/UD自定义模块搭建具有储能作用的FACTS模型。通过电力系统分析软件PSASP中CEPRI-36节点系统进行仿真,在得分高的母线处采取FACTS元件以注入电流源形式并网参与系统紧急控制,验证本文所提选址方法的准确性及FACTS元件对抑制电力系统连锁故障扩散的影响。展开更多
In light of the traditional teaching method used in English classes in China and many other places, this article states the importance of linking instruction and assessment in the English teaching process and presents...In light of the traditional teaching method used in English classes in China and many other places, this article states the importance of linking instruction and assessment in the English teaching process and presents different approaches to linking instruction and assessment in classroom teaching which are proven effective in solidifying students' knowledge of English and improving students' comprehensive English competence. Then, based on the results from the assessments, a Fuzzy Comprehensive Grading Approach is adopted in calculating students' final grade. The Approach is based on the fuzzy set theory of fuzzy mathematics, and it considers diverse factors and assigns proper weight to different factors in grading, using fuzzy matrix operation in calculating students' grades; therefore, it is comprehensive and reliable, and can avoid the influence of odd scores and give a truer and more balanced measurement of students' English ability.展开更多
文摘柔性交流输电系统(flexible AC transmission system,FACTS)的并网位置对电力系统的安全运行具有重要影响。本文综合考虑故障发生后的暂态与稳态过程,提出兼顾暂稳态判据的选址打分方法,在单机等面积定则基础上,推导出FACTS元件等值系统的暂态裕度量化积分,将暂态稳定裕度近似灵敏度和稳态母线电压越限危险度作为选址依据。基于FACTS元件与储能相结合技术,将有功死区控制、电池荷电状态限制和逆变器容量限制考虑进FACTS元件建模中,利用PSASP/UD自定义模块搭建具有储能作用的FACTS模型。通过电力系统分析软件PSASP中CEPRI-36节点系统进行仿真,在得分高的母线处采取FACTS元件以注入电流源形式并网参与系统紧急控制,验证本文所提选址方法的准确性及FACTS元件对抑制电力系统连锁故障扩散的影响。
文摘In light of the traditional teaching method used in English classes in China and many other places, this article states the importance of linking instruction and assessment in the English teaching process and presents different approaches to linking instruction and assessment in classroom teaching which are proven effective in solidifying students' knowledge of English and improving students' comprehensive English competence. Then, based on the results from the assessments, a Fuzzy Comprehensive Grading Approach is adopted in calculating students' final grade. The Approach is based on the fuzzy set theory of fuzzy mathematics, and it considers diverse factors and assigns proper weight to different factors in grading, using fuzzy matrix operation in calculating students' grades; therefore, it is comprehensive and reliable, and can avoid the influence of odd scores and give a truer and more balanced measurement of students' English ability.
