“网络联校”促进区域教育优质均衡发展——以湖南省长沙市“三个课堂”应用为例

“三个课堂”是信息技术与教育教学深度融合应用的具体体现,全面实现“三个课堂”在中小学的常态化按需应用可以促进优质教育资源的共建共享,促进教师专业素养和信息素养的不断提升。分析了“网络联校”在湖南省长沙市的应用实践,围绕其在长效机制、资源建设、绩效考核等方面的实践探索,联通区域、校际、城乡教育一体化发展,旨在推进基础教育从基本均衡迈向优质均衡,以教育信息化支撑和引领教育现代化发展。

Harmonic Filter Design to Mitigate Two Resonant Points in a Distribution Network

This paper investigates the usage of passive harmonic filters to mitigate harmonic distortions when two resonant points are present in a system caused by shunt capacitors used for power factor correction and bus voltage regulation. Six scenarios were investigated using DIgSILENT 14 power factor）＇ software. The investigations are with and without power factor correction and capacitors used to increase bus voltage. Passive harmonic filters are designed to reduce harmonic distortions at the PCC （point of common coupling） to fall within the IEEE 519 harmonic voltage and current limits caused by parallel resonance. The results of the case studies are analysed to evaluate the effectiveness of the filter design.