孤岛检测的方法很多,尤其是主动式孤岛检测方法。如何在众多的主动孤岛检测法中选择最合适的方法是应用中的难点。针对主动法中的应用较多的滑模频率偏移法和有源频率偏移法,分别对其检测盲区、检测速度、对电能质量影响进行机理分析。...孤岛检测的方法很多,尤其是主动式孤岛检测方法。如何在众多的主动孤岛检测法中选择最合适的方法是应用中的难点。针对主动法中的应用较多的滑模频率偏移法和有源频率偏移法,分别对其检测盲区、检测速度、对电能质量影响进行机理分析。理论分析结果表明在盲区相同时,SMS(Slip-Mode Frequency Shift)法造成的逆变电流总谐波含量更小,但SMS法的检测速度在不同参数条件下存在较大区别。在Matlab/Simulink中对孤岛检测方法进行建模,实验结果证明了理论分析的正确性。展开更多
Magnetic Fe-containing ordered mesoporous carbons （Fe/OMCs） with high surface areas and pore volume were synthesized through a simple soft-template route, wherein phenolic resin was used as a carbon precursor, tribl...Magnetic Fe-containing ordered mesoporous carbons （Fe/OMCs） with high surface areas and pore volume were synthesized through a simple soft-template route, wherein phenolic resin was used as a carbon precursor, triblock copolymer F127 as a template agent, tetraethyl orthosilicate （TEOS） as a silica precursor and hydrated iron nitrate as an iron source. The effects of carbonization temperature, loading degree of TEOS on the structural parameters of these Fe/OMCs were evaluated by X-ray diffraction （XRD） and Nz sorption analysis. The ordering, the specific surface area and the total pore volumes increased with the increase of carbonization temperature from 600 to 850 ~C. And the specific surface area and the total pore volumes increased with the increase of TEOS loading.展开更多
文摘孤岛检测的方法很多,尤其是主动式孤岛检测方法。如何在众多的主动孤岛检测法中选择最合适的方法是应用中的难点。针对主动法中的应用较多的滑模频率偏移法和有源频率偏移法,分别对其检测盲区、检测速度、对电能质量影响进行机理分析。理论分析结果表明在盲区相同时,SMS(Slip-Mode Frequency Shift)法造成的逆变电流总谐波含量更小,但SMS法的检测速度在不同参数条件下存在较大区别。在Matlab/Simulink中对孤岛检测方法进行建模,实验结果证明了理论分析的正确性。
基金Funded by the National Natural Science Foundation of China(50802017)the Higher Education Talents Introducing Fund of Guangdong Province(2011Annual)+2 种基金the Natural Science Foundation of Guangdong Province(S2012010009416)the Foundation for Distinguished Young Talents in Higher Education of Guangdong(2012LYM_0085)the Planned Project of Science and Technology of Guangdong Province(2012B020316007,2012A020602058)
文摘Magnetic Fe-containing ordered mesoporous carbons （Fe/OMCs） with high surface areas and pore volume were synthesized through a simple soft-template route, wherein phenolic resin was used as a carbon precursor, triblock copolymer F127 as a template agent, tetraethyl orthosilicate （TEOS） as a silica precursor and hydrated iron nitrate as an iron source. The effects of carbonization temperature, loading degree of TEOS on the structural parameters of these Fe/OMCs were evaluated by X-ray diffraction （XRD） and Nz sorption analysis. The ordering, the specific surface area and the total pore volumes increased with the increase of carbonization temperature from 600 to 850 ~C. And the specific surface area and the total pore volumes increased with the increase of TEOS loading.
