配网线路普遍存在开关位置设置及定值整定问题,引发线路开关越级跳闸或同时跳闸现象。针对这种情况,综合考虑10 k V配网线路所在变电站的电压等级对保护的时限限制及配变励磁涌流的影响,根据变电站的不同提出不同的线路开关分级保护方法...配网线路普遍存在开关位置设置及定值整定问题,引发线路开关越级跳闸或同时跳闸现象。针对这种情况,综合考虑10 k V配网线路所在变电站的电压等级对保护的时限限制及配变励磁涌流的影响,根据变电站的不同提出不同的线路开关分级保护方法,分别给出不同分级保护原则和对应的定值整定原则。在此基础上,对某省域的10 k V配网线路的系统阻抗进行考察统计,给出了有针对性的分级开关设置位置表及定值整定限值。仿真分析结果和实际线路的应用效果验证了该方法的有效性。展开更多
This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristi...This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristics of multistage for the population growth of microorganisms in nonlinear switch dynamic system. The improved model is developed based on the experimental data to describe the delayed, developmental and stationary stages well for the phases of batch culture. Then the existence, uniqueness and boundedness of solutions to the nonlinear multistage switch system and the Lipschitz continuity and differentiability of solutions with respect to the initial state is discussed as well. Finally, a numerical simulation is employed for the nonlinear multistage switch system.展开更多
文摘配网线路普遍存在开关位置设置及定值整定问题,引发线路开关越级跳闸或同时跳闸现象。针对这种情况,综合考虑10 k V配网线路所在变电站的电压等级对保护的时限限制及配变励磁涌流的影响,根据变电站的不同提出不同的线路开关分级保护方法,分别给出不同分级保护原则和对应的定值整定原则。在此基础上,对某省域的10 k V配网线路的系统阻抗进行考察统计,给出了有针对性的分级开关设置位置表及定值整定限值。仿真分析结果和实际线路的应用效果验证了该方法的有效性。
基金supported by the National Natural Science Foundation of China under Grant Nos.11171050,11101262 and 11371164the National Natural Science Foundation for the Youth of China under Grant Nos.11301081,11401073
文摘This paper considers the fed-batch culture in microbial fermentation process, which consists of batch and continuous culture. The goal is to explore the properties of a novel model which can describe the characteristics of multistage for the population growth of microorganisms in nonlinear switch dynamic system. The improved model is developed based on the experimental data to describe the delayed, developmental and stationary stages well for the phases of batch culture. Then the existence, uniqueness and boundedness of solutions to the nonlinear multistage switch system and the Lipschitz continuity and differentiability of solutions with respect to the initial state is discussed as well. Finally, a numerical simulation is employed for the nonlinear multistage switch system.
