为解决交流配电系统存在设备负载率低、冗余度大、故障后恢复供电时间长等问题,提出了一种基于柔性直流的不间断电力交换器(uninterrupted power hub,UPH),并利用电压源换流器将多个配电变电站互联,以实现变电站间负载率均衡、负荷转供...为解决交流配电系统存在设备负载率低、冗余度大、故障后恢复供电时间长等问题,提出了一种基于柔性直流的不间断电力交换器(uninterrupted power hub,UPH),并利用电压源换流器将多个配电变电站互联,以实现变电站间负载率均衡、负荷转供等功能。论文分析了UPH的主要运行方式和控制策略,并通过数字仿真分析了UPH的控制性能。研究结果表明,通过设置固定与变电站连接及灵活在各个变电站切换这2种换流器,并合理配置其容量,UPH可比传统互联方案节省较大的换流器总体容量,是柔性直流技术提升配电网设备利用率和可靠性的一种新方案。论文研究可为柔性直流技术在配电系统中的应用提供参考。展开更多
“In fact, I do this just for the things I like and the career I love,” said Zhu Jianmin, a member of the 13th National Committee of the Chinese People’s Political Consultative Conference (CPPCC) and chairman of Lia...“In fact, I do this just for the things I like and the career I love,” said Zhu Jianmin, a member of the 13th National Committee of the Chinese People’s Political Consultative Conference (CPPCC) and chairman of Liaoning Oxiranchem Inc. After 30 years of dedication to his field, he has elevated his passion for chemistry to something of responsibility and mission.展开更多
IN the 2018 Government Work Report,Chinese Premier Li Keqiang mentioned"high-quality development"six times,and pointed out that China’s economy has moved from a high-speed growth stage to a high-quality dev...IN the 2018 Government Work Report,Chinese Premier Li Keqiang mentioned"high-quality development"six times,and pointed out that China’s economy has moved from a high-speed growth stage to a high-quality development stage.The report delivered at the 19th National Congress of the Communist Party of China(CPC)also stressed to"move Chinese industries up to the medium-high end of the global value chain,and foster a number of world-class advanced manufacturing clusters."展开更多
ON October 17,2014,the 12 Girls Band performed successfully at the Oriental Theater in Changchun,capital of northeast China’s Jilin Province.Their show was a feast for the eyes and ears:12 exquisitely dressed beautie...ON October 17,2014,the 12 Girls Band performed successfully at the Oriental Theater in Changchun,capital of northeast China’s Jilin Province.Their show was a feast for the eyes and ears:12 exquisitely dressed beauties performed classical pieces,such as Liberty and Radetzky March on traditional Chinese instruments like the yangqin(hammered dulcimer),pipa(four-string Chinese lute),erhu(a two-string violin),bamboo flute,xiao(a vertical bamboo flute),hulusi(cucurbit flute)and the展开更多
文摘为解决交流配电系统存在设备负载率低、冗余度大、故障后恢复供电时间长等问题,提出了一种基于柔性直流的不间断电力交换器(uninterrupted power hub,UPH),并利用电压源换流器将多个配电变电站互联,以实现变电站间负载率均衡、负荷转供等功能。论文分析了UPH的主要运行方式和控制策略,并通过数字仿真分析了UPH的控制性能。研究结果表明,通过设置固定与变电站连接及灵活在各个变电站切换这2种换流器,并合理配置其容量,UPH可比传统互联方案节省较大的换流器总体容量,是柔性直流技术提升配电网设备利用率和可靠性的一种新方案。论文研究可为柔性直流技术在配电系统中的应用提供参考。
文摘“In fact, I do this just for the things I like and the career I love,” said Zhu Jianmin, a member of the 13th National Committee of the Chinese People’s Political Consultative Conference (CPPCC) and chairman of Liaoning Oxiranchem Inc. After 30 years of dedication to his field, he has elevated his passion for chemistry to something of responsibility and mission.
文摘IN the 2018 Government Work Report,Chinese Premier Li Keqiang mentioned"high-quality development"six times,and pointed out that China’s economy has moved from a high-speed growth stage to a high-quality development stage.The report delivered at the 19th National Congress of the Communist Party of China(CPC)also stressed to"move Chinese industries up to the medium-high end of the global value chain,and foster a number of world-class advanced manufacturing clusters."
文摘ON October 17,2014,the 12 Girls Band performed successfully at the Oriental Theater in Changchun,capital of northeast China’s Jilin Province.Their show was a feast for the eyes and ears:12 exquisitely dressed beauties performed classical pieces,such as Liberty and Radetzky March on traditional Chinese instruments like the yangqin(hammered dulcimer),pipa(four-string Chinese lute),erhu(a two-string violin),bamboo flute,xiao(a vertical bamboo flute),hulusi(cucurbit flute)and the
