模块化多电平换流器型高压直流输电以其独特的技术优势,已成为未来电压源换流器型高压直流输电(Voltage Source Converter based HVDC)领域的发展趋势。MMC是未来高压直流输电传输系统的重要组成部分,半桥型子模块、双箝位型子模块和全...模块化多电平换流器型高压直流输电以其独特的技术优势,已成为未来电压源换流器型高压直流输电(Voltage Source Converter based HVDC)领域的发展趋势。MMC是未来高压直流输电传输系统的重要组成部分,半桥型子模块、双箝位型子模块和全桥型子模块是MMC三种主要的可选择的子模块拓扑结构。分析了MMC的通用拓扑结构及三种常见子模块的拓扑结构和工作模式,得出了不同子模块结构的特点,最后通过仿真验证了不同子模块拓扑结构的直流故障穿越能力,并对比分析了采用不同子模块拓扑结构MMC的基本特性。展开更多
The AC/DC hybrid distribution network is one of the trends in distribution network development, which poses great challenges to the traditional distribution transformer. In this paper, a new topology suitable for AC/D...The AC/DC hybrid distribution network is one of the trends in distribution network development, which poses great challenges to the traditional distribution transformer. In this paper, a new topology suitable for AC/DC hybrid distribution network is put forward according to the demands of power grid, with advantages of accepting DG and DC loads, while clearing DC fault by blocking the clamping double sub-module(CDSM) of input stage. Then, this paper shows the typical structure of AC/DC distribution network that is hand in hand. Based on the new topology, this paper designs the control and modulation strategies of each stage, where the outer loop controller of input stage is emphasized for its twocontrol mode. At last, the rationality of new topology and the validity of control strategies are verified by the steady and dynamic state simulation. At the same time, the simulation results highlight the role of PET in energy regulation.展开更多
人们在面对体量庞大的数据信息时,如何从繁冗的数据构成中,快速提取出适合自身实际发展需求的数据信息,成为一项必要技能。虽然已有相当的理论为既有的数据分析理论背书,但仍不乏其局限性。作者在此提出一种新的数据结构模型理论——克...人们在面对体量庞大的数据信息时,如何从繁冗的数据构成中,快速提取出适合自身实际发展需求的数据信息,成为一项必要技能。虽然已有相当的理论为既有的数据分析理论背书,但仍不乏其局限性。作者在此提出一种新的数据结构模型理论——克苏鲁式数据结构模型(Cthulhu Data Structure Model,简称CDSM),为读者说明该数据理论的特征以及在数据传递过程中,该理论对数据选择的影响。展开更多
文摘模块化多电平换流器型高压直流输电以其独特的技术优势,已成为未来电压源换流器型高压直流输电(Voltage Source Converter based HVDC)领域的发展趋势。MMC是未来高压直流输电传输系统的重要组成部分,半桥型子模块、双箝位型子模块和全桥型子模块是MMC三种主要的可选择的子模块拓扑结构。分析了MMC的通用拓扑结构及三种常见子模块的拓扑结构和工作模式,得出了不同子模块结构的特点,最后通过仿真验证了不同子模块拓扑结构的直流故障穿越能力,并对比分析了采用不同子模块拓扑结构MMC的基本特性。
基金supported by National Key Research and Development Program of China (2016YFB0900500,2017YFB0903100)the State Grid Science and Technology Project (SGRI-DL-F1-51-011)
文摘The AC/DC hybrid distribution network is one of the trends in distribution network development, which poses great challenges to the traditional distribution transformer. In this paper, a new topology suitable for AC/DC hybrid distribution network is put forward according to the demands of power grid, with advantages of accepting DG and DC loads, while clearing DC fault by blocking the clamping double sub-module(CDSM) of input stage. Then, this paper shows the typical structure of AC/DC distribution network that is hand in hand. Based on the new topology, this paper designs the control and modulation strategies of each stage, where the outer loop controller of input stage is emphasized for its twocontrol mode. At last, the rationality of new topology and the validity of control strategies are verified by the steady and dynamic state simulation. At the same time, the simulation results highlight the role of PET in energy regulation.
文摘人们在面对体量庞大的数据信息时,如何从繁冗的数据构成中,快速提取出适合自身实际发展需求的数据信息,成为一项必要技能。虽然已有相当的理论为既有的数据分析理论背书,但仍不乏其局限性。作者在此提出一种新的数据结构模型理论——克苏鲁式数据结构模型(Cthulhu Data Structure Model,简称CDSM),为读者说明该数据理论的特征以及在数据传递过程中,该理论对数据选择的影响。
