具有高比例新能源和高比例电力电子设备的新型电力系统是实现“双碳”目标的重要手段,但新型电力系统也会带来一系列不稳定的问题。在新型电力系统中,构网型控制技术(grid-forming control technology,GFM)具有电压支撑和主动惯量特性,...具有高比例新能源和高比例电力电子设备的新型电力系统是实现“双碳”目标的重要手段,但新型电力系统也会带来一系列不稳定的问题。在新型电力系统中,构网型控制技术(grid-forming control technology,GFM)具有电压支撑和主动惯量特性,以此替代同步机实现电网支撑,并维持电力系统稳定性,因此GFM具有广阔的发展和应用前景。基于此,首先,对储能变流器的拓扑进行简要介绍,并针对GFM技术的控制特点为其选型;其次,对于现有的构网型控制策略进行总结分析;最后,提出当前研究难点以及发展过程中所面临的问题和挑战,为构网型控制技术今后的发展建设提供思路。展开更多
柔性直流输电系统在交直流系统互联、大规模风光并网等方面具有较强的技术优势,随着高压大容量多端柔性直流输电系统的逐步应用和推广,现有调度主站的监控功能已不能满足其发展需求。文中详细分析了华北±500 k V/3000 MW四端环形...柔性直流输电系统在交直流系统互联、大规模风光并网等方面具有较强的技术优势,随着高压大容量多端柔性直流输电系统的逐步应用和推广,现有调度主站的监控功能已不能满足其发展需求。文中详细分析了华北±500 k V/3000 MW四端环形柔性直流电网的拓扑结构和关键设备特性,面向半桥型模块化多电平换流器+直流断路器的组网方式,以换流站无人职守为目标,提出了基于主站调度控制系统的监视功能框架,给出了电网建模、信息采集、拓扑分析及智能告警等主要监视模块的功能方案,以支撑对高压大容量柔性直流电网的监视,为后期工程实施提供借鉴。展开更多
The article has been retracted due to the investigation of complaints received against it. The Editorial Board found that substantial portions of the text quite like the one published in other journal. The problem is ...The article has been retracted due to the investigation of complaints received against it. The Editorial Board found that substantial portions of the text quite like the one published in other journal. The problem is under investigation. This paper published in Vol.4 No.1, 2012, has been removed from this site temporally.展开更多
Reliability and optimization are two key elements for structural design. The reliability~ based topology optimization （RBTO） is a powerful and promising methodology for finding the optimum topologies with the uncert...Reliability and optimization are two key elements for structural design. The reliability~ based topology optimization （RBTO） is a powerful and promising methodology for finding the optimum topologies with the uncertainties being explicitly considered, typically manifested by the use of reliability constraints. Generally, a direct integration of reliability concept and topol- ogy optimization may lead to computational difficulties. In view of this fact, three methodologies have been presented in this study, including the double-loop approach （the performance measure approach, PMA） and the decoupled approaches （the so-called Hybrid method and the sequential optimization and reliability assessment, SORA）. For reliability analysis, the stochastic response surface method （SRSM） was applied, combining with the design of experiments generated by the sparse grid method, which has been proven as an effective and special discretization technique. The methodologies were investigated with three numerical examples considering the uncertainties including material properties and external loads. The optimal topologies obtained using the de- terministic, RBTOs were compared with one another; and useful conclusions regarding validity, accuracy and efficiency were drawn.展开更多
文摘具有高比例新能源和高比例电力电子设备的新型电力系统是实现“双碳”目标的重要手段,但新型电力系统也会带来一系列不稳定的问题。在新型电力系统中,构网型控制技术(grid-forming control technology,GFM)具有电压支撑和主动惯量特性,以此替代同步机实现电网支撑,并维持电力系统稳定性,因此GFM具有广阔的发展和应用前景。基于此,首先,对储能变流器的拓扑进行简要介绍,并针对GFM技术的控制特点为其选型;其次,对于现有的构网型控制策略进行总结分析;最后,提出当前研究难点以及发展过程中所面临的问题和挑战,为构网型控制技术今后的发展建设提供思路。
文摘柔性直流输电系统在交直流系统互联、大规模风光并网等方面具有较强的技术优势,随着高压大容量多端柔性直流输电系统的逐步应用和推广,现有调度主站的监控功能已不能满足其发展需求。文中详细分析了华北±500 k V/3000 MW四端环形柔性直流电网的拓扑结构和关键设备特性,面向半桥型模块化多电平换流器+直流断路器的组网方式,以换流站无人职守为目标,提出了基于主站调度控制系统的监视功能框架,给出了电网建模、信息采集、拓扑分析及智能告警等主要监视模块的功能方案,以支撑对高压大容量柔性直流电网的监视,为后期工程实施提供借鉴。
文摘The article has been retracted due to the investigation of complaints received against it. The Editorial Board found that substantial portions of the text quite like the one published in other journal. The problem is under investigation. This paper published in Vol.4 No.1, 2012, has been removed from this site temporally.
基金Project supported by the National Natural Science Foundation of China(Nos.51275040 and 50905017)the Programme of Introducing Talents of Discipline to Universities(No.B12022)
文摘Reliability and optimization are two key elements for structural design. The reliability~ based topology optimization （RBTO） is a powerful and promising methodology for finding the optimum topologies with the uncertainties being explicitly considered, typically manifested by the use of reliability constraints. Generally, a direct integration of reliability concept and topol- ogy optimization may lead to computational difficulties. In view of this fact, three methodologies have been presented in this study, including the double-loop approach （the performance measure approach, PMA） and the decoupled approaches （the so-called Hybrid method and the sequential optimization and reliability assessment, SORA）. For reliability analysis, the stochastic response surface method （SRSM） was applied, combining with the design of experiments generated by the sparse grid method, which has been proven as an effective and special discretization technique. The methodologies were investigated with three numerical examples considering the uncertainties including material properties and external loads. The optimal topologies obtained using the de- terministic, RBTOs were compared with one another; and useful conclusions regarding validity, accuracy and efficiency were drawn.
