随着柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术的应用与发展,对柔直阀控系统的可靠性测试要求不断提高,现有测试系统无法同时满足阀控系统全规模接入、全功能测试、精准建模的需求。针...随着柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术的应用与发展,对柔直阀控系统的可靠性测试要求不断提高,现有测试系统无法同时满足阀控系统全规模接入、全功能测试、精准建模的需求。针对已有测试系统的不足,基于RTLAB平台进行精准建模,并设计高性能、灵活配置的接口装置,搭建了阀控全接入测试系统,提出了阀控系统关键测试项目及测试方法。该测试系统及测试方法已应用于张北柔性直流输电工程北京换流站阀控系统的出厂测试中,通过测试的阀控系统在工程现场运行稳定可靠。展开更多
提出了一种基于SD卡启动方式的PowerPC NOR Flash自动烧写的方法,该方法通过SD卡启动,读取存储在SD卡中的NORFlash烧写镜像,实现将烧写镜像自动烧写到Flash芯片中。该方法省去了以往嵌入式PowerPC Flash芯片首次烧写uboot必需的专用烧...提出了一种基于SD卡启动方式的PowerPC NOR Flash自动烧写的方法,该方法通过SD卡启动,读取存储在SD卡中的NORFlash烧写镜像,实现将烧写镜像自动烧写到Flash芯片中。该方法省去了以往嵌入式PowerPC Flash芯片首次烧写uboot必需的专用烧写器。实际工程应用及测试结果表明,该方法运行稳定可靠,可大幅度提高生产烧写效率,具有较高的工程应用价值。展开更多
Peer-to-peer(P2P)transactive energy trading offers a promising solution for facilitating the efficient and secure operation of a distribution system consisting of multiple prosumers.One critical but challenging task i...Peer-to-peer(P2P)transactive energy trading offers a promising solution for facilitating the efficient and secure operation of a distribution system consisting of multiple prosumers.One critical but challenging task is how to avoid system network constraints to be violated for the distribution system integrated with extensive P2P transactive energy trades.This paper proposes a security constrained decentralized P2P transactive energy trading framework,which allows direct energy trades among neighboring prosumers in the distribution system with enhanced system efficiency and security in which no conventional intermediary is required.The P2P transactive energy trading problem is formulated based on the Nash Bargaining theory and decomposed into two subproblems,i.e.,an OPF problem(P1)and a payment bargaining problem(P2).A distributed optimization method based on the alternating direction method of multiplier(ADMM)is adopted as a privacy-preserving solution to the formulated security constrained P2P transactive energy trading model with ensured accuracy.Extensive case studies based on a modified 33-bus distribution system are presented to validate the effectiveness of the proposed security constrained decentralized P2P transactive energy trading framework in terms of efficiency improvement,loss reduction,and voltage security enhancement.展开更多
Smart buildings have been proven to be a kind of flexible demand response resources in the power system.To maximize the utilization of the demand response resources,such as the heating,ventilating and air-conditioning...Smart buildings have been proven to be a kind of flexible demand response resources in the power system.To maximize the utilization of the demand response resources,such as the heating,ventilating and air-conditioning(HVAC),the energy storage systems(ESSs),the plug-in electric vehicles(PEVs),and the photovoltaic systems(PVs),their controlling,operation and information communication technologies have been widely studied.Involving human behaviors and cyber space,a traditional power system evolves into a cyberphysical-social system(CPSS).Lots of new operation frameworks,controlling methods and potential resources integration techniques will be introduced.Conversely,these new techniques urge the reforming requirement of the techniques on the modeling,structure,and integration techniques of smart buildings.In this paper,a brief comprehensive survey of the modeling,controlling,and operation of smart buildings is provided.Besides,a novel CPSS-based smart building operation structure is proposed,and the integration techniques for the group of smart buildings are discussed.Moreover,available busi-ness models for aggregating the smart buildings are discussed.Furthermore,the required advanced technologies for well-developed smart buildings are outlined.展开更多
In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly...In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly different shape. In addition, the illusion optical devices can work in a broadband of frequencies.展开更多
We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device i...We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device is perfectly transparent, which stems from the special conformal mapping and the refractive- index profile of the Mikaelian lens.展开更多
文摘随着柔性直流输电(voltage source converter based high voltage direct current,VSC-HVDC)技术的应用与发展,对柔直阀控系统的可靠性测试要求不断提高,现有测试系统无法同时满足阀控系统全规模接入、全功能测试、精准建模的需求。针对已有测试系统的不足,基于RTLAB平台进行精准建模,并设计高性能、灵活配置的接口装置,搭建了阀控全接入测试系统,提出了阀控系统关键测试项目及测试方法。该测试系统及测试方法已应用于张北柔性直流输电工程北京换流站阀控系统的出厂测试中,通过测试的阀控系统在工程现场运行稳定可靠。
文摘提出了一种基于SD卡启动方式的PowerPC NOR Flash自动烧写的方法,该方法通过SD卡启动,读取存储在SD卡中的NORFlash烧写镜像,实现将烧写镜像自动烧写到Flash芯片中。该方法省去了以往嵌入式PowerPC Flash芯片首次烧写uboot必需的专用烧写器。实际工程应用及测试结果表明,该方法运行稳定可靠,可大幅度提高生产烧写效率,具有较高的工程应用价值。
基金This work was supported in part by Shanghai Science and Technology Plan:Research and application for key technologies of public building virtual power plant based on distributed resource aggregation control,China(No.20dz1206200).
文摘Peer-to-peer(P2P)transactive energy trading offers a promising solution for facilitating the efficient and secure operation of a distribution system consisting of multiple prosumers.One critical but challenging task is how to avoid system network constraints to be violated for the distribution system integrated with extensive P2P transactive energy trades.This paper proposes a security constrained decentralized P2P transactive energy trading framework,which allows direct energy trades among neighboring prosumers in the distribution system with enhanced system efficiency and security in which no conventional intermediary is required.The P2P transactive energy trading problem is formulated based on the Nash Bargaining theory and decomposed into two subproblems,i.e.,an OPF problem(P1)and a payment bargaining problem(P2).A distributed optimization method based on the alternating direction method of multiplier(ADMM)is adopted as a privacy-preserving solution to the formulated security constrained P2P transactive energy trading model with ensured accuracy.Extensive case studies based on a modified 33-bus distribution system are presented to validate the effectiveness of the proposed security constrained decentralized P2P transactive energy trading framework in terms of efficiency improvement,loss reduction,and voltage security enhancement.
基金supported by the Shanghai Science and Technology Plan Funded Project(20dz1206200)the National Natural Science Foundation of China(Grant No.51907120)Shanghai Sailing Program(19YF1423600).
文摘Smart buildings have been proven to be a kind of flexible demand response resources in the power system.To maximize the utilization of the demand response resources,such as the heating,ventilating and air-conditioning(HVAC),the energy storage systems(ESSs),the plug-in electric vehicles(PEVs),and the photovoltaic systems(PVs),their controlling,operation and information communication technologies have been widely studied.Involving human behaviors and cyber space,a traditional power system evolves into a cyberphysical-social system(CPSS).Lots of new operation frameworks,controlling methods and potential resources integration techniques will be introduced.Conversely,these new techniques urge the reforming requirement of the techniques on the modeling,structure,and integration techniques of smart buildings.In this paper,a brief comprehensive survey of the modeling,controlling,and operation of smart buildings is provided.Besides,a novel CPSS-based smart building operation structure is proposed,and the integration techniques for the group of smart buildings are discussed.Moreover,available busi-ness models for aggregating the smart buildings are discussed.Furthermore,the required advanced technologies for well-developed smart buildings are outlined.
基金Acknowledgements This work was supported by the National Science Foundation of China for Excellent Young Scientists （Grant No. 61322504）, the Foundation for the Author of National Excellent Doctoral Dissertation of China （Grant No. 201217）, and the Priority Academic Program Development （PAPD） of Jiangsu Higher Education Institutions.
文摘In this paper, we propose a simple method of illusion optics based on conformal mappings. By carefully developing designs with specific conformal mappings, one can make an object look like another with a significantly different shape. In addition, the illusion optical devices can work in a broadband of frequencies.
基金This work was supported by the National Natural Science Foundation of China for Excellent Young Scientists （Grant No. 61322504）, the Foundation for the Author of National Excellent Doctoral Dissertation of China （Grant No. 201217）, andFundamental Research Funds for the Central Universities （Grant No. 20720170015）.
文摘We perform a semi-analytical calculation of the field distributions of a conformal invisible device via mode expansions. For a discrete set of frequencies in the regime of wave optics, the conformal invisible device is perfectly transparent, which stems from the special conformal mapping and the refractive- index profile of the Mikaelian lens.
