The high voltage and large capacity VSC-HVDC grid project has significant difference in valve hall air gap and space layout from the previous one due to its installation of DC circuit breakers. According to the characteristics of high voltage and large capacity VSC-HVDC system, a study is made on the air clearance calculation and compacting layout design of valve hall. The g-parameter method is used to correct the discharge characteristics of air gap under non-standard meteorological conditions, and a method is given for obtaining the temperature and humidity of the valve hall at the maximum air clearance; a method is proposed for compacting layout design of high voltage and large capacity valve hall with DC circuit breakers. Taking Zhangbei converter station of Zhangbei ±500 kV VSC-HVDC demonstration project as an example, the temperature and humidity conditions for calculating air clearance of valve hall were corrected, and the air clearance values were obtained. A comparative analysis of the valve hall layout schemes show that under the condition for meeting the requirements of air clearance and maintenance space, the proposed compacting design method can significantly reduce the valve hall size.

近年来,配电网从当前形态向未来高级形态加速发展.在此趋势下,提出了基于柔性变电站的交直流配电网技术路线.该技术路线在科学研究、方案设计、设备制造和工程建设等方面都是首次开展,尚无成熟的设计经验及完备的理论体系支撑.该文首次系统给出了基于柔性变电站的交直流配电网的成套设计体系框架和方法流程,在系统方案、设备参数设计和控制保护等方面开展了深入的研究和论述.该文的研究成果已在首个基于柔性变电站的交直流电网示范工程成套设计中应用,并将为交直流配电网的推广应用提供理论支撑和方法指导.

当前,人工智能技术正加速在各行业深度融合和落地应用,推动社会、经济各领域从数字化、网络化向智能化加速飞跃.在人工智能的加持下,加速输变电工程设计智能化转型,能够极大地提高设计效率和设计质量,乃至改变工程设计方式. 输变电工程设计发展现状 输变电工程设计包括输电线路设计和变电站设计,其中输电线路设计包括输电线路的选择,线路起讫点位置、输电容量、回路数、导线截面等.变电站的设计包括变电站的选择和电气设备及其主接线方案的选择等.

顺应能源转型和电网发展的趋势,国家电网有限公司确立了“三型两网、世界一流”的目标要求,设计队伍作为两网建设的排头兵,需要拥有敏锐的全局视野、先进的管理经验、蓬勃的经营理念、高效的体系制度、深厚的业绩积累、雄厚的技术累积和出众的人才队伍,与时俱进,提升设计能力,是支撑一流能源互联网企业建设的必要工作.

国家电网有限公司2019年1号文件提出推动电网与互联网深度融合,着力构建能源互联网,并于2019年3月8日做出全面建设泛在电力物联网的战略部署.微网作为能源互联网的“有机细胞”,是能源互联网中能源流的主要载体;泛在电力物联网属于能源互联网的重要组成部分,是能源互联网中数据流的主要载体.在新形势下,如何借助泛在电力物联网的建设,实现微网的新发展,实现能源流和数据流的双向流通,对于支撑“公司、区域、园区”三级智慧能源服务体系建设具有重要的战略意义.

随着柔性直流技术的发展,配电网领域源-网-荷的构建方式更加丰富,可实现集中式光伏直流并网、数据中心直流供电等新型电网模式.依托张北交直流配电网及柔性变电站示范工程,介绍光伏发电站直流并网方案以及工程实施途径,同时,设计了数据中心直流供电的接线方式,计算了供电可靠性.在此基础上,对比直流配电网和传统交流配电网,从电能传输效率、供电可靠性、电能质量等方面体现了直流配电网的优势.示范工程实现了光伏发电直流接入与消纳,设计成果和实践经验可为同类工程提供参考.

In recent years,the traditional AC distribution network is facing the challenge of more and more DC power sources,DC loads and the diversification of power demand. AC and DC distribution network has gradually become the focus of research. This paper reviews the current situation of domestic and foreign technologies for AC and DC distribution network and summarizes the characteristics of existing schemes. Aiming at the core challenge to distribution network,a new technology on AC and DC distribution network based on flexible substation is proposed. Flexible substation makes the power electronic equipment highly integrated with AC and DC multi-type interfaces, and can control the power flow, highly supports the utilization of new energy and individuation of electricity consumption scheme,can support the flexible operation of grid,the demand of new energy power supply and multiple loads etc. The paper builds the system model, makes the power calculation,designs automation system,strategy of control and protection. Simulation results verify the correctness of the principle and the feasibility of the project;verify that this project can improve the interactivity and coordination of source-network-load. Finally,this paper takes "Zhangbei AC and DC distribution network and flexible substation demonstration project" as an example to introduce the world's first AC and DC distribution network based on flexible substation,and sums up the demonstration significance of the AC and DC distribution network's development.

为提高新一代智能变电站变电设备状态监测与评估的准确性和效率,文章研究了针对变电设备状态监测与评估的数据监测体系和手段,指出目前在线监测设备的大量应用可为大数据挖掘分析提供强有力的数据支撑,并分析了适用于新一代智能变电站变电设备状态监测与评估的大数据预处理方法,最后从建立设备异常知识库和状态评估2个方面展望了大数据在新一代智能变电站变电设备状态监测与评估领域的应用前景.