This article studies the fault recorder in power system and introduces the Comtrade format. Andituses C++ programming to read recorded fault data and adopts Fourier analysis and symmetrical component method to filter ...This article studies the fault recorder in power system and introduces the Comtrade format. Andituses C++ programming to read recorded fault data and adopts Fourier analysis and symmetrical component method to filter and extract fundamental waves. Finally the effectiveness of the data processing method introduced in this paper is verified by CAAP software.展开更多
More and more high voltage direct current(HVDC) converters are being located in a load area in the Yangtze River Delta Region in China. It's large transmission capacity and intensive placement are hardly seen in o...More and more high voltage direct current(HVDC) converters are being located in a load area in the Yangtze River Delta Region in China. It's large transmission capacity and intensive placement are hardly seen in other countries. Accurate and reliable study tools and methods are extremely needed for power system engineers and researchers to deal with such problems which were never met before and otherwhere. A novel approach on electromagnetic modeling of alternating current / direct current(AC/DC) system is proposed and simulation is carried out to replay a real AC 3-phase to ground fault on a multi-infeed high voltage direct current(MIHVDC) system. AC system is specially simplified. Dynamic models and real parameters are adopted in main AC/DC equipments concerned and retained. Modeling and simulation are based on the power system computer aided design/electro-magnetic transient in direct current(PSCAD/EMTDC) system software package.Comparisons between simulation results and the records from the fault recorders are studied including both AC and DC quantities.展开更多
The Yishu fault zone （mid-segment of the Tanlu fault zone） was formed in the Presinian. Periodic tectonic activities and strong seismic events have occurred along the fault zone. During the initial stage of the Cale...The Yishu fault zone （mid-segment of the Tanlu fault zone） was formed in the Presinian. Periodic tectonic activities and strong seismic events have occurred along the fault zone. During the initial stage of the Caledonian Movement, with the proceeding of the marine transgression from the Yishu paleo-channel to the western Shandong, uneven thick sediments, composed mainly of sand, mud and carbonates of littoral, lagoon, and neritic facies, were deposited in the Yishu fault zone and western Shandong, and constructed the bottom part of the Lower Cambrian consisting of the Liguan and Zhushadong formations. Through field observations and the lab-examinations, various paleoseismic records have been discovered in the Liguan Formation and the Zhushadong Formations of the Yishu fault zone and its vicinity, including some layers with syn-sedimentary deformation structures that were triggered by strong earthquakes （i.e. seismite, seismo-olistostrome, and seismo-turbidite）. Paleoseismic records developed in the Zhushadong Formation are mainly seismites with soft-sediment deformation structures, such as liquefied diapir, small liquefied-carbonate lime-mud volcano, liquefied vein, liquefied breccia, convolute deformation （seismic fold）, graded fault, soft siliceous vein, and deformation stromatolite, as well as seismites with brittle deformation structures of semiconsolidated sediments. Paleoseismic records preserved in the Liguan Formation are not only seismo-olistostrome with a slump fold, load structure, and ball-and-pillows, but also seismo-turbidite with convolution bedding, graded bedding and wavy-bedding. However, in the western Shandong area, the closer to the Yishu fault zone, the greater the thickness of the Liguan Formation and the Zhushadong Formation, the greater the number and type of layers with paleoseismic records, and the higher the earthquake intensity reflected by associations of seismic records. This evidence indicates that tectonic taphrogenesis accompanied by strong earthquake events occurred in the Yishu fault zone during the initial stage of the Caledonian Movement, which embodied the break-up of the Sino-Korean Plate along the Paleo-Tanlu fault zone at that time.展开更多
It was shown from the study on the recently near-fault earthquake ground motions that the near-fault effects were seldom considered in the existing Chinese seismic code. Referring to the UBC97 design concept for near-...It was shown from the study on the recently near-fault earthquake ground motions that the near-fault effects were seldom considered in the existing Chinese seismic code. Referring to the UBC97 design concept for near-fault factors, based on the collected world-widely free-site records of near-fault earthquakes ground motions classified by earthquake magnitude and site condition, the attenuation relationship expressions of the acceleration spectrum demand at the key points within the long period and moderate period were established in term of the earthquake magnitude and the site condition. Furthermore, the near-fault factors＇ expressions about the earthquake magnitude and the fault distance were deduced for the area lack of near-fault strong earthquake records. Based on the current Chinese Building Seismic Design Code, the near-fault effect factors and the modified design spectral curves, which were valuable for the seismic design, were proposed to analyze the seismic response of structures.展开更多
换流阀是直流输电工程的核心设备,其价值约占换流站成套设备总价的22%~25%,其运行状态直接影响直流输电系统的可靠性。文章针对换流站阀区现有故障人工定位效率低、耗时长、严重依赖运行人员水平等问题,提出了基于度量学习和知识推理的...换流阀是直流输电工程的核心设备,其价值约占换流站成套设备总价的22%~25%,其运行状态直接影响直流输电系统的可靠性。文章针对换流站阀区现有故障人工定位效率低、耗时长、严重依赖运行人员水平等问题,提出了基于度量学习和知识推理的换流站阀区故障定位方法。文中基于PSCAD(power system computer aided design)仿真分析软件构建了阀区故障仿真模型,生成阀区典型故障录波数据,通过时频域变换获取前100根最大谱线;构建基于度量学习的数据降维网络,通过最大化类间距离、最小化类内距离实现录波电气量特征提取;形成电气量-开关量-故障类型三元组,以知识图谱形式存储故障定位知识,设计知识图谱推理算法实现基于录波数据分析的故障定位。实验结果表明,该方法基于换流站阀区录波数据实现故障定位检出率在92%以上,将有效提升运行人员故障定位效率。展开更多
针对故障录波大数据传输过程中的重要参数协议数据单元(protocol data unit,PDU)及传输层数据协议单元(transport protocol data unit,TPDU),提出应用长鼻浣熊算法(coati optimization algorithm,COA)优化技术的保信主子站通信方式。基...针对故障录波大数据传输过程中的重要参数协议数据单元(protocol data unit,PDU)及传输层数据协议单元(transport protocol data unit,TPDU),提出应用长鼻浣熊算法(coati optimization algorithm,COA)优化技术的保信主子站通信方式。基于保信系统网络架构及其PDU以及TPDU参数对网络流量的影响,建立考虑录波通信时长约束与瞬时流量约束的最大流量通信模型,同时引入COA算法进行参数优化,实现该背景下最优带宽配置。开展多类别变电站通信业务测试,并考虑极限情况下通信网络压力测试,所提方法能有效提升变电站信息传输能力以及可靠性。展开更多
文摘This article studies the fault recorder in power system and introduces the Comtrade format. Andituses C++ programming to read recorded fault data and adopts Fourier analysis and symmetrical component method to filter and extract fundamental waves. Finally the effectiveness of the data processing method introduced in this paper is verified by CAAP software.
文摘More and more high voltage direct current(HVDC) converters are being located in a load area in the Yangtze River Delta Region in China. It's large transmission capacity and intensive placement are hardly seen in other countries. Accurate and reliable study tools and methods are extremely needed for power system engineers and researchers to deal with such problems which were never met before and otherwhere. A novel approach on electromagnetic modeling of alternating current / direct current(AC/DC) system is proposed and simulation is carried out to replay a real AC 3-phase to ground fault on a multi-infeed high voltage direct current(MIHVDC) system. AC system is specially simplified. Dynamic models and real parameters are adopted in main AC/DC equipments concerned and retained. Modeling and simulation are based on the power system computer aided design/electro-magnetic transient in direct current(PSCAD/EMTDC) system software package.Comparisons between simulation results and the records from the fault recorders are studied including both AC and DC quantities.
基金supported by the National Natural Science Foundation of China(Grant No.:41272066)the Scientific Research Key Project of Shandong Province’s Geoscience Forum(LDXHLT-2007-10-001)the China Geological Survey Project(Grant No.:1212010510509)
文摘The Yishu fault zone （mid-segment of the Tanlu fault zone） was formed in the Presinian. Periodic tectonic activities and strong seismic events have occurred along the fault zone. During the initial stage of the Caledonian Movement, with the proceeding of the marine transgression from the Yishu paleo-channel to the western Shandong, uneven thick sediments, composed mainly of sand, mud and carbonates of littoral, lagoon, and neritic facies, were deposited in the Yishu fault zone and western Shandong, and constructed the bottom part of the Lower Cambrian consisting of the Liguan and Zhushadong formations. Through field observations and the lab-examinations, various paleoseismic records have been discovered in the Liguan Formation and the Zhushadong Formations of the Yishu fault zone and its vicinity, including some layers with syn-sedimentary deformation structures that were triggered by strong earthquakes （i.e. seismite, seismo-olistostrome, and seismo-turbidite）. Paleoseismic records developed in the Zhushadong Formation are mainly seismites with soft-sediment deformation structures, such as liquefied diapir, small liquefied-carbonate lime-mud volcano, liquefied vein, liquefied breccia, convolute deformation （seismic fold）, graded fault, soft siliceous vein, and deformation stromatolite, as well as seismites with brittle deformation structures of semiconsolidated sediments. Paleoseismic records preserved in the Liguan Formation are not only seismo-olistostrome with a slump fold, load structure, and ball-and-pillows, but also seismo-turbidite with convolution bedding, graded bedding and wavy-bedding. However, in the western Shandong area, the closer to the Yishu fault zone, the greater the thickness of the Liguan Formation and the Zhushadong Formation, the greater the number and type of layers with paleoseismic records, and the higher the earthquake intensity reflected by associations of seismic records. This evidence indicates that tectonic taphrogenesis accompanied by strong earthquake events occurred in the Yishu fault zone during the initial stage of the Caledonian Movement, which embodied the break-up of the Sino-Korean Plate along the Paleo-Tanlu fault zone at that time.
基金National Natural Science Foundation of China (50278002)Dalian Nationalities University Ph D Foundation (20066104)
文摘It was shown from the study on the recently near-fault earthquake ground motions that the near-fault effects were seldom considered in the existing Chinese seismic code. Referring to the UBC97 design concept for near-fault factors, based on the collected world-widely free-site records of near-fault earthquakes ground motions classified by earthquake magnitude and site condition, the attenuation relationship expressions of the acceleration spectrum demand at the key points within the long period and moderate period were established in term of the earthquake magnitude and the site condition. Furthermore, the near-fault factors＇ expressions about the earthquake magnitude and the fault distance were deduced for the area lack of near-fault strong earthquake records. Based on the current Chinese Building Seismic Design Code, the near-fault effect factors and the modified design spectral curves, which were valuable for the seismic design, were proposed to analyze the seismic response of structures.
文摘换流阀是直流输电工程的核心设备,其价值约占换流站成套设备总价的22%~25%,其运行状态直接影响直流输电系统的可靠性。文章针对换流站阀区现有故障人工定位效率低、耗时长、严重依赖运行人员水平等问题,提出了基于度量学习和知识推理的换流站阀区故障定位方法。文中基于PSCAD(power system computer aided design)仿真分析软件构建了阀区故障仿真模型,生成阀区典型故障录波数据,通过时频域变换获取前100根最大谱线;构建基于度量学习的数据降维网络,通过最大化类间距离、最小化类内距离实现录波电气量特征提取;形成电气量-开关量-故障类型三元组,以知识图谱形式存储故障定位知识,设计知识图谱推理算法实现基于录波数据分析的故障定位。实验结果表明,该方法基于换流站阀区录波数据实现故障定位检出率在92%以上,将有效提升运行人员故障定位效率。
文摘针对故障录波大数据传输过程中的重要参数协议数据单元(protocol data unit,PDU)及传输层数据协议单元(transport protocol data unit,TPDU),提出应用长鼻浣熊算法(coati optimization algorithm,COA)优化技术的保信主子站通信方式。基于保信系统网络架构及其PDU以及TPDU参数对网络流量的影响,建立考虑录波通信时长约束与瞬时流量约束的最大流量通信模型,同时引入COA算法进行参数优化,实现该背景下最优带宽配置。开展多类别变电站通信业务测试,并考虑极限情况下通信网络压力测试,所提方法能有效提升变电站信息传输能力以及可靠性。
