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Nanjing, China

Shen G.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

In order to build up intelligent power dispatching of bulk power grid, integration of secondary system in power control center and substations needs standardized and modular secondary system construction which results in information interaction more flexible. Implementation of secondary system integration is with multi-specialty technology merging. Some key technologies including grid fundamental data enhancement, application support platform, and advanced power analysis software (PAS) for intelligent power dispatching of bulk power grid are studied. In respect of building grid fundamental data, SCADA supporting system with united time stamped measurements is designed. In respect of support platform, general solution scheme of integrated application support platform is proposed. In respect of new PAS, fast status estimation based on time stamped measurements, on-line self-adaptive defense lines, real-time pre-warning and pre-control system are put forward. © 2012 State Grid Electric Power Research Institute Press. Source

Wang W.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2012

The necessity of building an integrated smart power network dispatching automation system is proposed. In addition, the necessity of integrated data communication between dispatching center and substation is presented, and the analysis on the problems of IEC 61970 and IEC 61850 data model, substation's diagram, telecontrol protocol, maintenance in the substation, subscribing/publish is also presented. The basic principles, the modeling method and communication service of telecontrol protocol based on IEC 61850 are proposed. On the basis of IEC 61850, the rule of model change between IEC 61850 and IEC 61970, realization method of maintenance in substation and subscribing/publish are put forward. © 2012 State Grid Electric Power Research Institute Press. Source

Gu J.,NARI Group
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2014

The promulgation of Tentative Standard on Practicality of Energy Management System (EMS) and Interim Procedures for Practical Acceptance of Energy Management System (EMS) is beneficial to the practicality of EMS and improvement on the security and economy of power grid operation. The state estimation (SE) is a fundamental function in EMS, and the values obtained through SE are also the fundamental data for analysis of other power grids and control functions. Some opinions differ from those as worded in the above two standards are discussed at the academic and technical level. © 2014 State Grid Electric Power Research Institute Press. Source

Li G.,NARI Group
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2013

The extensive application of GOOSE and sample data transmission in digital substations requires the high performance of communication networks. Traditional shared multicast communication mode is not suitable for digital substations because it may aggravate the network conflict and increase the receiving error. VLAN partition technology supporting IEEE802.1Q and GMRP networking technology are discussed and it is pointed out that both, the former together with the isolated broadcast domain method and the latter with the dynamic multicast registered technology, can be used in theory to avoid the overloaded multicast flow of digital substation transmission, while the latter is better because of its simple project implementation & maintenance and precise flow control. Source

Zhang Y.,Shanghai JiaoTong University | Tai N.,Shanghai JiaoTong University | Xu B.,NARI Group
IEEE Transactions on Power Delivery | Year: 2012

Explicit fault analysis is the basis of protection for the bipolar HVDC Line. The characteristics of the initial values of traveling waves under various internal fault conditions are investigated on the basis of the symmetrical component analysis. The criteria of fault classification and faulty-pole selection are put forward based on the zero- and positive-sequence backward traveling waves, and an integrated traveling wave-based protection scheme is proposed. The simulations based on real-time digital simulation show that the proposed scheme can detect faults rapidly, determine the fault type effectively, and select the faulty pole correctly. © 2012 IEEE. Source

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