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Liu Y.,Nanjing SAC Power Grid Automation Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

Plug and play of the smart substation's life cycle is the main line, which includes three stages, i.e. the design, construction and operation. It introduces the method of virtual terminator auto-mapping and network architecture of distributed local protection in the design stage, refers the precast cabin of the new material and the innovation of standard precast optical cable in the construction stage, and studies the advanced application of panoramic simulation closed loop test, no-setting protection of auto-identification system of and smart tripping, etc. in the operation stage. Last it forecasts the future trend of the smart substation combined with its application. © 2015, Power System Protection and Control Press. All right reserved. Source


Bei D.,Nanjing SAC Power Grid Automation Co. | Xiang Z.,Nanjing SAC Power Grid Automation Co. | Shi C.,Nanjing SAC Power Grid Automation Co. | Shizhen S.,Nanjing SAC Power Grid Automation Co. | And 2 more authors.
POWERCON 2014 - 2014 International Conference on Power System Technology: Towards Green, Efficient and Smart Power System, Proceedings | Year: 2014

This paper use the platform technology to present a scheme of a full-featured relay protection devices simulation system, using the program as same as in the actual device, ensured the simulation result is exactly same as actual device, then according to this design, developed a digital simulation system. Depend on this platform, we can study the protection algorithm or perform the source code level debugging, simulation devices can exchange data with a simulation software like PSCAD and a server via protocol 61850 at the same time. It can monitor the fault, analysis the protection action behavior and upload the data to backend server, Develop protection devices by using this platform technology will greatly improve the development efficiency and shorten the development cycle, reduce the development investment and costs, at the same time, the system is suitable for off-line training and simulation test for all power system users. © 2014 IEEE. Source


Zhou X.,Nanjing SAC Power Grid Automation Co. | Wang S.,Nanjing SAC Power Grid Automation Co. | Wu Z.,Jiangsu Electric Power Company | Tang Z.,Nanjing SAC Power Grid Automation Co. | And 2 more authors.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2015

According to the requirement of the protection equipment's local placing in the hierarchical relay protection control system and because of the problems, such as large power supply, complex link, etc., the centralized busbar protection cannot be directly placed locally. This paper puts forward a distributed busbar protection locally placing implementation scheme based on HSR ring network. In this scheme, at each interval it locally places the corresponding independent submachine to get the interval's sampling value and digital data. Using dual redundant HSR ring network to interconnect each submachine and share each data, each submachine owns whole busbar protection function and judges independently. The new interpolation synchronization technology makes the busbar protection not rely on the external clock, at the moment the bypass technology designed can reduce the complexity of operation. This busbar protection model machine has been successfully passed the professional institute's test and trial work in the substation, which verify the feasibility of this scheme. ©, 2015, Power System Protection and Control Press. All right reserved. Source


Zhang B.,Zhejiang University | Chen F.,Guodian Nanjing Automation Co. | Chen F.,Nanjing SAC Power Grid Automation Co. | Wang Y.,Guodian Nanjing Automation Co. | And 4 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2013

Distribution characteristics of zero-sequence current when parallel transmission lines grounding fault happens, the impact of zero-sequence mutual inductance on phase-earth distance protection, the setting method of zero-sequence compensation coefficient (K values) in grounding distance protection, and the impact of different K value setting schemes on protecting range of action are analyzed. With the simulation analysis of ultra-high voltage (UHV) 1000 kV Anhui-to-east power transfer parallel transmission lines, change trajectories of fault calculating impedance under different working conditions along the line, the setting reference values and protecting action range of zone I distance with different zero-sequence compensation coefficients are given. Finally, combining with the engineering practice, and considering the setting convenience and the protection sensitivity and safety, referential setting schemes for distance protection related constant values are proposed. ©2013 State Grid Electric Power Research Institute Press. Source


Zhang X.-J.,Nanjing SAC Power Grid Automation Co. | Liu Y.,Nanjing SAC Power Grid Automation Co. | Yu H.-W.,Nanjing SAC Power Grid Automation Co. | Chen X.-Z.,Nanjing SAC Power Grid Automation Co.
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2014

Smart substation GOOSE, SV, MMS three-in-one network achieves full information sharing, the double star network reliability is high, the corresponding power device needs to support efficient and robust redundancy discarding algorithm. According to the PRP recommended double window drop algorithm is complex, disordered packet has low efficiency, timing considerations are not rigorous, restarting exception handling is not included, this paper summarizes the basic needs of discard algorithm, analyzes reliable discarded and safe receiving timing principle, proposes the sequence number state HASH algorithm and a single fixed sliding window method. A detailed analysis of the starting and ending points are or not in the sliding window, the receiving sequence number before or in or after the window situations, and gives the algorithm pseudo code for reference use. Robustness that exceeds specific interval, for the same sequence number, the content of the packet may not be the same; within specific interval, different packets may have the same FCS (frame check sequence). This method can assert and discard received duplicate packet quickly and accurately, which lays a solid basis for the power device of smart substation to realize PRP/HSR algorithm. ©, 2014, Power System Protection and Control Press. All right reserved. Source

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