Tong C.,China Institute of Technology |
Chi R.,Suzhou Electrical Power Company |
Yu C.,Suzhou Electrical Power Company |
Wang N.,Suzhou Electrical Power Company
2011 7th Asia-Pacific International Conference on Lightning, APL2011 | Year: 2011
For the purpose of improving the stability and robustness of Smart Grid, a dynamic lightning protection mode which based on real time lightning detection was developed. While the conventional mode focuses on the protection for each individual grid element or component (transmission line, distribution line, transformer, substation, electronic equipment, etc) separately, the dynamic mode that named Active Lightning Protection (ALP) concentrates on protecting the whole electrical grid in its entirety. According the real time lightning detection information, the ALP mode carries out dynamic measures in advance, including adjusting the grid operation mode, optimizing the gird power flow distribution, controlling the generation units, switching the Microgrid. Furthermore, it leads the load to those parts of smart grid which are not threatened by lightning, so as to reduce the risk of grid-scale blackout. The dynamic protection mode, which discussed in the paper, provides more optional applications of lightning detection in the Smart Gird. © 2011 IEEE.
Qiu S.,Suzhou Electrical Power Company |
Zhang Y.,Shanghai JiaoTong University |
Jiang W.-Y.,Suzhou Electrical Power Company
Gaoya Dianqi/High Voltage Apparatus | Year: 2011
The 3AQ type circuit-breakers are widely used in electric power system. However, nitrogen leakage signal is the most frequent fault signal for this type of circuit-breaker due to its hydraulic operating mechanism. In order to enhance power supply reliability, this paper analyzes both electric location and physical location of the fault, and gives the treatment methods for the two aspects. The treatment methods are verified by three practical fault diagnoses.
Yuan Y.,Hohai University |
Zhang X.,Hohai University |
Ju P.,Hohai University |
Qian K.,Suzhou Electrical Power Company |
Fu Z.,Hohai University
Electric Power Systems Research | Year: 2012
In this paper, a dual battery energy storage system (BESS) scheme is adopted to compensate power mismatch between wind power and desired power schedule for dispatching wind power on an hourly basis. The two BESSs are utilized to cope with the positive and negative power mismatch respectively, and the roles of them can be interchanged according to the predefined thresholds on state of charge (SOC). Three hourly indices, entitled as expected wind power curtailment (EWPC), expected wind power deficiency (EWPD) and probability of wind power deficiency (PWPD) respectively, are proposed to evaluate the performance on wind power dispatchability provided by the BESS. Sequential Monte Carlo simulation (SMCS) is utilized to compute the three hourly indices. Finally, simulation results on a real Chinese costal wind farm justify the feasibility of the methodology proposed in this paper. © 2012 Elsevier B.V. All rights reserved.
Wang Y.,NARI Group |
Zhang G.,Jiangsu Electric Power Company |
Zhao J.,Suzhou Electrical Power Company |
Jiang Y.,Jiangsu Electric Power Company |
Tang B.,NARI Group
Dianli Zidonghua Shebei/Electric Power Automation Equipment | Year: 2011
A distributed computational model combination algorithm is presented for large-scale system union. The sub-net chooses the main-net for local computational model combination and power flow calculation and writes the calculated results back to the local devices. A multi-mode DTS (Dispatcher Training Simulator) system union is established according to the characteristics of regional power grid, which integrates the computational model combination mode with the boundary flow matching mode. Different union modes are selected during power system combination. The multi-mode DTS system union ensures the accuracy of combined network power flow and avoids large-scale combination calculation. It is adopted in Jiangsu provincial-regional associated anti-failure maneuver, showing satisfactory results.
Li Y.-L.,Zhejiang University |
Jiang D.-Z.,Zhejiang University |
Yu H.-R.,Suzhou Electrical Power Company
Dianli Xitong Baohu yu Kongzhi/Power System Protection and Control | Year: 2011
Automation equipment and monitoring system in power system are increasingly complex, and providing synchronous clock of a sufficiency of accuracy for power system becomes the key factor of improving equipment operation stability and monitoring system accuracy. A synchronous backup clock circuit is designed based on GPS/Beidou system dual-timing source, and it can follow the dual -timing source clock signal effectively. A kind of high stability crystal local clock structure is designed based on the satellite clock signal and backup clock signal as well as the time interval measurement technology, and it can maintain a high accuracy within a certain time. On this basis, a timing scheme for power system based on multi-timing source and multi-mode of timing is put forward, and it can select the appropriate timing mode depending on the different timing facilities which need timing, and it improves the stability, reliability, and economy of the timing in power system.
Zhuang W.J.,China Electric Power Research Institute |
Zhu H.B.,Jiangsu Electric Power Company |
Zhao J.Q.,Suzhou Electrical Power Company |
Zhang Y.G.,China Electric Power Research Institute |
Sun M.Y.,China Electric Power Research Institute
Advanced Materials Research | Year: 2014
This paper proposes the construction mode of a two-level distributed alarming system, in which alarms are coordinately processed by substations and control center. In substation side, we classify alarms into several grades according to the degree of their importance and send the extracted key alarms to control center, thus reduce the amount of alarm passing and ensure the transmission reliability and speed; meanwhile, we carry out alarm verification and pretreatment through information redundancy to validate alarm correctness. In control center side, we integrate the data of ordinary Supervisory Control and Data Acquisition (SCADA) and the alarms received directly from substations, and carry out comprehensive fault reasoning and correctness verification. In order to illustrate the feasibility of the substation-control center distributed alarming system, the overall structure, substation smart alarm (SSA), control center smart alarm (CCSA) and cooked data transmission of this construction mode will be discussed in detail. © (2014) Trans Tech Publications, Switzerland.
Li J.,Beijing University of Technology |
Chen C.,Suzhou Electrical Power Company |
Jiao S.,Beijing Sifang Automation Co
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010
An open common graphical feeder automation fault processing control logic scheme is proposed based on the process automation theory and realized by IEC 61131-3 standard. The logic models and technical features of fault location, insulation and recovery (FLIR) are discussed. A series of function block diagram (FBD) models for fault processing are developed by the structured text (ST) language. The correctness of the logic functions is verified by simulation and laboratory tests that also show that the feeder fault processing method proposed is open, smart, reliable and practical. © 2010 State Grid Electric Power Research Institute Press.
Zhao J.Q.,China Electric Power Research Institute |
Zhuang W.J.,Suzhou Electrical Power Company |
Sun M.Y.,Suzhou Electrical Power Company |
Zhang Y.G.,Suzhou Electrical Power Company
Applied Mechanics and Materials | Year: 2014
To solve problems like slow computing speed and system operation speed, low system stability and reliability, which were encountered at implementing traditional region-county integration dispatching automation system(DAS) in a large scale region-county dispatching system, this paper provides a new type construction mode of region-county integration system, i.e. distributed and autonomous disaster tolerance backup system. It redesigns the structure of region-county integration system from aspects of network structure, model integration, data integration, application integration, separated operation and remote backup, provides wide area remote interconnection of region DAS with county DAS distributed at each county to make them become one logical set of system and realize share of data, technologies and equipment sources, save cost of system maintenance and construction, improve the reliability of DAS, realize remote disaster tolerance and backup and improve region-county operators' professional ability and technological level. © (2014) Trans Tech Publications, Switzerland.