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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 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.

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.

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.

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