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Wang G.,Tongji University | Hu Z.-F.,Tongji University | He D.-H.,Tongji University | Wu X.-M.,Shenyang Northeast Electrical Power Research Institute
Cailiao Rechuli Xuebao/Transactions of Materials and Heat Treatment

12%Cr martensitic heat-resistant steels are favored for high temperature applications in power plants and other industries. The severe service conditions of elevated temperature and high pressure for long-term lead to degradation in the microstructure and properties, so new theories or models are expected to give much a reliable life assessment under real service condition. A series of superheater tube samples for various service periods had been carefully investigated. The value of hardness decreases obviously with life depletion, and corresponding microstructure show carbide coarsening, microstructure recovery, and other damage characteristics. The morphology and distribution and composition of main precipitates M23C6 varied distinctly. The study of carbide composition evolution shows the most regular trend is the Cr enrichment in M23C6. The Cr/Fe ratio in coarsening particles shows a clear dynamical growth law, a power correlation with service time. ©, 2014, Editorial Office of Transactions of Materials and Heat Treatment. All right reserved. Source

Geng B.,Shenyang Northeast Electrical Power Research Institute | Wang Z.,Liaoning Electrical Power Company Ltd | Ge W.,Liaoning Electrical Power Company Ltd | Wang C.,Liaoning Electrical Power Company Ltd | And 3 more authors.
2012 IEEE Innovative Smart Grid Technologies - Asia, ISGT Asia 2012

This paper discussed the application of online monitoring system based on IEC61850 standard in the smart substation. Firstly, the functions and performance requirements of online monitoring system have been discussed, and the functional model and interface model of online monitoring based on IEC61850 have been established; Secondly, the application schema of online monitoring system has been designed for smart substation. Furthermore, according to the practical application in the pilot project, the validity of the models and the schema has been verified, and a summary of the application has been given. © 2012 IEEE. Source

Zhang W.,Shenyang Ligong University | Gao Q.,Shenyang Northeast Electrical Power Research Institute | Gao Q.,Shanghai JiaoTong University | Cheng D.,Shenyang Northeast Electrical Power Research Institute | Li H.,Chaoyang Power Supply Bureau
Dianli Xitong Zidonghua/Automation of Electric Power Systems

In smart substation, it is an important topic that how to send device status data to the monitoring center securely, reliably and cost-effectively through wireless sensitive network (WSN). At first, it is found through experiment that several shortcomings of WSN communication link such as high loss rate, obvious asymmetry, etc. Then a RETX route metric algorithm based on link quality and containing received signal strength indication (RSSI) value and expected transmission count (ETX) is proposed. The RSSI value is calculated through an algorithm of forward link and reverse link, and furthermore the minimum energy needed for success sending a packet is also calculated. By using this algorithm to online monitor system of smart substation, the network duration of service may be extended, which offers valuable reference to the application of WSN in intelligent online monitoring system for smart substations. © 2012 State Grid Electric Power Research Institute Press. Source

Xing Z.,Shenyang Northeast Electrical Power Research Institute | Chen L.,Shenyang University of Technology | Xue L.,Shenyang University of Technology | Zhang Y.,Shenyang Northeast Electrical Power Research Institute
Advanced Materials Research

In order to maintain the stable operation of grid system, the grid company requires wind turbine generator system with low-voltage ride through (LVRT) capability. With this issue, the article builds a double-fed wind turbine generator system model, Crowbar circuit strategy model to protect rotor-side inverter and fault pitch control strategy model to inhibition rotor speed during grid fault. Then all the models and strategies are verified by the simulation of grid low voltage. The simulation results show that these models can complete LVRT. © (2012) Trans Tech Publications, Switzerland. Source

Zhao T.,Tsinghua University | Zou X.,Tsinghua University | Wang X.,Tsinghua University | Zhao Y.,Liaoning Shenyang Power Supply Company | And 3 more authors.
IEEE Transactions on Plasma Science

Abstract-A pulsed-power generator (PPG-I) with a current of 400 kA in amplitude and 100 ns in pulsewidth was constructed. The development of X-pinches and the early stages of wirearray Z-pinches were investigated by X-ray backlighting using the X-pinch driven by PPG-I as X-ray source. The plasma explosion and implosion near the cross point of the X-shape wires can be clearly seen from a series of backlighting images taken at different times of X-pinch discharge. To study the early behavior of the plasma in wire-array Z-pinches, anX-pinch installed in the place of a current-return rod was used as the X-ray source to backlight a wire-array Z-pinch installed in the center between the anode and the cathode. The plasma formation, the interwire plasma merging, and the instabilities were also clearly observed, which can provide a better understanding of the physics of Z-pinches and the basic experimental data to validate simulation models. © 2010 IEEE. Source

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