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Gu Y.J.,North China Electrical Power University | Xu J.,North China Electrical Power University | He X.,China Power Investment Corporation
Applied Mechanics and Materials | Year: 2014

It is of great significance to adopt the reasonable scheme to repair the abrasive shaft in order to make sure the safety and stable operation of the steam turbine unit. Taking a real 600MW steam turbine generator unit with worn shaft as the target system, we employ finite element software ANSYS to establish the model of the local worn shaft segment in this paper. Two kinds of optimized processing strategies are proposed to repair the worn shaft segment, considering the situation of cutting quantity and shear stress distribution. The two proposed schemes can reduce the stress concentration of the worn shaft parts largely. The study proves that the method is feasible and can be used to processing other similar failures. © (2014) Trans Tech Publications, Switzerland. Source

Chi Y.-Y.,Changchun University of Technology | Wang Y.-L.,State Grid Electric Power Research Institute of China | Niu D.-X.,North China Electrical Power University | Li X.-Y.,China Power Investment Corporation
Dianwang Jishu/Power System Technology | Year: 2010

The generating right exchanging optimization model under carbon emission trading was constructed based on the low-carbon economy, and the profit distribution model was also presented. By comparing with the case without consideration of carbon trading, it was found that the case with consideration of carbon trading can significantly improve the exchanging efficiency, and enhance the initiative of generators to participate in the exchange. Source

Deng A.,University of Adelaide | Zhang M.,China Power Investment Corporation
GA 2012 - 5th Asian Regional Conference on Geosynthetics: Geosynthetics for Sustainable Adaptation to Climate Change | Year: 2012

A consolidation model was established for vacuum preloading-electroosmosis combined single prefabricated vertical drain (PVD), which is used to consolidatelow-permeable soil mass. The model was derived in terms of "equalstrain hypothesis" and one-dimensional electroosmosis consolidation theory. The analytical solutions to the model are able to predict the primary consolidation of soil, including pore pressure, consolidation degree as well as water discharge volume. A laboratory apparatus was set up to examine the consolidation of kaolin which was subjected to the combined consolidation process. The test resultswere compared against analytical results to verify the predictability of the consolidation model. It is indicated that vacuum preloading-electroosmosis combined processis able to facilitate the consolidation of the kaolin and the analytical results are in good agreement with test results. Source

Cui Z.,China Power Investment Corporation | Liu J.,North China Electrical Power University
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2012

The boiler steam pressure is an important parameter reflecting the state of boiler operation. A novel dynamic surface control (DSC) method was proposed for fuel-steam pressure system and only the boiler steam pressure was used in the control system. The mathematical model of the fuel-steam pressure building through test data fitting was transferred into state equations. The observer was designed to estimate the unknown states by using only pressure signal. Dynamic surface controller was designed and the problem of "explosion of complexity" inherent existing in traditional backstepping approach was overcome by the addition of low pass filters. From Lyapunov stability analysis, it is shown that all signals of the closed-loop system are semi-globally uniformly bounded and the tracking error may be kept arbitrarily small by adjusting control parameters. Simulation results show that boiler steam pressure signal can track the desired signal rapidly, which validates the effectiveness of the control system. © 2012 Chinese Society for Electrical Engineering. Source

Chi Y.,Changchun University of Technology | Chi Y.,North China Electrical Power University | Niu D.,North China Electrical Power University | Li X.,China Power Investment Corporation | And 2 more authors.
Dianli Xitong Zidonghua/Automation of Electric Power Systems | Year: 2010

Based on the principles of extenics and its major characteristics of matter-element theory, an analysis is made of the main factors affecting the quality of power supply service. Furthermore, the matter-element analysis model is used to build a quality evaluation index system for power supply service in the following steps: quality level division, construction of matter-element analysis model, calculation of correlation function values, calculation of weights, and determination of membership grade. Empirical analysis show the feasibility of the evaluation method proposed. © 2010 State Grid Electric Power Research Institute Press. Source

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