Hua Z.,North China Electrical Power University |
Hua Z.,China Power Investment Corporation |
Hu G.,North China Electrical Power University
Journal of Computational and Theoretical Nanoscience | Year: 2016
This paper introduces the automatic adjusting and optimizing process of coordinated control system, water supply control system, and primary and secondary superheater steam temperature control system in a large power plant ultra-supercritical unit. In accordance with the requirements of AGC under the different working conditions, to optimize the control strategy of coordinate system, water system and steam temperature system, and to adjust the key parameters, which reduced the fluctuations of controlled parameters, and improved adaptability of the thermal power unit to the change of power load, and also improved the safety, stability and economy of the unit, and it provided the technical support for the safe operation of power grid. Copyright © 2016 American Scientific Publishers All rights reserved.
Jiang H.,Tsinghua University |
Lin J.,Tsinghua University |
Song Y.,Tsinghua University |
Gao W.,University of Denver |
And 4 more authors.
IEEE Transactions on Power Systems | Year: 2014
Reducing the fossil fuel consumption of aluminum smelting production, which consumes around 8% of electricity annually, is of great significance for China's energy sector. One possible solution is to integrate wind power as supply for aluminum smelter loads. Based on this background, this paper studies an actual industrial case-an isolated power system for aluminum production with integrated wind penetration levels as high as 30%. However, due to the integration of wind power, frequency stability issues become critical in such a system. Therefore, a demand-side frequency control scheme responding to frequency deviations of the system is proposed in this paper to control the load power of aluminum smelters. The scheme is designed based on the relationship between the DC voltage supply for aluminum smelting loads and the commutation voltage drop which can be adjusted by changing the inductance value of the saturable reactors. Finally, simulations under both N-1 and N-2 contingency scenarios demonstrate the effectiveness of the proposed control scheme considering various wind power outputs. © 1969-2012 IEEE.
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.
News Article | December 6, 2016
Global Aluminum Market 2016 Research Report initially provides a basic overview of the industry that covers definition, applications and manufacturing technology, post which the report explores into the international players in the market. This is a professional and in-depth study on the current state of the Aluminum Market. The report provides a basic overview of the industry including definitions, classifications, applications and industry chain structure. The Aluminum market analysis is provided for the international markets including development trends, competitive landscape analysis, and key regions development status. Complete report on Aluminum Market spread across 127 pages providing 21 company profiles, Inquire more at http://www.deepresearchreports.com/contacts/inquire-before-buy.php?name=311619 Global Aluminum Market Segment by Regions, this report splits Global into several key Region, with production, consumption, revenue, market share and growth rate of Aluminum in these regions, from 2011 to 2021 (forecast), like North America, China, Europe, Japan, India, Southeast Asia split by product type, with production, revenue, price, market share and growth rate of each type Split by application, this report focuses on consumption, market share and growth rate of Aluminum Market in each application. Key Manufacturers analysed are Rio Tinto Plc, BHP Billiton Group, United Company RUSAL Plc, Alcoa, National Aluminum Company Limited, Norsk Hydro ASA, Aluminerie Alouette, Hindalco Industries Limited, Vedanta Resources Plc, Aluminum Corporation of China Limited, China Power Investment Corporation, East Hope Group Company Limited, Guangdong Dongyangguang Aluminum Co. Ltd, Qingtongxia Aluminum Plant, Jiaozuo Wanfang Aluminum Manufacturing, Vimetco N.V, YiChuan Yugang Longquan Aluminum Company, Corporación Venezolana de Guayana, Trimet Aluminum SE, Century Aluminum Company and Noranda Aluminum Holding Corporation. Split by product type, Aluminum Market production, revenue, price, share and growth rate of each type, can be divided into Type I, Type II and Type III. This report studies Aluminum in Global market, focuses on top manufacturers in global market, with sales, price, revenue and market share for each manufacturer. With the list of tables and figures the Aluminum Market report provides key statistics on the state of the industry and is a valuable source of guidance and direction for companies and individuals interested in the market. The Global Aluminum Chloride Industry 2016 Market Research Report is a professional and in-depth study on the current state of the Aluminum industry. The report provides a basic overview of the industry including definitions, classifications, applications and industry chain structure. The Global Aluminum Chloride market analysis is provided for the markets including development trends, competitive landscape analysis, and key regions development status. Development policies and plans are discussed as well as manufacturing processes and Bill of Materials cost structures are also analyzed. This report also states import/export consumption, supply and demand Figures, cost, price, revenue and gross margins. The report focuses on major Global leading industry players providing information such as company profiles, product picture and specification, capacity, production, price, cost, revenue and contact information. Upstream raw materials and equipment and downstream demand analysis is also carried out. The Global Aluminum Chloride industry development trends and marketing channels are analyzed. Finally the feasibility of new investment projects are assessed and overall research conclusions offered. Explore more reports on Chemicals market at http://www.deepresearchreports.com/cat/chemicals-market-research.html
Zhang X.,China Power Investment Corporation |
Wang J.,China Power Engineering Consulting Group Corporation |
Sun R.,China Power Engineering Consulting Group Corporation |
Dong J.,China Power Investment Corporation |
And 2 more authors.
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | Year: 2011
Thermal power plants using air-cooling system increase project capital investment and operating costs compared to those using water-cooling system, so the optimal design of the air-cooling system is very important and can improve the overall economics of the air-cooling power plants. The optimal design method of direct air-cooling system was proposed based on minimizing the annual expenses. The selection of the design temperature, initial temperature difference (ITD), the air cooler tube type and air cooling fan, the calculation of heat transfer and air resistance were analyzed and discussed. The direct air-cooling system of one 600 MW thermal unit as the localization demonstration project was used as an example to illustrate the application of the optimal design method. The method has been applied to direct air-cooling system design of 36300 MW and 600 MW domestic thermal units, and is incorporated into the relevant national design standards. ©2011 Chin.Soc.for.Elec.Eng..
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.
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.
Sun Y.,Wuhan University |
Liao S.,Wuhan University |
Xu J.,Wuhan University |
Gu R.,China Power Investment Corporation |
Bao Y.,Wuhan University
IET Generation, Transmission and Distribution | Year: 2016
This study presents the industrial implementation of a wide area measurement system (WAMS)-based real-time control scheme in an actual isolated power system for aluminium production in China. As driven by wind and coal power, this isolated power system is both economical and environmental friendly. However, the frequency stability issue is challengeable due to its special load characteristic. WAMS-based control is technically feasible for this issue owing to its instantaneity in monitoring power disturbance, calculating and sending control command. This study presents the industrial implementation method of the WAMS-based control scheme. This industrial implementation provides demonstrative value for WAMS-based control technology, significantly expanding the industrial application prospect of WAMS. © The Institution of Engineering and Technology 2016.
Xu J.,Wuhan University |
Liao S.,Wuhan University |
Sun Y.,Wuhan University |
Ma X.-Y.,Wuhan University |
And 5 more authors.
IEEE Transactions on Power Systems | Year: 2015
Due to the uneven geographical distribution between load and wind power, currently it is difficult to integrate the large-scale wind power into the State Grid in China. There are significant wind curtailments for wind farms due to system restrictions. This paper proposes a new way of utilizing wind power, i.e., in-situ consumption, as an alternative to the costly development of long-distance transmission of large-scale wind power. Electrolytic aluminum load, which is one of the most typical high energy consuming loads, is employed to absorb the excess wind power in western China. An actual isolated industrial power system for aluminum production driven by wind power and coal-fired power is described. The penetration level of wind power in the isolated power system is up to 48.8%. The power imbalance between generation and load demand caused by wind power fluctuation or the tripping of coal-fired generators can dramatically impact the frequency stability of the isolated power system, which is of small inertia. An online identification method of power imbalance based on Wide Area Measurement System (WAMS) is presented. According to the characteristics of the electrolytic aluminum load, a system frequency control method by regulating the bus voltages of aluminum loads to eliminate the power imbalance is introduced. The simulation is done in Real Time Digital Simulator (RTDS) and the results verify the validity of the proposed frequency control method. © 2014 IEEE.
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.