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01 June 2012, Volume 33 Issue 6
    

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  • Investigation Security Protection System for Smart Grid
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 1-5.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    This paper discussed the three-defense-lines of security protection system. The three-defense-lines was expanded under the condition of using smart grid technology, based on the analysis of intelligence support technologies, such as intelligent power generation, substation, transmission, dispatch, communication and the wide area measurement. The technology of intelligent prevention and control could optimize the grid operation scheme with the methods of risk early warning and forecast verification, and made terminal of defense system effectively move forward. The technology of intelligent emergency control could implement the strategy of global closed-loop control with the methods of online calculation and real-time control, which could strengthen the stable operation of power grid. The technology of intelligent restoration control could speed up recovery process of power grid with the methods of default scheme and rolling optimization, which could effectively reduce blackout time and economic loss.
  • Design and Application of Intelligent Condition Monitoring System for Substation Equipment
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 6-10.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    For the upgrade of China power grid from the traditional grid to smart grid, there are many requirements of construction and retrofit for the intelligent condition monitoring systems in substations. Base on the analysis of the structure of the intelligent condition monitoring system for substation equipment, this paper put forward a design scheme that met the needs of smart grid. It had been applied in an engineering project for the modeling and application of DL/T 860 standard in the intelligent condition monitoring system. The results show that it can achieve the functions of communication services, devices’ standardization, system interface and master diagnosis functionality. This paper also pointed out the problems in the current application.
  • Key Technology of Gansu Virtual Intelligent Park Construction
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 11-14.
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    The industrial park with the intensive of different enterprises has gradually become highly concentrated area of electric energy consumption in distribution network. The proportion of wind power has increased year by year in Gansu power grid structure, which has prominent characteristics of high energy-consumption, high lift and low bearing capacity. And the complementary of power load is poor in existing industrial park, due to the same type of enterprises. So the realization of cross-park or trans-regional power information interaction and complementary has a great significance with the help of information platform. This paper proposed a concept of virtual intelligent park, and investigated the key technology and demonstration application of the virtual intelligent park with taking 20 power consumption enterprises in one high-tech industrial development zone as example.
  • Uplift Behavior Test on Assembly Foundation of Steel Structure in Transmission Line
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 15-18.
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    According to the situations of urgent construction period and difficult transportation in transmission line engineering, the field uplift behavior tests on assembly foundation of steel structure were carried out in hard backfill clay. The loading-displacement curves were obtained, and the stress-strain relationship in steel components and the earth pressure variation changes were investigated. This paper presented the important data for the theory of capacity calculating, design method and engineering applications of this kind of foundations in transmission line engineering.
  • Integrated Standardization Programs of Electric Energy Acquisition System in Jiangsu Power Grid
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 19-22.
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    The status quo of meter reading system and automatic electric energy acquisition system under grid side in Jiangsu Province was introduced. According to the configuration of metering terminal and terminal server, the standardization programs of power acquisition for 35~220 kV substation in Jiangsu were proposed with the advanced and economical resources integration principles, which could provide a complete data service for the line loss management.
  • Effect of Micro-Terrain on Transmission Line Galloping
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 23-26.
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    A flow field model and a dynamic model of transmission line are introduced based on the analysis of micro-terrain effect on transmission line galloping. The dynamic simulation analysis was carried out for a transmission line with the consideration of micro-terrain influence, of which result was consistent with the practical observation. The results show that micro-terrain has significant effect on the transmission lines galloping characteristics of vibration mode and amplitude, with the comparative analysis of the simulation results with and without micro-terrain effect.
  • Analysis on GIL Connection for Main Transformer and GIS
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 27-29.
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    The application of gas-insulated line (GIL) connection was analyzed through techno-economic comparison, for the layout optimization of outdoor gas-insulated switchgear (GIS) substation. The result shows that this method has some advantages, such as economic in investment, little in occupy floor, reliable in connection, and it can promote the “resource conserving, environmental friendly and industrialized” substation construction. This paper put forward some proposals for the application of GIL connection, based on the deep analysis on the problems of using GIL connection during factory, handover preventive testing or maintenance.
  • Noise Prediction and Control in 750 kV Substation
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 30-33.
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    This paper analyzed the main noise sources’ principle and transmission routes in 750 kV substations. According to the noise’s sound power levels, the noise inside and outside the stations was investigated with the SoundPLAN software, in order to get the intuitive noise distribution map and the noise control measures, which were suitable for the substation and the factory sectors, as well as the sensitive point.
  • Type-selection Optimization of Cone Cylindrical Foundation inPermafrost Areas at High Altitudes
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 34-36.
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    Cone cylindrical foundations are widely used in Qinghai-Tibet HVDC Project at high-altitude permafrost areas, due to its structure advantages of reducing or eliminating tangential frost-heave forces. In accordance with contrast analysis on performances and characteristics of cone cylindrical foundations at different cross section, multi-program optimization and improvement design were carried out according to the geological conditions of permafrost in Qinghai-Tibet HVDC transmission line project.
  • Analysis and Prevention of Main Natural Disasters of 500 kV Transmission Lines in Central China Power Grid
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 37-42.
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    Natural disasters are the main factors of the transmission line fault. Based on the statistical analysis of main natural disasters of 500 kV transmission lines in the central China power grid, this paper investigated the accident cases according to the disaster type, time, areas, season and other factors. Several main disaster mechanisms and prevention strategies for the 500 kV transmission lines were studied. At last, this paper presented some suggestions for the disaster resistance and reduction, which could provide references for the safe and stable operation of the transmission lines.
  • Anti-overturning Formula for Narrow-base Tower Foundation in Transmission Line
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 43-46.
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    Based on the current anti-overturning studies for other structures, this paper discussed the anti-overturning formula for narrow-base towers, which was derived with method of limit equilibrium analysis. The comparative analysis between anti-overturning formula and finite element simulation were studied. The results show that the anti-overturning bending moment obtained from the formula is accord with the actual working condition, and the checking and correction formula can provide references for the engineering design.
  • Numerical Simulation of Wind-induced Vibration for Iced Conductors
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 47-49.
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    Based on the aerodynamic characteristics of conductor galloping, the fluid field around iced conductor was analyzed by using fluid dynamics. The aerodynamic coefficients at various wind speed and attack angles were calculated through numerical simulation, and the influences of the wind speed, attack angles on conductor galloping were discussed. Besides, the cable elements were used to simulate transmission line for the mechanics model of iced conductor galloping. The iced conductor galloping was modal analyzed with the use of Ansys, and the wind-induced response of iced conductor was studied with the use of harmonic superimposing method. The first six natural frequencies and eigenvectors were obtained and the displacement response curves of some vibration mode of the line were drawn, which could provide references for the iced conductor design.
  • Application of Post-grouting Technology in Tower Foundation Construction of Transmission Line
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 50-54.
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    Post-grouting pile has been widely applied in the field of civil building, as a new type of pile foundation recommended in technical code for pile foundations. However, it could not be used in transmission line directly due to the lack of theoretical parameters and practical application. This paper investigated the post-grouting piles used in the field of transmission line, such as strengthening mechanism, design calculation, grouting layout, technological process, construction equipment, artificial material and so on. The calculation method was suggested for the post-grouting pile under uplifting load and horizontal load. And the main advantages, application scope and economy of post-grouting piles were analyzed and compared.
  • Multi-Peak MPPT Method under Partially Shaded Conditions Based on Voltage Sweeping Method and Incremental Conductance Method
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 55-59.
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    ABSTRACT： The traditional maximum power point tracking (MPPT) methods under even radiation condition usually have high efficiency. As the strong nonlinearity between photovoltaic (PV) array, irradiance and temperature, the traditional MPPT methods fall into local maximum under partially shaded conditions, which result in the failure of tracking the maximum power point. This paper established the PV array model under partially shaded conditions, and the voltage sweeping (VS) method was first used to get the voltage near the maximum power point by voltage sweeping comparison method, according to the multi-peak conditions caused by partially shade. Then the voltage value near the maximum power point was used as the initial value of variable step size incremental conductance method (INC) to finally locate the maximum power point. This method can avoid the maximum power point falling into local maximum under multi-peak conditions and effectively track the maximum power point under partially shaded conditions.
  • Pump Wheel (Frequency Conversion) Speed Regulation Method for Hydrodynamic Coupling of Motor-driven Feed Water Pump in thermal Power Plant
    wenhai zhang Li-Qun AN
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 60-63.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The frequency control system used in thermal power plant can produce good economic benefit. Based on the purpose of keep hydrodynamic coupling still and variable frequency speed regulation, this paper put forward pump wheel speed regulation method for hydrodynamic coupling. The result shows that the frequency control is the best way to realize this method for hydrodynamic coupling. And frequency control for motor-driven feed water pumps can be effectively implemented in 200, 300 and 600 MW unit with the utilization of this method, which can save more than 20% of electricity.
  • Optimization Scheme of the Lightning Protection Design for Chlorination Station in Nuclear Power Plant
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 64-67.
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    The most important factor considered in the lightening protection design of chlorination stations in nuclear power plants is the safety. Taking a 2×1 000 MW nuclear power plant as an example this paper proposed an optimized lightening protection design scheme for the chlorination stations in nuclear power plants according to hydrogen generation station design standards and experience from similar nuclear power plants that had been already in operation. The designs of lightening rod, grounding system and lightning protection induction were all included in this scheme, which emphasized on the safety and reliability as well as considering the economic rationality, in order to provide a reference for similar projects.
  • Cause Analysis of Ammonia Escape in SCR Flue Gas Denitrification Process for 600 MW Units
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 67-70.
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    This paper pointed out that the basic reason of air preheater’s corrosion and blocking in the selective catalytic reduction (SCR) flue gas denitrification process was ammonia escape. The influence of flow field distribution, automatic regulation for the ammonia spraying and flue gas analysis instruments on the ammonia escape were investigated, in order to suggest the method of reducing ammonia escape. The result shows that the grid nozzle for ammonia spraying should be improved.
  • Optimization and Improvement of High and Low Pressure Bypass Control System of in 300 MW Once-through Boiler Power Generation Unit
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 71-74.
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    This paper introduced the control system and composition of the high and low pressure bypass in No5 and No6 300 MW once-through boiler power generation units in Huaneng power plant as examples. There were some problems in this system, such as unsatisfactory function and accuracy of the control system, and aging single loop controller. It was necessary to take measures for these problems, which included optimizing control logic, regulating control parameters, replacing on site single loop controller, perfecting interlock protection function and so on.
  • Analysis of Trip Protection for Siemens Ultra-supercritical Turbine
    xie weiyang
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 75-77.
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    Siemens ultra-supercritical (USC) turbine has the characteristics of unique structure, compact arrangement, quick start-up, stable operation, high efficiency and a lot of protection that increases the trip probability. According to the unconventional trip protection conditions, this paper analyzed probable cause, adoptable measures and possible consequence of the turbine trip, and suggested to reserve, modify and delete some trip protection conditions, which could provide some references for the units protection conditions setting.
  • Impact of Geometric Imperfection on Stability of Thin-walled Tower Vessel
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 78-80.
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    This paper developed design software combined with Germany DIN 18800 standard, based on ANSYS. The influences of construction quality and stiffening rib on the shell’s design stress were investigated by means of buckling theory, based on a practical project. The results show that the difference of construction quality can greatly change the design stress of thin-walled cylindrical shell. And the reasonable spacing of stiffening rib can make the critical stress get better play in the shell’s stability analysis.
  • Application of Communication on Domestic DCS System Based on Modbus Protocol
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 81-83.
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    According to the communication problems between EDPF-NT+ distributed control system (DCS) and third-party, this paper proposed a effective strategy that established a communication to third-party or multiparty based on Modbus RTU protocol or Modbus TCP protocol in EDPF-NT+ system, which could effectively solve communication problems frequently encountered in EDPF-NT + system.
  • Influence Factors of Fitting on Grip Strength of Large Cross-section Conductor
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 84-88.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Jinping-Sunan ±800 kV UHV DC line uses hydraulic splicing fitting and strain clamp, and the grip strength of fitting should be more than 95 % RTS. Because 900 mm2 large cross-sections ACSR was 4-layer aluminum stranded structure, especially the aluminum/steel ratio of JL/G3A－900/40 conductor was larger, this paper mainly studied the influence factors of fitting on the grip strength of large cross-section conductor. The result shows that there is a wire strength loss caused by crimping, which is the main influence factor, as well as aluminum /steel ratio.
  • Polarization and Application of the New-type Energy-saving Conductors in Transmission Lines
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 89-92.
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    Combined with the polarization and application of new technologies in capital construction, the energy-saving principle and performance of the high conductivity aluminum conductor steel reinforced(ACSR), aluminum conductor alloy reinforced(ACAR) and moderate-strength all aluminum alloy conductor(AAAC) are introduced. Subsequently, the technical differences in electrical and mechanical properties between the three conductors are comparative analyzed, and the sensitive factors of construction cost are also discussed. By the means of both annual cost and payback methods, the economy evaluations of the three conductors are made. In order to popularize the energy-saving conductors, some application suggestions are proposed in the end.
  • Consumptive Mechanism of Sales Price for Large-scale Wind Power
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 93-96.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In recent years, wind power presents the common characteristics of installed capacity’s rapid growth, large-scale and centralized development. The large-scale access of new energy causes the problem of large-scale consumption for wind power. However, the existing electric sales price mechanism restricts the local consumption and long-distance transmission of wind power. In order to promote the development of wind power, it is urgently needed to formulate new electric policies suitable for the large-scale consumption of new energy. This paper set up two sales price models for local consumption or distant consumption of wind power respectively. The strategies were suggested for the sales price of wind power consumption, based on the calculations of local or distant consumption for the wind power in Gansu with two models, of which the results proved the validities of the models conversely.
  • Design and Application of Online Real-time Monitoring System for Heat Supply Unit
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 97-99.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    Along with the cogeneration units constantly put into operation, the problems of electric load control and peak-load regulation for heat supply unit during heating period have attracted a wide spread attention, and the online real-time monitoring system is helpful to solve these problems. Taking online real-time monitoring system in Jilin Songhua River Thermal Power Plant as an example, this paper investigated the design and application of this system, such as system composition, software function and so on, put forward the matters needing attention in the design as well.
  • Construction of Vehicle-based Emergency Communication System for Shandong Electric Power System
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 100-104.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    In order to meet the need of strong smart grid construction, Shandong Electric Power Company had built a vehicle-based emergency communication system as a very important part of emergency system construction, under the unified arrangement of State Grid. According to the geography and traffic condition in Shandong Province, with the ideas of vehicle-based emergency communication and emergency division and the core technologies of satellite communication and 3G communication, this paper introduced the construction scheme of vehicle-based communication system, based on the technologies such as computer network, soft switch voice processing, digital wireless talkback, video conference and AV (audio/video) signal acquisition and processing system.
  • Transportation of Heavy Elements for UHV Steel Tube Tower in River Network Area
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 105-108.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    The design of double-circuit transmission lines of steel tube tower was used in the 1 000 kV UHV AC transmission line from Huainan to Shanghai. The transportation of steel tube tower’s heavy elements had some difficulties in the river network area. This paper introduced the transportation scheme of using gasbag and land boat, which was feasible for the steel tube tower’s heavy elements in the river network area. The development of outfitting tools for this transportation scheme was investigated, as well as the field tests.
  • Piping-Block Modular Construction Technology for Nuclear Power Plant
    ELECTRIC POWER CONSTRUCTION. 2012, 33(6): 109-112.
    Abstract ( ) Download PDF ( )   Knowledge map   Save
    This paper investigated the piping-block modular construction technology in CPR1000 nuclear power plants, discussed the selected principle and design process of the piping-block module, and developed the design function for the piping-block module using 3D platform, based on the successful experience of this technology used in foreign countries. The technical conditions were suggested for the implementation of piping-block module, which could provide a reference for the application of modular construction in the construction of CPR1000 nuclear power plants.
Administrator：State Grid Corporation of China
Sponsors：
State Grid Economic and Technological Research Institute Co. Ltd
China Power Engineering Consulting Group Co., Ltd
China Electric Power Research Institute
Editor in Chief: Zhang Quan
Associate Editor-in-Chief:KANG Chongqing, BI Tianshu, LI Hui
Executive Editor-in-Chief:YANG Weihong, SHENG Yi
Editorial Director:WEI Xihui
CN: 11-2583/TM
ISSN: 1000-7229
Address: Tower A225, SGCC, Future Science & Technology Park, Beijing 102209, China
Post Code: 102209
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Post Issue Number: 82-679
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