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RSS2017 Vol. 4, No. 4
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2017, 4(4): 1-7.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.001
Abstract:
Energy Utilization System includes energy transformation & transportation subsystem via certain media; energy utilization subsystem, which includes three areas: industry, architecture & transportation. The three energy finally terminal use forms are: electricity, heat and movement driving force. This is the general law of total energy utilization process. At the renewable energy era, the Smart Grid (SG) & Smart Natural Gas Grid (SNG), as the core bone structure of Energy Internet (EI), will connect thousands of basic units—Distributed Energy Systems (DES), realizing high-efficient transformation and the balance between supplying and demanding aspects, by means of Energy Storage Infrastructures on both top and bottom sides. It is necessary to clearly describe the Physical Hierarchy, Flux Structure and Function/Hierarchy Structure of all sub networks and units inside EI at first. Then it is possible to model and optimize them at all the level of planning, operating, controlling, management and marketing; realizing time-reliant balance and security guarantee by means of Internet, Big Data, Cloud Computation, and Artificial Intelligent.
2017, 4(4): 15-18.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.003
Abstract:
The static voltage stability margin is an important index to assess the static stability of power systems. It′s not only the significant basis of computing transmission capacities between regional power systems under the limit of voltage stability, but also the significant reference point for power systems to decide whether to adopt preventative measures. The 13th five-year plan of Guizhou power grid and relevant researches demand to compute the static voltage stability margins of Guizhou power gird during the 13th five year plan period. But current static voltage stability margin analyzing tools such as VSAP have certain limits in capable computing node numbers, which can′t satisfy the demand of computing the static voltage margins of Guizhou power grid .Thus , it′s necessary to find a new path to obtain the static voltage stability margins of Guizhou power grid. This paper puts forward a computing method using both PSD-BPA and MATLAB. PSD-BPA is mainly for system equivalent reduction, while MATLAB program is optimal power flow method responsible for computing the static voltage stability margins. The computing results demonstrate the feasibility and effectiveness of the method which can be further applied in the static voltage stability margins computing work in other provincial level power girds and regional power grids.
2017, 4(4): 19-22,33.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.004
Abstract:
In recent years, electrified railway has been developed rapidly in China and the number of railway traction station has been increasing constantly. In order to strengthen the reliability of railway traction station and reduce the adverse effects made by power system access of traction station, this article combined the load characteristics of electrified railway, analyzed its impact and solutions. Furthermore, we study current hidden problems and their causes of the railway traction station, then researched the safety and stability of the electrified railway power supply. Finally, some suggestions on optimization of the primary equipment and secondary equipment are proposed for coordinated operation of the traction station, which can provide planning guidance for access and configuration of traction station.
2017, 4(4): 23-28.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.005
Abstract:
The ±1 100 kV UHVDC transmission projects are the highest voltage class DC transmission projects in the world. Reasonable selection of DC field design type has great significance to enhance reliability of converter station and reduce the difficulty and cost of equipment manufacturing. Based on the Zhundong-Wannan ±1 100 kV UHVDC transmission project, requirement of equipment external insulation, manufacture level of equipment, technical and economic comparison of different type of DC field layout were discussed. The indoor DC field layout is recommended for ±1 100 kV UHVDC transmission projects.
2017, 4(4): 29-33.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.006
Abstract:
The article mainly solves the problem of the idea and method of the calculation of the auxiliary power in the field of solar thermal power plant design. Solar thermal power generation has become an important development direction of China's new energy power generation, and now there is no relevant procedure about the calculation method of solar thermal power plant auxiliary power rate. In the course of the study, we compared and analyzed the running mode of solar thermal power plant and fossil-fired power plant. Then we found the research result that the calculation method of fossil-fired power plant auxiliary power rate was not applicable to the solar thermal power plant. Based on the analysis respectively of collection field system, heat absorption and transfer system, heat storage system and conventional island system of parabolic trough solar power plant, this paper put forward a calculation method for auxiliary power consumption of parabolic trough power plant. In this paper, a conclusion is drawn that the solar thermal power plant should use long sequence typical year solar radiation value to hourly calculate the typical year's power generation and auxiliary power consumption, and auxiliary power rate is the ration of auxiliary power consumption and power generation. The calculation idea and method of auxiliary power rate of parabolic trough solar power plant can be used as an reference for the tower solar power plant, and it promotes the devolpment of solar thermal power plant design in China.
2017, 4(4): 34-36.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.007
Abstract:
At present, energy saving and emission reduction have been promoted in distributed energy stations. By analyzing actual heating condition for the distributed energy station in Guangzhou university town, we innovatively combined the characteristics of the project, and introduced the lithium bromide absorption type centralized refrigeration system, then maximized the use of energy. This work will provide a new reference for the engineering system design of distributed energy station.
2017, 4(4): 37-41.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.008
Abstract:
The thermodynamic system design, the main building layout design, the main and auxiliary equipments configuration design were reviewed in detail for Guangdong Yangxi power plant 2×1 240 MW ultra supercritical units, which expound the important significance of the construction of the first domestic over 600 ℃ and 1 200 MW grade ultra supercritical units, it achieves the breakthrough of China's thermal power generation technology and thermal power technology manufacturing industry. The design can be used as a reference for similar large capacity units design.
2017, 4(4): 42-48.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.009
Abstract:
The carbon content of fly ash is one of the important indexes to reflect the combustion efficiency of boiler in thermal power plant. Real-time and accurate detection of carbon content of fly ash is of great significance for guiding the operation of the boiler and enhancing the efficiency of the boiler. Most of the current detection devices use burning and reflection methods to measure the carbon content of fly ash, this kind of measurement subjects to long lag, low accuracy, high maintenance cost and poor field application effect. In this paper, the ash content of fly ash based on LSSVM was proposed, and the relevant operating parameters of convenience measurement were taken as auxiliary variables. The soft measurement model was used to forecast the carbon content of fly ash in real time. And this paper embeded LSSVM soft sensor system into the PLC, developed a kind of fly ash carbon content on-line soft sensor device which can achieve measurement quickly and accurately without the ash sample.
2017, 4(4): 49-54.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.010
Abstract:
The situation of rebuilding and expanding iron and steel bases has been existed in domestic steel corps at present. The captive power plants need to maximize the blending of blast furnace gas in order to achieve near-zero-emission of BFG. The research is based on the Baosteel Guangdong Zhanjiang Iron and Steel Base Captive Power Plant 2×350 MW Units Project. Through analysis, calculation and comparison, the large-ratio blending BFG subcritical boiler of 300 MW grade has been developed, as well as corresponding system, such as flue gas system, pulverizing system and flue gas desulfurization system. The results show that the performance indexes of the unit have been equal to or better than the design values since the operation. The maximum blending BFG ratio of each boiler is 30% when Baosteel base reaches the production capacity of 10 million tons, which is the maximum ratio of blending BFG in China. It is built to solve the problem of environmental pollution, to reduce energy consumption and the cost of captive power plant of steel corps. Thus, the research has high application promotion value and provides significant guidance for future projects.
2017, 4(4): 55-58,54.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.011
Abstract:
The detection of flue gas in the tail of the utility boiler is the important mean to guide the efficient production and low carbon emission for boiler, however, the accurate measurement of flue gas composition has been a thorny problem resulting from the special measurement environment with high temperature and complex composition. The quantitative relationship between light absorbance and gas concentration was deduced by calculus, and a new method for the measurement of gas concentration in a nonuniform medium environment such as boiler flue gas was obtained by in-depth study for the principle of laser measurement and tunable diode laser absorption spectroscopy (TDLAS). The actual measurement results in a boiler show that the laser measurement method has the advantages of high precision, safety and reliablity, which has a good application prospect.
2017, 4(4): 59-65.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.012
Abstract:
Under the loads of radioactive and other complex work conditions, reactor pressure vessel is prone to fatigue crack propagation of structures, which could lead to catastrophic damage. In this paper we introduced the developed finite element software ATLAS. By fully using of three-dimensional rendering capabilities of the GPU, ATLAS provided a large-scale highly interactive visualization environment for engineers. At first, ATLAS was used to analyze the size and location impact of the stress and displacement. Then, according to the structures and the forces of the pressure vessel, we created the model and load constraints, and analyzed the stress and deformation of the pressure vessel, simulated its working conditions, and determined its overall service life and weakness. We found that ATLAS can quickly calculate the stress linearization and the stress intensity factor, and complete the crack CAE analysis. In addition, we tested the anti-fracture analysis in accordance with ASME BPVC III D1 Standard Appendix G. By comparing the calculated values, conclusions can be drawn on whether it meets the anti-fracture requirements or not.
2017, 4(4): 66-70.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.013
Abstract:
Superconducting fault current limiter (SFCL) is an effective measure to limit short circuit current in power grid. The equipment research and development of 500 kV SFCL have been greatly developed. This paper made a study on measure point and protection configuration for 500 kV SFCL. Firstly, working principle of SFCL was introduced. Then based on the three major single line diagrams, the corresponding measure point and protection configurations were proposed. Finally, the cooperation between different protection schemes was discussed. Compared with the analysis, the scheme causing the lower affect to the reliability of power grid is found. The feasibility of the SFCL in the measure point and protection configuration is demonstrated, which has provided technical preparation for the implementation of the relevant projects.
2017, 4(4): 71-75,123.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.014
Abstract:
As the power system grows larger and larger, the short-circuit current is becoming a prominent problem. The fault current can be reduced by adding high-voltage series reactors in the system. High voltage series reactor can be arranged by the side of the substation on condition that space is available, otherwise it is a problem. This paper focuses on the condition when space is limited by the side of substation and carries out a scheme of setting an independent series reactor station in the power grid. The scheme can simplify the primary design, auxiliary power system design, secondary circuit design and communication design, and reduce investment and occupation. The scheme has been applied in projects. Most series reactors are added after the construction of substations. If space is limited, the independent series reactor station scheme can be a viable solution towards the problem.
2017, 4(4): 76-81.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.015
Abstract:
Multi power transmission lines arranged in the same corridor can avoid the land division, and reduce the adverse effect on the local planning and development, but the personal safety of operators in the process of towers and conductors erection of subsequent power lines should be seriously considered as a result of the induced voltage and current of the energized transmission lines in the corridor. One DC line under construction taken as an example, induced voltage and current generated from multi AC transmission lines in the same corridor were calculated and studied with ATP-EMTP electromagnetic transient program. The influence factors including the operating mode of the system, the distance between power lines and length of stringing conductors were analyzed at the same time. The research shows that the induced voltage and current are not significant because of lines under construction far from energized lines in the same corridor, while the induced voltage along the stringing conductors will be paid much attention to when the length of stringing conductors are much longer. The research results also have guiding significance to power lines′ construction which is adjacent to live lines.
2017, 4(4): 82-87.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.016
Abstract:
Compared to the widely used ACCC (Aluminum Conductor Composite Core) calbe, the ACMCC (Aluminium Conductor Multi-Strand Carbon-Fiber Core) cable use the multi-strand carbon-fiber core instead of the single carbon-fiber coer in ACCC, which has much better performance: higher stability and improved safety margin, better flexibility, simpler fittings as ACSR and easier for installation. Thus, ACMCC is future development trend of ACCC. In order to study the application prospect of ACMCC in new 500 kV overhead power transmission lines, taking two typical 500 kV double circuti AC lines as examples, different sizes of ACMCC cable are selected according to material-saving and energy-saving principle, and detailed technical and economic comparison is showed compared to the recommended cable, so economic performance of the ACMCC is given to direct the engineering application.
2017, 4(4): 88-94.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.017
Abstract:
With the increasingly narrow power corridor, the tower type is developing to multi-loop and high load, and the application of high strength steel is imminent. Based on a 500 kV project, aimed at high wind speed, multi loop conditions, this paper analyzed and compared the tower type in many aspects, such as the domestic and foreign application type, material, structure arrangement, full-scale test, engineering measures. The results show that the weight of the steel tube can be reduced effectively by using Q460. The stiffness of the tower is good and the deflection is small. The test tower strength and construction measure meet the design requirements, and have certain safety reserves. Therefore, under the large load conditions, the application of Q460 high strength steel tube has obvious economic and social benefits.
2017, 4(4): 95-99,94.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.018
Abstract:
The wind-resistant reinforcement technique of the reserved transmission tower-line system is actively investigated in this study. Base on the data of typhoon "Rainbow" , Internal forces of transmission towers were computed by the aids of finite element method to study the damage properties of transmission towers which subjected to typhoon. Furthermore, the reinforcement techniques of the transmission tower were examined for major members, crew members and foundation respectively. The research can be taken as the reference for the wind-resistant design of transmission tower.
2017, 4(4): 100-107,112.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.019
Abstract:
For sandy seabed, seabed overall instability are always caused by the wave-induced seabed liquefaction, which will have serious impact on the stability of the structures (offshore wind turbines, oil platforms) upper the seabed. To control the influence of seabed liquefaction, large number of scholars have investigated the wave-induced layered seabed response and liquefaction suppression with analytical and numerical methods, while related experimental research are still in its infancy. To further improve the related test rule and data, the study used one-dimensional cylinder experimental equipment to study the sandy deposit response and liquefaction suppression under wave loading, and found that when replace part of the seabed as liquefied protective layer, seabed liquefaction would greatly suppressed; when the thickness of liquefied protective layer reach 10% , seabed liquefaction phenomenon would not occur.
2017, 4(4): 108-112.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.020
Abstract:
Various factors which may cause corrosion are investigated to solve the corrosion issue of seawater butterfly valves disc used in nuclear power station.The system working condition, butterfly valve disc material selection, casting process, environment condition and other factors were analyzed to find the possible causes of the corrosion of the disc. Finally, aiming at these factors, some targeted measures are put forward to provide solution for corrosion of seawater valves.
2017, 4(4): 113-117.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.021
Abstract:
To analyze the differences of PV module under vertical and horizontal arrangement in technical economics, 1 MWp PV array generating capacity models and support structure models were promoted based on the PV module parameters and the geological and hydrological conditions in Sonid Right Banner of Inner Mongolia. According to the results, PV module under vertical arrangement is slightly prior to the one under horizontal arrangement in technical economics.
2017, 4(4): 118-123.
doi: 10.16516/j.gedi.issn2095-8676.2017.04.022
Abstract:
A design scheme for intelligence inspection system of DC indoor switch yard has been present in ±1 100 kV Converter Substation, when the equipment of DC indoor switch yard in ±1 100 kV Converter Substation are working, the design scheme can satisfy inspection requirement under the complex electromagnetic environment so operators don′t need to go into the DC indoor switch yard. With the intelligence inspection system operators can complete the daily inspection to main equipment who don′t need to enter into DC indoor switch yard. Configuration of dual intelligent inspection equipment and manual recovery of inspection equipment not only improve the reliability of inspection but also maintain it in time when single set of inspection equipment is not working. The design scheme improve the automation degree of inspection, the system can meet the requirements of asset life cycle management requirements and improve the reliability of equipment and power grid security.
