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RSS2017 Vol. 4, No. 1
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2017, 4(1): 1-9.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.001
Abstract:
After the technical standard implementation of ASCE/SEI 43-05 which is seismic design criteria for structures, system and components in nuclear facilities, the structure seismic design and analysis have the essential distinction between the second generation and the third generation nuclear power plant, then U. S.A. has carried out a series of corresponding nuclear regulation and technical standard to adapt to the changes of structure seismic design and analysis for the third generation nuclear power plant. The Nuclear Regulatory Commission in U. S.A. has revised the nuclear regulation and technical standard according to the the new versions of Seismic System Analysis SRP 3.7 Rev.3 in 2007 and SRP 3.7 Rev.4 in 2014, which confirms the stricter criteria for the seismic design of structures, system and components in nuclear facilities. More than 40 years of practical experience in structure seismic design and analysis from Shanghai Nuclear Engineering Research and Design Institute has been reviewed, then the latest nuclear technical standard, main contents and analysis methods are introduced, finally the research work provides some guidance for further nuclear practical engineering.
2017, 4(1): 10-17.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.002
Abstract:
Offshore grouting is an important technology impacting the offshore wind power development. Due to the long-term dynamic loading of offshore wind turbine, there is a big difference in grout material, connection type, mechanics and others compared with conventional marine engineering. Offshore wind turbine foundation grouting has superior performance of high early and final strengthen, fatigue resistant and segregation resistant. In this paper, grout material requirement was first introduced briefly. Then two typical grouted connection types of monopile and jacket as well as their engineerign application were described in detail. Finally, grout diseases's monitoring and repair was stated briefly and overview of offshore grouting technology's development was summarized.
2017, 4(1): 18-24.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.003
Abstract:
With the development of "Global Energy Internet" , wind power, the installation of solar power and other new energy power generation increases a lot. One of the most urgent problems facing power grids in China is the growing peak-valley difference. Coal-fired power plants, the main power supply, have to play an important role in peak load regulation in the future. Peak shaving demand, operation modes and new problems threaten the safety of units and relevant support policies were summarized and analyzed in this paper. Results showed that the main and auxiliary equipment deviates from the best operation condition when they take participate in the peak regulation, which would cause high safety barriers, energy-consuming problems, and environmental pollutants and some other issues. Finally, this work provides some guidance for policy-making and power grid dispatching with some recommendations to deal with the peak load regulation problem.
2017, 4(1): 25-30,37.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.004
Abstract:
Interconnection and coupling between electric power system and heating, natural gas system have become increasingly close. From the point of view of coordinated optimization of district electricity and heating system, through the establishment of mathematical model of power system and heating system, with the goal of total energy loss reaches the minimum, with equality and inequality constraint system, the optimization model of district electricity and heating system based on genetic algorithm is constructed in this paper. Taking a district electricity and heating system as the research object, using the above optimization model to model and analyze, the practicability and validity of the optimization model of district electricity and heating system based on genetic algorithm are verified. In this paper, the research content lays the foundation for the operation optimization of district electricity and heating system.
2017, 4(1): 31-37.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.005
Abstract:
A framework for wind power generating output characteristic analysis has been proposed from the perspective of time and space distribution. The proposed framework includes long-term and short-term generating output characteristic analysis of a single wind farm, the relation of long-term fluctuation and the complementation of short-term fluctuation of wind farms cluster. The proposed method was applied to an analytic study of Wenchang wind farm, Danzhou wind farm, Dongfang wind farm and the Hainan wind farm cluster to reveal its rationality and feasibility.
2017, 4(1): 38-43,48.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.006
Abstract:
In order to study the complex flow and heat transfer in power engineering design, computational fluid dynamics(CFD) technology was used to study exhaust steam system of steam feed pump, direct air cooling system and flue system. The calculation purpose, calculation domain and boundary conditions are described in detail, and the internal flow characteristics of each system is obtained. From all aspects of the application, CFD technology has a wide application prospect in power engineering design field.
2017, 4(1): 44-48.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.007
Abstract:
Due to the pursuit of higher design parameters in 1 000 MW power plants with double re-heating cycles, the traditional single row high pressure U-tube heater was strongly restricted since it could not meet such high parameters.As a result, the double row high pressure U-tube heater was introduced to newly constructed double re-heating units, which in turn leads to greater system complexity and operation difficulty regarding to the main feed water system. The present paper conducted the characteristic and localization domestication comparison between the new high pressure heaters (i.e. high pressure serpentine heater) and high pressure U-tube heater, results showed that: it is feasible to apply high pressure serpentine heater in 1 000 MW power plants with double re-heating cycles, considering its good system simplicity, excellent thermodynamic adaptability as well as high operation reliability. Moreover, it is recommended to apply the high pressure serpentine heater in similar engineering domains, as it will lay a firm foundation for manufacturing high pressure heaters in ultra-supercritical units with higher design parameters in the near future.
2017, 4(1): 49-52.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.008
Abstract:
The water wall cracking is a big problem for 600 MW supercritical W-flame boiler. The investigation and survey results about 600 MW supercritical W-flame boiler water wall cracking were indicated. The reason of water wall cracking was analyzed according to the boiler operation. The main reason is the furnace thermal deviation in horizontal direction. The fully mixing header is provided on the transitional section of the water wall, which is the most useful method to prevent the water wall cracking.
2017, 4(1): 53-56.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.009
Abstract:
The implementation plan of digitization of coal yard management, the supply of coal by bunker and the precision of distribution of coal, which is drew to standardize the management of coal combustion system, accomplish the whole procedure of approach, monitor, meterage, unloading and access. Due to the requirement of load flow, economics and environment, the system provide an optimal plan for the operation of each link in the chain. The system can give an alarm when the over temperature, overdose or any other abnormal situation comes out.
2017, 4(1): 57-60.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.010
Abstract:
This paper focuses on the induced voltage and induced current of the double circuit lines on the same tower. The system component model of 500 kV Power plant access system engineering is built by use of electromagnetic transient program (EMTP). The three-phase voltage unbalance, three-phase current unbalance, inductive voltage, and inductive current of the double circuit line in the same tower from Power Plant to ChengXi substation are calculated by this model. The results show that the three-phase voltage unbalance and three-phase current unbalance can meet the requirements of the national standard based on the current phase sequence and transposition condition which is recommended in this project. When selecting the grounding switch, the inductive voltage should up 5% on the basis of the results in the study, and the inductive current could refer to the results in this study.
2017, 4(1): 61-65.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.011
Abstract:
In order to avoid the commutation failures of receiving end convertor Converter station in LCC-HVDC transmission systems, and to improve the voltage stability of receiving end converter station AC system, the Line Commutated Converter in receiving end converter station retrofit for Voltage Source Converter, that form the Hybrid HVDC transmission systems which sending end is LCC-HVDC and receiving end is VSC-HVDC. In order to reduce the outage time during the retrofitting process, intensive study on transition scheme of sending and receiving ends converter station according to Guizhou-Guangdong I HVDC Project of CSG, Put forward transition scheme of LCC-HVDC retrofit for VSC-HVDC, the research results have great reference value to the Hybrid HVDC transmission systems.
2017, 4(1): 66-70.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.012
Abstract:
With the continuous development of VSC-HVDC technology, it has become the mainstream of DC transmission technology. In the island power supply, wind power access, power grid interconnection, and so has a large number of applications, has accumulated plenty of engineering experience. Because of its own characteristics, VSC-HVDC technology has an innate advantage in power supply for offshore platforms. Based on the technical foundation of the VSC-HVDC converter station on land, this paper discusses the engineering application scheme of the offshore platform converter station from the aspects of topological structure, main electrical equipment selection, electrical plane layout and secondary system, etc. And it also has a number of positive ideas and suggestions about the VSC-HVDC technology offshore platform power supply applications and the development of the direction.
2017, 4(1): 71-74,70.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.013
Abstract:
AC-DC Interference can cause relay protection misoperation, it is still lack of workable theory and digital simulation models. In this paper, a theory analysis and digital simulation models of AC-DC Interference are proposed. The theory analysis and simulation models are proved correctly by experiment evaluation. The capacitance of cable to ground, resistance for current limit and AC interference voltage are the major factors to affect the voltage between the relay terminals. Finally, proposals of improving the relay action power, reducing the capacitance of cable to ground, choosing a reasonable resistance for current limit and checking the capacitance to ground regularly are presented.
2017, 4(1): 75-80,101.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.014
Abstract:
Use of surge arrester is an effective measure to prevent the transmission line from lightning trip which is mostly caused by lightning strike. In order to reduce the lightning trip rate and improve the operation safety, the performance against shielding failure and back striking of a 500 kV single circuit line without a line surge arrester are simulated by ATP-EMTP In this paper. The influencing factors of the performance are analyzed, the installation principle of lightning arrester is put forward, and thus a comparative study of different installation schemes is carried out. The research shows that the surge arrester can effectively improve the lightning protection performance of the line. For the horizontal wire arrangement of single circuit, arrester should install at higher towers of more impulse grounding resistance on both sides of the phase conductors to prevent back striking, while of large ground obliquity on downhill side phase conductors to prevent the shielding failure. The research results are helpful to guide the line arrester installation location and design work.
2017, 4(1): 81-86.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.015
Abstract:
In order to solve the problem of the application of copper clad-steel wire in practical engineering, a parallel model of solid cylindrical conductor and hollow cylindrical conductor was established, and its impedance expression was proved. The minimum cross-sectional area of the ground conductor of different materials were checked with thermal stability, and the appropriate size of the conductors were selected, and the international general software CDEGS was used for grounding calculation of large grounding grid. The rationality of the method was proved with the analysis of the calculation results, and we found that the grounding parameters of copper-clad steel grounding grid was more close to the parameters of copper grounding grid. As a project example, the grounding parameters of copper grounding grid, copper-clad steel grounding grid, and steel grounding grid were calculated and compared, and these conclusions could be found, that copper-clad steel had excellent grounding performance and great economic advantages as grounding material.
2017, 4(1): 87-91.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.016
Abstract:
With the development of power grid Internet of Things (PIoT), more and more communication access networks are introduced in PIoT system. However, due to the overlapping coverage among heterogeneous networks, the existing QoS guarantee methods can not meet diversified requirements of multiple applications and challenges by network handover in future smart grid. This paper proposed a novel network access method for QoS guarantee by utility function. First, we designed a utility function evaluation model. Secondly, the network mapping algorithm of heterogeneous access networks was proposed. Finally, the performance and reliability of QoS guarantee method of heterogeneous access network were verified by simulations.
2017, 4(1): 92-95.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.017
Abstract:
High reliability active distribution network is based on strong network frame, and has ability of flexible network reconstruction and ability of coordinating and interacting among power source, grid and load. However, traditional distribution network are operated in open loop and designed in closed loop, and its protection method which are based on distribution automation and current differential protection can no longer meet the requirements for high reliability active distribution network. In this article, a high reliability distribution network model and its construction implementation plan is put forward, which includes distribution topology, Wide Area Measurement and Control System and requirements for distribution network automation terminal device type and so on. This model and plan offer a planning and construction support method for high reliability distribution network.
2017, 4(1): 96-101.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.018
Abstract:
According to distribution automation training and simulation requirements in our country, this paper puts forward a distribution automation training and simulation system adapted to multiple modes, which covers centralized control mode and local control mode of distribution automation, and it supports fault simulation and software simulation of training mode, the fault simulation mode can realize the operation process which is consistent with the real distribution automation system by interacting between master station system with distribution training terminals. The handheld training terminals are used to monitor distribution training terminals dynamically, and a full range of knowledge and experience for this training is provided, this can improve the effect of teaching and training effectively.
2017, 4(1): 102-104,108.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.019
Abstract:
Introduce a treatment method of dried and bituminization for radioactive spent resin. Radioactive spent resin is dried and reduced volume firstly, then mixed with headed bitumen, when cooled to get a bitumen product according national standards and with good quality. This method have benefit with simplification of process and equipment, facile operation, high factor of reducing volume, good quality of product, safety, and good for economy, which is a good treatment method for radioactive spent resin.
2017, 4(1): 105-108.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.020
Abstract:
With the concept of super low emission, the dust testing has got more difficult as the lower and lower concentration of power plant dust emission. In order to improve the accuracy of sampling and testing, we carried on comparison tests between different sampling mouth size and different sampling time, calculated the test deviation under different sampling volume, to find out a feasible optimization method. The results show that conventional dust sampling method can be optimized by increasing the sampling mouth diameter or prolonging the sampling time to increase sampling volume, when the sampling volume reached to more than 2m3, the accuracy of sampling and test results can be effectively improved. This work provides some reference for the establishment of low concentration dust sampling and testing standard in our country.
2017, 4(1): 109-112.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.021
Abstract:
With the adjustment of energy structure and the request of the low carbon economy in our country, the large nuclear power station and high parameter, large capacity thermal power station will become the main development direction of electric power industry. Circulating water system is the large consumption system of water and energy in power plant. In order to further implement the requirement of environmental protection in energy saving and consumption reducing, the process of large counter-flow natural draft high level water collection tower has been introduced. By understanding on high level water collection tower's functions and supporting system operation characteristics, meanwhile, the comprehensive economic comparison is analyzed under annual utilization hours. The results shown that large counter-flow natural draft high level water collection tower has a broad application prospect due to its advantages on remarkable energy saving, water saving and low noise.
2017, 4(1): 113-118,142.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.022
Abstract:
The method of numerical simulation was used to study the dynamic response characteristics of steel-aluminum foam-fiber composite structure under the action of impact load. The influence of different panel thickness and core layer thickness on the impact resistance of the composite structure was investigated emphatically to find the rule. Compared the influnce with diferent ratio of aluminum foam sandwich plate and front plate in composite structure, optimal mass ratio was marked to optimize the design. In this case, it can provide data basis for engineering practice. It is indicated that: (1) Within the scope of a certain quality, the composite structure with increasing steel plate perform better than aluminum foam in impact resistance. However, there was a optimal quality ratio between steel plates and aluminum foam. The optimal quality ratio was about 0.97: 1 with 120 tons composite structure with sice of 9.2 m×9.2 m; (2) The optimal quality ratio was about 0.75: 1 ~ 0.83: 1 with 150 tons composite structure. As the front steel plate is 9.5 cm and aluminum foam is 54 cm, the combination property was achieved to resist 300 m/s velocity projectile considered technological requirements and cost. In this way, its weight is only 1/5.67 and volume is only 17% of the reinforced concrete structure under a certain safety reserve, and it can perform better in impact resistance.
2017, 4(1): 119-124.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.023
Abstract:
With the development of UAV technique, it has become a trend to use it for transmission survey. However, it is important how to evaluate the survey quality and efficiency of UAV with 12 million pixel sensor. According the above problems, compared with the lidar data and engineering surveying data of a practical project of UHV transmission line, the quality of UAV data has been evaluated and the work method of UAV has been improved. Practice has proved that the improving method can offer a convenient, reliable, efficient way to gather data for UHV transmission line survey.
2017, 4(1): 125-128.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.024
Abstract:
Oil leakage of nuclear power generator has been the research object. We researched the gland seal principle and structure. Based on the analysis of some case, we got oil leakage treatment and preventive measures.The paper provided reference value and important guidance for the oil leakage problem.
2017, 4(1): 129-133,124.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.025
Abstract:
The first phase of a nuclear power plant APC shell structure is made of reinforced concrete pouring, it can resist the impact of the plane, and protects the security of nuclear power plant factory. APC shell structure span is large, and having greater thickness of the wall with no horizontal and vertical support, thus the pouring of concrete quality requirement is strict. According to the APC shell structure quality requirements, the cantilever jumping formwork for concrete pouring construction is used and a construction technology of cantilever climbing formwork system is developed. By using this technique, it can ensure the pouring concrete quality and the surface flatness of the concrete wall of APC shell, and speeds up the construction progress of the wall and save a lot of manpower and resources at the same time. It has good economic and social benefits.
2017, 4(1): 134-137.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.026
Abstract:
Benefits of smart grid come from the result of intelligent systems integration operation, previous studies are more concerned about the economic evaluation of the Taking the starting point of smart grid devices, investor, not the smart grid system modules and functions benefit linkage analysis. this paper takes full account of the explicit and implicit investment returns. Based on quantitative assessment index, a cost-effectiveness model is constructed to achieve a comprehensive investment benefit evaluation of smart distribution grid. Taking the investment of the smart distribution grid of Shenzhen Bay as an example, the validity and rationality of the model are verified.
2017, 4(1): 138-142.
doi: 10.16516/j.gedi.issn2095-8676.2017.01.027
Abstract:
The utilization of Operating Experience(OE) is the final objective of the integrated OE process, including both correct event cause analysis and effective corrective action determination as well as its implementation. This article proposed the method and practice of the NPP CAP effectiveness evaluation. The method is based on the quality elements of CAP development which could be used as the technical basis for NPP CAP effectiveness evaluation. The evaluation results in 2015 have shown that the overall quality is acceptable.Meanwhile, the article also summarize and analyze the practice of the CAP effectiveness review activity in TQNPP. Based on the analysis, improvement directions are concluded which can be used as the reference for continuous optimization of CAP effectiveness review.
