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RSS2020 Vol. 7, No. 4
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2020, 7(4): 1-10.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.001
Abstract:
Introduction Electrochemical power sources （batteries） have shown broad application prospects in the field of energy storage. To make reasonable use of the advantages of batteries， in-depth understanding of batteries is needed. Method Several kinds of the most representative batteries and their technical characteristics were reviewed in this article. Based on the current application status of batteries in the field of energy storage， the problems and propose countermeasures were investigated. Result The applications of batteries in the field of energy storage requires the further development of new dedicated energy storage batteries， the construction of battery management systems， and the design of hybrid energy storage strategies. These long-， medium-， and short-term approaches that combines theory with practice can improve the safety and economy of energy storage by chemical power storage. Conclusion Electrochemical energy storage has broad prospects in the improvement of power quality range from new energy consumption to peak and frequency regulation of the power grid. It is necessary to specifically formulate energy storage solutions according to work requirements in order to maximum the benefits.
2020, 7(4): 11-17.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.002
Abstract:
Introduction The paper aims to establish the profit model of generator-storage combined frequency regulation system and give the basis for battery storage power selection to determine the optimal capacity of battery storage. Method Based on the historical operation data of a power plant and market price in Guangdong Province， we simulated the participation of battery storage in frequency regulation and analyzed the influence of battery storage power selection on the performance and income of combined frequency regulation. Result The simulation results show that the battery storage system can greatly improve the frequency regulation income by enhancing the performance of the power unit and the mileage. With the increase of the battery storage power， the frequency regulation income gradually increases and then tends to be stable. Conclusion The impact of battery storage power on the performance and income is different due to the unit performance differences and operating conditions. This work provides that it is reasonable and feasible to determine the battery storage capacity through simulation calculation， which can provide reference for the optimization of battery storage capacity in subsequent projects.
2020, 7(4): 18-25.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.003
Abstract:
Introduction As offshore wind power is one of the mainstream forms of new energy， developing offshore wind power is critical in optimizing energy composition and coping with climate change， as well as cultivating new economic dynamo in Guangdong Province， one of the largest energy consumer and offshore wind energy owner by province. Method Further to summarizing offshore wind power development and outstanding issues， this paper identified the main industries and key fields in terms of theory and practice. Result The writer puts forward the distribution and role of the offshore wind farm industry in Guangdong， as well as the development approach based on technological innovation and elevating the competiveness by supplementing and reinforcing the industrial chain. Conclusion Finally， the writer comes up with recommendations on polices related to advancing Guangdong offshore wind power industry and general study conclusions.
2020, 7(4): 26-33.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.004
Abstract:
In the offshore wind turbine， as the connection form of the upper wind turbine and the steel pipe pile foundation， the grouted connections are widely used. In recent years， the power of wind turbines has become larger and larger， and higher requirements have been placed on the performance of the grouted connection. Method In this paper， the numerical analysis method was used. And the influence of the parameters of the grouted connection on its mechanical properties was analyzed. Based on the thickness of the grout tg， the ratio of height to distance of shear keys h/s and the ratio of length to diameter of the grouted connection L/Dp， the change of the load-displacement curve ， the variation of contact pressure distribution and the stress state was analyzed. Result The results of numerical analysis show that the changes of the three dimensional parameters tg， h/s and L/Dp of the grouted connections will affect its mechanical properties. Conclusion By analyzing the structural parameters of the grouted connections， it is of great significance to ensure its normal operation and guide the design work.
2020, 7(4): 34-40.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.005
Abstract:
Introduction According to the measured wave data of one year in the deep water area of Eastern Guangdong， this paper mainly studies the basic characteristics of annual waves in the sea area. Method Firstly， the eigenvalues of wave height and period were counted month by month， get the basic distribution characteristics of the whole year； Then made statistics for the wave direction， obtain the seasonal characteristics of wave direction； Furthermore， the joint distribution of wave height and period and the relationship between wave height and period were explored； Finally， the characteristics of typical typhoon waves were studied. Result The results showed that： （1） The annual average Hs is 1.52 m， the Hmax is 15.97 m， the highest mean value of Hs in December， January and February， the Hmax is caused by Typhoon Mangkhut； （2） Affected by monsoon season and tropical cyclone， the normal wave direction and strong wave direction are ENE and SE respectively； （3） The main wave type in the whole year is wind wave component， the correlation between wave height and period is fitted； （4） According to the measured data of typhoon wave of Mangkhut， both wave height and period have a significant increase and decrease process. Through wave spectrum analysis during the typhoon， it experienced the evolution from double-peaked spectrum to single-peaked spectrum， it shows that the wave type during typhoon is mainly wind-surge mixed wave， the peak value reached 96.74 m2/Hz at 6：00 on September 16， peak frequency is 0.07 Hz. Conclusion The research results of this paper can provides technical reference for the design of related marine engineering.
2020, 7(4): 41-47.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.006
Abstract:
Introduction The paper aims to study the transient stability of the wind power system and that how the injection of reactive power to the wind power system affects the stability. Method So we established the mathematic model of the wind power generator， the frequency converter， and a three-machine-nine-node power system model was constructed based on PSAT. We realized the the time simulation in condition of the three phase fault. Result Then we get the voltage and power angel figure of direct drive wind power system，double-fed wind power system and constant speed wind power system under different bus short circuit fault time. Conclusion It demonstrates that the wind power system has different stability based on different wind power generator， disturbance and duration.
2020, 7(4): 48-53.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.007
Abstract:
Introduction Aiming at the problems of relatively single perspective， inadequate quantitative and global analysis of existing research on hydropower absorption， this paper systematically studies the measures of Yunnan's surplus hydropower absorption， quantitatively analyses the situation of water releasing in the southern region in the future. Method This paper put forward the direction of Yunnan's surplus hydropower absorption， and defined the transmission capacity and margin of the west-to-east power transmission channel on this basis. Result Based on the principle of overall coordination， this paper purposefully puts forward two kinds of clean hydropower absorption measures， which are optimal utilization of existing channels and improvement of transmission capacity of Guangdong and Guangxi section. Conclusion This is the first time to achieve the coordination and unification of planning and dispatching operation links， and further improve the utilization efficiency and transmission benefit of the west-to-east power transmission in southern region.
2020, 7(4): 54-60.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.008
Abstract:
Introduction 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 research retrofitted Tianguang HVDC receiving end converter station for VSC-HVD， and expansion to 3 GW. Method Based on meeting the various operation modes of flexible DC transmission， facilitating capacity increase， adapting to the level of equipment research and development， and making full use of existing equipment and buildings to reduce the difficulty and cost of transformation. Research compared different converter valve topologies and submodule topologies， studied the setting of the start-up circuit， the electrical wiring of the DC field， and the type of interface transformer. Result Research and analysis show that the capacity-increasing transformation plan recommends the use of a 1.5 GW converter valve per pole， half bridge-full bridge submodule hybrid type， symmetrical bipolar wiring， start-up circuit set on the side of the valve， large transverse size connection transformer. Conclusion This research provides the ideas and methods for the transformation of existing of the existing LCC-HVDC converter station retrofit for VSC-HVDC converter station.
2020, 7(4): 61-66.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.009
Abstract:
Introduction The control and protection technology of DC microgrid plays an important role in ensuring the reliable and safe operation of DC microgrid. The paper aims to solve the key technologies in the design of DC micro-grid. Method DC bus topology selection， control strategy， and protection configuration scheme were discussed in the paper. Result The selection principle of DC bus topology structure， the control strategy process of DC micro-grid， protection zone and configuration are given in the paper. At the same time， the selection of DC transformer is analyzed and compared. Conclusion The method has been validated in national demonstration projects， and it has performed well since it was put into operation.
2020, 7(4): 67-74.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.010
Abstract:
Introduction With the development of flexible DC technology and more and more distributed generation and energy storage equipment connected to the grid， in order to better satisfy new energy access and development of urban smart distribution network， this paper assesses the reliability and economy of flexible DC distribution network. Method This paper calculated the reliability assessment of Flexible DC Distribution by Minimum Path Method and evaluated the economy， which selected the demonstration project in Zhuhai as the research object. Result With the localization and maturity of IGBT and IGCT devices， the economy and reliability of Flexible DC Distribution network will gradually be better than that of AC distribution network. Conclusion The relevant research results of this paper can provide important reference and foundation for the construction of flexible DC distribution Network projects in the future.
2020, 7(4): 75-80.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.011
Abstract:
Introduction In order to enhance the self-rescule ability under fire conditions of the 110 kV powder substation， a fire-fighting strategy is proposed based on the ubiquitous electric power internet of things （UEP-IoT） technology. Method The framework of its four layers， including perception layer， network layer， platform layer and application layer was presented. The methodology on how to arrange the fire detecors， fire-extinguishing installations as well as smart management platform were explained. A detailed scheme on how to bulid the fire control system based on UEP-IoT of the 110 kV outdoor substation was given as an example. Result By combing the wireless sensor technology and the central management platform， the system can realize multi-level alert and self-rescue for the protected substation. Conclusion The results from this study will provide a valuable sample for future substation fire-fighting system design.
2020, 7(4): 81-86.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.012
Abstract:
Introduction Based on the current grid management situation of power grid enterprises， this paper analyses the demands of grid management， and then designs the Grid Management System. This paper aims to provides references for the power grid enterprises to construct the grid management system. Method This paper researched the current situation of grid management， analyzed department needs of grid management， designed the functional and deployment architecture of Grid Management System. Result Through the research， demand analysis， design， it proves that the design result of Grid Management System provides the condition for the power grid enterprises to improve the ability of grid management. Conclusion The Grid Management System has advantages of display and lean management. This paper provides some guidance for the implementation of Grid Management System.
2020, 7(4): 87-92.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.013
Abstract:
Introduction To address the issue of decisions under nuclear emergency and nuclear accident consequence assessment of common concern at home and abroad， in this paper. Method Tracer experiment data set KINCAID and model validation and evaluation method MVK both used widely were reviewed. Model ARTM was evaluated using MVK. Result Statistical results show that： the simulation results of ARTM model are basically reliable. Conclusion The forecasts in 3 km indicate a tendency of underestimate， while the forecasts out of 5 km indicate a tendency of overestimate.
2020, 7(4): 93-97.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.014
Abstract:
Introduction Welding is one of the important basic industrial technoligies， which is related to the safe and stable operation of nuclear power equipment. Considering that the R&D technologies are not sufficient， the production and testing methods are not advanced， and the key welding materials， welding equipment and testing devices are imported， the nuclear power plant construction progress and development meet a large number of “bottleneck” issues. Method To learn the current development of nuclear power welding industry and diffenrence between the current technologies and the international advanced technologies， Shanghai Municipal Nuclear Power Office visited and investigated a large number of manufacturing enterprises， universities， research institutes and construction enterprises. Result Based on the market demands， it demonstrated that the enterprises in the nuclear industry relied on and supported each other， and the technical difficulties and research direction were found. Based on the nuclear industry base and responding to the state and local industry policies， it gives the scheme on application of efficient and reliable welding technology， welding materials， welding processes and testing. Conclusion It explores a new mode of mutual symbiosis and cooperation between the upstream and downstream enterprises of the nuclear industrial chain， and puts forward the path of promoting welding localization and intelligentize development in nuclear industry.
2020, 7(4): 98-101.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.015
Abstract:
Introduction The paper performs research on thermal system with double-deaerator in order to study the wide load technology of large capccity units. Method By using the comparative study，analyzed the system， plant layout and technique economics. Result The results show that the system is feasible in technology，for 1 000 MW unit，the heat rate of the double-turbine regeneration system with double-deaerator is lower 10 kJ/kWh~50 kJ/kWh than the double-turbine regeneration system with one-deaerator under different loads，saved 7 232 tons of coal per year，investment increased by 5.7 million yuan， the investment recovery period is about 2 years. Conclusion The system is suitable for high parameter units，this work provides some guidance for using the thermal system with double-deaerator in high parameter units.
2020, 7(4): 102-106.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.016
Abstract:
Introduction The ratio has become one of the main indicators for controlling the building capacity in power plant construction， but its calculation principle， calculation method and prescribed control indicators are partially missing and unreasonable. Therfore， it is necessary to summarize the existing problems， analyze the calculation criteria and control indicators， and propose its improved ideas and methods. Method By comparing the current national and local relevant laws and regulations， different industry norms and standards in the manufacturing industry， combined with the current customary practices of the power plant， also by comparing the actual project volume ratio construction data， comprehensive solutions were proposed from various aspects such as technology and policy. Result Provinces and cities may formulate and improve the power plant volume ratio index， in order to provide a clearer indicators for implementation. Super high-rise buildings are calculated multiple times in the ratio， which can reflect the building type and scale of power plant buildings more realistically. The ratio of different types power plant are considered to be subdivided， which is conducive to docking with current industry practices and conducive to refined design. Conclusion Comprehensive suggestions are made from the aspects of policy index setting， industry customary practice docking， and technical solution selection， which are of practical significance for solving the volume ratio problems commonly encountered in power plant construction today， and can provide guidance for practical applications.
2020, 7(4): 107-112.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.017
Abstract:
Introduction Safety is an eternal theme in the electric power industry. Safety instrument system is one of the most important means to ensure the unit safety. Internationally， safety instrument system has a relatively mature standard system and has been widely used. However， the application in domestic thermal power industry is in the exploration stage. In order to promote the application of safety instrument system in power industry， this paper will describe its practical application cases in thermal power secondary reheat units， and provide reference for the design， procurement and operation maintenance of other thermal power plant projects. Method Firstly， the relevant international standard were introduced and analyzed in detail. Then using risk chart method to analyze the safety integrity level of secondary reheat 1 000 MW power plant project. Result By analyzing safety integrity level and applying it to equipment bidding， design， commissioning and operation of secondary reheat 1 000 MW power plant， the safety and stability of power plant operation were effectively improved. Conclusion The analysis of the unit safety instrument system in the early stage of power plant project is beneficial to the management and design process of the whole life cycle of power plants， which should be widely used in the power industry.
2020, 7(4): 113-119.
doi: 10.16516/j.gedi.issn2095-8676.2020.04.018
Abstract:
Introduction The purpose of this paper is finding out the differences in the calculation of concrete road structure between Chinese codes and American codes， looking for the possibility of Chinese code to replace American code in the calculation of concrete road structure， making Chinese codes more widely used in the world. Method We compared the theoretical principles and design process of concrete road design between Chinese codes and American codes， then the same project example is calculated by the methods of Chinese codes and American codes respectively， and we compared the result and got a conclusion. Result After comparison， we find that the results calculated by Chinese codes and American codes are very close， Chinese codes are more conservative that can increase the life of concrete roads. Conclusion In the concrete road design of foreign projects， Chinese codes can replace American coads. We can use Chinese codes boldly， and help them to go to the world.
2020, 7(4): 120-126.
Abstract:
