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RSS2023 Vol. 10, No. S1
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2023, 10(S1): 1-9.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.001
Abstract:
Introduction Digital power grid is a brand new concept and the best bearing mode of new power system. In the digital transformation, power grid enterprises are committed to constucting a digital power grid. Digital power grid is different from traditional smart power grid. It is necessary to measure the development level of digital power grid from a macro perspective. Therefore, it is necessary to build a new digital power grid comprehensive index to guide power grid enterprises to construct the digital power grid, and analyze the shortcomings in the construction. Method Based on the analysis of the key components of digital power grid development index, a digital power grid index evaluation system was established to select the core indicators of digital power grid. First, the key indicators at all levels were weighted, and then a digital power grid development index model was constructed based on fuzzy theory. Result Three power grid companies subordinate to China Southern Power Grid are selected for case study. The analysis results show that the overall development index of digital power grid is not high, and there is broad development space in various fields other than ontology security index. Conclusion Based on this method, the development status and future development trend of digital power grid of power grid enterprises can be effectively estimated.
2023, 10(S1): 10-16.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.002
Abstract:
Introduction Power supply reliability is one of the important evaluation index of power supply company. The paper aIms to analyze the implementation effect of different power supply reliability improvement measures in distribution network, so it is necessary toaccurately locate the main influencing factors of improving the power supply reliability of distribution network. Method Based on the traditional reliability estimation method of distribution network, the paper fully considered the influence of distribution automation and power transfer capability of distribution network, and proposed a sensitivity calculation method of power supply reliability influencing factors. Result The paper buildt typical rural and urban distribution grids, and carried out sensitivity calculation and analysis of factors affecting power supply reliability. Conclusion The paper fully considered the main factors affecting power supply reliability and the influence mechanism, which can provide technical direction guidance for power supply reliability planning and distribution network upgrading.
2023, 10(S1): 17-26.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.003
Abstract:
Introduction This paper aims to improve the new power system under the background of "carbon peak and carbon neutrality". Method This paper made potential assessment and demand forecasting of different types of renewable energy, and further analyzed their constraints. Result It is concluded that photovoltaic power and wind power are the main forces of the new power system, the development of non-water renewable energy is affected by resources and sites, grid access and consumption, economical efficiency, investment willingness, local government support and other factors. Conclusion It is suggested that carries out targeted planning of non-water renewable energy, improves grid structure and optimizes system operation in advance, promotes the reform of the electric power system, improves the electricity market system, and establishes an incentive mechanism to encourage local governments to develop renewable energy.
2023, 10(S1): 27-33.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.004
Abstract:
Introduction Under the goal of carbon peaking and carbon neutralization, building a new power system has become a realistic path of electric power development. As a flexible regulatory resource, stored energy plays an important role in improving the efficiency of power grid operation and the new energy consumption. In order to improve the flexibility of the power system and promote the coordinated and efficient development of power source, power grid, load and energy storage, it is necessary to identify the role of stored energy in different scenarios in accordance with the characteristics of stored energy technology and the actual needs in all aspects of the power system. Method Based on the development status of the stored energy industry, the application scenarios and development potential of different stored energy technologies were analyzed, and the strategies of stored energy configuration on the grid side, power supply side and user side were proposed. The impact of stored energy was studied from the perspectives of substation design, grid planning, power balance and new energy consumption. Result From the perspective of the power grid side, stored energy can improve the power supply capacity of power grid and delay or replace the power grid investment; from the perspective of the power supply side, the access of stored energy has an impact on the power balance, and the consumption level of new energy can be improved by optimizing the configuration of stored energy. Conclusion As a supporting technology for the development of new power systems, stored energy will play a greater role. The stored energy configuration strategy proposed in this paper can provide guidance for practical application.
2023, 10(S1): 34-37.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.005
Abstract:
Introduction In order to better promote the development of deep sea offshore wind power projects, the paper starts from the composition of offshore wind power investment. Method Based on perspective of project lifecycle cost and the method of LCOE, the paper proposed the main path and methods for cost reduction and efficiency enhancement of offshore wind power. Result Finally, combined with a case study in Guangdong sea area, the paper verifies the effectiveness of the cost reduction and efficiency enhancement path for offshore wind power. Conclusion The results indicate that continuous technological breakthroughs in core areas and continuous improvement of the industrial chain are the keys to reducing costs and increasing efficiency in deep sea offshore wind power projects.
2023, 10(S1): 38-46.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.006
Abstract:
Introduction The purpose of this paper is to optimize the schedule management idea of offshore wind power projects, coordinate the resources in the management process, properly develop the top-level design of offshore wind power project management, grasp the key path in schedule management, effectively promote the project progress, help pool the resources to resolve risks, avoid or reduce construction delay, and improve the ability to manage the offshore wind power projects. Method This paper analyzed and summarized the key work contents and key nodes in the course of the construction of offshore wind power projects by collecting and analyzing the practical construction experience of offshore wind power projects in various domestic sea areas combined with critical path theory in the project management. Besides, it also summarized the time required for performing the key procedure in the course of the project construction according to the actual situation of offshore wind power projects in Guangdong so as to verify the accuracy of relevant process timing and the importance of key procedure. Result The results show that the critical path of offshore wind power project construction includes the delivery line, centralized control center, main submarine cable production and laying, step-up substation (converter station) construction, first loop foundation manufacturing and construction, fan manufacturing and hoisting, branch cable production and laying, grid connection debugging and defects elimination. The cores of schedule planning are as follows: On the premise of the overall construction sequence planning, properly match the survey and design, foundation engineering, fan engineering and submarine cable engineering throughout the process, control the time required for performing each key procedure, and promptly take appropriate corrective actions to manage the schedule, so as to control the overall project schedule. Among them, the time required for performing each key procedure has practical reference significance for the early planning of Guangdong offshore wind power projects. Conclusion The research results can be used as a reference for the schedule management of similar projects in Guangdong sea area.
2023, 10(S1): 47-50.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.007
Abstract:
Introduction Rapid development of offshore wind power is around the corner in Guangdong Province. However, the lag of financial subsidies and uncertainty of electricity prices will affect the economic benefits of offshore wind power projects. Method Four typical offshore wind power projects in Guangdong Province were selected to calculate the impact of subsidy payment lag by one year, two years and three years on the financial internal rate of return (FIRR) of the projects. Result The calculation result shows that the payment lag of financial subsidies and electricity price have a great impact on the economy of the projects. Conclusion It is suggested that the analysis of sensitive factors such as subsidy payment lag and electricity price uncertainty should be additionally considered in the early decision-making stage of offshore wind power projects.
2023, 10(S1): 51-57.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.008
Abstract:
Introduction According to the planning of national energy strategy, green energy is vigorously developed, and there is a growing trend of constructing offshore wind power projects in the form of EPC general contracting. How to properly manage risks in the implementation process is of great significance to the construction of offshore wind power projects. Traditional risk identification methods have some problems such as strong subjectivity, incomprehensive and unsystematic analyses. Method This paper proposed a working model of risk identification, risk prediction and risk response based on WBS and summarized and applied it in an offshore wind power EPC general contracting project. Result The results show that the WBS-based offshore wind power project risk management model can analyze the project risks in a more comprehensive and systematic way. Conclusion It can guide and remind the main persons in charge of project management about the project priorities at different stages so that they can take effective risk prevention measures to reduce the project risks and costs and promote the overall progress of the project.
2023, 10(S1): 58-63.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.009
Abstract:
Introduction The development of nuclear power is an important measure to build a new low-carbon power system with clean energy as the main body in China. The research and development of super-large seawater cooling towers suitable for nuclear power plants can greatly expand the site resources of nuclear power plants. Method The super large seawater cooling tower of nuclear power plant was a special structure, and its stress calculation belonged to three-dimensional space curved surface structure, and the section control was usually performed by the combination of wind loads. The maximum wind speed and design wind pressure of super-large seawater cooling tower in nuclear power plant were studied based on the engineering example of cooling tower design in nuclear power plant. Result The suggestion and analysis method of design wind pressure value of cooling tower in nuclear power plants are put forward. Conclusion The research can expand the resource reserve of nuclear power plant site.
2023, 10(S1): 64-67.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.010
Abstract:
Introduction The operating pressure of the storage tank of the auxiliary feedwater system (ASG) in nuclear power plant is stabilized within the designed pressure range through the combined action of the back pressure control valve and the breathing valve. Abnormal pressure, overpressure or negative pressure deformation in the storage tank will affect the normal operation of the system and cause the failure of the safety function of the system. The performance of the back pressure control valve and breathing valve is very important. Based on the analysis of the existing problems, the back pressure control valve and breathing valve are improved to ensure the pressure stability of the pressure storage tank. Method According to the actual operation experience, the structure of the back pressure control valve and the breathing valve were compared, and the two kinds of valves were improved from the valve structure, sealing type, etc. Results The performance of the improved equipment was stable and no abnormal phenomena such as over-high pressure alarm occurred during use. Conclusion The improved back pressure control valve and breathing valve have been widely used in practical projects, providing certain identification for the subsequent treatment of similar valve problems.
2023, 10(S1): 68-73.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.011
Abstract:
Introduction As a major economic province in China, Guangdong Province ranks first in both natural gas consumption and installed capacity of natural gas power generation, and has its unique development laws and characteristics for natural gas power generation. In recent years, with the centralized construction and operation of natural gas power generation units in the Pearl River Delta and the iteration of natural gas engine power equipment in new power plants, the problems of insufficient gas supply pressure, resource shortage, and mismatch between the gas and electricity markets in Guangdong Province have become increasingly severe. Further research is required on the synergistic relationship between the development of natural gas power generation and the construction of natural gas production, supply, storage, and sales systems, to coordinate power generation and gas consumption, and ensure the safe supply of energy in Guangdong. Further research is needed on the synergistic relationship between the development of natural gas power generation and the construction of natural gas production, supply, storage, and sales system, and to coordinate power generation and gas consumption, so that the supply security of energy can be ensured in Guangdong. Method The Research focused on the progress of natural gas production, supply and storage system construction and natural gas power generation in Guangdong Province, further analyzed the contradiction between natural gas power generation demand and natural gas resource supply, natural gas pipeline network construction, etc. in the Pearl River Delta region, and proposed suggestions for natural gas power generation planning layout and infrastructure development. Result The Research shows that with the country's emphasis on low-carbon development, the environmental value of natural gas power generation will become more apparent. Guangdong Province's natural gas power generation still has good development space and prospects, but it is particularly important to handle the relationship between "gas" and "electricity". Natural gas power generation, as an important component of the construction of a new power system in Guangdong Province, should be based on the improvement of natural gas supply and infrastructure. Conclusion Coordinating the development positioning, planning layout, development scale, and implementation path of natural gas power generation, and accelerating the construction of natural gas production, supply, storage, and sales system are effective measures to ensure the development of natural gas power generation in Guangdong.
2023, 10(S1): 74-80.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.012
Abstract:
Introduction Aeration fan is an important equipment in the desulfurization wastewater pretreatment system of thermal power plant. It is generally used as the gas supply source for the aeration device in the aeration tank. Therefore, the reliability of the aeration fan directly affects the stability of the desulfurization wastewater pretreatment system. Methods This paper mainly described the characteristics and process of desulfurization wastewater pretreatment, thoroughly analyzed the common problems existing in the aeration device with a practical case, and finally determined the technical scheme of replacing the aeration device with a reasonably arranged top entry agitator. Result By analyzing the desulfurization wastewater index, sludge deposition and economical efficiency before and after the transformation, it shows that the technical transformation not only can successfully solve the problem of frequent sludge deposition in the aeration tank, reduce the operation and maintenance costs by 85.29% compared with the original aeration device and bring down the auxiliary power cost by 52.78% but also can improve the stability of the desulfurization wastewater pretreatment system operation. Conclusion It has a high reference value for solving the problems existing in the same type of desulfurization wastewater aeration device.
2023, 10(S1): 81-87.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.013
Abstract:
Introduction In order to reduce the energy consumption of the ventilation and air-conditioning system, a parameter selection method for the evaporative cooling ventilation system suitable for the high temperature workshop of a power plant in a hot and humid area is proposed, and the analysis is combined with the design example. Method The basis for selecting outdoor parameters of evaporative cooling was determined through the comparison of outdoor hourly parameters and theoretical analysis, and on this basis, a method for determining outdoor parameters of evaporative cooling system was proposed. At the same time, an example of the design of the cooling and ventilation system in the inverter room of a power plant in a hot and humid area was analyzed. Result The results show that the evaporative cooling system is feasible for cooling and ventilation in a high temperature workshop in a hot and humid area, and the system operation effect shows that its energy saving effect is significant. Conclusion The proposed parameter selection method is correct and effective, and can provide guidance for practical engineering application.
2023, 10(S1): 88-93.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.014
Abstract:
Introduction In order to solve the problem that the field opening of boiler bellows baffle actuator in Unit 1 of Zhuhai power plant lacks remote monitoring, and that the field opening of the actuator often does not correspond to the instruction, we need to transform and optimize the actuator of boiler bellows baffle. Method A batch of matching cylinder, instrument, air source pipe, intelligent positioner and other equipment is introduced to work on the following two aspects: on the one hand, related mechanical professionals dealt with the valve jam; on the other hand, the pneumatic control system of boiler secondary throttle was transformed, and the positioner was replaced by the current mainstream intelligent positioner, and the split type transformation is adopted. Result After replacing the cylinder and other equipment and adopting the split intelligent positioner, the unit was put into normal operation again, which fully and effectively solved the problems such as jamming and unstable actuator action, and reduced the maintenance work and maintenance cost. At the same time, the control process of the boiler bellow actuator was more efficient, and the feedback of the field opening and the control of the instruction were more accurate and timely. And the adaptability to harsh operating conditions on site became stronger. Conclusion The transformation of split intelligent positioner makes up for the defects of traditional control mode, and is the optimal solution among various control modes at present.
2023, 10(S1): 94-97.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.015
Abstract:
Introduction The fresh water consumption of 2 × 1000 MW coal-fired units is about more than 500 tons per hour, and how to obtain this part of fresh water is very important for the safe and economic operation of power plants. Method In this paper, several fresh water supply schemes for coastal power plants were compared and analyzed from the aspects of technology and economy, aiming to provide some suggestions for the decision making of fresh water schemes under specific boundary conditions. Result Through the discussion of this paper, it is found that the water supply cost of tap water supply scheme is low, but there are some problems such as water intake agreement, land acquisition of water pipeline. Although seawater desalination saves fresh water resources and has good social benefits, it requires high investment, heavy operation and maintenance workload, high operation cost and high water supply cost. Conclusion The two fresh water supply schemes are feasible, and it is suggested that tap water should be used as the fresh water source of the power plant when sufficient tap water is available.
2023, 10(S1): 98-104.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.016
Abstract:
Introduction Traditional distributed control system (DCS) has many problems, such as single monitoring screen, repeated alarm, and inability to support advanced algorithms. With the development of digital technology, various manufacturers have developed new intelligent control systems. Through the analysis of the scheme of application of the intelligent control system to a 1 000 MW ultra-supercritical secondary reheating unit, this paper provides effective reference for the application of the intelligent control system to new power plants. Method Based on the traditional DCS, the intelligent control system adopted a new hardware architecture, adding intelligent controller, advanced application service network, high-performance timing database and advanced application server, forming a set of basic platform with high computing power, high real-time performance and high open development environment. The needs of the integrated operation control of the unit were met by applying intelligent monitoring panel, intelligent alarm, predictive control of unit coordination optimization, intelligent soot optimization system and other intelligent applications in the intelligent control system. Result Through the application of intelligent control system and advanced algorithm, the intelligent level of the unit was greatly improved. Conclusion With the gradual promotion and successful implementation of the intelligent control system in the power generation industry, the intelligent control system is increasingly mature, and all kinds of intelligent applications will be increasingly rich and mature, directing the development of the future production control system.
2023, 10(S1): 105-109.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.017
Abstract:
Introduction This paper introduces the intelligent site safety management system of an ice storage project to realize the intelligent and information safety management in the whole construction process of the project with advanced management methods, which not only improves the application of informatization of the project safety management and supervision system, solves various information islands and safety management vulnerabilities, but also improves the work safety and efficiency on the construction site. Methods The intelligent site safety management system realized the centralization, visualization and digitized management of data processing on the safety management information platform with more advanced technologies, etc. It effectively integrated high technology into the core business of work safety in various construction projects to build a standardized, reliable, scientific and reasonable site management platform system. Results Various purposes have been realized, such as access control, real-name system attendance management, safety protection facility management, safety experience, safety education and training management, site video monitoring, UAV patrol monitoring, environmental monitoring, collaboration, basic data management, statistical analysis, information reporting and release, so as to achieve safe and intelligent construction site management. Conclusion The practice shows that the application of the system plays a good role in strengthening the management and control of the construction site during the construction of the ice storage project, promoting cooperation between the upstream and downstream of the intelligent management system, comprehensively promoting the interconnection of all subsystems, and building a visual and intelligent big data management platform. It lays a foundation for safety management throughout the life cycle of the project construction and integration of site safety management and control, and also provides a new safety management model for the peer to learn from, and can be widely promoted.
2023, 10(S1): 110-116.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.018
Abstract:
Introduction In order to implement the "Notice on Accelerating the Digital Transformation of State-owned Enterprises" issued by the State-owned Assets Supervision and Administration Commission, state-owned enterprises are facing the pressure and challenge of digital transformation. Many power engineering enterprises are exploring the direction of digital transformation, and it is an important prerequisite to solve the management of engineering project life cycle data by using digital technologies such as cloud computing, big data, Internet of Things, mobile Internet, artificial intelligence. Method In view of the large volume, diversity and complexity of the whole life cycle data of power engineering projects, this paper analyzed the inapplicability of relational databases in most scenarios, and used the MongoDB, the NoSQL database, to solve the problems of large volume, diversity and complexity of data. Result The author designs and constructs engineering big data platform using MongoDB as the core database, which realizes the flexible modeling and management of the process data of power engineering projects, and serves as the data base of the digital products in the whole process of the engineering project. Conclusion The research has proved that MongoDB database is more suitable for scenarios with large data volume, data diversity, and complexity than relational database, with higher storage efficiency and stronger data query and statistical capabilities in practical applications.
2023, 10(S1): 117-122.
doi: 10.16516/j.gedi.issn2095-8676.2023.S1.019
Abstract:
Introduction To achieve intelligent and refined management during the construction period of power generation projects, various types of Internet of Things (IoT) devices have been used to replace traditional operation methods, and the construction of intelligent construction sites has become a breakthrough and focus point for accelerating the transformation and upgrading of construction methods. Method To be geared to the actual needs of site management of power generation project projects, an intelligent construction site platform that supports construction site management, information sharing, interconnection and collaboration and intelligent decision-making was built based on the deep integration of digital technology and construction sites. Result The study reduces site safety risks, improves construction quality, and thus becomes an important path to boost the high-quality development of GEDI projects during the construction period. Conclusion This study realizes the rapid derivation model of generating multiple project-level intelligent construction site systems from one enterprise-level intelligent construction site platform and provides strong support services for the management of personnel, equipment, safety, quality and schedule of multiple projects as well as some reference for the construction of intelligent construction sites for similar projects.
