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RSS2022 Vol. 9, No. S1
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2022, 9(S1): 1-8.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.001
Abstract:
Introduction Improving energy efficiency is an important path to achieve low-carbon energy transition. The development of multi-energy complementary (MEC) projects has great significance to China's energy transition. How to ensure the sustainable development of MEC projects through business model innovation has become a research hotspot. Method Based on the different application scenarios of urban functional areas, the corresponding relationships among load types, general energy demand and typical energy allocation were constructed, and the research on project investment mode, operation mode and profit mode was carried out based on the existing power market, demand side response market and carbon emission right market . Result Three business models of assets, service and operation of MEC projects adapted to different urban functional areas are proposed, which enhance the feasibility and extensiveness of the business model. Conclusion The research provides a reference for the planning and configuration of MEC projects in different scenarios and comprehensively expands the market types and profit sources that MEC projects can participate in, providing an important reference for the sustainable development of the project.
2022, 9(S1): 9-16.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.002
Abstract:
Introduction In order to achieve the national goal of "carbon peak and neutrality" as soon as possible, Method this paper actively improved the current wind power and photoelectric complementary units, innovated and developed the hydropower storage and power generation unit, introduced the hydrogen energy power generation unit and the super capacitor parallel lithium and sodium battery power storage unit, and combined the five elements with the programmable controller ( industrial control computer PLC ), LM358 operational amplifier, power relay and solid-state power relay as the core to make up for each other's strong points, and jointly formed the "open" system for the manufacturing and production of new renewable energy. Result The system can be popularized as a new type of universal energy saving equipment, which can meet the all-round needs of users' versatility and particularity. Conclusion The wind-solar-water-hydrogen-storage integrated complementary renewable energy manufacturing system can be a pioneer in achieving the goal of "carbon peak and neutrality".
2022, 9(S1): 17-23.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.003
Abstract:
Introduction With the advancement of carbon peak and neutrality, the new power system will gradually form. The new power system is mainly composed of wind power and photovoltaic power generation. Due to the volatility, randomness and intermittence of wind power and photovoltaic power generation, the "real-time balance and stable operation" necessary for the power system will face unprecedented problems. To solve this problem, the fundamental way is to scale, market-oriented energy storage technology. Method Based on China's energy development situation, energy storage solutions were emphatically discussed, and six technical routes of the two types of energy storage were analyzed from four aspects of technical feasibility, market feasibility, resource satisfaction rate and scale prospect. Results From the current technical level, only pumped storage, chemical energy storage and hydrogen energy storage have the technical feasibility, economic marketization and prospect of scale. The energy storage measures that can be widely used are chemical battery energy storage and pumped storage, and the three application scenarios of pumped storage power station, chemical battery energy storage power station and power exchange station. In the face of the problem of real-time balance of supply and demand in the "real-time balance and stable operation", the solution should be based on the combination of pumped storage power station, chemical energy storage power station, switching power station and wind-solar redundant installed machine, and other energy storage and adjustment measures should be supplemented. Conclusion The new energy and energy storage industry will usher in an era of rapid development. The new power system energy storage solution proposed in this paper has important theoretical significance for the realization of the carbon peak and neutrality.
2022, 9(S1): 24-29.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.004
Abstract:
Introduction In order to meet the needs of digital and intelligent transformation of power enterprises and to adapt the strict requirements of new power plants on safety and quality management of engineering construction, Method an intelligent site management system was put forward and its construction scheme , functional module, and reasonable transition scheme to production period were introduced. Result The intelligent site management system based on Internet of things, big data, cloud platform technology, and intelligent terminal equipment can realize the comprehensive management and control of personnel, facilities, environment, and management. Conclusion The intelligent site management system proposed in this paper can effectively improve the management efficiency and intelligent level of power enterprises, and also provide a reference for the construction site management mode of new power plants.
2022, 9(S1): 30-35.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.005
Abstract:
Introduction At present, the traditional power infrastructure operation and maintenance management system has a low degree of refinement and visualization.In order to improve the quality and efficiency of operation and maintenance management, Method this paper studied and proposed a power infrastructure operation and maintenance management method based on Building Information Modeling (BIM) visualization and information technology.In order to realize the operation and maintenance management method, the existing system architecture was flattened, and the BIM model was defined as the core data carrier.The peripheral system with an independent database could directly extract BIM data or display the BIM model. Result The actual project shows that using BIM visualization and information technology to effectively improve the level of infrastructure operation and maintenance management. Conclusion The proposed BIM-based power infrastructure operation and maintenance management system can be further used in actual projects.
2022, 9(S1): 36-42.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.006
Abstract:
Introduction Liquefied natural gas (LNG) terminal usually consume a lot of water resources and electric power to gasify and transport the gas. Reasonable selection of water intake and drainage schemes is of great significance to save energy and reduce carbon emissions. Method In order to make full use of the thermal drainage resources from the neighboring existing power plants, three different water intake and drainage schemes were proposed: Simultaneously draw and drain water from the ocean, simultaneously draw and drain water from the power plant open channel, and draw water from the power plant open channel and drain water to the ocean. All water intake and drainage schemes were compared and discussed on their engineering construction schemes, economic, and social benefits, etc. Result The results of the comparison and selection of the schemes show that compared with the traditional scheme of taking and drainage water from the ocean, those of taking water from the power plant could reduce the infrastructure investment by about 5.6%, reduce the water consumption of open rack vaporizer (ORV) by about 41%, and save about 5.471 million kWh of annual operating power consumption, which was equivalent to reducing carbon dioxide emissions from 1 000 MW ultra-supercritical generator sets by at least 3 548.3 tons per year. In addition, this water intake and drainage scheme also greatly saves the sea area and reduces the impact of water intake and drainage on marine ecology. Conclusion The new water intake and drainage scheme proposed in this study has good social, economic, and environmental benefits and provides some guidance for other projects to fully integrate energy, further improves energy and water conservation, and reduces carbon emissions from LNG terminal.
2022, 9(S1): 43-49.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.007
Abstract:
Introduction With the promotion of comprehensive utilization of natural gas and the encouragement of clean energy power generation, the construction of large combined-cycle power plant is one of the important forms to achieve this goal. Method In this paper, through case study, scheme formulation, analysis and summary, the design philosophy to meet water consumption index of large combined-cycle peak-regulation power plant in south China was studied and discussed: The water source characteristics and design difficulties of the project were analyzed, the water-saving design scheme was formulated, the water balance was calculated, and other water-saving design ideas were discussed. Result In order to meet the increasingly stringent requirements of water consumption index, large circulation cooling combined-cycle peak-regulation power plant in South China should consider the water source characteristics, selection of concentration ratio of cooling tower and reuse of cooling tower discharge water based on the site conditions of the project, and formulate appropriate design schemes to ensure the realization of water-saving goal. Conclusion The research can provide design philosophy for the same type plants to meet water comsuption index.
2022, 9(S1): 50-55.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.008
Abstract:
Introduction There are deviations in the design, manufacture and installation of the four major pipes building. These deviations have not caused great influence in the previous projects construction process, and are often easily ignored. With the optimization of the layout, the normal operating of the pipeline may be affected when various deviation trends are consistent, which needs to be studied. Method We analyzed various common deviations between theoretical calculation and practical operation from the point of view of design, and we analyzed the influencing process of deviations in previous project. Result The analysis results show that these neglected common deviations may affect the normal operation of the unit. Conclusion The deviation between theoretical calculation and practical operation cannot be completely avoided, so it is necessary to pay enough attention to design, manufacturing and installation, feedback timely , control the impact of the deviation.
2022, 9(S1): 56-62.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.009
Abstract:
Introduction Demister is an important equipment in wet desulfurization system. It is generally installed on the top of desulfurization tower to capture gypsum droplets entrained in flue gas after desulfurization, so as to reduce the probability of "gypsum rain" and reduce the damage of "gypsum rain" to surrounding equipment, facilities and buildings. Methods This paper mainly introduced the structure and characteristics of ridge mist eliminator and water droplet like tubular mist eliminator, analyzed the causes of collapse of tubular mist eliminator in thermal power plant with practical cases, put forward practical improvement measures, and accumulated technical experience, so as to improve its safety and stability. Result The actual monitoring data show that the technology of super low emission in thermal power plants has advantages and advanced nature, and has a wider application prospect and value, so as to effectively enhance the reliability of the desulfurization system. Conclusion Provide reference value and research direction for subsequent transformation units or relevant technicians, so as to effectively ensure the economic and social benefits of relevant technological transformation.
2022, 9(S1): 63-68.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.010
Abstract:
Introduction The imported boiler tertiary superheater of Zhuhai power station which was designed and manufactured by Mitsubishi Heavy Industries has occurred tube failures frequently in recent years, the types were typical long-term overheating failures, the metallographic spheroidization were occurred and mechanical properties were declined, indicating that the furnace tube was in a long-term high temperature operation state. Method To find out the reasons of long-term overheating and to propose solutions, the thickness of oxide of tertiary superheater tubes was tested, the flow deviation and heat absorption deviation of tertiary superheater were studied. Result The residual creep life of 59% T91 tubes were less than fifty thousand hours, 39% T91 tubes were less than ten thousand hours, the residual creep life of 25% T23 tubes were less than fifty thousand hours, 9% T23 tubes were less than ten thousands hours. The flow deviation of the superheater header was 10.6%, the heat deviation of the tubes temperature in the width direction was 60 ℃. The problem couldn't be solved by replacing the new pipe section, the overall design Modification was required. Conclusion According to the above researches, the modification design by China-manufacturer was proposed. After the modification the flow deviation of the superheater header was reduced to 2.24% and the heat deviation of the tubes temperature in the width direction was reduced to 40 ℃. In addition, considering the working environment of the tertiary superheater, properties of the tube materials had been upgraded, the types of the material were reduced from 5 to 4, and the specification were reduced from 23 to 12, the procurement and maintenance costs were reduced.
2022, 9(S1): 69-75.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.011
Abstract:
Introduction The paper aims to sovle the sub-grade problems cause by complex karst and soil cave foundation, design problems in karst and soil cave foundation treatment design, construction problems often occurred in power plant projects, such as advanced drilling, bored pile and PHC pile construction difficult problems etc.. Method To describe the relevant karst and soil cave treatment key technologies, including treatment principles, treatment methods (including filling method, crossing method, pile foundation method), we analyzed and compared the relevant specifications, costs and practical engineering experience. Results The results we obtained is the solutions to the difficult problems in the treatment of karst and soil cavern foundation and the problems that are easy to occur in the punching construction of pile foundation of karst cavern foundation and the emergency response plan. Conclusion Finally, several treatment methods of karst foundation in power plant are suggesed, which can be used as reference for similar projects.
2022, 9(S1): 76-82.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.012
Abstract:
Introduction With wind power entering the era of parity, the design optimization of fan foundation reinforcement is of great significance. Method In a practical engineering case, the CFD foundation design software was used for structural design. Then, the finite element model of wind turbine foundation was established by ABAQUS software. Result The analysis shows that, the position of the inner end of the radial reinforcement and the inner ring of the circumferential reinforcement are the positions of the maximum stress in the reinforcement system. Through analysis, the problems existing in the reinforcement calculation of traditional design method are found. Reinforcement optimization is summarized and compared with the original reinforcement scheme. Conclusion The optimization range of radial reinforcement and circumferential reinforcement is more than 10%. These conclusions can be used to guide engineers for design optimization.
2022, 9(S1): 83-91.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.013
Abstract:
Introduction The transient enclosure voltage (TEV) will threaten the personal safety of the staff and the normal operation of the secondary equipment, and may cause the discharge between the flanges of the GIS enclosure. In order to analyze the spark discharge fault between the flanges of the GIS enclosure when operating the disconnecting switch in a 500 kV substation, a TEV simulation calculation model based on the transmission line theory was proposed, and the suppression measures of the discharge between the flanges caused by TEV were discussed. Method In order to simulate the TEV more accurately, an improved dynamic arc model was constructed using the Cassie-Mayr theory, and the VFTO generation circuit was combined with the TEV calculation circuit, and the VFTO generated by disconnecting switch operation was directly added to the GIS enclosure potential calculation model. Result The simulation results show that, in the worst case, the maximum voltage difference between flanges exceeds the surface flashover voltage of insulating barriers between flanges, which is enough to cause discharge between flanges. Reducing the residual charge on the island side of the disconnecting switch and reducing the inductance of the grounding wire can reduce the amplitude of TEV to varying degrees, but cannot completely suppress the potential difference between the flanges. The use of shorting connectors for bridging can effectively suppress the voltage difference between the flanges and avoid the resulting discharge phenomenon, but it is necessary to verify the selection of the shorting pieces and cancel the original three-phase shorting row to avoid circulation. Conclusion Verified by on-site engineering transformation, the conclusions obtained in this paper are correct and effective, and have great reference significance for preventing such discharge phenomena.
2022, 9(S1): 92-98.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.014
Abstract:
Introduction With the rapid expansion of the city, underground municipal engineering construction has been widely used. Underground municipal engineering has special requirements such as complex construction technology, wide space volume and installation limitation of process equipment. Method According to the above characteristics, combining with the relevant specification requirements and engineering examples, this paper expounded the current underground municipal engineering design of power supply and distribution system and automatic control design. Result The design ideas in load grade determination, energy saving optimization design, intelligent control, energy consumption management and other aspects are put forward, and some ideas and suggestions in energy saving, new energy are also put forward. Conclusion The main points of electrical design of underground municipal engineering are discussed and summarized, which can provide some reference for similar design.
2022, 9(S1): 99-104.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.015
Abstract:
Introduction A new construction scheme of 110 kV prefabricated cabin substation is proposed which can quickly respond to the needs of rapid station construction in industrial parks and promote the rapid development of urbanization in China. Method A complete set of electrical design method was proposed. Based on the general design experience of substation, the layout scheme of 110 kV substation construction and the selection of electrical equipment were determined according to the characteristics of load nature, load scale and land conditions of industrial park. Form the construction mode of 110 kV substation, including electrical wiring, size and splicing mode of electrical prefabricated cabin. Result According to the load size, grade and land conditions of the industrial park, three classical industrial park construction models are simulated which are mode A, mode B and mode C considering reliability and economy. Three corresponding construction schemes are designed, and technical and economic comparisons are analysed. Conclusion Three typical electrical construction schemes can guide the design of 110 kV substation in industrial park, and have certain popularization significance.
2022, 9(S1): 105-111.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.016
Abstract:
Introduction Massive usage of gas-insulated metal-enclosed switchgear (GIS) has caused serious electromagnetic interference, especially when the isolating switch in GIS is operated with small capacitive current, it does not have arc extinguishing ability, so it leads to multiple breakdowns of the dielectric between the contacts, and the voltage steep waves are rapidly refracted back and forth in the compact pipeline space to form a very fast transient overvoltage(VFTO). Method In this paper, a transmission line model suitable for solving transient ground potential rise was used, combined with ATP-EMTP software to analyze and calculate VFTO and transient ground potential rise(TGPR). Result The simulation is obtained and the TGPR at different measuring points in the model is 582~762 V. By comparing with the literature results, the error analysis shows that the maximum error is 3.77%. Conclusion The result verifies the correctness of the simulation calculation.
2022, 9(S1): 112-118.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.017
Abstract:
Introduction Exploring the difference of quantities between composite cross arm tower and conventional tower in different design schemes can quickly carry out scheme comparison and selection in the planning and design stage, and provide reference for the application of composite cross arm tower in different scenarios. Method Taking the 500 kV tower as an example, the tower was divided into several parts, and compared with the design scheme of the composite cross arm tower. At the same time, the tower weight, the amount of foundation concrete, the quantities of fittings and insulators were calculated, and the differences between the quantities of each composite cross arm tower and the conventional tower were studied. Result The calculation results show that compared with the conventional tower, the design scheme 1 of composite cross arm tower has better economy, better corridor compression performance and poor emergency repair performance; Design scheme 2 of composite cross arm tower has general economy, good corridor compression performance and general emergency repair performance; Design scheme 3 of composite cross arm tower has poor economy, good corridor compression performance and good emergency repair performance. Conclusion The research results of this paper can provide reference for the selection of composite cross arm scheme in the future.
2022, 9(S1): 119-124.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.018
Abstract:
Introduction With the increase of operation time of overhead transmission lines and the aggravation of aging and corrosion of equipment, the rusted ground wire replacement is significantly increased. Due to the large cross span of overhead transmission lines and the decrease of mechanical properties of corroded ground wires, there is a high risk in the replacement construction, especially when the same grade crosses multiple high-voltage power lines. Therefore, it is necessary to explore the methods, steps and safety precautions of replacement construction. Method Taking the replacement construction of corroded ground wire of a 500 kV transmission line spanning three 220 kV power lines in the same span from Pingguo to Laibin as an example, in order to reduce the risk in the replacement process, the measures were taken, such as wire sealing, two-way protection of steel wire rope installed on the ground wire support, reasonable setting of the traction field, reducing the traction speed of the ground wire and reclosure of the crossing line one by one. Result These measures are verified to be safe and effective on site, which can well protect the safety of the power lines across and reduce the risk of construction operations. Conclusion These key technologies in construction have important reference significance for future similar operations.
2022, 9(S1): 125-131.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.019
Abstract:
Introduction The result of tower foundation configuration directly affects the accuracy and rationality of the foundation scheme. The problem of slow manual configuration speed and low accuracy of tower height-low leg need to be solved. Method This paper analyzed the configuration process and configuration result,and then this paper put forward the problems in the manual configuration process. The accuracy of manual configuration was low, especially for towers with steep terrain or large slope ratio. The manual configuration results may affected the safety of foundation or caused the foundation design parmeters to be conservative. Through the problem analysis of the conventional configuration process, a reverse configuration method and a 3D configuration program were put forward in this paper. Result The reverse configuration method is used to configure the same tower, and the result of the reverse configuration method is accurate, which can quickly and accurately calculate the various parameters and accurately calculate the actual exposed height. Conclusion The accuracy and efficiency of reverse configuration method are better than that of manual configuration, and the configuration results are intuitive and accurate. It is recommended to use the method to configure the high-low leg in engineering.
2022, 9(S1): 132-138.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.020
Abstract:
Introduction In order to guide Guangdong power grid to carry out digital construction in an orderly manner during the 14th Five Year Plan period, realizing the digital sustainable development of Guangdong power grid, and effectively support the implementation of the development strategy of Guangdong Power Grid Corporation, this paper puts forward the methods of digital planning of power grid enterprises and suggestive digital development ideas. Method To ensure the planning methods and thought in compliance with the actual development of grid enterprises, the paper proposed persisting in the strategy-oriented planning thought, taking hold in actual conditions and innovation drive, and under the overall operation strategy of grid enterprises considering the business development needs as a whole to develop a general strategy of digitalization, which was planned exclusively and implemented step by step, i.e.to decide digital strategy planning by corporate development strategy, and decide digital technology structure by digital strategy planning. Result According to this method, the pain points of power grid business and the defects and deficiencies of digital construction of power grid enterprises are analyzed, the power and demand of digital development of power grid enterprises are analyzed, the digital development objectives and paths of power grid enterprises are put forward, the digital development blueprint of power grid enterprises is designed, and the application architecture and technical architecture are put forward. Conclusion The proposed digital development planning idea of power grid enterprises is scientific and feasible, and can provide guidance for the digital construction of Guangdong Power Grid Corporation in the 14th Five Year Plan.
2022, 9(S1): 139-146.
doi: 10.16516/j.gedi.issn2095-8676.2022.S1.021
Abstract:
Introduction The line loss of 10 kV distribution network is an important indicator to measure the economic benefits of power grid enterprises. At present, due to some areas, data collection cannot be synchronized, and the line topology relationship cannot be updated in real time. As a result, power grid companies have greater management line losses when calculating line losses. Using the distribution network synchronous phasor measurement terminal with the distribution network line loss real-time analysis platform for line loss management is an effective way to solve the problem of abnormal line loss. Method Firstly, it analyzed the abnormal main causes of the line loss of the medium voltage distribution network, and put forward the idea of improving the accuracy of the line loss. Then, the synchronous phasor measurement technology was introduced, and the synchronous phasor measurement architecture was proposed. Finally, the functional requirements of the line loss real-time synchronization analysis platform were proposed. Result Based on the power grid of a demonstration project in a certain area of Guangzhou as the research basis, according to the actual situation and needs of the power grid, the basis A design scheme for real-time synchronous analysis of line loss in 10 kV distribution network based on synchronous phasor measurement. Conclusion The solution in this paper provides effective direction and engineering experience for line loss management and governance of distribution network.
