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RSS2021 Vol. 8, No. 2
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2021, 8(2): 1-10.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.001
Abstract:
Introduction At present， investors in the power market have an increasing demand for digitization and intelligence of thermal power generation projects. Especially， overseas projects have put forward new requirements for the integrity and timeliness of digital design. Therefore， how to integrate the existing platform and data to form an effective implementation plan for digital collaborative design of thermal power plants has become an important issue faced by power design enterprises. Method This paper took Unique project in Bangladesh as the application object， and put forward a complete solution through case analysis， demand analysis， secondary development， standard digitization and other means. The scheme took the digital positive design as the overall requirement and constructed a set of basic database suitable for international engineering project. Through deep secondary development and integration， the whole process from system design， layout design to civil engineering design and drawing output was opened up. The basic platform such as the integrated design platform of process and civil engineering had been improved. The digital positive design of the project was realized. Result Through the in-depth application， the barrier of digital design information isolated island is broken by technical means， and the positive and full connection of data is realized， which improves the cooperation and drawing output efficiency of the upstream and downstream. Conclusion The practical results of the project prove that the scheme is scientific and efficient， which provides a reference solution for the digital positive design of thermal power plants.
2021, 8(2): 31-36.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.005
Abstract:
Introduction In order to fully implement the national policies on water resource development and utilization， embody the water-saving policies on water resource reuse， more and more industrial water source supplied to power plants in south China is reclaimed water， so it is necessary to discuss the schematic design of advanced treatment for reclaimed water. Method Taking a power plant in Guangdong province as an example， this paper designed the most suitable advanced treatment for reclaimed water by analyzing the treatment process of wastewater treatment plant， water quality indicators of reclaimed water and industrial water quality requirements of power plant. Result Adopting the scheme of "contact flocculation inclined plate sedimentation tank + filter tank"， the system process was simple， the investment and operation cost were low， and the system can guarantee the safe and reliable operation. Conclusion This paper aimed to provide a reference scheme for the advanced treatment system design of reclaimed water in similar water source power plants in the future.
2021, 8(2): 11-16.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.002
Abstract:
Introduction To find out the best extraction heating scheme according to the medium pressure heating steam parameters of large capacity combined cycle unit. Method Combined with the heat load characteristics of Zengcheng project， this paper discussed and analyzed in detail the system configuration， initial investment， load adaptability， unit efficiency and power output of various extraction heating schemes applied to gas steam combined cycle units. Result The analysis results showed that， compared with hot section extraction and IP cylinder extraction， cold section extraction has higher unit power generation output， power generation efficiency and comprehensive energy utilization， and the initial investment was the lowest. Conclusion Cold section steam extraction is a kind of medium pressure steam extraction heating scheme with better parameter matching adaptability， stronger ability to adapt to variable operating conditions of units， better thermal economy and initial investment， and more suitable for large capacity combined cycle units. This scheme can be used for reference for similar engineering designs.
2021, 8(2): 17-24.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.003
Abstract:
Introduction The paper aims to study the dynamic performance of the H-class gas turbine foundation， obtain the relationship between the key influencing parameters and the basic performance of the gas turbine， and guiding the parameters selection and engineering design. Method The foundation thickness of H-class gas turbine， concrete elastic modulus， unbanlance force and damping ratio were selected as the key influencing parameters， and the three-dimensional finite element model of H-class gas turbine foundation was established through ANSYS， and the harmonic response analysis method was used to obtain the dynamic amplitude of the foundation under the unbanlance force. Result Through a large number of finite element calculation and analysis， the response surface about the maximum control amplitude of the H-class gas turbine foundation，the thickness of the foundation and the elastic modulus of concrete presents an S-shaped curved surface， which has relatively flat ends and rapid growth in the middle； The amplitude of the basic control point of the gas turbine increases proportionally with the increase of the unbanlance force. While the amplitude change caused by the damping change is not monotonous， and the increase of the damping may increase or decrease its amplitude. Conclusion In engineering design analysis， the parameters of appropriate foundation thickness， concrete elastic modulus， unbanlance force and damping ratio should be selected based on specific engineering data and design conditions， which is the prerequisites to obtain correct and reliable dynamic performance analysis and gas turbine foundation design.
2021, 8(2): 25-30.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.004
Abstract:
Introduction In order to complete the compilation of energy saving report with high quality， taking the gas cogeneration project as an example， the key points and suggestions in the compilation were put forward. Method Based on the case of energy saving report compilation of new H-class Gas Turbine projects， this paper analyzed the common mistakes in the chapters of the report compilation by citing policy documents， standards and specifications， compilation guidelines， etc. Result The main points of energy saving report are project summary， energy consumption accounting， energy efficiency evaluation， and impact analysis of energy consumption double control target. Conclusion The research results provide reference and guidance for energy saving report compilation and review units.
2021, 8(2): 37-45.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.006
Abstract:
Introduction The suction bucket jacket is a new type of offshore wind turbine foundation with many advantages， and its vibration characteristics are obviously different from those of traditional foundations. Correctly handling the boundary conditions of the infinite foundation is very important to accurately analyze the vibration problem， so this paper analyzes the vibration characteristics of the suction bucket jacket offshore wind turbine under different boundary conditions. Method Taking a suction bucket jacket offshore wind turbine as the analysis object， a full three-dimensional finite element model of structure and soil coupling was established in ANSYS APDL， the influence of boundary conditions on the natural frequency was studied， and the sensitivity analysis of related parameters was carried out. Result Different boundary conditions have a great influence on the natural frequency of the whole structure. Changing the boundary conditions has a greater influence on the axial stiffness and torsional stiffness than the bending stiffness of the structure. The natural frequency of the whole structure increases with the spring stiffness of the viscoelastic boundary， the elastic modulus of the soil， and the coefficients of friction between the bucket and soil. Conclusion The related factors that affect the calculation accuracy of the natural frequency of the whole structure are analyzed， which can provide references for engineering calculations.
2021, 8(2): 46-51.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.007
Abstract:
Introduction Basically， the centralized wind power projects in South China or on land have been developed， and the distributed wind power projects based on making full use of the idle land around villages and towns or factory areas have sprung up. It is expected that the distributed wind power generation which utilizes low-speed wind will bring new incremental space for the domestic wind power market. Whether the location of distributed wind turbine is right or not will directly affect the economic benefit of the power station. Due to the fact that there is no support of wind resource data actually measured on the idle land around villages and towns or factory areas， it is facing a great challenge to develop distributed wind farms or select the site and type of the wind turbine. Method This paper put forward the idea of finding the load first， then selecting the site of wind power plant， and to analyze and select the best wind turbine location depending on the meteorological data of wind resources. Result The research shows that： taking the design of a distributed wind farm in South China as an example， by adopting the idea of distributed-wind-power plant site selection and wind turbine type selection proposed in this paper， making full use of the idle land around the factory and mine， the optimal design suggestion of selecting to use three sets of 3X anti typhoon type wind turbines with 100-meter-high hub is reached. Conclusion The proposed idea of distributed wind power plant location and wind turbine type selection is correct and effective， which can provide guidance for practical operation.
2021, 8(2): 52-55.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.008
Abstract:
Introduction The pressurizer proportional spray control valve is one of the key valves for PWR nuclear power plant and it is the only level 1 nuclear safety control valve in power station system. Mastering the technical characteristics of the valve has very important guiding significance for engineering and domestic research for the valve. Method Based on two typical structures used in domestic PWR nuclear power units - pneumatic V-ball proportional spray valve and solenoid angular proportional spray valve， this paper compared and analyzed them from structural design， working principle， operation and maintenance. Result Through analysis， it was concluded that the two types of proportional spray valves have different technical routes， but both can realize the spray control function required by the pressurizer system of nuclear power plant. Users can choose relatively suitable products according to the technical route and specific needs of nuclear power plant. Conclusion However， in the new nuclear power market in the future， the solenoid angle proportional spray valve was expected to have a broad application prospect.
2021, 8(2): 56-62.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.009
Abstract:
Introduction In domestic thermal power plants， traditional line transmission technology is still used in the fuel management system， which lacks flexibility， reliability and mobility in terms of data integration processing or interconnection with the cloud platform. Data communication is an important development trend of intelligent power plant management， and the higher transmission rate is the goal of building a big data cloud computing platform for smart power plants in the future. This paper provides a reference for studying the application of higher-speed wireless data transmission in power industry， building and applying the latest wireless transmission technology in power plant data transmission network and integrating it with smart power plant big data platform. Method Firstly， this paper introduced the current status and composition of fuel management platform in power plant， and described the 5G and WiFi6 technology， which was integrated into the existing network architecture of power plant management platform， so as to realize efficient application and optimization research. Result By analyzing the problems existing in most of the fuel management platforms in power plants， the high-speed network can effectively improve the operation safety and stability of power plants and bring greater economic benefits. Conclusion The construction of a wireless high-speed and complete data transmission system is more conducive to the effective and safe construction of intelligent fuel management platform， which should be designed and planned in the early stage of the project and applied to thermal power generation industries.
2021, 8(2): 63-70.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.010
Abstract:
Introduction In order to solve the problem of changing the external steam supply of the unit from industrial steam to heating steam ， a thermal power plant is taken as an object to carry out technical feasibility study. Method Four kinds of schemes including the control valve group， the two-cylinder steam turbine， the post-unit back pressure steam turbine shared by the whole plant， and the steam-driven feed water pump unit with generator were compared and analyzed. Result Considering the characteristics of the schemes and project practice， the scheme of post-unit back pressure steam turbine shared by the whole plant is selected. Conclusion The scheme is based on the principle of energy level cascade utilization， which is reliable in operation and economical. It also provides a useful reference for the comprehensive steam supply transformation of subsequent units.
2021, 8(2): 71-77.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.011
Abstract:
Introduction With incessant grid-connection of wind farms and photovoltaic power stations， the development of regional power grid structure cannot keep pace with the growth rate of new energy unit capacity， characteristics of multi-energy mix and hierarchical features of section bring difficulties to the formulation of day-ahead generation scheduling， for this reason， a method for multi-level and multi-energy day-ahead generation scheduling considering the safety constraint of the section and the fairness of dispatch was proposed. Method This paper presented a depth-first search for the restricted section， and proposed an output limitation allocation strategy based on information entropy. A fairness calculation method was constructed by using the concept of information entropy in economics to guide the quantitative indicators for evaluating scheduling fairness. Result Under the circumstances of ensuring that the cross-sectional current is close to the stability limit， the active power of each power plant is distributed reasonably and equitably， thereby realizes the full utilization of wind and solar resources. Conclusion Through a practical example of a regional power grid， it is proved that this method can solve the existing problems in new energy day-ahead generation scheduling and has good practical application value.
2021, 8(2): 78-84.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.012
Abstract:
Introduction The safe and stable operation of UHV transmission lines is essential to the safety of power grids. When the new substation deconstructs the original long line in the power grid planning and construction， the following problems， such as the three-phase unbalanced current line does not meet the setting requirements， line high impedance over-compensation generates overvoltage， may occur. These problems may seriously threaten the safe and stable operation of the power grid and should be solved. Method In order to solve the above problems， the electromagnetic transient software ATP-EMTP was used to simulate the unbalanced current and overvoltage in 500 kV transmission lines on the same tower， so as to explore the influencing factors and change mechanism of these parameters， and then put forward countermeasures. Results The simulation results show that the main factors affecting the double circuit line's unbalanced current on the same tower include transposition and phase sequence arrangement. Increasing the number of transpositions can effectively reduce the unbalanced current level. By adopting a reverse phase sequence arrangement is also efficient. The main reason that affects the power frequency resonance over-voltage is whether the compensation degree is close to full compensation. During over-compensation， increasing the compensation degree can reduce the recovery voltage， but the potential supply current will increase relatively. Conclusion The above conclusions have guiding and reference significance for power grid planning， construction， and safe operation. Furthermore， it can effectively solve related problems in actual projects.
2021, 8(2): 85-90.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.013
Abstract:
Introduction With the access of large-scale distributed generation and flexible load in distribution network， the accuracy and speed of traditional terminal measurement are difficult to meet the actual needs， while the new generation of distribution micro synchronous phasor measurement unit （D-PMU） is an important way to solve the above problems. Method Firstly， the working principle and application of D-PMU were analyzed； secondly， the synchronized phasor measurement system of distribution network and its installation and deployment scheme were proposed； then， according to the requirements of the demonstration area， the architecture and deployment scheme of wide area measurement and control system of distribution network were proposed； finally， the application of D-PMU in intelligent distribution network was summarized. Results The effectiveness of the demonstration construction verifies the feasibility and economy of the key technology and design scheme developed by the project. Conclusion It provides rich engineering experience for the further integration and promotion of D-PMU with other traditional fields of distribution network.
2021, 8(2): 91-98.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.014
Abstract:
Introduction Aiming at the problems of business concentration， fault decision delay and high data transmission overhead for power grid dispatching control center， a fast and intelligent information processing method for fault recorder master station based on edge computing was proposed. Method Based on the edge computing design principle and overall framework of fault recording information processing， we used DataSocket asynchronous parallel real-time communication and Hadoop distributed storage scheme to ensure stable transmission， fast storage and retrieval for data， adopted improved SSDA algorithm to sift out the fault information to analysis quickly， and submitted the fault analysis results electronically. Result The experimental results show that this method has good application effects in mass data processing， rapid fault diagnosis， auxiliary decision support， etc. It can alleviate the pressure of information processing of dispatching control center and shorten the time delay of fault decision-making. Conclusion The proposed method is effective and feasible to handle massive fault recording information reliably combined with the Guangxi power grid operation case.
2021, 8(2): 99-104.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.015
Abstract:
Introduction The power of offshore oilfield group mainly comes from generating units， which has problems of poor power supply reliability， low power generation efficiency， high pressure of energy saving and emission reduction， etc. Method According to the function orientation and working principle， the offshore step-down substation could be divided into six areas： 220 kV switchgear area， transformer area， 35 kV switchgear area， 10 kV switchgear area， reactive power compensation area and auxiliary room. The recommended layout plan was given through the study of each area. Result The layout plan proposed in this paper plays an important role in improving the reliability of offshore step-down substation， ensuring the convenience of equipment maintenance and service， and minimizing the platform size. Conclusion The layout plan proposed in this paper can play a good role in guiding offshore step-down substations in oilfield group project and has high reference value.
2021, 8(2): 105-110.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.016
Abstract:
Introduction Reasonable selection of key equipments of flexible DC distribution network will help to optimize the layout of the converter station， and it also plays an important role on improving the reliability of the converter station and reducing the investment cost of the project. Method By i ntroducing the key equipments of flexible DC distribution network of Tangjiawang typical project in Zhuhai， the advantages and disadvantages of different types of key equipments were analysed and compared， and the the selection suggestions of key electrical equipment were given. Result By focusing on the analysis of the type selection scheme， this paper expound the principle of equipment selection for flexible DC converter station and provides the research basis for the future project of flexible DC distribution network. Conclusion The relevant research results of this paper can provide important reference for the simulation modeling and the engineering design of flexible DC distribution Network projects in the future.
2021, 8(2): 111-118.
doi: 10.16516/j.gedi.issn2095-8676.2021.02.017
Abstract:
Introduction Under the new environment of power market， the power system planning contains more variables， constraints， planning objectives and complexity. The uncertainty variables include load， power supply， power flow， equipment retirement， policy， social economy， bussiness mode， investment profit， etc. It is necessary to establish appropriate plannnig model based on the complexity mentioned above. The research methods of the whole power planning and means need to be further optimized. Method Firstly， this paper reviewed the status quo of the more mature power markets in Australia， PJM in the United States， Europe and other foreign countries， and analysed their power system planning models and methods. Result Combined with the current situation of Guangdong power market development， this paper optimized the planning method of Guangdong power system under the power market environment. Not only did it give suggestions for optimizing and adjusting the institutional mechanism of power planning work， but also complemented and improved the five aspects of planning input， project classification， scenario study， grid economic efficiency assessment and uncertainty analysis according to the traditional Guangdong power system planning method. Conclusion Under the new environment of Guangdong spot market of energy， by establishing a reasonable power system planning and evaluation system， it can be beneficial to rationalize allocation of power sources， achieve coordinated planning between network sources， and better adapt to the future development of the power market.
