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RSS2024 Vol. 11, No. 6
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2024, 11(6)
Abstract:
2024, 11(6): 1-17.
doi: 10.16516/j.ceec.2024.6.01
Abstract:
Introduction With the increasing demand for flexible peak shaving of thermal power units and the rapid development of information technology, thermal power enterprises are shifting from the traditional operation and management mode toward a cleaner, more efficient, reliable digital and intelligent mode. How to improve the intelligence, precision and reliability of coal-fired units in the flexible peak-shaving process has become a key issue of concern to those in the industry. Method Aiming at the deep peak shaving demand of the power system, this paper summarized the typical problems in the process of flexible peak shaving and analyzed the overall development of control theory applied to boilers in coal-fired units. Based on this, this paper conducted a comprehensive analysis of coal-fired boiler flexible peak shaving algorithm models and their applications based on intelligent control from four aspects: optimization control of boiler combustion performance, precise control of wide-load denitration, boiler operational energy efficiency control, and monitoring and diagnosis of main and auxiliary machinery equipment. Result On this basis, the research progress and application effects of intelligent control theory and models in the flexible peak shaving of coal-fired boilers are discussed in detail. Conclusion At present, based on the common problems in the flexible peak-shaving process of coal-fired boilers, it is necessary to improve the accuracy of basic data acquisition, promote the complementary integration of data and knowledge, and strengthen multi-objective optimization control and DCS control system optimization on the basis of the stable combustion ability improvement of the combustion organization method. At the same time, it is important to consider the dialectical optimization relationship between peak shaving economy and unit life, thereby providing intelligent and precise solutions to improve the flexible peak shaving capabilities of coal-fired boilers.
2024, 11(6): 18-32.
doi: 10.16516/j.ceec.2024.6.02
Abstract:
Introduction Accurate calculation of the hydrodynamic coefficients for floating structures and the investigation of the flow field distribution around floating bodies on the marine free surface are essential for improving the engineering design and application of marine structures. Method This study utilized the computational fluid dynamics (CFD) approach and the Reynolds Averaged Navier-Stokes (RANS) method and considered the effects of viscosity and free surface interactions on the hydrodynamic behavior of floating structures. By employing the dynamic mesh technique, this study simulated the periodic movements of simplified three-dimensional (3D) shapes: spheres, cylinders, and cubes, which were representative of complex marine structures. The volume of fluid (VOF) method was leveraged to accurately track the nonlinear behavior of the free surface. In this analysis, the added mass and damping coefficients for the fundamental modes of motion (surge, heave, and roll) were calculated across a spectrum of frequencies, facilitating the fast determination of hydrodynamic forces and moments exerted on floating structures. Result The results of this study are not only consistent with the results of the 3D potential flow theory but also further reflect the role of viscosity. This method can be used for precise calculation of the hydrodynamic coefficients of floating structures and for describing the flow field of such structures in motion on a free surface. Conclusion The methodology presented goes beyond the traditional potential flow approach.
2024, 11(6): 33-40.
doi: 10.16516/j.ceec.2024.6.03
Abstract:
Introduction The realization of "dual carbon" goals in the construction of a new power system necessitates the transformation of existing thermal power plants to accommodate peak load operations. The safety of thermal power units during flexible operation is a critical element for enhancing the overall stability of the power system. Air preheater is the key auxiliary equipment that affects the wide-load operation capacity of thermal power units. This paper addresses the challenges associated with flue gas temperature fluctuations and blockage and corrosion induced by excessive ammonia injection. It is very important to develop a real-time assessment and safety status monitoring model for dust and blockage of rotary air preheaters. Method Based on the big data of wide-load operation monitoring of 600 MW and 350 MW units in central China, the paper developed a model for air preheater blockage assessment based on approximation of the resistance coefficients in the case of various time scales. Furthermore, the flue gas temperature at the outlet of the air preheater and the cold end working temperature were used as monitoring indicators to count the proportion of parameters exceeding the limit in multiple load sections of the unit. Result The results show that, at a peak regulation load of 39%, there is approximately a 20% probability of temperature exceedance. In addition, the independent calculation of the blockage risk based on the two indicators may result in a certain degree of underestimation of its degradation rate compared to the calculation based on a joint distribution. Besides, with the verification of data from the two units, the method can quantify the short-term (within the soot-blowing cycle) and mid-and-long term evolution of the air preheater blockage. Conclusion This assessment strategy applies to other equipment and systems in thermal power plants, such as SCR denitrification systems and coal mills, providing a quantitative assessment of safety risks during peak load operation. It guides thermal power units to efficiently and stably cooperate with the new power system in dispatching.
2024, 11(6): 41-51.
doi: 10.16516/j.ceec.2024.6.04
Abstract:
Introduction Natural gas hydrate is a clean energy source with great exploitation value, but the insufficient heat supply in the late stage of hydrate extraction leads to a low gas production rate. Reservoir modification can significantly increase hydrate reservoir permeability and improve heat transfer efficiency. Based on this, the effect mechanism of the gas production rate of fractured hydrate reservoirs under heat injection extraction mode after fracturing is analyzed. Method Hydrate reservoir after fracturing modification was taken as the research object in this paper, and a numerical model of thermo-hydro-chemical was established to simulate and analyze the effects of heat injection temperature, fracture aperture, and heat injection velocity on the gas production rate of hydrate reservoir, and then the orthogonal design of heat injection parameters was carried out. Result The results show that the effect of heat injection temperature, heat injection velocity, and fracture aperture on gas production rate can be divided into three stages in the process of fractured hydrate heat injection extraction, and the higher the heat injection temperature, heat injection velocity, and fracture aperture, the higher the gas production rate of hydrate reservoir. The orthogonal analysis of heat injection parameters shows that the heat injection temperature has a significant effect on the peak gas production rate, followed by heat injection velocity, and the fracture aperture has the least effect. Conclusion In this paper, the effect mechanism of gas production rate in heat injection extraction of a hydrate reservoir with a single fracture is clarified, and the efficiency of hydrate extraction is qualitatively evaluated, which provides some ideas for hydrate extraction in situ.
2024, 11(6): 52-58.
doi: 10.16516/j.ceec.2024.6.05
Abstract:
Introduction In the current context of increasing energy demand and environmental conservation advocacy, it is necessary to seek alternative energy sources for traditional fuel generators, and better fuels can be identify by studying the evaporation characteristics of fuels. Method The droplet suspension experiments were conducted to investigate the evaporation characteristics of droplets of methyl oleate fuel with ethanol contents of 0%, 20%, 30%, and 50% at the ambient temperature of 673 K and 773 K. Results The results indicate that as the ambient temperature increases from 673 K to 773 K, the evaporation rate of the blended droplets rises. Furthermore, with the continuous increase in ethanol contents, the difference in droplet evaporation rates between the two ambient temperatures becomes more pronounced. At lower ambient temperatures, the evaporation process of the droplets is relatively stable, with the droplet evaporation rate showing a gradual decrease trend. The addition of ethanol leads to an extension of the droplet's equilibrium evaporation stage, increasing the evaporation time and inhibiting the evaporation process. Conversely, at higher ambient temperatures, the evaporation process exhibits greater fluctuations, with the droplet evaporation rate showing a gradual increase trend and reaching its maximum at the ethanol content of 50%. The addition of ethanol induces micro-explosion events, reducing the evaporation time and enhancing the evaporation process. Moreover, increasing the ambient temperature and ethanol content promotes the occurrence, intensity, and frequency of micro-explosion events in droplets. Conclusions Based on the experimental results of droplet suspension experiments on the evaporation characteristics of methyl oleate and ethanol blended droplets, this study provides important data support and references for related fuel research and applications.
2024, 11(6): 59-68.
doi: 10.16516/j.ceec.2024.6.06
Abstract:
Introduction Transmission towers are crucial infrastructure in power systems, and their wind-induced collapse can cause significant losses to power systems. To find solutions to prevent wind-induced collapse of transmission towers, it is necessary to investigate the causes, contributing factors, and processes of wind-induced collapse. Method Research results on wind-induced collapse of transmission towers were reviewed from the perspectives of accident analysis, full-scale tests, wind tunnel tests, and numerical simulations. The relevant research results were analyzed and summarized, and recommendations for subsequent research were provided. Result The investigation revealed that the factors contributing to the wind-induced collapse of transmission towers include the presence of weak members in the tower body, defects in the calculation of wind loads on transmission lines in the code, and extreme wind loads not considered in the code. Conclusion It is recommended to research extreme wind load models, the impact of crosswind and torsional wind loads, accurate models of single tower and tower line systems, and improvement of relevant regulations in the code.
2024, 11(6): 69-78.
doi: 10.16516/j.ceec.2024.6.07
Abstract:
Introduction By analyzing the history of human utilization of energy and the current situation of China's rural energy, this paper summarizes the main energy structure characteristics of rural areas in China. Method Through literature method, comparative analysis and other research methods, this paper explored the current situation of rural energy development and identified the existing problems and future development trends of rural energy development. Result From the perspective of the diversification of rural energy use, the usage of firewood is gradually decreasing, the development of rural biogas tends to be stable, the rural electricity consumption is becoming saturated after the completion of rural power grid transformation, the proportion of gas is increasing year by year with the implementation of the "West-to-East Gas Transmission" policy, the solar thermal utilization is steadily declining after the large-scale popularization, and the solar power generation is rapidly increasing with the breakthrough of photovoltaic power generation technology. Conclusion According to the current situation of rural energy in China, the traditional way of using rural energy has been gradually changed, and the development of new energy has been paid attention to. In combination with national policies, the corresponding energy characteristics of rural energy have been found, and the development trend of rural energy under the "dual carbon" goal in the new era of "energy saving and emission reduction" has been explored.
2024, 11(6): 79-87.
doi: 10.16516/j.ceec.2024.6.08
Abstract:
Introduction The concurrent stress of pollution emissions and energy consumption resulting from high-intensity human activities directly affect the high-quality development of cities. However, assessing the pressure and status of urban development comprehensively proves challenging through traditional single environment carrying capacity or energy carrying capacity. With a case study of the city of Dongguan, a new industrialized city in Guangdong province, as an example, the paper evaluated the environment and energy compound carrying capacity, and put forward targeted suggestions for the development of Dongguan by exploring the influencing factors. Method Based on the idea of pressure-state-response analysis, the paper constructed an evaluation index system of environment and energy compound carrying capacity by selecting 19 evaluation indicators from two systems of social economy and environment and energy. The weights of the evaluation indicators were determined by the hierarchical analysis method and standardized to achieve a high degree of comparability. The relative affiliation of samples was calculated using the variable fuzzy evaluation method to reflect the dynamic changes of the indicators. Result The results of this study show that the environment and energy compound carrying capacity of Dongguan increased from 0.10 to 0.77 from 2005 to 2021, indicating an improving trend driven by the strengthening of environmental governance and the improvement of energy efficiency. To improve the environment and energy compound carrying capacity in Dongguan, attention should be paid to the shortage of water resources, the reduction of forest land coverage, and the strengthening of municipal construction and operation. Conclusion The environment and energy compound carrying capacity evaluation system constructed in the paper effectively reflects the synergistic changes of water environmental carrying capacity and energy carrying capacity, providing a reference for the study of sustainable urban development and the evolution of urban environment and energy.
2024, 11(6): 88-93.
doi: 10.16516/j.ceec.2024.6.09
Abstract:
Introduction The floating nuclear power plants have the advantages of mobility, flexible layout, less impact from earthquakes and tsunamis, no occupation of land area, and less impact from site conditions. It can effectively support offshore resource development and island energy supply, and is one of the hot topics in nuclear energy utilization today. As the most important equipment in conventional islands, the structural type and parameters of steam turbine generator sets directly affect the operation safety and stability of power plants. Method Based on the ACP100S reactor, this paper discussed the technical scheme of offshore floating nuclear energy platform turbine generator unit from the aspects of turbine exhaust direction, number of shaft systems, back pressure, final stage blades, reheat parameters, reheat stages, and generator cooling method. Result It is recommended to choose a steam turbine consisting of a single shaft, downward exhaust, throttling steam distribution, one single flow high-pressure cylinder module, and one single flow low-pressure cylinder module, with 1200 mm long low-pressure cylinder blades, thermal scheme of 1-stage reheating and 4-stage backheating, single-process condenser, and air-cooled generator. Conclusion The results can provide reference for the subsequent design of floating nuclear power plant systems and related design parameters of steam turbine generator.
2024, 11(6): 94-101.
doi: 10.16516/j.ceec.2024.6.10
Abstract:
Introduction Under the scouring impact of secondary side fluid, the steam generator tube is prone to flow-induced vibration. One of the main mechanisms leading to tube vibration is the random turbulent force. When the fluctuating pressure frequency of the fluid is close to the natural frequency of the tube, structural resonance will be caused and long-term vibration will lead to the failure of the tube. Therefore, it is necessary to study the dynamic response characteristics of steam generator tubes under fluid excitation. Method In this paper, a flow-induced vibration test device for the bend zone of tube bundle with a pitch-diameter ratio of 1.47 was designed. The secondary side fluid condition was simulated by air-water two-phase flow. The fluid fluctuating pressure and the vibration acceleration of tube bundle with a void fraction of 0.7～0.98 and a flow velocity between tubes of 5～13 m/s was measured. Result The results show that: the main frequency of fluctuating pressure is close to the natural frequency of tube at low flow velocity, which is easy to causes resonance; when resonance occurs, the amplitude of the tube bundle increases; with the increase of velocity between tubes, the fluctuating pressure on tube bundle increases correspondingly. With the increase of the void fraction, the fluctuation pressure first increases and then decreases. When calculating the main frequency of fluctuating pressure under the condition of air-water two-phase flow, the coefficient in the empirical formula can be adjusted appropriately. Conclusion This test simulated the working conditions of the secondary side fluid operation in the bend zone of steam generator tube bundle and considered the geometric similarity with the prototype and the similarity of support and constraint in the design of the model. This test was closer to the actual situation than the previous experimental research and can provide design references for engineering applications.
2024, 11(6): 102-110.
doi: 10.16516/j.ceec.2024.6.11
Abstract:
Introduction This paper mainly discusses the principles, methods and measures of lightning protection design of offshore floating photovoltaic power station to meet the safe operation of offshore floating photovoltaic power station in harsh climate conditions. Method Through the in-depth analysis of the marine environment, offshore floating photovoltaic power station structure and lightning characteristics, this study proposed a series of effective lightning protection measures. First, the use of metal structure could improve the lightning resistance capacity of the floating photovoltaic power station. Secondly, the installation of lightning rods could absorb and release lightning energy, reduce the impact of lightning on the power station. In addition, the establishment of the ground grid could effectively disperse the ground potential and reduce the risk of lightning strike. The use of insulating materials helped to reduce the direct invasion of lightning on the power station equipment. At the same time, the installation of monitoring equipment could be real-time monitoring of lightning activities, timely response measures. Regular inspection and maintenance was an important part to ensure the stable operation of the lightning protection system. Result The principle and implementation method of each lightning protection measure are elaborated, and some technical problems in lightning protection design are proposed. For example, how to ensure the good grounding of the lightning rod, how to choose the appropriate insulation material, etc. These achievements provide an effective reference for the improvement of the lightning protection capacity of the offshore floating photovoltaic power stations. Conclusion The results of this study will help to improve the lightning protection capacity of the offshore floating photovoltaic power stations and ensure the safe operation of the power stations. Based on full consideration of the marine environment, the structure of the offshore floating photovoltaic power station and the lightning characteristics, the appropriate lightning protection measures can effectively reduce the risk of lightning strike and ensure the stable operation of the power station. This is of great significance for promoting the development of renewable energy and protecting the environment. Further study can provide more reference and guidance for lightning protection design to cope with the more complex and harsh climate conditions in the future.
2024, 11(6): 111-123.
doi: 10.16516/j.ceec.2024.6.12
Abstract:
Introduction In order to test the applicability of sea surface wind field data set in Yangjiang offshore wind farm area, this paper tests and evaluates the 10 m wind field of daily gridded advanced scatterometer (DASCAT), European centre for medium-range weather forecasts reanalysis v5 (ERA5) and final reanalysis data (FNL). Method The research was based on the 10 m wind fields at four sites in the Yangjiang offshore wind farm area in Guangdong province. Result The results demonstrate five pionts: (1) The wind speed correlations are above 0.8, with ERA5 the highest. The RMSE of wind speed are within 2.6 m/s, with DASCAT being the best in SWZ and ERA5 being the best in DWZ. Both FNL and ERA5 show significant underestimation of wind speed in SWZ, while DASCAT has smaller mean wind speed deviation than those of FNL and ERA5, and ERA5 mean wind speed is closer to those of observation. (2) The wind direction correlation reaches more than 0.75, with ERA5 being the highest in SWZ and FNL being the highest in DWZ. The RMSE of wind direction are within 35°, and ERA5 errors are the minimum. However, DASCAT and FNL are both closer to the observed predominant wind direction. (3) The statistics of the RMSE of wind speed in each wind speed period show that FNL is the minimum in the low wind speed period while DASCAT is the minimum in the medium and high wind speed periods in SWZ. ERA5 is the minimum in all wind speed period in DWZ. In both SWZ and DWZ, ERA5 has the highest wind speed correlation in both the low and medium wind speed periods, and FNL has the highest wind speed correlation in the high wind speed period. (4) The monthly wind speed errors of DASCAT and ERA5 are small and distributed relatively close to each other in SWZ, with peaks in April-May and October; ERA5 errors are smallest in DWZ, with a peak in July and a trough in December-January of the following year. (5) The distribution characteristics of the multi-year average wind speed for 10 m show that the wind speed increases from north to south and from west to east, and the wind speed gradient is large in SWZ. Conclusion Overall, the 10 m sea surface wind field data set of ERA5 performs better in the study area, and the deficiency of its systematic low mean wind speed can be corrected by DASCAT.
2024, 11(6): 124-134.
doi: 10.16516/j.ceec.2024.6.13
Abstract:
Introduction This paper conducts study based on the design of monopile foundations for offshore wind turbines in sandy seabed, to analyze the influence of drainage conditions on soil-foundation interaction, and compare the initial stiffness of soil-foundation interaction obtained by prevailing design methods. Method The finite element method was adopted to analyze the soil-foundation interaction of laterally loaded large diameter monopile foundations. An simple anisotropic sand constitutive model, i.e. SANISAND constitutive model based on the bounding surface theory was used for numerical simulations. Analysis of laterally loaded large diameter monopile foundations under different drainage conditions was performed to study the influence of drainage conditions on soil-foundation interaction. And the numerically derived p-y curves were compared with those predicted by the API method for comparison of the initial stiffness of soil-foundation interaction. Result It is found that the influence of drainage conditions on the soil-foundation interaction of laterally loaded large diameter monopile foundations is dependent on the load level. At a relatively low load level, the difference in drainage conditions has negligible influence on soil-foundation interaction stiffness. However, as the load level increases, such influence becomes significant. It is also found that the API p-y curves overestimate the soil-foundation interaction stiffness of laterally loaded large diameter monopile foundations in sandy seabed. Conclusion The influence of drainage condition on the soil-foundation interaction of laterally loaded large diameter monopile foundations is dependent on the load level, under the load level concerned in engineering design, the influence of drainage conditions on the stiffness of soil-foundation interaction of large-diameter monopile foundations is negligible, and it is viable to design monopile foundations based on fully drained conditions. The API p-y curves over-predict the stiffness of soil-foundation interaction.
2024, 11(6): 135-141.
doi: 10.16516/j.ceec.2024.6.14
Abstract:
Introduction In order to address the issues of high costs and occupation of limited road space in urban ground distribution, we build an underground logistics delivery networks, enabling efficient, automated, and intelligent logistics transportation. Method We aimed to achieve efficient and economical logistics distribution while keeping costs under control by using advanced information technology. Result This paper envisages an underground smart logistic system—"Way+". This system, based on underground municipal infrastructure, introduces information technology, breakthrough planning architecture theory and intelligent manufacturing technology, by building an underground high-speed intelligent channel network specialized for freight, so as to realize automatic and intelligent delivery of goods Conclusion This paper provides innovative route for new retail and construction of future green smart cities.
2024, 11(6): 142-152.
doi: 10.16516/j.ceec.2024.6.15
Abstract:
Introduction Under the "dual carbon" goal, energy storage has become an important participant in regulating the electricity market and a key link in building a new type of power system. Under the current energy storage market conditions in China, analyzing the application scenarios, business models, and economic benefits of energy storage is conductive to provide a fundamental basis for the future large-scale development and commercial operation of new energy storage. Method The paper studied the application scenarios of energy storage on the power generation side, grid side, and user side, analyzed the economic benefits and income sources of various types including power generation side, independent shared energy storage, etc., summarized the problems in the initial development of energy storage, and proposed relevant suggestions. Result Currently, the cost per kilowatt-hour for novel electrochemical energy storage in China is relatively high, leading to low overall economic benefits. Investment entities find it difficult to achieve profitability, and there are limited business models available. Conclusion In the future, China should establish diverse revenue sources for new energy storage, support various market entities in investing in, constructing, and operating shared energy storage facilities, and innovate market profit models for the development of new energy storage.
2024, 11(6): 153-163.
doi: 10.16516/j.ceec.2024.6.16
Abstract:
Introduction As the reform in the energy sector continues to deepen, the introduction of a demand response mechanisms guided by market factors have become an inevitable trend in the development of regional integrated energy system (RIES). Method Based on the coupling characteristics of multiple energy flows in RIES, three different flexible loads were divided according to the demand response potential and user energy consumption characteristics, which were shiftable load, dispatchable load and reducible load. Finally, a RIES operation optimization model was established considering the flexible load demand response for cooling, heating and power. The load demand response plan and the optimization results of each energy network are obtained by using the economic benefits of both supply and demand sides, the peak and valley values of electricity load, and the values of carbon emissions as the optimization objective of the model. Result The results indicate that demand response reduces the total cost of RIES by 3.70% and the peak to valley ratio of electricity load by 29.7%. Conclusion The feasibility and practicality of the proposed model are verified in this paper.
2024, 11(6): 164-173.
doi: 10.16516/j.ceec.2024.6.17
Abstract:
Introduction Distributed generation (DG) has a significant impact on the operational characteristics of the load side of the power grid. However, current research focuses mainly on analyzing and modeling the characteristics of a single type of distributed generation, and there is limited research on general models that can uniformly describe DGs with certain similarities. Method This article constructed an inverter-interfaced distributed generator (IIDG) model and employed a novel optimization algorithm. Firstly, based on the analysis of the characteristics and common features of IIDG, a comprehensive load model containing IIDG was constructed; According to the unified model, analytical calculations were performed to derive the state differential equation of the IIDG system and the output equation of the system model. To calculate the state and response of the system at each moment through continuous iteration and switch function updates, a formula for calculating the initial value of the system's state was provided. Combined with the sample data, the unified model identification process was given. Finally, the white shark optimizer (WSO) algorithm was employed to identify the parameters of the model; considering the voltage drop disturbance, the system model was sampled and analyzed. Result The simulation results show that the proposed unified model can better reflect the IIDG characteristics in the case of different levels of voltage drop. Conclusion The modeling error and parameter identification results show that the proposed unified model has good self-describing ability and parameter stability.
2024, 11(6): 174-182.
doi: 10.16516/j.ceec.2024.6.18
Abstract:
Introduction The uncertainty of wind farm brings probability distribution to power generation. The objective and scientific evaluation of uncertainty factors is an important prerequisite for calculating power generation with exceeding probability in wind farm. At present, the industry generally adopts reduction factos to estimate power generation to achieve risk control. Alternatively, uncertain factors are analyzed using probabilistic methods to evaluate the exceedance probability of power generation in wind farms. In view of the simple reduction or neglect of the nature of the uncertain factors, this paper proposes a scientific method to calculate the power generation with exceeding probability in wind farm following the nature of the uncertain factors. Method In this paper, the Monte Carlo simulation method was used to construct the normal probability distribution model of uncertainty factors, to simulate and obtain the statistical results for uncertainty. The wind speed-power generation senitivity factor was applied to determin the uncertainty in wind farm power generation, and finally, the exceeding probability of wind farm power generation was calculate. Result The results of many random simulations by Monte Carlo are concrete functions obeying normal distribution. In this paper, the results of three cases, the standard deviation of uncertainty factor is 12.0%, 14.0%, 16.0% of the average, are simulated. The distribution range of 95% wind speed uncertainty in specific confidence interval is 7.08%～8.56%, 6.97%～8.71% and 6.88%～8.84%, and the distribution range of total uncertainty of power generation is 13.36%～15.92%, 13.17%～16.18% and 13.01%～16.41% respectively. The distribution range of power generation with exceeding probability is 96.06～101.52 GWh, 95.5～101.92 GWh and 95.01～102.26 GWh respectively. Conclusion It is helpful for decision-making to be established on a correct and reliable basis to evaluate the investment risk of wind farm based on the power generation with exceeding probability. The Monte Carlo simulation method is scientific and efficient, and the results obtained have statistical significance.
2024, 11(6): 183-190.
doi: 10.16516/j.ceec.2024.6.19
Abstract:
Introduction To better adapt to the development of distribution network, a flexible DC back-to-back interconnection solution based on integrated gate commutated thyristors (IGCT) devices for medium voltage distribution network is proposed for areas with tight land resources, dense and uneven loads. The solution is analyzed, and reasonable wiring, equipment selection and layout plans are provided. Method Key equipment, such as electrical main connections, switches, converters, DC transformers, bridge arm reactors, as well as their layout, were evaluated and compared. Result The results show that the DC transformer solution offers better adaptability, is oil-free, has no fire safety issues, and results in a smaller overall system volume. Semiconductor switches adopts IGCTs. The converter and the DC transformer adopt "full-bridge + half-bridge" topology. The bridge arm reactor adopts dry-type iron-core reactors. The equipment layout is containerized, making installation convenient and facilitating standardized design. Conclusion The proposed solution meets the practical requirements in terms of feasibility, adaptability, land use and cost, and can guide practical engineering applications.
