Power Transmission Project Research Articles

Comprehensive benefit evaluation of Carbon reduction in power transmission and transformation projects by TOPSIS method based on combination weighting

Abstract With the continuous promotion of carbon peak carbon neutrality, the investment and construction of new power systems have accelerated, and the construction of a low-carbon economy has become an inevitable trend of the transformation and development of power transmission and transformation projects. In this paper, the FAHP and entropy methods are used to evaluate the economic, social, and social benefits of carbon reduction in power transmission and transformation projects and finally establish a set of comprehensive benefit evaluation systems for carbon reduction in power transmission and transformation projects. Under this evaluation system, the comprehensive benefit of 220 kV power transmission and transformation project in A province is sorted by entropy weight-TOPSIS method. The comprehensive benefit of power transmission and transformation project B >C >A project is finally obtained. At the same time, in the sub-criteria of economic benefits, the index of “enterprise asset-liability ratio” has the largest comprehensive weight. The “using distributed energy generation” index has the largest comprehensive weight in the sub-criteria layer of carbon reduction benefit. In the subsequent construction of power transmission and transformation projects, enterprises can prioritize improving the above indicators to improve carbon reduction efficiency and economy.

Comparative Study on Economic Benefit Evaluation Methods for Power Transmission and Transformation Construction Projects Under DB Mode

By introducing and comparing the commonly used economic benefit evaluation methods for power transmission and transformation construction projects under the Design and Build(DB) mode, the paper investigates which method should be used for different purposes of economic benefit evaluation. On this basis, the advantages and disadvantages of these methods and their application conditions have been discussed in depth so as to provide useful references for the economic evaluation work.

Design and application of a power frequency electric field measuring device for a high‐humidity environment

AbstractThe power frequency electric field is the most important electromagnetic environmental factor in alternating current power transmission projects. The humidity has a negative influence on available electric field measuring devices, which may lead to discrepancies of up to seven times the actual value at a relative humidity exceeding 80%. The changes in the support and probe shell impedance may be the reason for the error. The optimization measures include modifying the communication mode, designing a suitable structure and circuit for the probe, and using composite insulating material with strong hydrophobicity for the support. A three‐axis omnidirectional electric field measuring device was developed based on wireless communication and composite support. The variation of the measured electric field strength value is less than 1% at relative humidities ranging from 45% to 90% in the laboratory, and the measured results obtained in high humidity at the high‐voltage test site and under the transmission line demonstrated high accuracy. The research demonstrates that the composite support can be used to improve the performance of conventional devices. The proposed device can better meet the needs for accurate measurement of electric field strength in a high‐humidity environment and overcome the technical problems raised by the IEC standard.

Carbon emissions of power transmission and transformation projects in the whole life cycle for smart sustainable energy systems

The study investigates the optimization of life cycle carbon emissions in smart sustainable energy systems through power transformation and transmission project power load predictions. Firstly, a multi-task learning-based short-term user load forecasting technique is developed, where the power load curves of multiple residential customers are grouped and classified using the K-means clustering method. Additionally, the Bidirectional Long Short-Term Memory (BiLSTM) technique is introduced to anticipate the power load intelligently. Secondly, a life cycle carbon emission assessment model for the power transmission and transformation project (PTTP) is constructed based on the life cycle assessment (LCA) method, which divides the project's life cycle into four stages: production, installation and construction, operation and maintenance, and demolition. Finally, an experimental evaluation of this model is conducted. The results demonstrate that compared with the baseline model Long Short-Term Memory (LSTM), this model achieves a significantly lower average Mean Absolute Error (MAE) at 3.62% while achieving significantly higher accuracy in power load forecasting at 94.34%. A comprehensive examination of carbon emissions across all four phases reveals that overall carbon emissions are highest during the operation and maintenance stage followed by the equipment production stage and installation/construction stage, with the lowest overall carbon emissions observed. Hence, this study endeavors to forecast power load demand with precision and identify the principal determinants of carbon emissions in power engineering. By discerning and managing these key factors, an optimal, energy-efficient intelligent power load scheme can be derived.

Analysis Of the Influence Mechanism of Power Market Reform Affecting the Power Transmission and Transformation Construction Projects Under the DB Mode

Under the background of the new round of power market reform, the power transmission and transformation construction projects are faced with many new influencing factors. Therefore, the article firstly uses the Delphi method to sort out the influencing factors faced by the power transmission and transformation construction projects built under the Design and Build(DB) mode, and categorize various influencing factors into four dimensions; then analyses the interaction mechanism between the influencing factors by constructing an interpretative structural model of the influencing factors of the power transmission and transformation project construction, and builds a hierarchical structure diagram of the influencing factors. Based on this hierarchical structure diagram, the origin factors and process factors of the influencing factors can be clearly seen, as well as the risk transfer chains of five major influencing factors, including diversified electricity sales entities and opening up of newly-added power distribution network. Finally, based on the five risk transfer chains, specific suggestions have been proposed for the construction of power transmission and transformation projects after the new round of power market reform.

Comprehensive Evaluation and Scheme Optimization for Power Transmission and Transformation Projects with the Adoption of Carbon Reduction Technologies

To investigate the economic impact of carbon reduction technology on power transmission and transformation projects, carbon reduction technologies adapted to power transmission and transformation projects were investigated, and the evaluation indicator system for cost-benefit in power transmission and transformation projects was established based on AHP (Analytic Hierarchy Process) and EWM (Entropy Weight Method). Taking 110 kV and 220 kV transmission and transformation projects in a province located in northwest China as an example, a sensitivity analysis was carried out for the weight of each carbon reduction technology. Additionally, based on the evaluation indicator system, eight alternative carbon reduction schemes were proposed, and the net present value and scheme scores were analyzed with TOPSIS (Technique for Order of Preference by Similarity to Ideal Solution). The results showed that in the criterion layer of the 110 kV case, the highest proportion of weight is “high-efficiency transformer”, accounting for 34.12%, and in the indicator layer, the highest proportion of weight is “ parasitic losses”, accounting for 12.35%. After conducting error analysis on the 110 kV and 220 kV cases, it was found that the errors were within an acceptable range both in the criterion layer and index layer. Moreover, it is expected to achieve greater economic benefits through lower costs according to Scheme VI, and due to the limitations of carbon reduction technologies and the lack of a relevant policy system, it is difficult to achieve the goal of covering costs with benefits for the eight schemes studied.

Knowledge reasoning in power grid infrastructure projects based on deep multi-view graph convolutional network

With the rapid development of power grid infrastructure, especially the increasing number of ultra-high voltage (UHV) projects, knowledge extracted from historical engineering data is collected and can be potentially used to assist in the review of power transmission and transformation projects. However, conventional knowledge modeling and knowledge reasoning methods cannot meet the current needs of power grid construction. In this paper, considering the more supernumerary and distinctive information brought by multi-view data which could be beneficial for feature representation and knowledge reasoning from the constructed knowledge base, a multi-view graph convolutional network (GCN) based on knowledge graph is proposed to make classification for power grid infrastructure projects. Specifically, several views are constructed based on attribute information of a knowledge graph. In addition, a Haar convolution-based pooling mechanism is employed to capture the structural features represented by a chain of subgraphs. And then an aggregator that combines both attribute and structural information is used to classify UHV projects. Results from both UHV and NCI-1 datasets indicate that our proposed method is more has higher accuracy and generalization ability.

Carbon Emission Accounting during the Construction of Typical 500 kV Power Transmissions and Substations Using the Carbon Emission Factor Approach

Carbon emission calculation during power transmission and substation construction provides valuable insights into the trend of carbon emissions and the development of low-carbon power grids. In this regard, this study divides the power transmission and substation construction process into production, transportation, and construction stages based on the sources of carbon emissions and employs a life cycle assessment to calculate the total carbon emissions using the carbon emission factor method for typical 500 kV projects. The results show that in the construction process the production stage contributes the most carbon emissions, with material and equipment production for power transmission accounting for 78% and 14% of the total emissions, respectively. The transportation and construction stage contribute 1% and 7% of the total emissions, respectively. For substations, material and equipment production contribute 67% and 30% of the total emissions, respectively. The transportation and construction phases contribute 1% and 2% of the total emissions. Through the qualitative and quantitative analysis of the carbon emission results, the construction scale and the topography and geology have significant impacts on carbon emissions from power transmission and substation projects. Finally, some targeted recommendations for carbon emission reduction for power transmissions and substations are proposed based on the influencing factors of each stage of the construction.

Design Capability Evaluation and System Development for Power Transmission and Transformation Engineering

Power transmission and transformation engineering is a pivotal aspect of power grid construction and an important link to power grid planning. It holds substantial relevance to the economic to the economic, social, and environmental benefits of China’s power construction. Consequently, the design of power transmission and transformation engineering, as the source of power transmission and transformation project construction, holds notable importance. In this paper, the evaluation system of design capability for power transmission and transformation engineering was established from the dimensions of basic hard strength, design bearing capacity, result quality control, deviation control, and technological innovation capacity. The weight of the evaluation indicators of the design capacity of power transmission and transformation engineering is determined based on advanced design units and data analysis combined with expert experience. On this basis, the corresponding evaluation system of design capability was developed. The application of this system provided accurate basic data for the evaluation of design capabilities in power transmission and transformation engineering. The design capability assessment report issued can help provincial companies comprehensively evaluate the design capabilities of various design units, thereby promoting standardized management of design units.

Application of Simple Freight Ropeways in Power Transmission and Transformation Projects

Application of Simple Freight Ropeways in Power Transmission and Transformation Projects

Analysis of Technical and Economics High Voltage Overhead Transmission 150 kV Development in Industrial Area of High Voltage Consumers PT. Lotte Chemical Indonesia

In order to increase revenue, PT PLN (Persero) entered into a power purchase agreement with PT. Lotte Chemical Indonesia Cilegon. investment in the relocation of 150 kV high voltage overhead lines. This research is very important as a small-scale simulation given the large number of electric power transmission projects implemented by PLN. This study analyzes the impact of the relocation of the 150 kV T/L and found that the existing material that was dismantled was either utilized/not reused so that it has the potential to increase/decrease investment for PLN. The research method is in the form of data analysis on the feasibility study of the PLN project. Calculation analysis by calculating the value of existing assets which is then used as a reference in calculating sensitivity analysis which is then determined 3 scenarios using financial indicators IRR, NPV, B/C Ratio and Payback Period (PB). The results of the study show that scenarios 1, 2 and 3 have positive IRR and B/C ratio values and there is a difference of 1 year for the payback period between scenarios 1 and 3 vs scenario 2 and the highest NPV is in scenario 3.

Offshore Wind Power Transmission Decision-making Based on Grey Correlation and Topsis

With the profound transformation of the global energy structure, the development and utilization of wind energy have become the focus of global attention. The offshore wind power industry has ushered in a historic development opportunity and China’s offshore wind power industry has entered the fast track of development. However, due to the variety of transmission schemes available for offshore wind power, there are many differences in the economy, reliability, environment, risk, and other aspects of different transmission schemes, so it is difficult to make the optimal decision. To comprehensively compare the advantages and disadvantages of different transmission schemes in actual scenarios, this paper first identifies their influencing factors to obtain an evaluation index system and uses the entropy weight method to determine the index weight based on the index evaluation data of typical offshore wind power transmission projects at home and abroad, and the grey correlation method and TOPSIS method are integrated to build a comprehensive evaluation model suitable for offshore power transmission. Finally, the scientific and rigorous nature of the research method and model is verified by example analysis. The optimal decision comprehensive evaluation model constructed in this paper can realize scientific and comprehensive evaluation of offshore wind power transmission schemes and has important decision-making significance for the selection of transmission schemes in different scenarios.

Converter valve state evaluation method based on hierarchical graded fuzzy theory

As the core equipment of the DC power transmission project, the operation status of the converter valve is the key to the safety and stability of the DC system. Existing assessment methods cannot accurately assess the health status of the converter valve in project operation. According to the independence of the function and structure of each component of the converter valve, this paper proposes a converter valve state evaluation method based on hierarchical grading fuzzy theory. The data used are various information characterizing the state of the converter valve, such as voltage, current, sound, image, and other data. According to hierarchical grading, the evaluation index system is constructed. Based on the fuzzy theory, the affiliation function is proposed, and the affiliation probability of four hierarchical states is output for the state evaluation results of the converter valve and its group components. Experiments show that the method improves the accuracy and practicability of converter valve evaluation in engineering sites.

Analysis on the construction and application of comprehensive evaluation index system of construction quality of power transmission and transformation project

As the basic project of urban construction and development, power transmission and transformation project mainly provides sufficient power resources for urban residents, so the construction quality of the project determines the work efficiency and service quality of the power industry. With the continuous development of social economy and science and technology, the number of power transmission and transformation projects in our country is increasing, the scope of project construction is getting larger and larger, and the actual construction period is getting smaller and smaller, which leads to the quality of the project itself is not guaranteed. Therefore, on the basis of understanding the construction status of power transmission and transformation projects, this paper mainly explores how to construct the comprehensive evaluation index system of power transmission and transformation projects construction quality, and analyzes the corresponding management measures from the perspective of project construction.

Discussion on feature enhancement technology of audit object of power transmission and transformation project settlement based on remote sensing technology

In the rapid development of social economy and science and technology, the construction management of power transmission and transformation project began to widely use modern science and technology theory, the most representative of which is remote sensing technology. According to the data obtained by UAV digital policy image and digital surface model, soil and water conservation measures and engineering prevention and control monitoring are proposed in the integrated analysis and calculation research, which can provide technical support for the construction management of power transmission and transformation projects. Therefore, on the basis of understanding the technical content of transmission and transformation engineering line construction, this paper mainly explores the transmission and transformation engineering monitoring system based on low-altitude remote sensing technology of drones and builds an intelligent transmission and transformation engineering settlement audit platform according to the current development status of transmission and transformation engineering completion settlement audit. The final practice case proves that the remote-sensing technology based power transmission and transformation project settlement audit effect is stronger, which meets the needs of power transmission and transformation project construction management in the new era.

Study on debugging of lightning impulse voltage waveform for large capacity ±800kV converter transformer in high altitude area

The Qinghai-Henan ±800kV UHV DC power transmission project is an UHV channel specially constructed for clean energy delivery, ±800kV converter transformers of the project are assembled and tested in Xining at an altitude of 2500 m, full-wave lightning impulse test is one of the main means to evaluate converter transformer insulation performance, its valve side lightning impulse voltage waveform parameters often fail to meet IEC60076-3 standards because of the large winding to the ground capacitance. In order to effectively assess the lightning tolerance of converter transformer, a simulation model of impulse test circuit of ±800kV converter transformer was built based on the existing 6000kV/560kJ impulse voltage generator and ATP-EMTP simulation software, three kinds of optimization methods are proposed, which include increasing the wavetail resistance, increasing load capacitor, and connecting the wave head in parallel with different inductors, the results show that the single optimization method can not meet the waveform requirements. Therefore, a combinatorial optimization test method of increasing the wavetail resistance and connecting the wave head in parallel with different inductors is proposed, which is completed and verified in the full-wave lightning impulse test on the valve side of Qinghai ±800kV high-end converter transformer, the results show that the optimized test waveform parameters meet the standard requirements.

Study on vegetation restoration technology in ecologically sensitive area of power transmission and transformation project in Sichuan-Chongqing area

In the rapid development of urban construction, China's power transmission and transformation engineering construction scope is more and more wide, in order to better cope with the opportunities and challenges proposed by the development of The Times, the National Grid Co., Ltd. technical research team in the proposed a number of key technologies at the same time, mastered a lot of theoretical knowledge and practical experience, which for the new period of ecological environmental protection laid the foundation. Especially for the Sichuan-Chongqing area, the vegetation restoration technology must be considered in the construction management of power transmission and transformation projects during the construction of ecologically sensitive areas, only in this way can the construction requirements of safe production and green environmental protection be met. On the basis of understanding the construction management requirements of power transmission and transformation projects in Sichuan-Chongqing area, and according to the construction status of ecologically sensitive areas during the construction period, I mainly study the construction identification system and construction evaluation system of projects in ecologically sensitive areas, and propose effective vegetation restoration technology according to the requirements of construction sites, so as to ensure the normal operation of power transmission and transformation projects in Sichuan-Chongqing area.

Study on ecological protection and vegetation restoration model of power transmission and transformation project construction in typical ecologically fragile areas in western China in the new period

In the new era of construction development, ecological poverty caused by the deterioration of ecological environment has become one of the regional characteristics of poverty in the western region, therefore, to the typical ecological fragile areas of power transmission and transformation construction problems, ecological protection and vegetation restoration, is the main problem of our country's scholars. After understanding the basic status quo of ecologically fragile areas in western China, this paper mainly studies the ecological protection and vegetation restoration model of power transmission and transformation construction in typical ecologically fragile areas in western China in the new era according to the impact of power transmission and transformation projects on ecological environment, so as to provide basic guarantee for engineering construction and industry development.

Study on ecological environment impact and soil and water conservation technology of power transmission and transformation projects in typical ecologically fragile areas in western China

In the steady development of social and economic, the field of power transmission and transformation engineering construction in our country gradually forms a new electric power development pattern, providing a solid foundation for the innovative development of electric power enterprises in a new era. Since power transmission and transformation projects will cause serious soil and water loss, which will have a direct impact on the stability of ecological environment in various regions, which is not conducive to the construction and operation of power transmission and transformation projects and the long-term development of social economy, how to construct a safe and standardized construction environment, scientifically deal with the ecological environment problems of power transmission and transformation projects, and rationally use soil and water conservation technology? It is the main problem that Chinese scholars study and discuss at present. On the basis of understanding the environmental status of typical ecologically fragile areas in western China, and according to the development of soil and water conservation technology in power transmission and transformation projects, this paper mainly studies the online monitoring system and application technology of soil and water conservation for power transmission and transformation projects in a certain area, so as to provide effective basis for the construction management of power transmission and transformation projects in the new era.

The optimization model of soil and water conservation ecological construction for power transmission and transformation projects in ecologically sensitive areas in Sichuan and Chongqing area in the new era is analyzed

In the construction and development of modern society, the overall characteristics of soil and water conservation ecological construction are not only reflected in the coordination of biological measures and engineering measures, but also in the sustainable development of economy and technology, which is the fundamental demand of the comprehensive treatment and optimization model of soil and water conservation for power transformation projects in ecologically sensitive areas of Sichuan and Chongqing in the new era. Therefore, after understanding the development requirements of ecological sensitive areas in Sichuan-Chongqing area, this paper mainly studies the optimization model of ecological construction of soil and water conservation according to the construction management content of power transmission and transformation projects, so as to provide technical support for urban construction and development in the new era.