Power Transmission Project Research Articles

Research on Evaluation Method of Cost Management and Control Effect of Power Transmission and Transformation Project Based on BIM Technology

The power transmission and transformation project is the carrier of power energy transmission and plays an important role in supporting economic development and improving people's living standards. Based on the application status of BIM technology and the actual situation in power transmission and transformation projects, this paper combs the application fields of BIM technology from the perspective of the whole process of project construction, and constructs an index system based on the construction effect of the whole process of the project. The analytic hierarchy process is used to calculate the index weights, and the expert scoring method is used to evaluate the effects of different projects according to the actual situation, so as to enhance the application scope of BIM technology in the construction of power transmission and transformation projects. The research results of this paper can provide support and reference for the establishment of a construction digital model covering the entire process and resources of a power project, and a BIM system suitable for the power industry.

Distribution of soil corrosion grade in Southern Hebei Province

Transmission towers and substations are used in a variety of natural environments, coupled with the interference of the surrounding production and life, facing the test of soil corrosion. Based on the experimental data of 72 soil samples from five cities in Southern Hebei Province, the soil resistivity, soil pH value and soil moisture content were investigated, and the soil corrosion grade and soil corrosion grade distribution map were obtained. It provides a reference for the collection of soil corrosivity data in power transmission and transformation projects.

Study on Risk Management and Control of Power Transmission and Transformation Project in Power Grid

The thesis conducts research on the risk management and control of power grid infrastructure engineering cost, integrates domestic and foreign research on risk management and control related concepts, combines the characteristics of power grid infrastructure engineering, and establishes power grid transmission and transformation through literature analysis, questionnaire survey, entropy weight method and TOPSIS method. Finally, according to the key risk points determined by the empirical analysis, combined with the current status of the power grid infrastructure project cost risk management, a series of targeted measures and suggestions are proposed for the project cost management. The thesis evaluates the impact of the cost risk factors at all stages of the entire life cycle of the power grid infrastructure project, which can provide a useful reference for the establishment and improvement of the power grid transmission and transformation project cost risk management and control system, and has certain practical significance and reference value. Finally, the paper summarizes and prospects the full text. With the gradual deepening of theoretical research and the increasingly perfect engineering cost risk control system, the results of this research will have greater practical value.

Predicted influence of overhead transmission lines on land-use transfer: A case study on landscape and famous scenery

Taking Baihetan—Jiangsu ±800kV UHVDC power transmission project as an example, the influence of tower foundation on land-use types and functions were predicted using ArcGIS platform and eCognition Developer. Through the construction of land-use transfer matrix analysis, the change of land-use transfer situation and structure were discussed. Our results showed that the forest transfer intensities (RT) of Tangya River Scenic spot and Three Gorges Scenic area were 0.64 and 1.49 respectively, the RT of bushes and grasses in Tangya River Scenic spot and Three Gorges Scenic area were 1.01 and 0.37. The RT of forest, bushes and grasses were both not high. The permanent occupation area of project was all transferred into building land, the construction land dynamics degrees (KT) of Tangya River Scenic spot and Three Gorges Scenic area were +0.40% and +0.031% respectively, which were both low. Thus we drew a conclusion that the project construction would have a slight impact on land use pattern and function and would not affect the overall ecological function and structure of landscape and famous scenery.

Research on Quality Risk Assessment of EPC Projects for Transmission and Distribution Engineering Based on Design Enterprises

Among EPC general contractors, design companies often dominate by virtue of their design advantages. However, due to the complex risks of power transmission and transformation projects throughout their life cycle, quality management is the weak point of the EPC general contractor with design as the leader, and the problems caused by quality risks are directly related to the contractor’s Economic interests and credibility. Therefore, this paper will analyze the potential quality risks in the whole process of the project, establish a risk identification list, and use the fuzzy comprehensive evaluation method to evaluate the quality risk of the EPC project of the power transmission and transformation project led by the design enterprise based on the principle of maximum membership degree.

Cumulative Fatigue Damage Balancing for Modular Multilevel Converter

With many advantages, modular multilevel convert (MMC) has been extensively used in high and medium voltage power transmission projects. The thermal performance and reliability of components in MMC are key issues in system operation. However, in the current research on the reliability of MMC components, there are few methods to improve service lifetime expectancy of the components. This paper proposes a balance control algorithm, based on the cumulative fatigue damage of components, feedback to the control terminal for allocating the sub-module (SM) operating state and generating trigger pulses. Finally, the effectiveness of the proposed algorithm is verified and discussed in case studies. It is found that this algorithm is able to improve the aging degree of components in the meanwhile, the improvement in MMC reliability comes at the cost of slightly increasing capacitor voltage fluctuations and total harmonic distortion (THD). Due to the limitation of capacitor thermal performance, SM capacitor banks become a weak link in MMC reliability.

Schedule Risk Analysis of EPC Project for Power Transmission and Transformation Project Led by Design Enterprise

The advantage of the EPC model is that it can alleviate the contradictions of all parties, integrate resources, and release the owners from management pressure. However, the various risks in the whole life cycle of the power transmission and transformation project are complicated, and the schedule management is the weak point of the EPC general contractor with the design as the leader, and the management of the project schedule is directly related to the profit and reputation of the general contractor. Therefore, this paper will comprehensively analyze the potential schedule risk in combination with the characteristics of power transmission and transformation engineering, and use the set pair analysis principle to establish a fault tree risk analysis model to evaluate the schedule risk of the EPC project of the power transmission and transformation project led by the design enterprise.

Application Research of Full Process Engineering Consulting in Power Grid Engineering Cost Management

The safe and reliable supply of electric energy is an important foundation for ensuring the rapid development of my country’s social economy. In recent years, with the continuous increase in the power demand of the whole society in our country, the scale of investment and construction of power grid projects has continued to expand, strengthening project cost management and improving project investment efficiency has become one of the important goals of investment management of power grid enterprises. The whole process engineering consulting service covers the complete life cycle of the power grid project, from the feasibility study analysis report and feasibility estimation preparation, project preliminary design and preliminary budget preparation, to project decision-making plan, project bidding plan, project whole-process cost management. Completion settlement and final accounts have made important contributions to the investment and construction of power transmission and transformation projects in China.

On control and balancing of rigid bipolar MMC-HVdc links enabling subsystem-independent power transfer

High voltage direct current transmission schemes equipped with modular multilevel converter technology are considered in several realized and planned bulk power transmission projects. Especially in the case of dc cable links with high system lengths, the rigid bipolar configuration presents a suitable compromise between power rating, cost-efficiency and converter redundancy. Caused by the absence of a metallic return path, system degrees of freedom are reduced in contrast to the bipolar configuration with dedicated metallic return. Therefore, the dc currents in positive and negative bipolar subsystem are not independent. This leads to new challenges and motivates the development of advanced control and balancing concepts for rigid bipolar schemes. This paper focuses on balanced and unbalanced ac grid operating conditions with subsystem-independent active power set points in an ac split-busbar scenario, which has not yet been covered in literature. In order to validate the presented methodology, case studies are performed in electromagnetic transient software.

Research on General Model System for Three-Dimensional Design of Transmission and Transformation Project Under Smart Grid Modeling Standards

The traditional design method of power transmission and transformation project based on knowledge model has the problems of rough construction quality and low economic benefit of power transmission and transformation project. Therefore, the design method of power transmission and transformation engineering based on three-dimensional digital intelligent technology is proposed, and the working mode of intelligent power transmission and transformation engineering is designed. Based on this working mode, a three-dimensional collaborative design process for power transmission and transformation engineering is obtained. The design platform is built to shorten the design cycle of power transmission and transformation projects, so that the efficiency of power transmission and transformation engineering design is greatly improved. Through the digital handover of the three-dimensional collaborative database, the transmission and transformation engineering information is sorted and sorted, so that multiple people can view and modify the information at the same time, and the three-dimensional verification process of the transmission and transformation project is designed to achieve a safe distance and collision to the transmission and transformation project. Testing to improve the accuracy of engineering design. Experimental results show that the proposed method can improve the design efficiency and quality of power transmission and transformation projects, and has a higher social and economic evaluation effect.

Research on Application of Three-Dimensional Design Standardization and Three-Dimensional Design Review Method for Transmission and Transformation Project

This paper systematically introduces a three-dimensional transmission and transformation engineering auxiliary design software, and analyses its function, structure and technical characteristics. The main feature of this software is that it has a relatively powerful three-dimensional auxiliary design capability, which can help designers quickly generate a three-dimensional model of power transmission and transformation projects. The three-dimensional model can not only give the project investor an overall image and visual effect of the project during the design bidding stage, but also serve as a reference for the design of the relevant drawings in the later period. At the same time, after having an accurate model, the designer can verify the correctness and reliability of the design, can directly obtain some spatial information, and can dynamically modify, adjust and verify the model as needed. The software also provides related information statistics, query, modification, retrieval and other functions, and provides corresponding drawing management tools according to drawing management specifications. (With the actual application of the system, the design level and technical capabilities of designers will be further improved to ensure that the design work can be completed with high quality and efficiency.

Research of Three-Dimension Design in Infrastructure Project Application

The three-dimensional design of transmission and transformation projects is a new development trend of State Grid Corporation. This article examines the key technical and management constraints of three-dimensional design of transmission and transformation projects from multiple perspectives, and uses three-dimensional design results to carry out exploration and control of construction process. Accumulate experience from collision testing, simulation construction, cost saving, time saving and dynamic management and control of materials and equipment resources to form a three-dimensional construction management and control measure for power transmission and transformation projects. By building the engineering data platform of Hebei Company, the design-infrastructure-operation and maintenance integration is realized. Provide a platform for storage, display and interaction for data sharing and integration in design, construction and operation. Realize the three-dimensional integration, monitoring and analysis of power grid information. To achieve the goal of comprehensively improving the technical and management level of the design and management of transmission and transformation projects of Hebei Company, and to promote the application of digital results in the design of transmission and transformation projects of Hebei Company.

The Intelligent Extraction of Cost Analysis Data of Transmission and Transformation Project Based on Computer Technology

Transmission and transformation project is related to the national economy and people’s livelihood, and its development and construction level is directly related to the national life happiness. The full development of computer technology has brought good news to many fields, and the construction of power transmission and transformation projects has also benefited deeply. This paper probes into the application of computer technology in the field of power transmission and transformation engineering cost analysis, points out the three difficult problems it faces, and gives the corresponding solutions.

Research on Comprehensive Evaluation Model of Investment Benefits of Transmission and Transformation Projects

With the rapid development of our country’s economy, the demand for electric energy from the whole society is constantly increasing. As the infrastructure supporting power supply, the level of investment and construction efficiency is particularly important for supporting social and economic development and supporting the operation and development of power grid companies. Under these conditions, the comprehensive evaluation of the investment and construction benefits of power transmission and transformation projects is of great practical significance to enhance the management level of China’s power transmission and transformation projects, improve the quality of project construction, and improve the level of utilization of project investment funds.

Ecological Regionalization for the Ecological Protection in Power Transmission and Transformation Projects

Ecological Regionalization for the Ecological Protection in Power Transmission and Transformation Projects

Influence of protrusions on the positive switching impulse breakdown voltage of sphere‐plane air gaps in high‐altitude areas

The construction of ultra-high-voltage direct-current power transmission projects in high-altitude areas calls for the research into the discharge characteristics of the air gaps in the valve hall of a power converter station in such areas. Tests on the switching impulse discharge characteristics of the sphere-plane air gap were conducted at Yangbajing test base (Tibet, China) at an altitude of 4300 m on conditions that there were burrs on the 1.3 m diameter shield balls. The discharge characteristics, under the influences of burrs with different lengths and locations, were obtained and compared with test data from low-altitude areas. The results indicate that the arrangements of burrs with different lengths and locations can significantly reduce the switching impulse discharge voltage of sphere-plane air gaps, while the voltage sag gradually decreased down with increasing burr length. Moreover, the larger the sphere-plane air gap is, the smaller the influence of such burrs have. High altitude also substantially decreased the switching impulse discharge voltage of the air gap. When the surface of shield balls was smooth, the U50 saturation of the air gap was more significant than at low altitude; however, if there were burrs on the shield balls, the saturation effect was less significant.

Optimal sizing of wind-hydrogen system considering hydrogen demand and trading modes

In order to make full use of renewable energy and improve the utilization of wind power, a new joint optimization scheme of the wind-hydrogen system coupled with transmission project is proposed in this paper, in which wind power is reasonably allocated for grid integration and for hydrogen production. Aiming at maximize the annul wind-hydrogen system benefit, the optimal sizes of wind power transmission project and hydrogen system are obtained under different hydrogen production modes, hydrogen trading modes and hydrogen demand levels. In addition, the penalty cost of wind curtailment and hydrogen supply shortage and the system environmental benefits are taken into account. Results show: during the long-term of insufficient of wind power, it is better to produce hydrogen using wind power and grid-assisted power to avoid hydrogen supply shortage; considering the future increase of hydrogen demand, the optimal supply number of hydrogen refueling stations in the wind-hydrogen system is two. Also, the low utilization of fuel cells means that the benefit from regeneration cannot offset the high cost, which leads to the abnegation of fuel cells in the wind-hydrogen system.

A Review on the Geopolymer Materials Used in Grouting Piles

Bored cast-in-place piles are often used in power transmission projects. However, common bored cast-in-place piles with mud wall protection had some shortcomings, such as complicated construction procedure, poor quality of concrete, low bearing capacity, and pollution caused by mud wall protection. In this paper, the construction technology, quality evaluation method and design calculation of the new technology of Continuous Flight Auger pile were summarized. In addition, this technology combining geopolymer high strength concrete material was proposed, and the application of this technology in power transmission projects was prospected.

Research on Optimization and Improvement of Power Grid Engineering Equipment Materials under Extreme Rain and Snow Conditions

The construction of power grid engineering is developing more and more rapidly. In order to ensure the large-scale construction of power transmission and transformation projects, in the field of equipment and materials, it is necessary to eliminate the construction equipment of special equipment such as over-time service and equipment, and increase the amount of high-performance materials. The research and development of equipment materials should focus on specialization, standardization, and serialization to carry out innovative research and development, thereby improving grid construction efficiency, improving safety and quality levels, and completing power grid construction tasks. In recent years, with the rapid construction of UHV and other power transmission and transformation projects, the construction level and technical innovation capability of construction equipment have a great impact on the construction of the project, especially in the face of extreme rain and snow, how to ensure the strength of the material and meet the requirements. It is especially important.

Three Dimensional Information Sharing Platform of Power Transmission and Transformation Based on Grid Information Model (GIM)

Grid information model (GIM) is a technical standard formulated by State Grid Corporation of China to meet the needs of three-dimensional design of power transmission and transformation projects [1]. According to the characteristics of GIM data, this paper studies the design of distributed computing technology and service architecture to realize the online analysis and optimization of GIM data, so as to improve the efficiency and performance of GIM data analysis. Based on WEBGL technology, with the help of 3D tiles’ LOD ability and the openness of format, a 3D information sharing platform for power transmission and transformation is built to realize the efficient and smooth loading, display and sharing of GIM 3D data on the web.