In order to improve the safety management level of sluice project construction and the traditional manual management mode, this paper proposed the automatic identification process of large-scale sluice project construction hazards based on the database and BIM technology. For solving the low efficiency of construction safety management, database and BIM technology were used to store the large-scale sluice project construction hazards sources. A identification system of large-scale sluice project construction hazard was developed by using computer Technology, which improves the efficiency of sluice project construction safety management and provides reference for information management of construction hazard sources.

The plane gate controls water storage and discharge by opening and closing, and is easily damaged by the pulsating pressure of the water flow during operation. In order to study the interaction process between the opening and closing motion of the gate and the flow through the gate, this paper firstly conducted a three-dimensional numerical simulation of the flow through the gate during the opening and closing process of the gate under different bottom edge forms. And then the Hilbert-Huang transform was used to analyze the flow through the gate, and the time-frequency-amplitude information of the signal. The information analysis and comparison found that the bottom edge of the combined gate with a forward tilt of 45° and a backward tilt of 30° is gently affected by the pulsating pressure at the bottom of the gate, and the change difference of the energy amplitude at the measuring point was the smallest, and the water flow state was relatively stable. This study can provide a reference for the analysis of the pulsating pressure of the water flow through the plane gate.

Aiming at the problems such as unstable design quality, long design cycle and large repetitive workload in the current gate design, based on the whole process three-dimensional parametric design concept, and according to the design specifications and manuals, a three-dimensional parametric design method for the whole process of gate is proposed, that is, the three-dimensional parametric geometric modeling, spatial structural analysis and engineering drawing of plane gate structure are realized on the same platform by writing corresponding programs. This method can make the gate structure transition from plane design to space design, make the design process more intuitive, improve the quality and efficiency of the design, reduce the repetitive workload caused by design changes in design process.

In order to realize the timing matching and disposing of the main alarm information of the hydropower centralized control platform, a timing matching and disposing model was constructed based on Python data visualization. The model transmitted the fault information of hydropower station equipment to the receiver of hydropower centralized control platform by using communication server, and the fault alarm sequence was generated. After matching the main fault alarm information according to the time sequence matching rules in the domain expert matching rule base, state function and state change function were used to analyze the time sequence characteristics. Then the mapping table was used to describe the timing characteristics of the main alarm information. After analyzing the timing characteristics of the main alarm information, the timing matching and disposal of the main alarm information in the hydropower centralized control platform were realized. Experimental results show that the model has good visualization ability of main alarm information, and the coverage rate of main alarm information crawled by the model is up to 98.99%. The model has higher Pearson correlation coefficient and better ability to deal with the main alarm information.

At present, BIM technology has been applied in some majors of water conservancy and hydropower engineering projects, but it has not yet formed the overall collaborative design and systematic digitalization of the whole process. This paper aims at the characteristics of the Jinchuan Hydropower Station project with high positioning, deep covering of the face rockfill dam, complex geological conditions of the diversion power generation system and the actual needs of the project. The whole process of 3D BIM design has been implemented, the standard system has been clarified, and digital surveys have been carried out for all majors and all stages. This research realizes BIM collaborative design, application of 3D design results, dynamic update, and the whole process of lightweight digital handover on web and mobile terminals, establishes a digital achievement management platform, and lays a data foundation for smart engineering and digital power plants. At the same time, the "BIM+" multi-source data management has been carried out to realize the functions of BIM-based geological forecasting, construction progress management, dynamic feedback analysis, and intelligent management of safety monitoring, which provides a platform basis and theoretical guarantee for safety risk control and lean construction management. This research provides a reference for the whole-process, all-professional overall collaborative design and systematic digital application in other hydropower projects in the future.

UHV DC wall bushing is the neck-jamming technology of China’s power grid. At present, not only its core design and manufacturing technology still have many difficulties to be overcome, but also the state monitoring technology of its equipment operation is also a hot issue. This paper explores the application of an on-line monitoring technology based on vibration signals in UHV DC wall bushings. On the basis of analyzing the structure and common faults of UHV DC wall bushings, theoretical simulation research is carried out. It is found that when the outdoor insulation or inner insulation of the UHV DC wall bushing is damaged, the fundamental characteristic frequency of the bushing changes significantly. Afterwards, this paper carried out fault simulation and vibration tests on the cracking of capacitor core and the rupture of silicone rubber shed of the 800 kV UHV DC wall bushing. The results show that the fundamental characteristic frequencies of the bushing under different fault conditions are quite different. Therefore, the use of vibration monitoring technology can effectively identify the faults of UHV DC wall bushings, which can provide technical reference for UHV engineering construction and operation and maintenance personnel.

In order to study the ion flow field problem near the ground of UHV DC transmission lines, the BPA method is applied to solve the ion flow field of bipolar DC transmission lines. The synthetic electric field is solved combined with the nominal electric field calculated by the successive image method. The ion flow field and synthetic electric field problems of ±800 kV DC transmission lines are calculated using the BPA method, and the effects of erection height, interelectrode distance, and sub-conductor radius on the synthetic electric field of UHV DC transmission lines are analyzed. In addition, the power-line method for solving the synthetic electric field strength is compared. The results show that the BPA method is accurate and effective in solving the ion flow field, and the calculation efficiency is greatly improved. Increasing the height of the wire erection and increasing the radius of the split sub-conductor can improve the electromagnetic environment near the ground, while reducing the interelectrode distance can reduce the synthetic electric field intensity near the ground, but the effect is not obvious.

To address the challenges in oil leakage image recognition of peak regulation power equipment, a new method is proposed by introducing logical rule discrimination strategy into the task of image recognition. The technology of histogram equalization is adopted to improve original image. Then Mask RCNN network is introduced to obtain the preliminary location and contour information of storage device, ground and suspected oil area. Based on the above information, positional relationships between objects are judged, and logical expressions are adopted to determine the oil leakage area. Example analysis is conducted based on filed images of peak regulation power equipment. The results indicate that the proposed framework solves the problems in oil leakage area recognition, largely boosting model performance.

For the task of condition evaluation of peaking power equipment, the monitoring indicators are defined as a set of time series, among which the complex coupling relationships need to be considered. Besides, requirements on processing time are introduced by the real-time systems. A new framework is proposed to address these problems via the technology of parallel feature extraction as well as data fusion. The time series are statistically analyzed in parallel where multiple hypothesis testing is used to select the important features. Using a defined hierarchical graph convolutional network, the related information is integrated for the final condition evaluation task. Compared with the existing models, experiments indicate that the proposed method with stronger transferability and shorter processing time has a much higher predication accuracy.

In the weak current network, due to the large impedance characteristics of the power grid, the impedance parameters in the line change the key parameters of the rectifier control, affecting the overall performance of the rectifier, which may lead to the unstable output of the rectifier, and the output presents the characteristics of sub-synchronous oscillation. On the basis of not increasing the hardware compensation system, this paper proposes a control strategy that can effectively suppress the sub-synchronous oscillation. Based on the mathematical model, the AC current component of the sub-synchronous oscillation is extracted through the low-frequency filter. After d/q transformation, the d/q current component of the sub-synchronous oscillation is PI closed-loop controlled. The output value of the PI regulator of the subsynchronous oscillation component is decoupled and compensated, and then multiplied by the compensation coefficient to obtain the d/q compensation component of the voltage. The output of the original current inner loop is compensated. A simulation and test results show that the control strategy is effective and feasible, which can suppress sub-synchronous components.