Machine learning methods play a key role in solving forecasting challenges in the electric power industry, including those related to electricity consumption. However, improving the efficiency and robustness of machine learning models requires more research besides hyperparameter tuning and architecture optimization. This study aims to develop a model that can predict the daily load schedule with corrections. For this, an ensemble adaptive boosting algorithm was used. The algorithm was implemented using the Scikit-learn machine learning library in the Python programming language. The study focuses on the central power system of Mongolia. Actual energy consumption data and meteorological factors from January 1, 2019, to October 10, 2024 were used as the initial data. The models were tested during the trial operation of the developed system from December 1 to December 10, 2024. The adaptive boosting model was found to enable forecasting of the daily load schedule with an average error of 31.4 MW(2.4
Digital technical guidance documents of electric power industry, especially in the field of relay protection and automation, significantly enhance the development and examination of design documentation. The present paper considers an approach to the development and examination of digital technical guidance documents for relay protection and automation to generate the requirements for design solutions using artificial intelligence (AI).
The present paper describes a method for identifying increased dynamic eccentricity of high-voltage induction motors for power plant auxiliaries. The method is based on spectral analysis of the external magnetic field during motor run-down. Diagnostic signs of increased dynamic eccentricity that can be detected in the spectrum of the external magnetic field are presented. A method for signal processing that ensures sufficient reliability of results is proposed; conditions for method application are described. The method is tested on simulation models of high-voltage induction motors, as well as on several real electrical machines. The obtained test results confirming the possibility of determining increased eccentricity during operation are consistent with other studies conducted on induction motors.
The article examines the specific features of conducting laboratory experiments aimed at estimating overflow and splash discharge per unit width under the impact of design waves on port hydraulic structures (PHS) in conditions of sea level rise due to global climate change. The analysis of the findings reported in climatological studies enabled us to determine that for ports located in the Arctic and Far Eastern regions of the Russian Federation, sea level rise may exceed one meter by the end of the estimated service life of the facilities under the SSP3-7.0 and SSP5-8.5 socioeconomic scenarios used in the sixth assessment report of the Intergovernmental Panel on Climate Change (IPCC).We have developed and tested a new technique for conducting laboratory experiments. It enables a quantitative evaluation of the sea level rise impact on the PHS operating conditions.
The article describes a fundamentally new resource-saving technology in the form of a location method and equipment for monitoring damage and ice on the wires of overhead power lines with a voltage of 35 – 330 kV, first implemented at substations in Russia and having no analogues in the world. The article shows a technique for identifying reflected pulses among high-frequency communication interference, as well as methods for identifying the most accident blackspot of the line under icy conditions. Examples of manufactured hardware and software location complexes for monitoring overhead power lines are given. The scheme of placement of six location complexes in Russia with control of their operability from the Monitoring Center located in Kazan (KSPEU) is analyzed. The advantages of location monitoring of overhead power lines over currently monitoring methods are shown.
The riverbed powerhouses of run-of-river hydroelectric power plants (HPPs) and the water-retaining powerhouses of pumped-storage power plants (PSPPs) are widely used and share structural similarities. One key component is water-retaining walls, which withstand hydraulic loads and transfer forces to floors and other structural elements of the building. Over prolonged operation, the upstream reinforced-concrete walls of turbine halls and shield walls may require strengthening, for example, with composite materials. Planned experimental studies will investigate reinforced-concrete models of wall and floor fragments of HPP and PSPP powerhouses, incorporating reinforcement with prestressed basalt fiber-reinforced polymer (BFRP) bars (two experiments have already been conducted), as well as carbon fiber-reinforced polymer (CFRP) tapes. Additionally, numerical simulations will be carried out using three-dimensional finite-element models of buildings.
Composite modeling of wave conditions for the protective structures of a seaport is demonstrated. The study incorporated both numerical and physical wave modeling. The impact of waves on port structures near the approach channel was analyzed. The results obtained from numerical models-including ARTEMIS, SWAN, HARES, SWASH, and MIKE 21 BW-as well as physical modeling conducted at Delft and MSUCE, are analyzed.
Ice jam release waves are studied. Theoretical, laboratory, field, and numerical studies are reviewed retrospectively. The numerical results obtained using the authors’ models are presented. Their advantages are demonstrated.
The study aims to hydraulically justify the efficiency of the parameters of the stilling basin elements below the shaft spillway of the 16 Tishrin Dam in the Syrian Arab Republic. Such devices enable dissipation of excess kinetic energy of the flow. Moreover, they are used to monitor the occurrence of deformation in the downstream reach. Thus, the elements ensure the reliability and safety of the dam and the spillway during long-term operation and at high flood flows.
The article considers the experience of model-based design in developing a DC link control system. Model-based design reduces the time for developing algorithms, as well as for implementing and testing software for embedded control systems based on microcontrollers and field-programmable gate arrays. More than 50
The article presents a study and software solution for condition diagnostics, fault risk assessment, and adjustment of the brush gear assembly in synchronous machines based on current distribution analysis.
The analysis of accidents of power and energy plants (PP and EP) from the point of view of the concept of self-liquidation of the system (technical, biological, economic, etc.) as such is performed. Accidents with serious consequences up to catastrophic destruction are considered. The self-liquidation of a mechanical (oscillating) system is based on the asynchronous running-in by the rotor of the stator (bearings, housing) in the process of oscillations with hitting. Triggers of the run-in process are defined and a certain continuum of the asynchronous run-in development process is considered. On the basis of the analysis of accidents the modelling of the running-in process with revealing of a new class of forces (contact interaction forces), contributing to the self-excited rotor oscillations is carried out. The level of contact interaction forces is orders of magnitude higher than other excitation forces in the rotor-stator system (in bearings, in the flowing part). In the process of running-in the rotor-stator system itself (at the expense of rotor rotation energy) increases the angular speed of precession bringing it to the nearest resonance of the rotor-support system with additional coupling at the point of contact. Self-liquidation of SU and EA occurs in a new resonance zone.
The limit of long-term strength and destruction of pipe metal from a set of superheater spare parts are investigated. It is shown that softening characterizes the durability parameter of I. I. Trunin, structural transformation —the relative content of molybdenum in carbides. Formulas for calculating the allowable stress in the metal, the equivalent operating temperature and the resource characteristics of coils are proposed.
Malfunctions in the control and steam distribution systems of steam turbines lead to reduced accuracy and stability in maintaining the controlled parameters of power units, and may result in sudden load changes or turbine trips. To monitor the condition of turbine control and steam distribution systems, the Technical Operation Rules for Power Plants and Networks of the Russian Federation require periodic inspections and testing. However, long intervals between inspections and the subjective nature of data interpretation often impede early detection of incipient defects, making it difficult to timely identify and eliminate their causes. The implementation of electrohydraulic control systems (EHCS) based on modern microprocessor technology makes it possible to automate these inspections and tests and improve their consistency and objectivity. Additionally, EHCS enable the use of additonal diagnostic algorithms for the control and steam distribution systems of steam turbines.
The arrangement and phase displacement group of the winding of three-phase power transformers are the key parameters that determine the operating mode (currents and voltages) of the transformer. Current regulatory documents, in particular GOST and IEC standards, recommend methods for determining the phase displacement group of the winding. However, guidelines for determining the winding arrangement are lacking. A method for determining the winding arrangements of three-phase transformers is developed based on theoretical and experimental studies and measuring no-load losses at low voltage. The method can be used to determine the arrangement of both primary and secondary windings of three-phase transformers with delta, star, or zigzag windings.
The undertaken research focused on measuring the volumetric flow rate at a hydroelectric power station using a multi-path ultrasonic flow meter. A numerical model of a turbine penstock was built. The model was validated on the basis of the obtained field data for each acoustic beam of the ultrasonic transit time flow meter. We developed and applied a technique which enables one to eliminate additional systematic measurement errors caused by the reformation of the averaged velocity profile in the flow meter section.
A basic methodology for estimating the elastic modulus and Poisson’s ratio of concrete structures operated by GTS in field conditions of instrumental examination using a non-destructive ultrasonic testing method is proposed. These characteristics of the material are in demand during verification calculations. The actual data differ significantly from the design values due to the natural aging of concrete and external influences, accompanied by changes in the properties of the material. There is practically no information in normative and literary sources about practical ways to obtain these important parameters. The article proposes to pay attention to the fundamental possibility of obtaining the required characteristics in the field of instrumental examination of concrete and reinforced concrete structures of GTS.
In the presented description there is a prospect of using a geomat filled with bitumen-polymer binder. The process of development and research of this coating is described. A review of its characteristics with other coatings has been carried out. Options for using this coating in the example of a hydraulic structure are proposed.
The vibration-isolated foundations are currently employed for the installation of gas and steam turbines with heat recovery steam generators, which allows, with appropriate soils, to avoid harmful consequences associated with uneven foundation settlement, while simultaneously protecting the turbo-unit-foundation-base system from increased vibration. However, when using vibration-insulated foundations, there are cases of the cogeneration steam turbine the thrust bearing shoes overheating with an increase in the thermal load of the upper cogeneration steam extraction to the second horizontal network water heater. It takes place when there is no compensation for the thermal expansion of steam extraction pipelines. The article presents the results of a finite element method analysis, which explains the reason for these limitations as uncompensated vertical movement of the steam pipeline of the upper extraction when it is heated by steam directed to second horizontal network water heater. A comparison of the behavior in this situation of foundations on rigid supports and vibration-isolated foundations is given. Recommendations are given to prevent overheating of the thrust bearing shoes of the steam heating turbines installed on vibration-isolated foundations.
If external bearing housings experience hindered thermal displacements during operation, it is commonly recommended to measure the loads on cylinder lugs and apply corrections if necessary. This study analyzes existing recommendations for such measurements and identifies the absence of a standardized measurement procedure. Furthermore, significant factors affecting the reliability of measurements are highlighted. The principles of the measurement procedure that enhance the reliability of results and corresponding recommendations are formulated.
