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Articoli di riviste sul tema "Electric power systems – Mathematical models"

Autore: Grafiati

Pubblicato: 4 giugno 2021

Ultima modifica: 31 gennaio 2023

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1

Ruiz Florez, Hugo A., Gloria P. López, Álvaro Jaramillo-Duque, Jesús M. López-Lezama, and Nicolás Muñoz-Galeano. "A Mathematical Modeling Approach for Power Flow and State Estimation Analysis in Electric Power Systems through AMPL." Electronics 11, no. 21 (November 1, 2022): 3566. http://dx.doi.org/10.3390/electronics11213566.

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This paper presents a mathematical modeling approach by which to solve the power flow and state estimation problems in electric power systems through a mathematical programming language (AMPL). The main purpose of this work is to show the advantages of representing these problems through mathematical optimization models in AMPL, which is a modeling language extensively used in a wide range of research applications. The proposed mathematical optimization models allow for dealing with particular issues in that they are not usually considered in the classical approach for power flow and state est

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2

Vikharev, D. Yu, and N. A. Rodin. "Model of implicit pole electric machine based on mathematical formulation of magnetic field in air gap." Vestnik IGEU, no. 6 (December 28, 2021): 27–37. http://dx.doi.org/10.17588/2072-2672.2021.6.027-037.

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When modeling transient processes in electric power systems, the issue of designing reliable models of electrical machines is of great interest. The most difficult task is to design the models of synchronous and asynchronous machines. The purpose of the project is to develop mathematical models of synchronous and asynchronous machines based on a generalized model of an implicit-pole machine that considers the change of rotor speed, geometric shapes, and the type of rotor and stator windings. Methods of mathematical modeling of electromagnetic fields in the air gap based on Maxwell equations an

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3

Bitimanova, Saltanat Serikbaevna, and Asel Asylbekovna Abdildaeva. "Algorithm for optimal control of electric power systems." Bulletin of Toraighyrov University. Energetics series, no. 4.2020 (December 17, 2020): 78–91. http://dx.doi.org/10.48081/wddo6475.

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This paper provides information about the current state of the energy system in Kazakhstan. Also, analyzing the technical condition of the structure of the Kazakhstan electro power station, a mathematical model for complex power systems is developed. Algorithms of control with Adams-Bashforth multistep method are developed. There has been conducted the analysis and assessment of significant factors affecting the forecasted dynamics of electric power consumption, built based on multivariate regression and cointegration models.

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4

Mehta, U., R. Prasad, and K. Kothari. "VARIOUS ANALYTICAL MODELS FOR SUPERCAPACITORS: A MATHEMATICAL STUDY." Resource-Efficient Technologies, no. 1 (May 9, 2020): 1–15. http://dx.doi.org/10.18799/24056537/2020/1/218.

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Supercapacitors (SCs) are used extensively in high-power potential energy applications like renewable energy systems, electric vehicles, power electronics, and many other industrial applications. This is due to SCs containing high-power density and the ability to respond spontaneously with fast charging and discharging demands. Advancements in material and fabrication techniques have induced a scope for research to improve the application of SCs. Many researchers have studied various SC properties and their effects on energy storage and management performance. In this paper, various fractional

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5

Manusov, Vadim, and Javod Ahyoev. "Technical Diagnostics of Electric Equipment with the Use of Fuzzy Logic Models." Applied Mechanics and Materials 792 (September 2015): 324–29. http://dx.doi.org/10.4028/www.scientific.net/amm.792.324.

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The possible technical diagnostics method of electrical power systems (EPS) has been considered, in particular, the electric equipment of substations and electric networks by means of using mathematical apparatus of indistinct sets and fuzzy logic theory. It is shown that on the basis of indistinct expert estimates it is possible to do a prediction for possible causes of failures if preliminary estimates of the failures signs available are known.

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6

Iakubovsky, Dmitry, Dmitry Krupenev, and Denis Boyarkin. "A minimization model of the power shortage of electric power systems with regard to the restrictions on controlled sections." Analysis and data processing systems, no. 2 (June 18, 2021): 95–120. http://dx.doi.org/10.17212/2782-2001-2021-2-95-120.

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A steady trend towards the development of electric power systems leads to their continuous enlargement and sophistication. As a result, new ways of their control appear. In this regard, the existing models and complexes for adequacy assessment may work inadequately and ineffectively in terms of the obtained results adequacy. To assess the current state of the existing models and complexes, we reviewed and analyzed the domestic and foreign software and computer systems. In particular, we considered mathematical models of minimizing the power shortage. This work is based on the problem of modify

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7

Bebikhov, Yuriy Vladimirovich, Dar'ya Vital'yevna Kazazaeva, Vasiliy Vasil'yevich Fedotov, and Il'ya Anatol'yevich Yakushev. "DESIGN AND DEVELOPMENT OF MATHEMATICAL MODELS OF ELECTRIC POWER SYSTEMS OF INDUSTRIAL ENTERPRISES." Materials. Technologies. Design 4, no. 2 (2022): 5–13. http://dx.doi.org/10.54708/26587572_2022_4285.

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8

Popov, Denis I. "Mathematical modeling of electric power processes in integrated test benches with dc machines operating on the principle of mutual load." Yugra State University Bulletin 18, no. 2 (August 7, 2022): 61–67. http://dx.doi.org/10.18822/byusu20220261-67.

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The subject of the study is electric power processes in integrated test benches with DC machines and induction machines operating on the principle of mutual loading. The purpose of the study is to obtain a mathematical model that allows us to study the operation of DC machines under specified conditions. Methods of mathematical modeling, well-known mathematical models of elements of two-link frequency converters, numerical methods for solving differential equations systems using the Runge-Kutta method of the fourth order of accuracy implemented in the Mathcad computer algebra system are used f

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9

SHEINA, G. "Analysis of mathematical models of transmission lines." Journal of Electrical and power engineering 23, no. 2 (December 23, 2020): 16–19. http://dx.doi.org/10.31474/2074-2630-2020-2-16-19.

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This paper investigates a mathematical model of one elements of the power supply system - power transmission lines. The type of models depends on the initial simplifications, which in turn are determined by the complexity of the physics of processes. The task of improving the accuracy of modeling of emergency processes in the power system is due to the significant complexity of modern power systems and their equipment, high-speed relay protection, automation of emergency management and the introduction of higher-speed switching equipment. One of the reasons for a significant number of serious

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10

Shornikov, Yury, and Evgeny Popov. "Modeling and simulation of transients in electric power systems using hybrid system theory." ITM Web of Conferences 24 (2019): 02012. http://dx.doi.org/10.1051/itmconf/20192402012.

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Transients in electric power systems are of great interest to power engineers when designing a new or maintaining an existing system. The paper deals with using hybrid system theory for modeling and simulation of an electric power system with controllers. The presented technique is rather convenient and recommended as mathematical models of transients in electric power systems with controllers in general contain both continuous and discrete components. The modeling and simulation were carried out in the modeling and simulation environment ISMA, which is briefly presented in the paper.

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11

Reymov, K. M., G. M. Turmanova, S. K. Makhmuthonov, and B. A. Uzakov. "Mathematical models and algorithms of optimal load management of electrical consumers." E3S Web of Conferences 216 (2020): 01166. http://dx.doi.org/10.1051/e3sconf/202021601166.

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The article investigated the static, dynamic and metrological characteristics of new magnetoelastic force sensors taking into account the distribution of Load profile smoothing based on optimal power management is considered to be one of the main ways to ensure efficient operation of energy systems in the short-term planning. Smoothing load profile with a view to reducing costs can be implemented on the ways in which consumers could be affected by administrative and economic measures. Administrative measures are associated with the forced restriction of consumer loads in certain intervals of t

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12

Florez, Hugo A. R., Diogo Marujo, Gloria P. López, Jesús M. López-Lezama, and Nicolás Muñoz-Galeano. "State Estimation in Electric Power Systems Using an Approach Based on a Weighted Least Squares Non-Linear Programming Modeling." Electronics 10, no. 20 (October 19, 2021): 2560. http://dx.doi.org/10.3390/electronics10202560.

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In this work, the state estimation problem of electric power systems is represented through a mathematical programming approach. Initially, a non-linear mathematical model based on the classical method of weighted least squares is proposed to solve the state estimation problem for comparative purposes. Due to the inherent limitations that this classical model presents when dealing with errors in the set of measurements, a new mathematical model is proposed that can be used within an iterative procedure to reduce the impact of measurement errors on the estimated results. Several tests on a dida

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13

Yu Mikaelian, E., and M. A. Trubicin. "The electric substations compensating devices’ distribution optimization." Journal of Physics: Conference Series 2131, no. 4 (December 1, 2021): 042072. http://dx.doi.org/10.1088/1742-6596/2131/4/042072.

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Abstract The article discusses methods for calculating electrical networks when choosing the consumer compensating devices’ location. The main network and calculation module of a complex network is analyzed. The mathematical support of the reactive power factor compensation (PFC) problem is described in regional power systems, the areas of application of individual models are substantiated, and the results of the practical use of the corresponding calculation results are analyzed.

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14

Pulatov, Behzod, and Shanazarov Alisher. "Optimization of modes of the electric power systems by genetic algorithms." E3S Web of Conferences 216 (2020): 01099. http://dx.doi.org/10.1051/e3sconf/202021601099.

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In article discusses issues for solving optimization problems based on the use of genetic algorithms. Nowadays, the genetic algorithms for solving various problems. This includes the shortest path search, approximation, data filtering and others. In particular, data is being examined regarding the use of a genetic algorithm to solve problems of optimizing the modes of electric power systems. Imagine an algorithm for developing the development of mathematical models, which includes developing the structure of the chromosome, creating a started population, creating a directing force for the popu

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15

Prodan, Dan, Anca Bucuresteanu, Adrian Motomancea, and Emilia Balan. "Decrease in Power Consumption of Hydraulic Systems of Modern Machine Tools." Applied Mechanics and Materials 811 (November 2015): 45–49. http://dx.doi.org/10.4028/www.scientific.net/amm.811.45.

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This paper shows several issues related to decrease in electric power consumption for hydraulic systems of modern machine tools, especially CNCs. A core element in the structure of such systems is the pneumo-hydraulic accumulator. Here, examples are shown for hydraulic systems destined to locking and unlocking of skids and to opening of tool holders. This paper shows mathematical models, diagrams, simulations and certain experimental executions.

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16

Na, Liu. "MATHEMATICAL MODELING OF HYBRID VEHICLE’S RECUPERATION BRAKING MODE." Management of Development of Complex Systems, no. 44 (November 30, 2020): 182–87. http://dx.doi.org/10.32347/2412-9933.2020.44.182-187.

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The paper considers the synthesis of mathematical model of recuperation braking mode for hybrid vehicle as a complex control object. The results of computer simulation as diagrams of transients of different operating parameters of hybrid vehicle power system are obtained on the basis of developed model. The analysis of simulation results confirms the adequacy of the mathematic model of the recuperation braking mode of hybrid vehicle to real processes. The developed model can be used for synthesis of automatic control systems of the electric motors, power converters, power supplies and chargers

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17

Iakubovskii, Dmitrii, and Dmitry Krupenev. "Analysis power shortage minimization methods in the modern processing software for adequacy assessment of electric power systems." E3S Web of Conferences 209 (2020): 06008. http://dx.doi.org/10.1051/e3sconf/202020906008.

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Analysis of domestic and foreign software systems for assessing the resource adequacy showed a variety of models and methods used in them. Many software systems use both linear and nonlinear models, these models are optimized according to various criteria to simulate the operation of the system. As tools for solving, software usually use commercial high-level modelling systems for mathematical optimization. However, in addition to the existing ready-made commercial solutions, the authors consider the effectiveness of optimization methods, as well as their parallelized versions, which can be in

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18

Shemelova, O. V., E. V. Yakovleva, T. G. Makuseva, I. I. Eremina, and O. N. Makusev. "Solving optimization problems when designing power supply circuits." E3S Web of Conferences 124 (2019): 04011. http://dx.doi.org/10.1051/e3sconf/201912404011.

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One of the quickly developing trends in the optimization of electric power grids is system development of operation and optimization of branch circuits which are based on linear programming problems. One of its categories is traffic problem. The paper discusses the formulation of various types of transport optimization problems used in the design of the most efficient power supply systems in the real sector of economy. The construction of arithmetic models of problems is carried out. Their optimality criterion is cost minimization for the design of electrical network diagrams consisting of pow

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19

Maximov, Serguei, Manuel A. Corona-Sánchez, Juan C. Olivares-Galvan, Enrique Melgoza-Vazquez, Rafael Escarela-Perez, and Victor M. Jimenez-Mondragon. "Mathematical Calculation of Stray Losses in Transformer Tanks with a Stainless Steel Insert." Mathematics 9, no. 2 (January 18, 2021): 184. http://dx.doi.org/10.3390/math9020184.

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At present it is claimed that all electrical energy systems operate with high values of efficiency and reliability. In electric power systems (EPS), electrical power and distribution transformers are responsible for transferring the electrical energy from power stations up to the load centers. Consequently, it is mandatory to design transformers that possess the highest efficiency and reliability possible. Considerable power losses and hotspots may exist in the bushing region of a transformer, where conductors pass through the tank. Most transformer tanks are made of low-carbon steel, for econ

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20

Rezaeva, M. A., and R. Y. Semendyaev. "Development and Application of Convolutional Neural Network for the Recognition of Objects in the Scheme of Electric Grid." Journal of Physics: Conference Series 2096, no. 1 (November 1, 2021): 012020. http://dx.doi.org/10.1088/1742-6596/2096/1/012020.

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Abstract One of the current design problems in the electric power industry is the labor intensity of synthesizing mathematical models to calculate the electrical modes of the network. It takes a lot of time to compose a detailed model of a large power system based on circuit diagram data. To simplify, speed up, and automate the data input, a convolutional neural network is proposed. In this paper the definition of convolutional neural network is given, its elements are described, the architecture of neural network is developed, the accuracy of its work on the schematic diagrams of various powe

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21

Vivas, Eliana, Héctor Allende-Cid, and Rodrigo Salas. "A Systematic Review of Statistical and Machine Learning Methods for Electrical Power Forecasting with Reported MAPE Score." Entropy 22, no. 12 (December 15, 2020): 1412. http://dx.doi.org/10.3390/e22121412.

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Electric power forecasting plays a substantial role in the administration and balance of current power systems. For this reason, accurate predictions of service demands are needed to develop better programming for the generation and distribution of power and to reduce the risk of vulnerabilities in the integration of an electric power system. For the purposes of the current study, a systematic literature review was applied to identify the type of model that has the highest propensity to show precision in the context of electric power forecasting. The state-of-the-art model in accurate electric

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22

Bulatov, Yuri, Andrey Kryukov, and Aleksandr Cherepanov. "Mathematical models for determining limit operating modes in electrical networks with distributed generation plants." Science Bulletin of the Novosibirsk State Technical University, no. 4 (December 18, 2020): 17–36. http://dx.doi.org/10.17212/1814-1196-2020-4-17-36.

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Decentralization of electricity generation based on distributed generation plants is an important segment of the new technology platform for the power industry. On the basis of this approach, significant positive effects can be obtained, which consist in reducing financial costs of energy supply, increasing the uninterrupted power supply, improving the quality of electricity and stimulating the use of renewable energy sources. Effective use of distributed generation in electric power systems requires the development of methods and tools that provide coordinated management of normal, emergency

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23

Camargo, José Rui, Jamir Machado da Silva, Ederaldo Godoy Junior, Renan Eduardo da Silva, Luiz Eduardo Nicolini do Patrocínio Nunes, and Fabio Silva Rezende. "Direct Thermoelectric Microgeneration Using Residual Heat of Photovoltaic System." Advanced Materials Research 608-609 (December 2012): 97–113. http://dx.doi.org/10.4028/www.scientific.net/amr.608-609.97.

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All photovoltaic panel heats up when exposed to sunlight and this heating reduces the electrical power output of the same. This work presents the use of this unwanted waste heat, converting it into thermal energy directly by means of the Seebeck effect, which is the direct conversion of thermal energy into electrical energy by means of an arrangement of semiconductor materials that when exposed to temperature gradients generate electric current. In this work emphasis was placed on the influence of temperature on generation processes involved. Thus, the theoretical evaluation, it presents the m

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24

Mills, V. D., and J. R. Wagner. "Behavioural modelling and analysis of hybrid vehicle steering systems." Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 217, no. 5 (May 1, 2003): 349–61. http://dx.doi.org/10.1243/095440703321645061.

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Hybrid vehicles integrate an internal combustion engine, electric motor with accompanying battery pack and generator, and potentially fuel cells to realize greater fuel economy and reduced emission levels. A variety of powertrain operating scenarios exist including engine with belt-driven generator, electric motor using battery pack and/or fuel cell and, finally, engine and electric motor. Automotive subsystems such as hydraulic power steering cannot be consistently powered by a conventional belt-driven hydraulic pump since the engine may be frequently turned off to conserve energy. Thus, a ne

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Sidorov, Denis, Fang Liu, and Yonghui Sun. "Machine Learning for Energy Systems." Energies 13, no. 18 (September 10, 2020): 4708. http://dx.doi.org/10.3390/en13184708.

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The objective of this editorial is to overview the content of the special issue “Machine Learning for Energy Systems”. This special issue collects innovative contributions addressing the top challenges in energy systems development, including electric power systems, heating and cooling systems, and gas transportation systems. The special attention is paid to the non-standard mathematical methods integrating data-driven black box dynamical models with classic mathematical and mechanical models. The general motivation of this special issue is driven by the considerable interest in the rethinking

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Krupenev, Dmitry, Denis Boyarkin, and Dmitrii Iakubovskii. "Research of mathematical models for minimizing power shortage with quadratic losses in power lines and with using network coefficients (sensitivity coefficients)." E3S Web of Conferences 216 (2020): 01009. http://dx.doi.org/10.1051/e3sconf/202021601009.

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The article presents an analysis of the models for minimizing the power shortage used in adequacy assessment by the Monte Carlo method. We analysed two models: a model with quadratic losses in power lines and a model using network coefficients (first-order sensitivity coefficients), that are showing the dependence of the change in power flows through power lines on the balance of generation / consumption in the reliability zones. As a result of the analysis, a conclusion is made about the applicability of the investigated models for adequacy assessment in the long-term planning of the developm

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De Pinto, Stefano, and Giacomo Mantriota. "Power Flows in Compound Transmissions for Hybrid Vehicles." Machines 7, no. 1 (March 15, 2019): 19. http://dx.doi.org/10.3390/machines7010019.

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Hybrid electric vehicle (HEV) traction systems are the most promising technologies being characterized by high performance, high fuel efficiency, low emissions and long operating range. Significant improvements can be achieved equipping transmissions with variable transmission ratio such as power-split transmission and a compound power-split electric continuously variable transmission (eCVT). These systems have been introduced to improve vehicle global efficiency since they can maximize the efficiency in different operating conditions. Optimal design and control of these systems leads improvem

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Motovilov, A. I., and I. I. Solovejev. "Online electric network capacity assesment." Power engineering: research, equipment, technology 22, no. 3 (September 8, 2020): 51–59. http://dx.doi.org/10.30724/1998-9903-2020-22-3-51-59.

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Reliability of power supply to consumers and the efficient use of energy resources are priority tasks in the process of operational dispatch control of the energy system. Limitations of the throughput capacity of the electric network increases the value of the non-released power reserve, which in case of violation of the normal mode at one electric power facility can lead to a system accident. The aim of the work is to develop an algorithm for assessing the throughput of the electric network. In this study of the steady-state operating modes of the power system, a method is proposed for online

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Obukhov, S. G., G. N. Klimova, and A. Ibrahim. "Methodology of optimum unit commitment of energy systems with renewable energy sources." Vestnik IGEU, no. 6 (December 28, 2020): 25–38. http://dx.doi.org/10.17588/2072-2672.2020.6.025-038.

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One of the promising ways to improve the reliability and efficiency of power supply for customers in the areas remote from central electrical grid is the use of hybrid power systems with renewable energy sources. The primary task of designing such systems is the unit commitment of the generating equipment that provides the optimal technical and economic indexes of the electric power system. The stochastic nature of generation and nonlinearity of the characteristics of power plants cause a high complexity of solving this problem, which, from a mathematical point of view, is formulated as an opt

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Plakhtyna, O., A. Kutsyk, and A. Lozynskyy. "Method of average voltages in integration step: theory and application." Electrical Engineering 102, no. 4 (June 22, 2020): 2413–22. http://dx.doi.org/10.1007/s00202-020-01039-x.

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Abstract A numerical one-step method of average voltage values in integration step, which allows to algebraize the differential equations for electric circuits of electromechanical systems with semiconductor converters, was described in the paper. The method is proposed for the creation of digital power circuit real-time models of electrical systems in hybrid models that combine digital and physical components. Digital models in hybrid systems must continuously function over a long time period in conjunction with physical objects. The indicated method provides stability of mathematical models,

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Vasiliev, Igor, Boris Kiforenko, and Yaroslav Tkachenko. "COMPARATIVE ANALYSIS OF THE EFFICIENCY OF CONSTANT POWER THROTTLED ROCKET ENGINES FOR INTERORBITAL FLIGHTS TO GEOSTATIONAR." Journal of Automation and Information sciences 6 (November 1, 2021): 66–77. http://dx.doi.org/10.34229/1028-0979-2021-6-7.

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Carrying out low-thrust transfers of spacecrafts in the near-earth space from intermediate elliptic to the geostationary orbit using electric rocket engines seems to be one of the most important tasks of modern cosmonautics. Electric rocket engines, whose specific impulse of the reactive jet is an order of magnitude more than in chemical RD, are preferable for interorbit flights with a maximum payload in the case when a significant increase in the duration of the maneuver is permissible. Ability to throttling the rocket engine thrust is traditionally considered as one of the ways to reduce bot

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Nigim, K. A., M. M. A. Salama, and M. Kazerani. "Solving Polynomial Algebraic Equations of the Stand Alone Induction Generator." International Journal of Electrical Engineering & Education 40, no. 1 (January 2003): 45–54. http://dx.doi.org/10.7227/ijeee.40.1.5.

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This paper describes the use of MathCAD's solving block which uses ‘Given’ and ‘Find’ built-in functions to solve nth order nonlinear algebraic equations. Introducing complex energy systems to electrical engineering students in their undergraduate studies is essential to complement many energy conversion courses. Various electric energy-capturing schemes use electric equivalent circuit models that incorporate nonlinear elements with complex mathematical formulas requiring numerical computation. Without incorporating programming tools, the taught material could be vague and a burden for both th

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Iakubovskii, D. V., D. S. Krupenev, and D. A. Boyarkin. "Application the differential evolution for solving the problem of minimizing the power shortage of electric power systems." E3S Web of Conferences 114 (2019): 03002. http://dx.doi.org/10.1051/e3sconf/201911403002.

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Based on the experience of domestic and foreign researchers, it is known that there are various mathematical models, software systems, and optimization methods used to solve the set tasks for assessing the resource adequacy of electric power systems (EPS). However, the continuous development of EPS leads to the complication and integration of systems against the background of which it becomes necessary to take into account an increasing number of its elements and parameters in one task. Thus, for more effective (in terms of speed and accuracy) solutions of modified models, it is required to an

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Seheda, M. S., P. F. Gogolyuk, and Y. V. Blyznak. "High-frequency periodic processes in two-winding power transformers." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 6 (2021): 96–100. http://dx.doi.org/10.33271/nvngu/2021-6/096.

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Purpose. Mathematical modeling of high-frequency periodic processes in winding power transformers to improve the technology of their design and operation. Methodology. The methods of the formation of mathematical models for the research of high-frequency periodic processes in transformers and methods of solving systems of partial differential equations are applied. Findings. The mathematical model for the research of high-frequency periodic processes in two-winding transformers, with adequate considering of electromagnetic connections of windings and structural parameters of transformers, is c

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Solodyankin, Sergey, and Andrey Pazderin. "Increase of Transient Stability Level of Gas Turbine Power Plant Using FACTS." E3S Web of Conferences 139 (2019): 01049. http://dx.doi.org/10.1051/e3sconf/201913901049.

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The article is devoted to the development of the mathematical models of modern devices of flexible alternating current transmission systems (FACTS) when calculating the modes and stability of power systems and to the analysis of influence of the specified devices on transient stability of the generators. The considered scheme contains the generators with the gas turbine drive that have electromechanical parameters providing lower level of transient stability compared to units of higher power rating, which in some cases requires implementation of measures for transient stability enhancement. As

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Safaryan, V. S. "STUDY OF TRANSIENT AND STATIONARY OPERATION MODES OF SYNCHRONOUS SYSTEM CONSISTING IN TWO MACHINES." ENERGETIKA. Proceedings of CIS higher education institutions and power engineering associations 60, no. 3 (May 17, 2017): 228–36. http://dx.doi.org/10.21122/1029-7448-2017-60-3-228-236.

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The solution of the problem of reliable functioning of an electric power system (EPS) in steady-state and transient regimes, prevention of EPS transition into asynchronous regime, maintenance and restoration of stability of post-emergency processes is based on formation and realization of mathematical models of an EPS processes. During the functioning of electric power system in asynchronous regime, besides the main frequencies, the currents and voltages include harmonic components, the frequencies of which are multiple of the difference of main frequencies. At the two-frequency asynchronous r

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Mishchenko, T. M. "Methodology and Models of Combined Modeling of Electromagnetic Pro-cesses in Electric Traction Systems." Science and Transport Progress. Bulletin of Dnipropetrovsk National University of Railway Transport, no. 2(92) (April 15, 2021): 40–49. http://dx.doi.org/10.15802/stp2021/237404.

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Purpose. The main purpose of the work is the development of identification models and a new method of modeling electromagnetic processes in electric traction systems with simultaneous consideration of all its subsystems, as well as several feeder zones of the electrified section. Methodology. To achieve this purpose, the methods of mathematical modelling, the basics of the theory of random processes and the methodology of their probabilistic-statistical processing, the methods for solving integral equations and analysis of electric traction circuits in electric traction systems are used. Findi

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38

Peng, Huiming, G. Maksim Popov, Feng Li, and Zhiyu Lu. "Dynamic Identification of Equivalent Parameters of Mathematical Models of Power Electrical Equipment of Electromechanical Power Systems." Journal of Physics: Conference Series 2166, no. 1 (January 1, 2022): 012024. http://dx.doi.org/10.1088/1742-6596/2166/1/012024.

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Abstract The article describes a method for dynamic identification of AC and DC hybrid power network parameters. The inaccuracy of the parameters of the electromechanical transient simulation model of the power system has caused the obvious difference between the simulation results and the actual measurement, which has restricted its online application. Over the years, the dynamic parameter identification technology based on field test and test has made great progress, but it is far from satisfactory and accurate. There is still a long research journey for the requirements of performance. The

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39

Shevchenko, S. Yu, D. O. Danylchenko, S. Yu Bilyk, A. E. Potryvai, and G. A. Kovtun. "Considering the effect of dustiness of a photovoltaic module surfaces on solar power generation by matlab software." Electrical Engineering and Power Engineering, no. 4 (December 30, 2021): 28–35. http://dx.doi.org/10.15588/1607-6761-2021-4-5.

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Abstract (sommario):

Purpose. Improving the simulation model of a solar power plant by creating a block model for accounting for dustiness of the surface of photovoltaic modules when calculating the efficiency of electric power generation by a solar power plant.  Methodology. Use of statistical data processing methods and modeling in the structure of Matlab tools. Findings. A mathematical model was created, which made it possible to take into account the influence of dustiness of the surface of photovoltaic modules on the efficiency of electric power generation by a solar power station. The model was t

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40

Chervonchenko, S. S., and V. Ya Frolov. "Research of the operation of an autonomous electrical complex with a combined composition of backup power sources." Power engineering: research, equipment, technology 24, no. 4 (August 17, 2022): 90–104. http://dx.doi.org/10.30724/1998-9903-2022-24-4-90-104.

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THE PURPOSE. To analyze scientific and technical information and practical experience of the functioning of autonomous electrical complexes with asynchronous electric motors in the composition. To develop a mathematical model of an autonomous electrical complex of a drilling rig with the presence of an active rectifier, an inverter with pulse-width control signals, as well as combined backup power sources – a battery and a diesel generator set. To establish the influence and expediency of using a combined composition of backup power sources on reliable operation and the possibility of overcomi

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Gianto, Rudy. "Constant Voltage Model of DFIG-Based Variable Speed Wind Turbine for Load Flow Analysis." Energies 14, no. 24 (December 18, 2021): 8549. http://dx.doi.org/10.3390/en14248549.

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At present, the penetration of wind-driven electric generators or wind power plants (WPPs) in electric power systems is getting more and more extensive. To evaluate the steady state performances of such power systems, developing a valid WPP model is therefore necessary. This paper proposes a new method in modeling the most popular type of WPP, i.e., DFIG (doubly fed induction generator)-based WPP, to be used in power system steady state load flow analysis. The proposed model is simple and derived based on the formulas that calculate turbine mechanical power and DFIG power. The main contributio

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42

LI, SHAO-HUA, and HSIAO-DONG CHIANG. "STRUCTURE-INDUCED BIFURCATION IN LARGE-SCALE ELECTRIC POWER SYSTEMS." International Journal of Bifurcation and Chaos 18, no. 05 (May 2008): 1415–24. http://dx.doi.org/10.1142/s0218127408021075.

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Abstract (sommario):

A structure-induced bifurcation of nonsmooth nonlinear systems is studied and illustrated on electric power system models. The consequence of structure-induced bifurcation is an immediate instability induced by generator reactive power limits. It is numerically shown that structure-induced bifurcation can occur at both small power systems and large-scale power systems. Without taking the structure-induced bifurcation into account in defining power system operating limits, the resulting operating limits can be overly optimistic.

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43

Ho, Kun-Che, Yi-Hua Liu, Song-Pei Ye, Guan-Jhu Chen, and Yu-Shan Cheng. "Mathematical Modeling and Performance Evaluation of Switched-Capacitor-Based Battery Equalization Systems." Electronics 10, no. 21 (October 27, 2021): 2629. http://dx.doi.org/10.3390/electronics10212629.

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Abstract (sommario):

The battery storage system (BSS) is one of the key components in many modern power applications, such as in renewable energy systems and electric vehicles. However, charge imbalance among batteries is very common in BSSs, which may impair the power efficiency, reliability, and safety. Hence, various battery equalization methods have been proposed in the literature. Among these techniques, switched-capacitor (SC)-based battery equalizers (BEs) have attracted much attention due to their low cost, small size, and controllability. In this paper, seven types of SC-based BEs are studied, including c

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44

Wang, Hong, and Feng Chun Sun. "Dynamic Modeling and Simulation on a Hybrid Power System for Dual-Motor-Drive Electric Tracked Bulldozer." Applied Mechanics and Materials 494-495 (February 2014): 229–33. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.229.

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Abstract (sommario):

Hybrid power systems provide high-performances and high-efficiency power for electric bulldozer. This paper firstly constructs the mathematical model of driving motors system based on the design of dual-motor-driving propulsion system for bulldozer. Secondly, by using the setting values from a bulldozer, simulation work is implemented, and parameters of the hybrid power system are matched, and finally, based on MATLAB/Simulink ,dynamic models for the dual-motor-driving hybrid power system is established, and the simulation results are discussed. Simulation results demonstrate the validity of t

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Pulatov, B. "OPTIMIZATION OF MODES OF ELECTR POWER SYSTEMS BY GENETIC ALGOROTHMS." Technical science and innovation 2019, no. 3 (September 18, 2019): 224–29. http://dx.doi.org/10.51346/tstu-01.19.3.-77-0030.

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In article discusses issues for solving optimization problems based on the use of genetic algorithms. To date, the genetic use algorithm for solving various problems. Which includes the shortest path search, approximation, data filtering and others. In particular, data is being examined regarding the use of a genetic algorithm to solve problems of optimizing the modes of electric power systems. Imagine an algorithm for developing the development of mathematical models, which includes developing the structure of the chromosome, creating a started population, creating a directing force for the p

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46

Zhou, Xiaohang, Jian Liu, Mozhi Ding, Huating Zhu, Mingqi Xu, and Qinmiao Li. "Combined optimization of electric heater-heat tank aggregation for wind curtailment." Journal of Physics: Conference Series 2351, no. 1 (October 1, 2022): 012008. http://dx.doi.org/10.1088/1742-6596/2351/1/012008.

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Abstract (sommario):

As the penetration of renewable generation such as wind and solar continues to grow in power systems, system operation calls for curtailment of excess amount of renewable generation. In this regard, an integrated energy system (IES) can be utilized to optimize curtailment. This paper proposes the Electric Heater-Heat Tank Aggregation (EHHTA) as an IES, also an energy coupling device that combines electricity power with heat energy, to deal with redundant wind power curtailment. A combined optimization model was developed in this paper, which incorporates mathematical models of the energy resou

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47

Batsala, Ya V., I. V. Hlad, I. I. Yaremak, and O. I. Kiianiuk. "Mathematical model for forecasting the process of electric power generation by photoelectric stations." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 1 (2021): 111–16. http://dx.doi.org/10.33271/nvngu/2021-1/111.

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Abstract (sommario):

Purpose. Improving the efficiency of photovoltaic power plants in power systems by creating a model for forecasting the amount of electricity produced in the form of a harmonic function and determining the prospects for using the selected mathematical software to develop software applications. Methodology. To determine the amount of electricity generated by photovoltaic plants per day and year, statistical methods are applied using the harmonic function which allows taking into account the main meteorological factors of power change of photomodules. A technique is proposed for taking into acco

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48

Baran, P., Y. Varetsky, V. Kidyba, and Y. Pryshliak. "A mathematical model for the virtual simulator of the power unit electrical part." IOP Conference Series: Materials Science and Engineering 1216, no. 1 (January 1, 2022): 012009. http://dx.doi.org/10.1088/1757-899x/1216/1/012009.

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Abstract (sommario):

Abstract The mathematical model is developed for a virtual training system (simulator) of the power unit electrical part operators of a thermal (nuclear) power plant. The model is used to simulating the main operating conditions of the power unit electrical part: generator idling, generator synchronization with the power system, excitation shifting from the main unit to the backup one and vice versa, switching in the power unit auxiliary system, and others. Furthermore, it has been implemented modelling some probable emergency conditions within a power plant: incomplete phase switching, damage

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49

Plakhtyna, Omelyan, Andriy Kutsyk, and Mykola Semeniuk. "Real-Time Models of Electromechanical Power Systems, Based on the Method of Average Voltages in Integration Step and Their Computer Application." Energies 13, no. 9 (May 4, 2020): 2263. http://dx.doi.org/10.3390/en13092263.

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Abstract (sommario):

In this work, the real-time mathematical models of electromechanical power systems with semiconductor converters based on the author’s method of the average voltages in the integration step are described. As well as the theoretical basics of the method, the algebraization algorithm of differential equations on a time quantum is described. This time quantum in the hybrid model is synchronized with the time quanta of signal samples of the physical part of the model. In the hybrid model, only algebraic equations of electromechanical power systems are present. Software and technical applications o

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50

Vereshchago, Yevhen, and Vitalii Kostiuchenko. "Modeling of welding arc power supply diagrams in Matlab / Simulink." Electrical Engineering and Power Engineering, no. 3 (September 30, 2021): 8–20. http://dx.doi.org/10.15588/1607-6761-2021-3-1.

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Abstract (sommario):

Purpose. Creation of virtual blocks and simulation laboratory stands for the study and comprehensive research of the dynamic properties of welding power supplies. Methodology. Review of literary sources on the subject, simulation modeling of electromagnetic processes in the MATLAB software environment, comparative analysis of obtained and available data. Findings. The comparative analysis of means of modeling of power sources of a welding arc is executed. One of the main parameters by which the environments were compared is functionality. Among the considered simulators, Simulink of the MATLAB

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