Articoli di riviste: "Electric power transmission"

1

Voronin, V. A., N. S. Gritsenko, S. N. Makarovskii e V. N. Pod’yachev. "Controllable Electric Power Transmission". Power Technology and Engineering 49, n. 3 (settembre 2015): 229–32. http://dx.doi.org/10.1007/s10749-015-0605-3.

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Campbell, L. C. "Electric Power Transmission System Engineering". Power Engineering Journal 3, n. 2 (1989): 92. http://dx.doi.org/10.1049/pe:19890015.

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Schleiffer, Jean-Eric, Wilco van Harselaar, Ye Shen e Stephan Rinderknecht. "Simulative Assessment of Novel Parallel-Hybrid-Electric Powertrains: Consideration of Transmission System Power Losses". Vehicles 2, n. 1 (3 marzo 2020): 173–90. http://dx.doi.org/10.3390/vehicles2010010.

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Transmission system power losses influence the efficiency of hybrid powertrains. Well-established parallel-hybrid-electric powertrains employ conventional transmissions that can be treated as single-input-single-output (SISO) systems. Novel parallel-hybrid-electric powertrains, which are not based on conventional transmissions, can increase the systems potential but increase the complexity as the transmission becomes a multiple-input-multiple-output (MIMO) system. For these MIMO-transmission systems, the losses can strongly depend on the selected transmission mode and on the input torques of the power sources. This paper presents a method to automatically model the power losses of such MIMO-transmission systems. This method consists of a mathematical analysis and a design analysis, and obtains the transmission power losses as a function of the selected transmission mode, the rotational speed of the wheels, and the torques of the power sources. The model includes gear meshing losses, gear churning losses, and bearing losses. Furthermore, an extended control strategy is proposed to ensure local optimality including the consideration of the multidimensional transmission power loss characteristics. A case study is presented to demonstrate the developed methods, and shows that the inclusion of the transmission losses in the powertrain model and control strategy can be considered relevant for the simulative assessment of novel parallel-hybrid-electric powertrains.

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Basov, H. H., e M. I. Falaleiev. "IMPROVING THE EFFICIENCY OF POWER TRANSMISSION USING A RECTIFIER CONVERTERS WITH VARIABLE STRUCTURE POWER CIRCUIT". Science and Transport Progress, n. 14 (25 febbraio 2007): 28–29. http://dx.doi.org/10.15802/stp2007/17816.

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Different ways of increasing efficiency of electric transmission in the rolling stock and methods of improving the power efficiency in the use of valve transformers with the variable structure of power circuit are examined in the article. The methods of designing electric transmissions with variable structure of power circuits have been offered.

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Krokhin, Oleg N. "Electric power transmission using laser radiation". Uspekhi Fizicheskih Nauk 176, n. 4 (2006): 441. http://dx.doi.org/10.3367/ufnr.0176.200604i.0441.

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6

Silva, Washington Martins, e Osvaldo Candido. "Assessing Brazilian electric power transmission auctions". Journal of Economic Studies 47, n. 1 (28 febbraio 2020): 182–99. http://dx.doi.org/10.1108/jes-06-2018-0212.

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PurposeThis paper aims to assess all the Brazilian electric power transmission line auctions occurred between 1999 and 2017.Design/methodology/approachA copula-based Roy/endogenous switching regression model is used. The suitability of this model is twofold: it takes into account the selection bias problem involving auctions data and it allows more flexibility in modeling the joint distribution between the unobserved components of the selection and outcome equations; thus, normal distribution assumptions are not needed.FindingsThe main results suggest that stated-owned companies have the highest probability of winning an auction, and there is a non-competitive behavior among the players in the auction. The results also suggest some departure from joint normality in the data.Originality/valueThe copula-based sample selection approach used in this paper is consistent under non-normality and allows one to address different types of nonlinearities in the data such as asymmetry and heavy tails.

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Petina, David A., Michael Murphy e Andrew C. Gross. "Electric Power Transmission and Distribution Equipment". Business Economics 46, n. 4 (ottobre 2011): 249–59. http://dx.doi.org/10.1057/be.2011.22.

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8

Hogan, William W. "Contract networks for electric power transmission". Journal of Regulatory Economics 4, n. 3 (settembre 1992): 211–42. http://dx.doi.org/10.1007/bf00133621.

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9

Petrov, O. I. "Electric transmission for hybrid vehicle". IOP Conference Series: Materials Science and Engineering 1220, n. 1 (1 gennaio 2022): 012008. http://dx.doi.org/10.1088/1757-899x/1220/1/012008.

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Abstract A technical solution is proposed for the electrical transmission of the torque of the internal combustion engine to the wheels (propeller) of a hybrid vehicle to set it in motion. The purpose of the technical solution is to reduce energy losses in the electrical power transmission device and reduce the cost of its implementation. The expected economic effect in the implementation of the proposed technical solution consists of a reduction in power losses during electric power transmission up to 10% of the engine power, and the cost of its implementation will reduce the cost of the vehicle by up to € 2 000. The proposed device is technically feasible using commercially available devices and can be used in the automotive industry, while being able to recoup the costs of implementation, that is, it meets the criterion “industrially applicable”.

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Zhao, Qiang, Shengming Zhou, Yongheng Yue, Bohang Liu, Qin Xie e Na Zhang. "Assessing the Dynamic Performance and Energy Efficiency of Pure Electric Car with Optimal Gear Shifting". Energies 16, n. 16 (18 agosto 2023): 6044. http://dx.doi.org/10.3390/en16166044.

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Traditional pure electric cars generally adopt single-speed transmission for cost consideration. However, with the renewal and iteration of technology, small electric cars are all developed in the direction of power performance and environmental protection. Gear shifting makes it possible for the motor to work in a more efficient range, which possibly improves the performance of the entire powertrain. In this paper, a small electric car is designed, its power parameters are matched, and the energy-saving space and effect brought by adding multiple-gear shifting transmissions are discussed. To begin, the power-matching design was carried out, and then the transmission ratio was determined by particle swarm optimization. Finally, the power performance and fuel economy of this designed car equipped with different types of transmissions were analyzed and compared through simulation experiments. The results show that the electric car equipped with two-speed transmission has improvements in most important indicators, among which the acceleration time of 0 to 100 km/h is decreased by 17.7%, and the power consumption is reduced by 1.8%. To sum up, the feasibility of applying multiple-gear shifting to small electric cars is verified, and the experimental results provide a valuable reference for the development of electric cars.

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Iswanjono, Y. B. Lukiyanto, Budi Setyahandana e Rines. "A Couple of Generator and Motor as Electric Transmission System of a Driving Shaft to Long Distance Driven Shaft". E3S Web of Conferences 67 (2018): 01013. http://dx.doi.org/10.1051/e3sconf/20186701013.

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Wind energy converter commonly converts wind power to shaft and electric power. One of the problems of transmitting shaft power is the limited distance between the driving to the driven shaft. This paper describes an experimental study of electrical transmission from driving to the driven shaft that was carried out on three modes of cable lines transmission. The driving shaft was attached to an electric generator that converts shaft r to electric power. The driven shaft was coupled by electric motor which reconverts the electric to shaft power. The generator and motor were BLDC and BDC permanent magnet electric machines. The distance of the driving to the driven shaft was 300 meters. The electric power was transmitted using wires. The wires consisted of 2 and 3 cables commonly used by peoples and sold in market place. The results showed that electric transmission mode on the experiment has important role on performance of shaft power to electric power conversion on driving generator and energy losses on cables transmission. DC on small wires electric transmission gave total efficiency of 16.2 %. DC on large wires electric transmission gave total efficiency of 32.9 %. AC on large wires electric transmission gave total efficiency of 36.4 %.

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Vu, Trieu Minh, Reza Moezzi, Jindrich Cyrus, Jaroslav Hlava e Michal Petru. "Automatic Clutch Engagement Control for Parallel Hybrid Electric Vehicle". Energies 14, n. 21 (3 novembre 2021): 7256. http://dx.doi.org/10.3390/en14217256.

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Automatic clutch engagement control is essential for all kinds of vehicle power transmissions. The controllers for vehicle power transmissions may include model-based or model-free approaches and must provide high transmission efficiency, fast engagement and low jerk. Most vehicle automatic transmissions are using torque converters with transmission efficiencies up to 96%. This paper presents the use of fuzzy logic control for a dry clutch in parallel hybrid electric vehicles. This controller can minimize the loss of power transmission since it can offer a higher transmission efficiency, up to 99%, with faster engagement, lower jerk and, thus, higher driving comfortability with lower cost. Fuzzy logic control is one of the model-free schemes. It can be combined with AI algorithms, neuro networks and virtual reality technologies in future development. Fuzzy logic control can avoid the complex modelling while maintaining the system’s high stability amid uncertainties and imprecise information. Experiments show that fuzzy logic can reduce the clutch slip and vibration. The new system provides 2% faster engagement speed than the torque converter and eliminates 70% of noise and vibration less than the manual transmission clutch.

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Shen, Ye, Andreas Viehmann e Stephan Rinderknecht. "Investigation of the power losses of the hybrid transmission DE-REX based on modeling and measurement". Proceedings of the Institution of Mechanical Engineers, Part D: Journal of Automobile Engineering 233, n. 14 (18 febbraio 2019): 3646–57. http://dx.doi.org/10.1177/0954407019829655.

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Electric and hybrid powertrains are developed to reduce the energy and fuel consumption of vehicles. Recently, multi-speed transmission systems were discussed for further reduction of the energy consumption of electric vehicles. Therefore, analyzing the power losses of such transmissions is of interest. In this paper, the novel powertrain concept DE-REX (Two-Drive-Transmission with Range-Extender) and the experimental investigation of its overall power losses is first introduced. A method is then developed to model and analyze the power losses of this hybrid transmission based on experimental data. After the validation of the method, the overall power loss model is eventually applied to estimate the power losses of the transmission at other driving modes, which were not measured on the test rig. The method is used to understand the characteristics of power losses inside the transmission in a hybrid powertrain and to optimize powertrain power losses in future.

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14

Joskow, Paul L., e Jean Tirole. "Transmission Rights and Market Power on Electric Power Networks". RAND Journal of Economics 31, n. 3 (2000): 450. http://dx.doi.org/10.2307/2600996.

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Nozari, F., e H. S. Patel. "Power electronics in electric utilities: HVDC power transmission systems". Proceedings of the IEEE 76, n. 4 (aprile 1988): 495–506. http://dx.doi.org/10.1109/5.4434.

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De Pinto, Stefano, e Giacomo Mantriota. "Power Flows in Compound Transmissions for Hybrid Vehicles". Machines 7, n. 1 (15 marzo 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 improvements in vehicles performance and mathematical models, which support the preliminary design phase, can play a key role in this field. In this work, the internal power circulations of “four-port-mechanical-power split device are determined through a dynamic analysis.” Finally, the efficiency of the compound transmission is analytically evaluated, assuming that the overall losses are linked to the eCVT variator.

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Ethmane, I. A., M. Maaroufi, A. K. Mahmoud e A. Yahfdhou. "Optimization for Electric Power Load Forecast". International Journal of Electrical and Computer Engineering (IJECE) 8, n. 5 (1 ottobre 2018): 3453. http://dx.doi.org/10.11591/ijece.v8i5.pp3453-3462.

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Load flow studies are one of the most important aspects of power system planning and operation. The main information obtained from this study comprises the magnitudes and phase angles of load bus voltages, reactive powers at generators buses, real and reactive power flow on transmission lines, other variables being known. To solve the problem of load flow, we use the iterative method, of Newton-Raphson. Analysis of the found results using numerical method programmed on the Matlab software and PSS/E Simulator lead us to seek means of controlling the reactive powers and the bus voltages of the Nouakchott power grid in 2030 year. In our case, we projected the demand forecast at 2015 to 2030 years. To solve the growing demand we injected the power plants in the system firstly and secondly when the production and energy demand are difficult to match due to lack of energy infrastructures in 2030.It is proposed to install a FACTS (Flexible Alternative Current Transmission Systems) system at these buses to compensate or provide reactive power in order to maintain a better voltage profile and transmit more power to customers.

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Chountasis, Spiros. "Communication Challenges for Electric Power Transmission Systems". International Journal of Engineering and Technologies 21 (25 ottobre 2021): 1–15. http://dx.doi.org/10.18052/www.scipress.com/ijet.21.1.

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Uninterrupted electric power supply and transmission is a part of critical infrastructure for any nation’s security, economy and healthcare systems. Essential requirements for operating and managing an industrial control system is the secure and instant data transfer between control centers and generation stations or substations. This paper review the general Energy Management System architecture implemented for the Hellenic Power Transmission System. It gives a possible direction to best suited SCADA system network communication by emphasizing on the security. A brief study of the communication protocols is also presented. This work focuses on the key role of telecommunication provision for critical distributed control infrastructures. Based on the relative analysis presented in this paper directions towards a secure critical infrastructures network communications are provided. Subject Classification Numbers: 68M01, 68M10, 94A05.

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19

Prosser, J., J. Selinsky, H. Kwatny e M. Kam. "Supervisory control of electric power transmission networks". IEEE Transactions on Power Systems 10, n. 2 (maggio 1995): 1104–10. http://dx.doi.org/10.1109/59.387957.

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20

Furby, Lita, Paul Slovic, Baruch Fischhoff e Robin Gregory. "Public perceptions of electric power transmission lines". Journal of Environmental Psychology 8, n. 1 (marzo 1988): 19–43. http://dx.doi.org/10.1016/s0272-4944(88)80021-5.

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Sozer, Sevin, Chan S. Park e Jorge Valenzuela. "Economic Analysis of Electric Power Transmission Expansion". Engineering Economist 53, n. 4 (4 dicembre 2008): 293–317. http://dx.doi.org/10.1080/00137910802482261.

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Chountasis, Spiros. "Communication Challenges for Electric Power Transmission Systems". International Journal of Engineering and Technologies 21 (25 ottobre 2021): 1–15. http://dx.doi.org/10.56431/p-5ayzg2.

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Uninterrupted electric power supply and transmission is a part of critical infrastructure for any nation’s security, economy and healthcare systems. Essential requirements for operating and managing an industrial control system is the secure and instant data transfer between control centers and generation stations or substations. This paper review the general Energy Management System architecture implemented for the Hellenic Power Transmission System. It gives a possible direction to best suited SCADA system network communication by emphasizing on the security. A brief study of the communication protocols is also presented. This work focuses on the key role of telecommunication provision for critical distributed control infrastructures. Based on the relative analysis presented in this paper directions towards a secure critical infrastructures network communications are provided. Subject Classification Numbers: 68M01, 68M10, 94A05.

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23

Chao, Hung-Po, e Stephen Peck. "A market mechanism for electric power transmission". Journal of Regulatory Economics 10, n. 1 (luglio 1996): 25–59. http://dx.doi.org/10.1007/bf00133357.

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Suzuki, Yuya, e Kenji Shiba. "512 Wireless Electric Power Transmission for Notebook Computer : Analysis of Efficiency of Electric Power Transmission and Biological Effect". Proceedings of Ibaraki District Conference 2011.19 (2011): 137–38. http://dx.doi.org/10.1299/jsmeibaraki.2011.19.137.

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ZAGINAILOV, VLADIMIR I. "Identification of quality and energy efficiency of low-voltage power transmission". Agricultural Engineering, n. 1 (2024): 80–88. http://dx.doi.org/10.26897/2687-1149-2024-1-80-88.

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Providing consumers with high quality electric power with minimum transmission losses is one of the problems of electric power transmission through power grids. Increasing reactive power of electric consumers, estimated by the load power factor, results in an increase in electricity losses and quality deterioration. To evaluate the influence of the load power factor on the transmission of active load power and to determine the quality and energy efficiency of electricity transmission through power lines, the authors analyzed the change in the parameters of one phase of a three-phase network without compensation and with reactive power compensation. The set task was solved using methods of calculation of linear electric circuits of alternating current, according to the given values of total or active load power, its resistance and the resistance of power line wires. Then the processes of power transmission in low-voltage electric networks of alternating current were simulated using the Electronics Workbench software. The authors take a case of the electric power system consisting of consumers’ (load) electric receptors receiving power supply through the power line connected to the low-voltage busbars of the power transformer. They prove that its parameters are mainly changed when changing the value of the system current determined by the load and transmission line resistances. The quality of low-voltage electrical energy transmission depends on the voltage loss in the power line wires and is determined by the load current and its full resistance. The energy efficiency of electrical energy transmission depends on the power loss in the power line wires and is determined by the amount of active power consumed by the load and the ratio of the active resistance of the power line and the load.

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Sathe, Minal Dilip, Priyanka Sandesh Nikam e Gajanan Khapre. "Wireless Charging Control for Electric Vehicles". International Journal for Research in Applied Science and Engineering Technology 11, n. 5 (31 maggio 2023): 4317–21. http://dx.doi.org/10.22214/ijraset.2023.52478.

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Abstract: Wireless power transmission is a way to transmit power without a wire. Wireless power transmission helps connect areas where people do not have access to an adequate power source. Anyone can get clean and green wireless power. From now on, all devices will be connected to the power source wirelessly. Wireless charging for electric vehicles has been in development for several years before the widespread use of these vehicles. Today, wireless charging systems offer an efficient and flexible way to charge electric vehicles of several categories and different capacities from a common base source. Standardization work is well underway to ensure system compatibility between vehicles and locations. In this paper, we presented successful experimental experiments for wireless power transmission and the future scope of wireless power transmission in electric vehicles

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Kaganov, W. I., e Bui Huu Chuc. "Wireless power transmission". Russian Technological Journal 8, n. 6 (18 dicembre 2020): 47–53. http://dx.doi.org/10.32362/2500-316x-2020-8-6-47-53.

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Electrical energy from power plants to industrial facilities and settlements is mostly transmitted by wire-connected air or underground lines covering vast territories. However, in some rare cases there is a need for wireless transmission of electrical power to objects located in hard-to-reach areas. The problem of wireless transmission of electrical energy will become especially urgent as space electric power industry based on the placement of solar power plants in outer space is being developed. In this regard, several countries are conducting studies on the problem of electrical energy transmission using both laser and microwave radiation. The fundamentals of building systems for wireless transmission of electrical energy over short distances using microwave radiation are considered. Two options for constructing such systems are analyzed and calculated: using parabolic antennas and using phased array antennas. For both options the main parameters of systems for wireless transmission of electrical energy at 200 m were calculated. In the first case, powerful microwave devices are used: a magnetron or a direct-flight klystron; in the second case, microwave powerful field-effect transistors. For the second option the summation of the powers of microwave generators by means of their mutual synchronization is proposed.

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Geng, Stefan, Andreas Meier e Thomas Schulte. "Model-Based Optimization of a Plug-In Hybrid Electric Powertrain with Multimode Transmission". World Electric Vehicle Journal 9, n. 1 (13 giugno 2018): 12. http://dx.doi.org/10.3390/wevj9010012.

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Plug-in hybrid electric vehicles are developed in order to reduce the fuel consumption and the emission of carbon dioxide. Besides the series, parallel and power split configurations are commonly used for conventional hybrid electric vehicles, and multimode transmissions are used for plug-in hybrid electric vehicles, which are able to switch between different modes like parallel or series operation of the combustion engine and electric motor. Several concepts have already been discussed and presented. These concepts comprise novel structures and multi-speed operation for the combustion engine and the electric motor, respectively. For improving the fuel and energy consumption, model-based optimizations of multimode transmissions are performed. In the first step of the optimization, the optimal number of gears and transmission ratios, as well as the corresponding fuel and energy savings, are estimated. Based on these results, a new multimode transmission concept with two-speed transmissions for the combustion engine and the electric motor has been developed. The knowledge of the concrete concept enables the further optimizations of the transmission ratios and the transmission control. In order to prove the benefit of the new and optimized transmission concept, powertrain simulations have been carried out. The new powertrain concept is compared to a powertrain concept with single-speed transmissions for the internal combustion engine (ICE) and electric motor operation. The new transmission concept enables a significant improvement of the fuel consumption.

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Zhang, Sheng-Peng, e Tae-Oh Tak. "Efficiency Evaluation of Electric Bicycle Power Transmission Systems". Sustainability 13, n. 19 (3 ottobre 2021): 10988. http://dx.doi.org/10.3390/su131910988.

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In this study, a method for estimating the efficiency of electric bicycle power train systems consisting of typical components, such as an electric motor, gears, sprockets, and chains is presented. In order to calculate the efficiency of a power train system, the relationship between the drive motor torque and the road-load that is exerted on the rear wheel was derived, considering kinematic inertia effects and friction losses between power transmission elements. Among the factors that influence efficiency, it was found that friction losses play a dominant role, while the effects of inertia are insignificant. The factors that influence the efficiency of electric bicycles due to friction losses, such as the transmission efficiency of the chain system and the bearing in the sprocket and wheel, were quantified. To validate the proposed efficiency calculation procedure, an experimental electric bicycle was used, in which the driving torque and road-load could be quantitatively assessed, and the actual efficiency was measured on a chassis dynamometer. It is shown that for a given motor torque, a measured and estimated dynamometer torque obtained by the proposed method exhibits a good correlation, and the transmission efficiency of each component was quantified. This method provides a practical and accurate means to calculate the drive train efficiency of electric bicycles at the design stage to improve the efficiency of electric bicycles.

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Karasoy, Sertaç, Mustafa Burak Can, Fatma Öz e Ferhan Fıçıcı. "Electric Motor Selection Criteria for Traction System in Construction Machines". Orclever Proceedings of Research and Development 4, n. 1 (31 maggio 2024): 123–46. http://dx.doi.org/10.56038/oprd.v4i1.471.

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Recent developments in electric motors in construction machinery and the automotive sector's trend towards electric traction in recent years are among the factors triggering and influencing the shift towards electric traction in construction machinery. There is no doubt that electric construction machinery will be the first choice for urban operations in the future, but many research and development efforts are still ongoing to dominate the market. Electric motors are the most important components of power transmission systems in electric machines. The trend towards increasing power density and efficiency in power transmission systems contributes to different designs and improvements in basic electric motor topologies. This article provides an insight into the selection of electric motors to be used in power transmission components of electric construction machinery and allows for the comparison of different electric motors.

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Xia, Fei, Zong Ze Xia e Xiao Bo Huang. "Research on Electric Power Communication Optical Fiber Transmission Network Evaluation and Optimization Method". Advanced Materials Research 1044-1045 (ottobre 2014): 1459–62. http://dx.doi.org/10.4028/www.scientific.net/amr.1044-1045.1459.

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With the improvement of power industry modernization, electric power communication service object is no longer confined to the electric power dispatching, and the scope of services business also won the development, which requires the power system communication network is stable, reliable and efficient. The reliability of the power system optical fiber transmission network operation is an important guarantee of electric power system`s production safety and efficiency. In order to facilitate the planning and design of optical fiber transmission network management and maintenance, this paper proposed an optimization strategy based on the analysis and research of electric power communication optical fiber transmission network evaluation methods.

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Li, Wenjin, Bingkang Li, Rengcun Fang, Peipei You, Yuxin Zou, Zhao Xu e Sen Guo. "Risk Evaluation of Electric Power Grid Enterprise Related to Electricity Transmission and Distribution Tariff Regulation Employing a Hybrid MCDM Model". Mathematics 9, n. 9 (28 aprile 2021): 989. http://dx.doi.org/10.3390/math9090989.

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In China, a new-round marketization reform of electricity industry is in progress, and the electricity transmission and distribution tariff reform is the core and important task. Currently, the electricity transmission and distribution tariff regulation has gone to the second round in China, and the electric power grid enterprises are facing a closed-loop regulatory system and an increasingly strict regulatory environment. Therefore, it is urgent to evaluate the risk of electric power grid enterprise that is related to electricity transmission and distribution tariff regulation, which can aid the electricity regulators and electric power grid enterprise operators to manage risk and promote the sustainable development of electric power industry. In this paper, a hybrid novel multi-criteria decision making (MCDM) method combining the fuzzy Best-Worst method (FBWM) and improved fuzzy comprehensive evaluation method based on a vague set is proposed for the risk evaluation of electric power grid enterprise related to electricity transmission and distribution tariff regulation. The risk evaluation index system is built. Subsequently, the FBWM is utilized to determine the optimal weights of electric power grid enterprise risk criteria, and the improved fuzzy comprehensive evaluation method that is based on vague set is employed to rank the comprehensive risk grade of electric power grid enterprise related to electricity transmission and distribution tariff regulation. The risk of a province-level electric power grid enterprise that is located in Northern China is empirically evaluated using the proposed MCDM method, and the result indicates that the overall risk of this province-level electric power grid enterprise belongs to ‘High’ grade, but it is very close to ‘Very High’ grade. The results indicate that the proposed hybrid novel MCDM method in this paper is effective and practical. Meanwhile, it provides a new view for the risk evaluation of electric power grid enterprise that is related to electricity transmission and distribution tariff regulation.

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Mohd Alias, Mohammad Zakaria, Mariyam Jamilah Homam e Faridah Hanim Mohd Noh. "Review on solar disturbance studies and electric power transmission line fault in Malaysia". Indonesian Journal of Electrical Engineering and Computer Science 17, n. 1 (1 gennaio 2020): 118. http://dx.doi.org/10.11591/ijeecs.v17.i1.pp118-125.

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<span lang="EN-GB">This work is a review on previous research and studies on the solar disturbance activities and faults that occur on the electric power transmission line. Research has shown that low latitude regions could also be affected by solar disturbance events. The effects of these events on earth are considerable and may cause electric power transmission failure. Geomagnetically induced current is one of the ground impacts to the transmission line, which may cause fault or disturbance and consequently power system failure. Solar disturbance data from magnetometers and electric power transmission line fault data from a digital fault recorder are reviewed in this work. These data would be valuable in determining the characteristics and effects of solar disturbances on Malaysia’s electric power transmission lines.</span>

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Kitajima, Takashi. "The Bulk Power Transmission System of Tokyo Electric Power Company". IEEJ Transactions on Fundamentals and Materials 128, n. 3 (2008): 153–57. http://dx.doi.org/10.1541/ieejfms.128.153.

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Lindsay, N. Mahiban, e A. K. Parvathy. "Power System Reliability Assessment in a Complex Restructured Power System". International Journal of Electrical and Computer Engineering (IJECE) 9, n. 4 (1 agosto 2019): 2296. http://dx.doi.org/10.11591/ijece.v9i4.pp2296-2302.

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The basic purpose of an electric power system is to supply its consumers with electric energy as parsimoniously as possible and with a sensible degree of continuity and quality. It is expected that the solicitation of power system reliability assessment in bulk power systems will continue to increase in the future especially in the newly deregulated power diligence. This paper presents the research conducted on the three areas of incorporating multi-state generating unit models, evaluating system performance indices and identifying transmission paucities in complex system adequacy assessment. The incentives for electricity market participants to endow in new generation and transmission facilities are highly influenced by the market risk in a complex restructured environment. This paper also presents a procedure to identify transmission deficiencies and remedial modification in the composite generation and transmission system and focused on the application of probabilistic techniques in composite system adequacy assessment

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Cheremisin, Vasily, e Evgeny Tretyakov. "Implementation of the method of adaptive management of electric power transmission in distribution electric networks of railways". MATEC Web of Conferences 239 (2018): 01011. http://dx.doi.org/10.1051/matecconf/201823901011.

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The separation of the electric grid cluster rendering services related to transmission of electric power through electric grids from the railways electric power supply system within the Russian Railways holding will make it possible to proceed with to the modernization of the distribution electric networks of the railways at the expense of the investment component of the tariff. The innovative development of the grid company of the Russian Railways holding company is to be synchronized with its technological indicators with PJSC FGC UES and PJSC Rosseti and is aimed at creating a stable, efficient, flexible and intelligent electric power infrastructure. The aim of the present research is to increase the efficiency of electric power transmission in the distribution electric networks of railways due to the adaptive control of the regulators of the operation mode parameters. The implementation of the method of adaptive control of electric power transmission in distribution electric networks of railways based on the agent approach is presented.

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37

Dolega, Waldemar. "Development of electric power network infrastructure in aspect of electric energy supply security – case study Poland". E3S Web of Conferences 84 (2019): 02002. http://dx.doi.org/10.1051/e3sconf/20198402002.

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In this paper, an analysis of issues related to development of national electric power network infrastructure in aspect of electric energy security is performed. Profile of network infrastructure in area of transmission and distribution is performed. Threats for electric energy supply security connected with transmission and distribution infrastructure are discussed. Both transmission and distribution electric power network are adapted for presently occurred typical conditions of electric energy demand and realization of internal tasks in normal conditions, but can create potential threat for electric energy supply security. In the context of forecasted increase of electric energy demand, inadequate power in National Electric Power System (NEPS) in domestic sources and available through intersystem connections, uneven location of sources and consumers at shortage of proper network transmission capacities, necessity of improvement of quality and electric energy supply reliability to final consumers and intensive development of renewable energy sources, present network infrastructure in area of transmission and distribution will be insufficient. Development of 400 and 220 kV transmission network, 110 kV distribution network especially in area of cities, MV distribution network especially in rural areas and realization of investments for improvement of export-import possibilities of NEPS will be necessary. Challenges for transmission and distribution system operators in area of network development are performed. They concern mainly investment sphere and area connected with preparation and construction of network investments.

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38

Golov, V. P., D. N. Kormilitsyn e O. S. Sukhanova. "Analysis of influence of controlled high voltage line and automatic excitation control generators on oscillatory steady-state stability of electric-power system". Vestnik IGEU, n. 1 (28 febbraio 2022): 38–45. http://dx.doi.org/10.17588/2072-2672.2022.1.038-045.

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Abstract (sommario):

According to the rules of installation of electricity-generating equipment, synchronous machines (generators, compensators, electric motors) must be equipped with automatic excitation control devices. Their application has a positive effect on the stability indicators and electrical power-engineering system modes. Currently, the development of industry and an increase in the number of consumers require transmission capacity growth of existing 220 kV power transmission lines. The use of controlled series compensation devices can significantly increase the transmission capacity of a power transmission line, however, there is a problem of stable operation of the electric power-engineering system. To choose the methods for control parameters of automatic excitation control and controlled series compensation device, it is advisable to analyze the oscillatory steady-state stability of the electric power-engineering system that contain a controlled 220 kV power transmission line when regulating the excitation of its generators. Methods of mathematical modeling of the electric power system, the theory of long-distance power lines and electromechanical transients, methods of analyzing the stability of electric power systems are used. The original software in the C++ programming language has been used as a modeling tool. The authors have analyzed the influence of controlled series compensation of high voltage transmission line and generators of automatic excitation control on oscillatory steady-state stability of electric power system. The parameters value of regulation of the controlled series compensation device and the automatic excitation control are determined, considering restrictions while maintaining the positive influence of these devices. Zones of stability of the examined electric power-engineering system are formed depending on setup variable of the devices under consideration. The obtained results can be used to enhance oscillatory steady-state stability of electric power system with controlled series compensation device and automatic excitation control systems.

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39

Golov, V. P., A. V. Kalutskov, D. N. Kormilitsyn e O. S. Sukhanova. "Aperiodic steady-state stability criterion of electric power system with controlled series compensation on 200 kV line". Vestnik IGEU, n. 6 (28 dicembre 2020): 14–24. http://dx.doi.org/10.17588/2072-2672.2020.6.014-024.

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Currently there is a need to synchronize operation of the electric power system in the remote areas and increase of existing lines transmission capacity. The construction of new power transmission lines involves high economic expenditures. Well-known papers consider the issues of application of controlled series compensation devices only for long-distance power transmission lines with voltage of 500 kV and higher to increase the transmission capacity and the level of stability. The aim of the study is to increase the stability and the limit of the transmitted power when controlled series compensation devices are installed on 220 kV lines. It is necessary to develop a criterion of aperiodic steady-state stability of an electric power system with a 220 kV-controlled power transmission line. Methods of mathematical modeling of electric power system, the theory of long-distance power transmission lines and electromechanical transients, and methods of analyzing electric power system stability were used. A.M. Lyapunov’s first approximation method was used to develop a simplified mathematical model. We applied the developed software as a simulation tool. An analysis was carried out to study the influence of series compensation devices regulation coefficients on the aperiodic steady-state stability of the electric power system and the transmission capacity of 220 kV power transmission lines. A change in the modulus of voltage drop at the power transmission and the angle characteristics under the influence of the regulation coefficients of the series compensation device was revealed. A criterion of aperiodic steady-state stability has been developed for systems of this kind with controlled series compensation. It differs from traditional ones by considering the changes in the voltage drop in the power transmission and it allows more accurate estimation of the proximity to the stability threshold. An assessment of aperiodic steady-state stability according to the formulated criterion for an electric power system with a controlled series compensation device on a 220 kV line was obtained. The values of the control coefficients of the series compensation device have been determined. No violation of the steady-state stability occurs under the given values. The results can be used to solve the issues of increasing the transmission capacity of transmission lines to improve the stability of the system.

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Umale, Virendra, e Sanjay Warkad. "Power quality based optimal nodal pricing in tradable electricity market". International Journal of Engineering & Technology 7, n. 2.8 (19 marzo 2018): 692. http://dx.doi.org/10.14419/ijet.v7i2.8.10560.

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Optimal Power Flow method described the nodal transmission pricing into different related factors, such as congestion,generation, power and electric load limitations. These detailsof each bus transmission prices can be used for to improve the proper usage of transmission congestion and power grid and to get reasonable transmission pricing for power structure. The proposed methodology is demonstrated on IEEE57 bus system and Maharashtra utility electric 400/765kv network.

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41

Yu. F. Romaniuk, Yu F., О. V. Solomchak e М. V. Hlozhyk. "Improving the efficiency of oilfield electric power distribution". Oil and Gas Power Engineering, n. 2(32) (27 dicembre 2019): 79–87. http://dx.doi.org/10.31471/1993-9868-2019-2(32)-79-87.

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The issues of increasing the efficiency of electricity transmission to consumers with different nature of their load are considered. The dependence of the efficiency of the electric network of the oil field, consisting of a power line and a step-down transformer, on the total load power at various ratios between the active and reactive components of the power is analyzed, and the conditions under which the maximum transmission efficiency can be ensured are determined. It is shown by examples that the power transmission efficiency depends not only on the active load, but also largely on its reactive load. In the presence of a constant reactive load and an increase in active load, the total power increases and the power transmission efficiency decreases. In the low-load mode, the schedule for changing the power transmission efficiency approaches a parabolic form, since the influence of the active load on the amount of active power loss decreases, and their value will mainly depend on reactive load, which remains unchanged. The efficiency reaches its maximum value provided that the active and reactive components of the power are equal. In the case of a different ratio between them, the efficiency decreases. With a simultaneous increase in active and reactive loads and a constant value of the power factor, the power transmission efficiency is significantly reduced due to an increase in losses. With a constant active load and an increase in reactive load, efficiency of power transmission decreases, since with an increase in reactive load, losses of active power increase, while the active power remains unchanged. The second condition, under which the line efficiency will be maximum, is full compensation of reactive power. Therefore, in order to increase the efficiency of power transmission, it is necessary to compensate for the reactive load, which can reduce the loss of electricity and the cost of its payment and improve the quality of electricity. Other methods are also proposed to increase the efficiency of power transmission by regulating the voltage level in the power center, reducing the equivalent resistance of the line wires, optimizing the loading of the transformers of the step-down substations and ensuring the economic modes of their operation.

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42

Dhama, Ankur, Avneesh Dubey e Dr Neeraj Kumar. "Advanced Power Transmission from Road to Electric Vehicle". International Journal for Research in Applied Science and Engineering Technology 10, n. 6 (30 giugno 2022): 1601–4. http://dx.doi.org/10.22214/ijraset.2022.43425.

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Abstract: With recent advancements in magnetic field simulation speed and capacity, as well as in power electronics, the area of wireless power transmission has grown considerably. Electric cars are being investigated as a possible substitute for internal combustion engine-powered vehicles in the future transport sector, particularly for CO2 reduction and alternative energy purposes. However, because to the vehicle's high weight, large capacity, and restricted driving range, many critical problems must be addressed. The article introduces the novel on-road dynamic wireless charging system for electric vehicles. Repowering technique for rechargeable vehicles is categorized as conductive or wireless, fixed or dynamic, and slow or rapid. In this paper, a concept in which an electric car is charged while in motion, without the need for a halt. Furthermore, a green and creative method to generate energy for the purpose of charging these cars is being proposed.

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Zeng, Siming, Jingran Jia, Tianxiang Ma, Boyan Jia e Xin Duan. "Application of AI Image Recognition in the Omnidirectional Monitoring System for Power Transmission Lines". Advances in Multimedia 2021 (30 novembre 2021): 1–7. http://dx.doi.org/10.1155/2021/3073248.

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With the continuous advancement of social economy, electric power, as an essential resource, plays an important supporting role for the development of industry and the lives of residents. As electric power itself is dangerous to a certain level, it is crucial to use the electric power rationally and ensure the safe application of electrical equipment. In this paper, AI image recognition technology is introduced to establish a comprehensive monitoring system for power transmission lines. Through the control of the potential risks of the transmission lines, emergency treatment of power transmission lines is implemented, which has provided an application support for the safe use of power equipment. Simulation experiments have verified that the image recognition technology based on AI can support omnidirectional monitoring of power transmission lines effectively.

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44

Tsai, L. W., e G. Schultz. "A Motor-Integrated Parallel Hybrid Transmission". Journal of Mechanical Design 126, n. 5 (1 settembre 2004): 889–94. http://dx.doi.org/10.1115/1.1767820.

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This paper presents a motor-integrated transmission mechanism for use in parallel hybrid electric vehicles. The transmission can provide five basic modes of operation that can be further classified into sixteen sub-modes: one electric motor mode, four engine modes, four engine/charge modes, three power modes, and four regenerative braking modes. Each of these sub-modes can be grouped into like clutching conditions, providing the functional appearance of a conventional 4-speed automatic transmission, with electric launch, engine-only, engine/charge, power-assist, and regeneration capability. CVT capability is provided with one of the engine/charge modes. The kinematics, static torque, and power flow relations for each mode are analyzed in detail. Finally, a clutching logic and a notional control strategy are developed. The transmission can be incorporated not only in front-wheel drive but also in rear-wheel drive vehicles. The compactness, mechanical simplicity, and operational flexibility of the transmission make it an excellent candidate for future hybrid electric vehicles.

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45

Kim, Joohyung, Yoonkwon Lee, Hyomin Jin, Seunguk Park e Sung-Ho Hwang. "Development of Shift Map for Electric Commercial Vehicle and Comparison Verification of Pneumatic 4-Speed AMT and 4-Speed Transmission with Synchronizer in Simulation". Energies 17, n. 5 (22 febbraio 2024): 1038. http://dx.doi.org/10.3390/en17051038.

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As the automotive industry transitions from internal combustion engine vehicles to the era of electric cars, extensive research is being conducted in the field of electric vehicles. While a significant portion of this research focuses on the electrification of passenger cars, commercial vehicles have experienced relatively modest changes towards electric propulsion. Particularly, challenges related to power and efficiency have prompted a concentrated effort in addressing these issues. However, improvements in the efficiency of motors and inverters are reaching their limits, necessitating the development of multi-speed transmissions for electric commercial vehicles to enhance overall system efficiency. In this paper, the development of a 4-speed transmission with a synchronizer designed for electric commercial vehicles is presented as part of a project. A transmission shift map was developed, and verification of increased power and efficiency was conducted through a comparison with the existing product (a pneumatic 4-speed internal combustion engine transmission) installed in the target commercial vehicle. The study utilized vehicle dynamics, component modeling, and simulation environments to assess the improvements in performance.

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46

Palanichamy, C., e G. Q. Kiu. "Enhanced Electric Power Transmission by Hybrid Compensation Technique". IOP Conference Series: Materials Science and Engineering 78 (2 aprile 2015): 012014. http://dx.doi.org/10.1088/1757-899x/78/1/012014.

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47

Billinton, R., G. Singh e J. Acharya. "Failure Bunching Phenomena in Electric Power Transmission Systems". Proceedings of the Institution of Mechanical Engineers, Part O: Journal of Risk and Reliability 220, n. 1 (giugno 2006): 1–7. http://dx.doi.org/10.1243/1748006xjrr11.

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48

Aldrich, William S. "ELECTRIC TRANSMISSION OF POWER FOR NAVY YARDS.-I". Journal of the American Society for Naval Engineers 14, n. 2 (18 marzo 2009): 448–57. http://dx.doi.org/10.1111/j.1559-3584.1902.tb01330.x.

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49

Aldrich, William S. "ELECTRIC TRANSMISSION OF POWER FOR NAVY YARDS.-II". Journal of the American Society for Naval Engineers 14, n. 3 (18 marzo 2009): 814–24. http://dx.doi.org/10.1111/j.1559-3584.1902.tb01366.x.

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50

Aldrich, William S. "ELECTRIC TRANSMISSION OF POWER FOR NAVY YARDS.-III". Journal of the American Society for Naval Engineers 14, n. 4 (18 marzo 2009): 1109–22. http://dx.doi.org/10.1111/j.1559-3584.1902.tb03414.x.

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