Journal articles: 'Medium Voltage Network'

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Zhu, Yanping, Jianbo Gong, and Xin Sun. "The Reliability Improvement Strategy of Medium Voltage Distribution Network Based on Network Frame Optimization." International Journal of Electrical Energy 7, no. 2 (December 2019): 58–61. http://dx.doi.org/10.18178/ijoee.7.2.58-61.

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Su, Shiwei, Yiran You, and Yu Zou. "COMPREHENSIVE METHOD FOR EVALUATION OF MEDIUM- AND LOW-VOLTAGE DISTRIBUTION NETWORK OPERATING STATE." Tekhnichna Elektrodynamika 2020, no. 6 (October 21, 2020): 47–56. http://dx.doi.org/10.15407/techned2020.06.047.

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With the development of intelligent distribution networks and access to distributed energy, the solving the problem of timely and accurate determination of the operating state of the distribution network is an urgent task. Based on an improved analysis of the principle components of the network and statements of a self-organizing neural network, this article proposes the method to evaluate the operating state of medium- and low-voltage distribution networks. At the first step, the system of evaluating indices of the network is formed by advanced component analysis. The evaluation system is grounded on four aspects, including safety, reliability, quality and economy. Next, the self-organizing neural network is used to identify and clean up the data regarding the operating state of the distribution network. At the next step, the indicators are modeled at all levels; the entropy method is applied to calculate the total weight of all indicators. Then the value of each indicator is found and the weak links of the distribution network are determined. At the final stage, the comprehensive assessment of the real operation of the distribution network in Guangxi province is carried out. As shown, the method can effectively reduce the effect of abnormal data and subjectivity factor on the results of evaluating the state of the distribution network. That confirms the feasibility and practicability of the proposed method. References 22, figures 6, tables 6.

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Firis, Fatma Avli. "Determining the optimum medium voltage level by analysis of different voltage levels." World Journal of Environmental Research 10, no. 2 (December 31, 2020): 37–49. http://dx.doi.org/10.18844/wjer.v10i2.5344.

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Electric energy, which is the main input of the growing world economy, depending on the consumption of the rapidly increasing world population and the devices fed with this energy, have become more indispensable in our lives with each passing day. In the consumption of electrical energy, determining the voltage level plays an important role in planning distribution systems that will directly affect consumers. Distribution systems in our country have been established at different levels for technical and financial reasons. Incorrect choices that can be made during the determination of the voltage level in distribution systems may increase energy unit costs and network losses, and may cause insulation and reliability problems. The aim of this study is to determine the optimum voltage level in distribution systems. A pilot region was determined for a local electricity distribution network in our country, and modeling and analysis were carried out at different voltage levels in the region with the help of a numerical analysis program. According to the results achieved, Insulation and reliability problems at low voltages are few and economic in terms of investment costs, but it has been observed that the operating load and cost are high due to high network losses. In high voltages, although the operating burden and cost are relatively low, it has been observed that the investment costs are high and the isolation and reliability problems are high. Keywords: cost; distribution; investment; operating ;Voltage

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Sudha Letha, Shimi, Angela Espin Delgado, Sarah K. Rönnberg, and Math H. J. Bollen. "Evaluation of Medium Voltage Network for Propagation of Supraharmonics Resonance." Energies 14, no. 4 (February 19, 2021): 1093. http://dx.doi.org/10.3390/en14041093.

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Power converters with high switching frequency used to integrate renewable power sources to medium and low voltage networks are sources of emission in the supraharmonic range (2 to 150 kHz). When such converters are connected to a medium voltage (MV) network these supraharmonics propagate through the MV network and can impact network and customer equipment over a wide range. This paper evaluates an existing Swedish MV electrical network and studies the pattern of supraharmonic resonance and the propagation of supraharmonics. The MV network consists of eight feeders including a small wind farm. Simulations reveal that, the bigger the MV network, the more resonant frequencies, but also the lower the amplitude of the resonance peaks in the driving point impedance. It was also identified that for short feeders as length increases, the magnitude of the transfer impedance at supraharmonic frequency decreases. For further increment in feeder length, the magnitude increases or becomes almost constant. For very long feeders, the transfer impedance further starts decreasing. The eight feeders in the network under study are similar but show completely different impedance versus frequency characteristics. Measurements at the MV side of the wind farm show time varying emissions in the supraharmonic range during low power production. The impact of these emissions coupled with system resonance is examined.

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Simiyu, Patrobers, Ai Xin, Kunyu Wang, George Adwek, and Salman Salman. "Multiterminal Medium Voltage DC Distribution Network Hierarchical Control." Electronics 9, no. 3 (March 19, 2020): 506. http://dx.doi.org/10.3390/electronics9030506.

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In this research study, a multiterminal voltage source converter (VSC) medium voltage DC (MVDC) distribution network hierarchical control scheme is proposed for renewable energy (RE) integration in a co-simulation environment of MATLAB and PSCAD/EMTDC. A DC optimal power flow (DC OPF) secondary controller is created in MATLAB. In PSCAD/EMTDC, the main circuit containing the adaptive DC voltage droop with a dead band and virtual synchronous generator (VSG) based primary controller for the VSCs is implemented. The simulation of the MVDC network under the proposed hierarchical control scheme is investigated considering variations in wind and solar photovoltaic (PV) power. The network is also connected to the standard IEEE-39 bus system and the hierarchical scheme tested by assessing the effect of tripping as well as restoration of the REs. The results show that during random variations in active power such as increasing wind and PV power generation, a sudden reduction or tripping of wind and PV power, the primary controller ensures accurate active power sharing amongst the droop-based VSCs as well as regulates DC voltage deviations within the set range of 0.98–1.02 pu with an enhanced dynamic response. The DC OPF secondary control optimizes the system’s losses by 38% regularly giving optimal droop settings to the primary controllers to ensure proper active power balance and DC voltage stability. This study demonstrates that the hierarchical control strategy is effective for RE integration in the MVDC distribution network.

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Inagaki, Junichi, and Yasuhiro Hayashi. "Experimental Analysis on Influences of Harmonic Voltage at High-Voltage Network on Harmonic Current at Medium-Voltage Network." Journal of International Council on Electrical Engineering 2, no. 2 (April 2012): 146–52. http://dx.doi.org/10.5370/jicee.2012.2.2.146.

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El-Sayed Gouda, Osama, and Noura Ahmed Elshesheny. "Simulation of the Lightning Back-Flashover for Medium Voltage Distribution Network." Indonesian Journal of Electrical Engineering and Computer Science 3, no. 2 (August 1, 2016): 264. http://dx.doi.org/10.11591/ijeecs.v3.i2.pp264-272.

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Lightning strikes represent a considerable cause of short interruptions in electrical overhead line networks. The over voltages caused by lightning cannot be avoided but their influence can be limited by appropriate over voltage protection. This paper presents analysis study on some factors affecting the back flashover of Egyptian 66 kV distribution lines using Alternative Transient Program (ATP). The study includes the modeling of 66 kV distribution lines, the effects of magnitude and the front and tail times of lightning wave on the back flashover voltages, the effects of the striking distance, and the using of counterpoise wires on the back flashover on the 66 kV line towers. In this paper the 66 kV lines sag is neglected and the soil ionization by the flow of the stroke current is considered.

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Toader, Dumitru, Stefan Haragus, and Constantin Blaj. "Detection of broken conductor with ground contact faults in medium voltage power networks." Facta universitatis - series: Electronics and Energetics 19, no. 3 (2006): 429–38. http://dx.doi.org/10.2298/fuee0603429t.

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A major problem concerning the operation of medium voltage power networks refers to the neutral-point grounding system. Several technical solutions are in use, none of them being completely satisfactory. One criterion to appreciate the efficiency of a grounding system is the ability of the network?s protective system to accurately detect various types of faults such as broken conductor with ground contact faults. This type of fault make a relatively important figure (3 to 10 %) in the total faults statistics for a medium voltage network. In order to detect such faults, the sensed variables are the zero-sequence voltage and the neutral-grounding current. In this paper an analytical and computational analysis is performed to see how various fault and network parameters affect these variables, assuming different grounding systems. Measurements made in two real medium voltage networks show good agreement with the theoretical results.

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Kacejko, Piotr, and Paweł Pijarski. "Optimal Voltage Control in MV Network with Distributed Generation." Energies 14, no. 2 (January 17, 2021): 469. http://dx.doi.org/10.3390/en14020469.

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The article presents the concept of voltage control in a medium-voltage network, using the classical control of a HV/MV (High Voltage/Medium Voltage) transformer and active participation of distributed generation sources. The proposed solution is based on the results of the optimization process. The objective function is considered as a single-criterion—the voltage quality indicator or value of power losses in the network, and optionally as two-criteria (voltage quality and losses combined, with appropriately selected weight factors). The analysis carried out for random selection of independent variables, using the original heuristic algorithm, indicated a very high efficiency of the proposed control process, compared to the traditional approach. A significant improvement in the voltage quality index and reduction of losses was found, which justifies the advisability of looking for new solutions in the field of voltage control in MV networks, taking into account active participation of distributed generation.

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Silva, Artur de Araujo, Claudio Floridia, and Joao Batista Rosolem. "Study of a Current and Voltage Polarization Sensor Network." Sensors 21, no. 13 (July 1, 2021): 4528. http://dx.doi.org/10.3390/s21134528.

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Sensors based on polarization are suitable for application in power grids due to their excellent characteristics, such as high electrical insulation, non-magnetic saturation, oil-free, no risk of explosive failures, and high bandwidth. Utility companies are incorporating new technologies that are driving the evolution of electrical systems. Thus, it is interesting to evaluate the possibility of using polarization sensors in a network configuration. In this work, we present an experimental study of a current and voltage polarization sensor network applied to a medium voltage distribution grid. The current sensor is based on the Faraday effect, and the voltage sensor uses the Pockels effect. Both sensors use a 90° polarization degree between the two output ports to compensate for the various impairments on the measurements by applying the difference-over-sum. The network uses a DWDM topology centered at the 1550 nm range, and both current and voltage sensors in this work used this spectral band. We evaluated the sensor node in terms of accuracy according to IEC standard 61869-10 and IEC standard 61869-11. Considering that an important application of this sensor network is in the aerial cable of medium voltage networks, sensor node accuracy was also estimated in the presence of cable vibration. The calculated power budget of the proposed network indicates that reaching ten nodes of current and voltage sensors in a 10 km optical link is possible, which is enough for a medium urban voltage distribution network.

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Montoya, Oscar Danilo, Walter Gil-González, Andrés Arias-Londoño, Arul Rajagopalan, and Jesus C. Hernández. "Voltage Stability Analysis in Medium-Voltage Distribution Networks Using a Second-Order Cone Approximation." Energies 13, no. 21 (November 2, 2020): 5717. http://dx.doi.org/10.3390/en13215717.

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This paper addresses the voltage stability margin calculation in medium-voltage distribution networks in the context of exact mathematical modeling. This margin calculation is performed with a second-order cone (SOCP) reformulation of the classical nonlinear non-convex optimal power flow problems. The main idea around the SOCP approximation is to guarantee the global optimal solution via convex optimization, considering as the objective function the λ-coefficient associated with the maximum possible increment of the load consumption at all the nodes. Different simulation cases are considered in one test feeder, described as follows: (i) the distribution network without penetration of distributed generation; (ii) the distribution network with penetration of distributed generation; and (iii) the distribution grid with capacitive compensation. Numerical results in the test system demonstrated the effectiveness of the proposed SOCP approximation to determine the λ-coefficient. In addition, the proposed approximation is compared with nonlinear tools available in the literature. All the simulations are carried out in the MATLAB software with the CVX package and the Gurobi solver.

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Kotsalos, Konstantinos. "Decentralized Voltage Regulation in radial Medium Voltage Networks with high presence of Distributed Generation." U.Porto Journal of Engineering 3, no. 1 (March 26, 2018): 26–38. http://dx.doi.org/10.24840/2183-6493_003.001_0003.

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The continuous growth of distributed generation along the medium voltage distribution networks (MVDN) induces multifaceted technical challenges that have to be addressed by alternative control architecture schemes beyond the centralized strategies and the fit and forget doctrine. The active participation of DG essentially drives the network to pave towards the Smart Grid concept. This paper entails a decentralized control strategy which is based on a sensitivity analysis to stipulate the proper dispatch set-points for the DGs; hence, all nodal voltages are in permissible bounds. An overview of sensitivity approaches is presented and discussed for their adequacy to be used in MVDN. The proposed method is simulated on a 13- Node Test Feeder IEEE benchmark, while its consistency is compared with a centralized scheme.

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Toader, Dumitru, Marian Greconici, Daniela Vesa, Maria Vintan, Claudiu Solea, Adrian Maghet, and Ildiko Tatai. "The Influence of the Characteristics of the Medium Voltage Network on the Single Line-to-Ground Fault Current in the Resistor Grounded Neutral Networks." Designs 5, no. 3 (August 7, 2021): 53. http://dx.doi.org/10.3390/designs5030053.

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One important problem in the operation of medium voltage networks is the detection of a single-line-to-ground fault in its incipient state, when the fault resistance values are very high. In a medium voltage (MV) distribution network with a neutral grounding resistor (NGR), one of the methods employed to discriminate a single line-to-ground fault is the use of an overcurrent relay with an operating characteristic adjusted according to the effective value of the current flowing through the limiting resistor. In case of a single line-to-ground fault with a high fault resistance value, the correct tripping settings of the protective relay require the precise computation of this current. In comparison to the assumptions made by the models from the literature—the three-phase voltage system of the medium voltage busbars is symmetrical and there are no active power losses in the network insulation—the model proposed in this paper considers the pre-fault zero-sequence voltage of the medium voltage busbars and the active power losses in the network insulation, which is necessary in certain fault conditions where the use of the former leads to unacceptable errors.

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Ma, Xing He, Bing Yao Yan, and Yong Sheng Wang. "Medium Voltage Distribution Network Voltage Grade Sequence Comprehensive Evaluation Based on Gray/Ahp." Applied Mechanics and Materials 273 (January 2013): 332–37. http://dx.doi.org/10.4028/www.scientific.net/amm.273.332.

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Analyze our country medium voltage distribution network voltage grade sequence current situation, consider technological factors, economic factors and equipment factors, establish voltage grade sequence analysis model, through the grey /ahp, evaluation analysis model. Finally, Given the typical regional network model, the grey/ahp analyses. Example showes, the method is helpful for regional power grid voltage grade the qualitative and quantitative evaluation.

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Bassan, Fabio R., Joao B. Rosolem, Claudio Floridia, Bruno N. Aires, Rodrigo Peres, Javier F. Aprea, Carlos Alexandre M. Nascimento, and Fabiano Fruett. "Power-over-Fiber LPIT for Voltage and Current Measurements in the Medium Voltage Distribution Networks." Sensors 21, no. 2 (January 14, 2021): 547. http://dx.doi.org/10.3390/s21020547.

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In this work, we present the design, laboratory tests, and the field trial results of a power-over-fiber (PoF) low power instrument transformer (LPIT) for voltage and current measurements in the medium voltage distribution networks. The new proposed design of this power-over-fiber LPIT aims to overcome the drawbacks presented by the previous technologies, such as the continuous operation (measuring and data transmission) for a wide current range conducted in the medium voltage transmission lines, damage due to lightning strikes, accuracy dependency on vibration, position and temperatures. The LPIT attends the accuracy criteria of IEC 61869-10 and IEC 61869-11 in terms of current and voltage accuracy and it attends the practical criteria adopted by Utilities companies including voltage measurements without removing the coating of the covered conductors. The PoF based LPIT was developed to be applied at 11.9 kV, 13.8 kV, and 23.0 kV phase-to-phase nominal voltages, and in two current ranges 1.25–30 A and 37.5–900 A. The digital data transmission of current, voltage, and temperature from the sensing unit to the processing unit uses a special synchronism technique and it is performed by two 62.5 µm multimode fibers in 850 nm. The optical powering in 976 nm is also performed by one 62.5 µm multimode fiber from the processing unit to the sensor unit. We presented all details of the sensor design and its laboratory characterization in terms of accuracy and temperature correction. We also presented the results of field tests of the sensor made in two different conditions: in a standard distribution network and an experimental hybrid fiber/power distribution network. We believe that these studies aim to incorporate optical fiber and devices, digital technologies, communications systems in electrical systems driving their evolution.

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Chen, Xiaofang, Li’an Chen, Dong Wang, and Qihao Chen. "Study on safety operation of medium voltage distribution network." E3S Web of Conferences 260 (2021): 02004. http://dx.doi.org/10.1051/e3sconf/202126002004.

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Aiming at the problem of safe operation in the medium voltage distribution network with neutral point grounding through small resistance, the distribution network model was built, and on this basis, MW-level photovoltaic (PV) system, doubly fed Induction generator (DFIG) wind turbine, permanent magnet synchronous generator (PMSG) wind turbine and energy storage device was connected respectively in this paper. The ground current and earth potential rise was studied when the power was delivered by mistake. The simulation results show that in the system with neutral point grounding through small resistance, whether it is the traditional or the active distribution network, the three-phase power delivery method is more able to ensure the personal safety of power grid operators. However, The access to distributed generator (DG) in the distribution network will have a greater impact on ground current and earth potential rise in the case of three-phase power delivery. Especially when the ground current and earth potential rise will increase after DG connected to distribution network, which is still likely to pose a threat to personal safety and needs further research.

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BORISOV, Ruslan K., Eugene V. KOLOMIYETS, and Rafik F. GAFFAROV. "High-Frequency Switching Overvoltages in a Medium-Voltage Network." Elektrichestvo 4, no. 4 (2020): 4–9. http://dx.doi.org/10.24160/0013-5380-2020-4-4-9.

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Li, Xiaorong, Shunxin Li, Dapeng Liang, Anjia Mao, Zixia Pei, and Lanlan Chen. "Medium Voltage Distribution Network Reconfiguration Considering Reactive Power Compensation." International Journal of Energy and Power 4 (2015): 75. http://dx.doi.org/10.14355/ijep.2015.04.012.

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Safigianni, Anastasia S., George N. Koutroumpezis, and Vassilis C. Poulios. "Mixed distributed generation technologies in a medium voltage network." Electric Power Systems Research 96 (March 2013): 75–80. http://dx.doi.org/10.1016/j.epsr.2012.10.017.

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Jabbar, Zaid Abdulzahra. "Smart Protection System for Medium Voltage Using Wireless Network." IJARCCE 10, no. 7 (July 30, 2021): 5–14. http://dx.doi.org/10.17148/ijarcce.2021.10702.

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Yao, Sen Jing, Zheng Guo Zhu, Hua Ying Zhang, Jun Wei Cao, and Guang Yi Zhang. "The Design of Filter Parameters of Dynamic Voltage Restorer in Medium Voltage Network." Applied Mechanics and Materials 654 (October 2014): 133–41. http://dx.doi.org/10.4028/www.scientific.net/amm.654.133.

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Dynamic Voltage Compensator (DVR) is able to handle the dynamic power quality problems in distribution network, such as voltage sags and voltage unbalance, and the parameters of the output filter will have important affect on the compensation results. In this paper, the parameter design method of the output filter of a cascaded H-bridge based DVR applied in medium-voltage distribution grid is studied. Through the analysis of the case when filter inductor current has the maximum value, the theoretical expression of the relationship between the low limit of the value of filter inductor and the capability of voltage compensation and power factor is derived. Meanwhile, the method of selecting the filter capacitor value is obtained. The realization of the proposed method are given by taking an engineering project as an example, the correctness and validity of the design method of filter parameters proposed in this paper are verified by simulation.

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Yang, Xiaoping, and Feng Xiao. "Research on Voltage Control of Multi Terminal Flexible Medium Voltage DC Distribution Network." Journal of Physics: Conference Series 1639 (October 2020): 012052. http://dx.doi.org/10.1088/1742-6596/1639/1/012052.

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Costa Nascimento, Priscila, Michel Girotto de Oliveira, and José Carlos M. Vieira. "Investigation on Using Low Voltage Automatic Regulation to Minimize the Impacts of Charging Plug-in Electric Vehicles in Distribution Systems." Renewable Energy and Power Quality Journal 19 (September 2021): 85–90. http://dx.doi.org/10.24084/repqj19.222.

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The growth of micro and mini distributed generation and, more recently, the use of electric energy storage systems and the incentives for electric mobility are important examples of the transformations that distribution networks have been going through. In this context, this paper firstly presents the impacts of uncoordinated plug-in electric vehicles (PEVs) charging in a real Brazilian distribution system. Four scenarios were elaborated with different PEVs penetration levels and the results show increased voltage unbalance, system losses, and violations of the steady-state voltage limits, even in the presence of an automatic voltage regulator installed in the medium voltage network. Then, as the main contribution, the potential usage of automatic voltage regulation at the low voltage network was investigated to minimize the negative impacts of uncontrolled PEV charging on distribution system steady-state operation. It is important to highlight that this is not a common practice of utilities in Brazil. The obtained results showed that regulating the voltage at the low voltage side could be an effective solution to keep the voltages within statutory limits.

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Toader, Dumitru, Marian Greconici, Daniela Vesa, Maria Vintan, and Claudiu Solea. "Analysis of the Influence of the Insulation Parameters of Medium Voltage Electrical Networks and of the Petersen Coil on the Single-Phase-to-Ground Fault Current." Energies 14, no. 5 (March 1, 2021): 1330. http://dx.doi.org/10.3390/en14051330.

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Settings of protection are essential to ensure the sensitivity and selectivity needed to detect defects. Making the correct settings requires the calculation of the fault currents with as little error as possible. Fault currents are influenced by the parameters of the electrical networks, including the state of the insulation and the Petersen coil, which changes during their operation electrical networks. This paper analyzes how the insulation parameters of medium voltage power lines, the parameters of the Petersen coil used to treat the neutral of the medium voltage electrical network and the value of the resistance at the fault location influence the fault current in the case of a single-phase fault. The large number of single-phase faults that occur in medium voltage electrical networks justifies this analysis. The symmetrical components method was used to calculate the fault current. The results obtained by calculation were verified experimentally by causing a single-phase-to-ground fault in a real medium voltage network. The paper presents the situations in which the analytical calculation of the single-phase-to-ground fault current can lead to inadmissibly large errors, even over 50%, but also the situations in which the errors fall below 3%.

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Jia, Yu Wei, Wang Ding, and Jia Dong Huang. "Medium Voltage Distribution Network Planning of City Based on Reliability." Advanced Materials Research 655-657 (January 2013): 2401–4. http://dx.doi.org/10.4028/www.scientific.net/amr.655-657.2401.

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Power network planning is an important foundation of the development of the grid, its planning level and quality directly affects the security, reliability, and economic level of the power grid. This article will carry on the analysis according to the reliable condition to the city distribution network, mainly includes the structure of the urban network wiring, the form of the host wiring and medium voltage distribution network wiring and so on.

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Cui, Yan Yan, Da Pu Zhao, Wei Liu, and Yu Long. "Power Supply Reliability Evaluation Based on the Characteristics Mode of Large-Scale Medium Voltage Distribution Network." Applied Mechanics and Materials 341-342 (July 2013): 1380–83. http://dx.doi.org/10.4028/www.scientific.net/amm.341-342.1380.

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It is difficult to evaluate and analyze power supply reliability of large-scale medium voltage distribution network by detailed modeling method. The paper proposes a power supply reliability evaluation method of large-scale medium voltage distribution network, which is based on the network reliability characteristics model. Lines with similar structural characteristics are designated as one model. The reliability index of each mode can be represented by the typical lines. The assessment principle, process and the advantages of this method are elaborated. The medium voltage distribution network of Nanjing area is taken as an example to evaluate power supply reliability. And the results are compared with historical statistics. The result shows that the method can greatly reduce the workload and has high accuracy. It can be used to evaluate the reliability of large-scale medium voltage distribution network.

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Marciniak, Lubomir, and Mateusz Piątek. "The influence of the network asymmetry on the settings and sensitivity of an earth fault protection using higher harmonics." E3S Web of Conferences 84 (2019): 02008. http://dx.doi.org/10.1051/e3sconf/20198402008.

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Detection of high resistance earth faults in medium voltage networks is an important problem due to ineffectiveness of traditional earth fault protections. Such short circuits can be detected by the criterion of a reactive power of higher harmonics for zero sequence current and voltage. The main problem is determination of the power setting value in the protection, which depends on the asymmetry of phase-to-earth capacitances and higher harmonics in supply voltages, which are generated by non-linear loads. The intensive tests of the asymmetry of the zero sequence currents and voltages for harmonics and their reactive power have been carried out in 15 kV compensated network as a function of all relevant parameters, i.e.: maximum capacitance deviation of the network and protected line, percentage content of harmonics in supply voltages, capacitive current of the network and the line. It has been shown that third harmonics of the zero sequence voltage and current are the best suited for practical use, since the asymmetry reactive power of these components is the smallest among the considered harmonics and the protection sensitivity will be the highest.

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Eldesouki, Eman, M. Alaam, and Ahmed Refaat Azmy. "Optimal Overcurrent protection for industrial medium voltage network (Dept. E)." Bulletin of the Faculty of Engineering. Mansoura University 40, no. 2 (July 7, 2020): 1–11. http://dx.doi.org/10.21608/bfemu.2020.101221.

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Stefenon, Stéfano Frizzo, Laio Oriel Seman, Nemesio Fava Sopelsa Neto, Luiz Henrique Meyer, Ademir Nied, and Kin-Choong Yow. "Echo state network applied for classification of medium voltage insulators." International Journal of Electrical Power & Energy Systems 134 (January 2022): 107336. http://dx.doi.org/10.1016/j.ijepes.2021.107336.

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Nikolaev, A. A., M. V. Bulanov, and K. A. Shakhbieva. "Development of adaptive PWM algorithm for an active rectifier and a method for diagnosing resonant phenomena in in-plant networks." Vestnik IGEU, no. 4 (August 31, 2020): 44–54. http://dx.doi.org/10.17588/2072-2672.2020.4.044-054.

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Currently, adjustable medium voltage electric drives are mostly based on frequency converters with active rectifiers. In cases where the medium voltage network has extended cable lines, adverse resonance phenomena can occur in the network, due to which, when significant harmonics of the FC with AR are applied to the resonance region, critical voltage distortions occur in the distribution network. The solution to this problem can be the installation of special filters that correct the frequency response of the network. However, this requires experimental determination of the frequency response for all possible modes of power supply, which is a difficult technical task in practice. Therefore, it is relevant to study an adaptive method of reducing voltage distortions caused by the operation of a FC in networks with resonant phenomena.When developing a method for diagnosing resonance phenomena and an improved PWM algorithm, the existing PWM algorithms used by manufacturers of electric drives with AR has been analyzed and the well-known methods of mathematical modeling of frequency converters and power supply systems has been used. The main assumption of the model is representation of the inverter as a current source. Anadaptive method for reducing distortion in networks with resonant phenomena based on improved PWM algorithm that allows excluding from the harmonic series of the voltage curve of the frequency converter the group of harmonics included in the resonance region has been developed.A comparative analysis of the FC with non-adaptive and adaptive PWM has been performed using simulation model of the FC system with AR – medium voltage network. It has been found that the use of the adaptive PWM algorithm significantly reduces the distortion in the network in the presence of resonance phenomena.Method proposed can be applied to detect in-plant networks resonance in different frequency ranges when power supply mode is changing. Adaptive algorithm can be applied in the design of FC with AR.

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Dib, M., A. Nejmi, M. Ramzi, and M. Elhafyani. "Voltage regulation and minimization of loses in the presence of renewable energy sources on the medium voltage network." International Journal of Engineering & Technology 9, no. 1 (February 18, 2020): 202. http://dx.doi.org/10.14419/ijet.v9i1.29929.

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The Moroccan electricity network has been designed and sized to work with high power outputs connected to the transmission network. This it delivers a unidirectional power flow from production to consumption. In this configuration, the electricity network carries electricity from production plants mainly connected to the transmission network to customers through the distribution network. Therefore, voltage-setting devices on the distribution network such as load-adjustable power transformers and medium voltage MV capacitor banks are set and operated. The inclusion of the Decentralized Generation (DG) based on renewable energies can induce a reversal of the power flow on the distribution network. This raises problems of voltage regulation in the presence of renewable energy sources. This article shows the limit of the current voltage regulation deployed solutions and exposes a solution for adjusting the voltage on the distribution grid in the presence of renewable energy sources connected to medium voltage MV. We will apply ETAP software to a real network located in the eastern zone for the conducted investigation. Later, an optimization approach aiming to minimize losses and improve the voltage plan will be presented at the end.

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Jurnal, Redaksi Tim. "PEMASANGAN ARRESTER DAN ARCING HORN PADA PENGHANTAR BERISOLASI DI SUTM 20 kV." Sutet 7, no. 1 (December 20, 2018): 37–41. http://dx.doi.org/10.33322/sutet.v7i1.165.

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Temporary disturbance in medium-voltage air ducts is a disturbance mainly caused by lightning. This disorder is divided into two kinds according to the occurrence of lightning strikes, namely direct strike and indirect strike (induction). This disorder is very difficult to predict, therefore it needs good protection. To protect the equipment from a lightning strike then mounted arresters and arcing horn mounted on a 20kV SUTM network simultaneously. The combination of arresters and arcing horns in medium voltage networks can improve the reliability of the disturbances caused by tighter lightning. Lightning strikes an isolated conductor causing a flashover and causing a disruption to the network, and can damage the conductor, in which case the arrester and arcing horn secure the conductor so as not to break due to the spark jump followed by the current follow-up, in this paper discussed how Arresters and arcing horns installed simultaneously at medium voltage.

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Abdelkader, Bouafia, and Labed Djamel. "Contribution of DGs in the stability and voltage drop reduction for future MV network in desert regions." International Journal of Power Electronics and Drive Systems (IJPEDS) 11, no. 2 (June 1, 2020): 977. http://dx.doi.org/10.11591/ijpeds.v11.i2.pp977-987.

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<p>Day by day, the integration of decentralized generation in medium voltage networks becomes more important during the last years and even in the near future. This increase causes, at the same time, several negative effects and rarely positive impacts on the stability of the network. Therefore, this work aims at analyzing the impact of ambient temperature on radial distribution network parameters’ e.g.: voltage drop and stability voltage level (index). Based on MATLAB program, different analyses of distributed generation (DG) insertion influence’s on voltage drop in the radial distribution feeder, as well as the influence of climatic conditions such as ambient temperature on network parameters. The Integration of Photovoltaic DGs in MV networks can play an important role in reducing the global warming effect (in voltage drop, and voltage stability index) especially in radial distribution feeder. Furthermore, it protects network’s parameters if its location and power are well selected.</p>

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Syvokobylenko, V. F., and V. A. Lysenko. "APPLICATION OF WAVELET TRANSFORM FOR PHASE-TO-GROUND FAULT PROTECTION IN MEDIUM VOLTAGE ELECTRICAL NETWORKS." Tekhnichna Elektrodynamika 2021, no. 4 (June 17, 2021): 55–62. http://dx.doi.org/10.15407/techned2021.04.055.

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For electrical networks with voltage of 6-35 kV with a compensated, isolated or resistor-grounded neutral, a phase-to-ground protection has been developed, in which, based on the results of the time-frequency wavelet transform of zero-sequence currents, voltages and their derivatives, using the obtained analytical expression, the total reactive power wavelet for different frequencies is determined. It is shown that at the initial moment of a phase-to-ground fault on the damaged feeder the power is always positive, and on the undamaged feeder it is negative, regardless of the operating mode of the neutral. Wavelet transform coefficients are found by convolution of discrete values of measured signals with sine-cosine signals of the Morlet mother function. The time-reversed sequence of these signals is obtained using a matrix for which the rules for its formation are stated. An excess of the zero phase sequence voltage amplitude of the set value is used as a starting protection element. With the help of a mathematical model of the network, studies of the behavior of protection in case of blind and arc phase-to-ground faults at various degrees of compensation of capacitive currents, at various voltage values at the moment of the short circuit have been carried out. In all modes, a reliable protection operation is obtained, the sensitivity of which is an order of magnitude higher than the protection based on Fourier transforms. Positive results of testing a protection sample implemented on a microprocessor-based element base at a laboratory stand are obtained. References 20, figures 7, tables 2.

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Dashtdar, Majid, and Masoud Dashtdar. "Detecting the Fault Section in the Distribution Network with Distributed Generators Based on Optimal Placement of Smart Meters." Scientific Bulletin of Electrical Engineering Faculty 19, no. 2 (October 1, 2019): 28–34. http://dx.doi.org/10.1515/sbeef-2019-0017.

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AbstractOne of the most important issues in employing distribution networks is detecting the fault location in medium-voltage distribution feeders. Due to the vastness of distribution networks and growing distributed generation (DG) sources in this network, detection is difficult with the common methods. The aim of this paper is to present a method based on voltage distributed meters in a medium-voltage distribution network (by smart meters installed along the feeder) in order to detect the fault location in the presence of DG sources. Due to vastness of distribution network and cost of installing smart meters, it is not economically possible to install meters in all the Buses of the network. That’s why in this article, combination of genetic and locating algorithms and fault-based on voltage drop has been used to suggest a method to optimize the meter locations. In order to evaluate the efficiency of the method suggested, first we determine the optimal number and location of the meters and then we apply the fault that has been simulated in different Buses of the sample network, using PSCAD/EMTDC software. After results analysis, the fault location is estimated by MATLAB. Simulation results show that the fault locating method by optimal number of meters has good efficiency and accuracy in detecting faults in different spots and in different resistance ranges.

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Ouali, Saad, and Abdeljebbar Cherkaoui. "Optimal Allocation of Combined Renewable Distributed Generation and Capacitor Units for Interconnection Cost Reduction." Journal of Electrical and Computer Engineering 2020 (July 23, 2020): 1–11. http://dx.doi.org/10.1155/2020/5101387.

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In this paper, a new methodology for the optimal investment in distributed generation is presented, based on an optimal allocation of combined DG and capacitor units to alleviate network voltage constraints and reduce the interconnection cost of renewable generation integration in public medium voltage distribution networks. An analytical optimization method is developed, with the inclusion of practical considerations that are typically neglected in developed works: network topology reconfiguration and the geographical data of the generation land-use and network infrastructure. Powerful results concluded from a sensitivity analysis study of the most impacted parts of the network by the variation of active and reactive power injection under network topology reconfiguration are used as a basis for capacitor units placement. A case study, with two meshed IEEE 15-bus feeders and a new DG to connect, geographical dispersed, are used to simulate the performance of the proposed approach. A cost evaluation of the obtained results proves the effectiveness of the proposed approach to reduce the required charges for connecting new renewable generation units in medium voltage distribution system.

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Syaifuddin F, Ahmad, Arief Budi Laksono, and Suharijanto Suharijanto. "Studi Analisis Perbandingan Rugi Daya Pada Titik Sambung Pierching Connector Dengan Line Tap Connector Pada Jaringan Tegangan Rendah." Jurnal Elektro 3, no. 1 (May 4, 2018): 24. http://dx.doi.org/10.30736/je.v3i1.215.

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Distribution system is divided into primary and secondary distribution networks. The primary distribution network is the network of the substation to the distribution, while the secondary distribution is the channel network from the substation transformer is distributed to the consumer or the load. Primary distribution network is better known as medium voltage network (JTM 20kV) while secondary distribution is low voltage network (JTR 220 / 380V). The distribution network is part of the power system closest to the customer or the load compared to the transmission network.At this time PT. PLN (Persero) experiencing power loss that occurs at the point of connection of low voltage on the use of pierching connector. This study is to analyze the calculation of loss of power at low voltage network (JTR) by doing comparison of measurement between input with output at connection point of pierching connector with line tap connector. For conditions required evaluation and analysis for replanning that takes into account the planning criteria such as voltage drop and take into account the loss of power.

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Du, Yu. "Research on Reactive Power and Voltage Optimization of Regional Distribution Network." Applied Mechanics and Materials 58-60 (June 2011): 474–79. http://dx.doi.org/10.4028/www.scientific.net/amm.58-60.474.

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The high-medium voltage level distribution networks have their own characters. Because of the radiation characteristic of the network, this paper looks on the network as the combination of some small optimization unit. The paper simplifies the resolution of the reactive power optimization by the way of alternatively solving the adjusting transformer taps and switching capacity banks. At the same time, considering the practical operation request, the paper evaluates the regulation effect and improves the practicability of the software.

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Zang, Li Wei, Jie Mao, and Qiang Gao. "Research of Distribution Network Communication Based on P1901." Applied Mechanics and Materials 631-632 (September 2014): 864–68. http://dx.doi.org/10.4028/www.scientific.net/amm.631-632.864.

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Medium voltage broadband power line communication is the key component of distribution automation communication. In this paper, medium voltage broadband buried cable communication system was studied. The buried cable communication channel model was established; Reference to the IEEE P1901 standard requirements, the broadband power line communication system based on OFDM was simulated; the transmission rate was tested with the experimental system. The simulation results and actual tests show that the broadband buried cable communication system has good performance and high transmission rate which can meet the requirements of distribution network automation.

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Ren, Ye, Xiu Ge Zhang, and Xun Cheng Huang. "Study on the Prediction of Line Loss Rate Based on the Improved RBF Neural Network." Advanced Materials Research 915-916 (April 2014): 1292–95. http://dx.doi.org/10.4028/www.scientific.net/amr.915-916.1292.

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According to characteristics of medium voltage distribution network, use raw data that are easily collected to study an accurate fast and simple line loss calculation method of the medium voltage distribution network, that is the radial basis function neural network algorithm. In order to improve the power system line loss rate accuracy, the paper puts forward using alternating gradient algorithm to improve the radial basis function (RBF) neural network. The simulation results show that the algorithm is feasible.

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Fandi, Ghaeth, Famous Omar Igbinovia, Josef Tlusty, and Rateb Mahmoud. "Voltage regulation and power losses reduction in a wind farm integrated MV distribution network." Journal of Electrical Engineering 69, no. 1 (January 1, 2018): 85–92. http://dx.doi.org/10.1515/jee-2018-0012.

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Abstract A medium-voltage (MV) wind production system is proposed in this paper. The system applies a medium-voltage permanent magnet synchronous generator (PMSG) as well as MV interconnection and distribution networks. The simulation scheme of an existing commercial electric-power system (Case A) and a proposed wind farm with a gearless PMSG insulated gate bipolar transistor (IGBT) power electronics converter scheme (Case B) is compared. The analyses carried out in MATLAB/Simulink environment shows an enhanced voltage profile and reduced power losses, thus, efficiency in installed IGBT power electronics devices in the wind farm. The resulting wind energy transformation scheme is a simple and controllable medium voltage application since it is not restrained by the IGBT power electronics voltage source converter (VSC) arrangement. Active and reactive power control is made possible with the aid of the gearless PMSG IGBT power converters.

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De Maria, Letizia, and Giuseppe Rizzi. "Ozone Sensor for Application in Medium Voltage Switchboard." Journal of Sensors 2009 (2009): 1–5. http://dx.doi.org/10.1155/2009/608714.

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The application of a new spectroscopic type fiber sensor for ozone detection in electrical components of Medium Voltage (MV) network is evaluated. The sensor layout is based on the use of an optical retroreflector, to improve the detection sensitivity, and it was especially designed for detecting in situ rapid changes of ozone concentration. Preliminary tests were performed in a typical MV switchboard. Artificial defects simulated predischarge phenomena arising during real operating conditions. Results are discussed by a comparison with data simultaneously acquired with a standard partial discharge system.

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BERZAN, V., I. ERMURACHI, R. PENTIUC, C. FILOTE, and C. POPA. "Solid State Transformer for Connecting Consumers to the Medium Voltage Network." Advances in Electrical and Computer Engineering 20, no. 1 (2020): 57–62. http://dx.doi.org/10.4316/aece.2020.01008.

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Simiyu, Patrobers, Ai Xin, Niasse Mouhammed, Wang Kunyu, and Joseph Gurti. "Multi-terminal Medium Voltage DC Distribution Network Large-signal Stability Analysis." Journal of Electrical Engineering & Technology 15, no. 5 (August 10, 2020): 2099–110. http://dx.doi.org/10.1007/s42835-020-00508-4.

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Stojanović, Dobrivoje P., Lidija M. Korunović, and J. V. Milanović. "Dynamic load modelling based on measurements in medium voltage distribution network." Electric Power Systems Research 78, no. 2 (February 2008): 228–38. http://dx.doi.org/10.1016/j.epsr.2007.02.003.

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Li, Cheng Xi, Wen Jun Yan, and Qiang Yang. "Power Factor Optimization of Distributed Generations in Distribution Networks Based on Improved Particle Swarm Optimization Method." Advanced Materials Research 516-517 (May 2012): 1408–13. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1408.

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The gradually extensive penetration of small-scale distributed renewable generators in existing medium-voltage power distribution networks highlights many technical challenges which call for urgent solutions from power utilities. This paper attempts to optimize the power factor of distributed generators (DGs) integrated in distribution networks and presents a novel algorithmic solution. With the aim of minimizing power loss whilst maintaining the node voltage, the problem is formulated with a mathematical model elaborating the DGs and a set of constraints in distribution networks and addressed through adopting an extended particle swarm optimization (PSO) approach. The suggested algorithm is assessed through numerical simulation experiments with the IEEE 33-bus system and the outcome shows that the optimization algorithm can effectively reduce the power loss and promote the node voltages across the overall distribution network.

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Jamili, N. S. B., M. R. Adzman, S. R. A. Rahim, S. M. Zali, M. Isa, and H. Hanafi. "Evaluation of earth fault location algorithm in medium voltage distribution network with correction technique." International Journal of Electrical and Computer Engineering (IJECE) 9, no. 3 (June 1, 2019): 1987. http://dx.doi.org/10.11591/ijece.v9i3.pp1987-1996.

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This paper focused on studying an algorithm of earth fault location in the medium voltage distribution network. In power system network, most of the earth fault occurs is a single line to ground fault. A medium voltage distribution network with resistance earthing at the main substation and an earth fault attached along the distribution network is modeled in ATP Draw. The generated earth fault is simulated, and the voltage and current signal produced is recorded. The earth fault location algorithm is simulated and tested in MATLAB. The accuracy of the earth fault location algorithm is tested at several locations and fault resistances. A possible correction technique is explained to minimize the error. The results show an improvement fault location distance estimation with minimum error.

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Aizenberg, Igor, Riccardo Belardi, Marco Bindi, Francesco Grasso, Stefano Manetti, Antonio Luchetta, and Maria Cristina Piccirilli. "Failure Prevention and Malfunction Localization in Underground Medium Voltage Cables." Energies 14, no. 1 (December 25, 2020): 85. http://dx.doi.org/10.3390/en14010085.

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A smart monitoring system capable of detecting and classifying the health conditions of MV (Medium Voltage) underground cables is presented in this work. Using the analysis technique proposed here, it is possible to prevent the occurrence of catastrophic failures in medium voltage underground lines, for which it is generally difficult to realize maintenance operations and carry out punctual inspections. This prognostic method is based on Frequency Response Analysis (FRA) and can be used online during normal network operation, resulting in a minimally invasive tool. In order to obtain the good results shown in the simulation section, it is necessary to develop a lamped equivalent circuit of the network branch under consideration. The standard π-model is used in this paper to analyse sections of a medium voltage cable and the parameter variations with temperature are used to classify the state of health of the line. In fact, the variation of the electrical parameters produces a corresponding variation in the frequency response. The proposed system is based on the use of a complex neural network with feedforward architecture. It processes the frequency response, allowing the classification of the cable conditions with an accuracy higher than 90%.

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Pijarski, Paweł, and Piotr Kacejko. "Voltage Optimization in MV Network with Distributed Generation Using Power Consumption Control in Electrolysis Installations." Energies 14, no. 4 (February 14, 2021): 993. http://dx.doi.org/10.3390/en14040993.

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Connecting a large number of distributed sources to the medium and low voltage grid poses many problems. The most important of these are the voltage changes inside the network, what can be observed when the power flow from these sources towards the HV/MV (High Voltage/Medium Voltage) transformer station. In particular, if the power consumption in nodes of the MV network is small and the distance between the place of installation of the source and the substation is large, increases and changes in voltage may be dangerous for the insulation of the network and burdensome for the consumers connected to it. The solution most frequently used to control voltage increases is the appropriate setting of the controller that affects the on-load tap changer of the MV/HV or even MV/LV (Medium Voltage/Low Voltage) transformer. It is also possible to regulate the reactive power of the sources and, of course, to limit their generated active power (curtailment of generation). The development of energy storage technology has made it possible to introduce consumers into the network, whose power can be controlled in a wide range. The article proposes the concept of an innovative voltage control system in the MV network, whose output values are three groups of parameters: HV/MV transformer ratio, reactive power of sources and active power of consumers connected in generation nodes. In the technological sense, it has been assumed that the loads are installations of electrolyzers used to produce “green hydrogen”, according to the P2G (Power to Gas) formula. The tests consisting in the execution of several hundred calculation cycles for the IEEE 37 test network, using the Monte Carlo simulation, have shown that the subordination of the hydrogen production process to the objectives of voltage control in the MV network clearly contributes to stabilizing its value, while meeting the technological requirements. The control variables of the proposed control system are the result of the optimization algorithm described in the article, the function of which is the quality of network voltage.

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Rasyid, Ramly. "EVALUASI JARINGAN TENGANGAN MENENGAH PASCA BENCANA DI KABUPATEN HALMAHERA SELATAN." Patria Artha Technological Journal 4, no. 2 (October 31, 2020): 91–100. http://dx.doi.org/10.33857/patj.v4i2.355.

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This study looked at the condition of power loss and falling voltage after the evaluation of the medium voltage network 20 kV after the earthquake disaster in South Halmahera district, especially in labuha extension on Bacan island The method used in this study is a quantitative research method with data collection done which is then simulated using ETAP 12.6 software. The simulation result obtained total power loss at Labuha extension is 44.3 kW + 66.8 kVAR or 80,154 kVA of 2,445 MVA delivery power, while the presentation of power loss is 3.278%, this is still considered feasible because the power loss on the medium voltage network 20 kV is 10% while in Labuha turtles the power loss is less than 10%. While the large fall in voltage at the largest Labuha extension at the Belang-Belang distribution substation is 3.96% or 792 volts, this is due to the channel length and presentation of the load reaching 83% against the distribution tranformator and the fall in the average voltage of Labuha's purgator is 3.025% or 605 volts against the nominal voltage of 20 kV. It is still considered viable for operation due to the permitted voltage fall on the 20 kV medium voltage network which is 5%.

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Journal articles on the topic 'Medium Voltage Network'

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