scholarly journals Ensuring an effective voltage regime in the electrical network when powering ships of the technical fleet and floating objects from the shore

2021 ◽  
Vol 2131 (5) ◽  
pp. 052047
Author(s):  
Y Denchik ◽  
E Ivanova ◽  
V Salnikov ◽  
S Gorelov ◽  
D Zubanov
Keyword(s):  
Electromagnetic Compatibility ◽  
Power Transmission ◽  
Low Frequency ◽  
Electrical Network ◽  
Electromagnetic Disturbance ◽  
Electrical Networks ◽  
Reverse Sequence ◽  
Effective Voltage ◽  
Automated Determination

Abstract The article deals with topical issues of reducing the asymmetry of linear voltages in the electrical networks of water transport enterprises. Asymmetric modes in the electrical network are researched, which defined the need for automated determination of conductive electromagnetic disturbance. A mathematical description of the occurrence process and strategy for determining the conductive low-frequency electromagnetic disturbance by the voltage asymmetry coefficient in the reverse sequence are presented. The parameters of this coefficient are described: mathematical expectation, standard deviation, probability of occurrence during the calculation period. A mathematical model is obtained that represents a conductive electromagnetic disturbance and explains the probability of its occurrence. A method of automated determination of conductive electromagnetic disturbance has been developed. A software product is presented (certificate of registration No. 2016661752), which allows processing the voltage coefficients obtained as a result of measurements in the reverse sequence. The conductive disturbance is determined for the purpose of suppression and ensuring electromagnetic compatibility. To ensure an effective mode by powering ships from the shore and to increase the efficiency of power transmission, a strategy for voltage symmetry in the electrical network is presented.

scholarly journals Calculations, norming and reducing of electrical energy losses in city electrical networks

2019 ◽  
Vol 21 (3) ◽  
pp. 46-54
Author(s):  
A. V. Lykin ◽  
E. A. Utkin
Keyword(s):  
High Voltage ◽  
Power Transmission ◽  
Low Voltage ◽  
Demand Curve ◽  
Electrical Energy ◽  
Electrical Network ◽  
Energy Losses ◽  
Capital Investments ◽  
Electrical Networks

The article considers the feasibility of changing the structure of a distribution electrical network by transferring points of electricity transformation as close to consumers as possible. This approach is based on installation of pole-mounted transformer substations (PMTS) near consumer groups and changes the topology of the electrical network. At the same time, for groups of consumers, the configuration of sections of the low-voltage network, including service drops, changes. The efficiency of approaching transformer substations to consumers was estimated by the reduction in electrical energy losses due to the expansion of the high-voltage network. The calculation of electrical losses was carried out according to twenty-four hour consumer demand curve. To estimate the power losses in each section of the electrical network of high and low voltage, the calculated expressions were obtained. For the considered example, the electrical energy losses in the whole network with a modified topology is reduced by about two times, while in a high-voltage network with the same transmitted power, the losses are reduced to a practically insignificant level, and in installed PMTS transformers they increase mainly due to the rise in total idle losses. The payback period of additional capital investments in option with modified topology will be significantly greater if payback is assessed only by saving losses cost. Consequently, the determination of the feasibility of applying this approach should be carried out taking into account such factors as increasing the reliability of electricity supply, improving the quality of electricity, and increasing the power transmission capacity of the main part of electrical network.

scholarly journals Line voltage asymmetry in closed electrical networks with distributed generation as a source of electromagnetic interference

2021 ◽  
Vol 2131 (5) ◽  
pp. 052004
Author(s):  
A Antonov ◽  
D Ivanov ◽  
Y Denchik ◽  
E Ivanova ◽  
M Ivanov ◽  
...  
Keyword(s):  
Distributed Generation ◽  
Electromagnetic Interference ◽  
Electromagnetic Compatibility ◽  
Low Frequency ◽  
Electrical Network ◽  
Technical Equipment ◽  
Electrical Networks ◽  
Electronic Resource ◽  
Voltage Unbalance ◽  
State Registration

Abstract The article reveals relevance of the problem of unbalance of line voltages in closed electrical networks with distributed generation as a source of electromagnetic interference, in particular, the problem of electromagnetic compatibility of coastal and ship technical equipment. There is presented mathematical description of the process of occurrence of conductive low-frequency EMF by the voltage unbalance coefficient in the reverse sequence and an algorithm for finding it; using the equations, parameters of this coefficient are described, such as mathematical expectation, standard deviation, probability of occurrence for the billing period, as a result, a computer program has been developed to calculate these parameters; a method for processing the obtained data of power quality indicators according to the found coefficient has been developed; an algorithm for balancing voltages in an electrical network based on finding the most optimal power supply scheme for end consumers (certificate of state registration of an electronic resource No. 23664).

scholarly journals Expected electromagnetic environment at the energy infrastructure facilities of remote ports (berths)

2021 ◽  
Vol 2131 (5) ◽  
pp. 052048
Author(s):  
Y M Denchik ◽  
E V Ivanova ◽  
M N Ivanova ◽  
V G Salnikov ◽  
D A Zubanov
Keyword(s):  
Electromagnetic Compatibility ◽  
Block Diagram ◽  
Low Frequency ◽  
Electrical Network ◽  
Electromagnetic Disturbance ◽  
Electromagnetic Environment ◽  
Voltage Change ◽  
Distribution Parameters ◽  
Voltage Deviation ◽  
Floating Objects

Abstract The article deals with the issues of electromagnetic compatibility of coastal and floating objects in the waters of ports (berths). The subject of the study is the processes occurring in the electrical network when powering ships of the technical fleet and floating objects from the shore, which determine the need for automated calculation of conductive low-frequency electromagnetic disturbance for their subsequent suppression. An algorithm for calculating the parameters of the electromagnetic environment is presented, which is based on the analysis of the distribution parameters of slow voltage changes. The mechanism of EMD occurrence in voltage deviation is described and a mathematical model explaining the probability of its occurrence is presented. An algorithm for calculating the parameters of the electromagnetic environment based on slow voltage changes in the network is compiled. This algorithm is implemented in the “Program for the study of slow voltage changes by the load changingof the electrical network ". For the object under study, the parameters of the distribution of conductive low-frequency electromagnetic disturbance over a slow voltage change are determined. A block diagram of an automatic voltage regulator implementing the proposed voltage stabilization law has been developed.

scholarly journals Timely determination of static stability margins in power supply systems equipped with distributed generation installations

2021 ◽  
Vol 25 (1) ◽  
pp. 31-43
Author(s):  
Yu. N. Bulatov ◽  
A. V. Kryukov ◽  
К. V. Suslov ◽  
A. V. Cherepanov
Keyword(s):  
Distributed Generation ◽  
Power Supply ◽  
Computer Modelling ◽  
Dynamic Modelling ◽  
Electrical Network ◽  
Electrical Networks ◽  
Stability Margins ◽  
Emergency Control ◽  
Supply Systems

The article aims to develop a methodology to ensure timely determination of the margins of static aperiodic stability in power supply systems, at the nodal points of which distributed generation units are installed. The authors used mathematical methods and algorithms based on the application of limiting regime equations. Transitional processes were analysed for various points in the space of controlled mode parameters according to the simulation modelling in Matlab using the Simulink and SimPowerSystems packages. On the basis of the obtained results, an effective technique for analysing stability margins in electrical networks with distributed generation units was implemented. This method is applicable in design problems, as well as in operational and emergency control. The conducted theoretical analysis and computer modelling showed the effectiveness of the proposed methodology for calculating stability margins; the nondegeneracy of the Jacobi matrix of limiting regime equations at the solution point ensures the guaranteed reliability of the results. It was shown that an alternative approach to solving the problem of timely determination of aperiodic stability margins can be implemented on the basis of limiting regime equation with increased nonlinearity. Dynamic modelling of an electrical network with distributed generation units confirmed the correctness of determining the stability margins calculated using limiting regime equations. The developed technique can be recommended for practical use in the design of power supply systems or in operational control of synchronous generators. In particular, the presented methodology can be used to implement a multi-agent emergency control system for distributed generation installations located in generalpurpose distribution electrical networks. 

scholarly journals Effective mode of voltage in the electrical network when powering ships of the technical fleet and floating objects from the shore

2021 ◽  
Vol 2131 (5) ◽  
pp. 052005
Author(s):  
Y Denchik ◽  
D Zubanov ◽  
M Romanov
Keyword(s):  
Power Transmission ◽  
Experimental Studies ◽  
Voltage Regulation ◽  
Electrical Network ◽  
Negative Consequences ◽  
Electrical Networks ◽  
Complex Load ◽  
Floating Crane ◽  
Floating Objects ◽  
The Impact

Abstract The article discusses negative consequences of a decrease in the quality of electrical energy when feeding ship receivers of electricity from coastal sources, a method is proposed to ensure an effective voltage regime in the electrical network when feeding ships of technical fleet and floating objects from the coast. Definition of the equilibrium voltage mode at the “shore-to-ship” power supply scheme is given, the equivalent circuit of supply line (feeder) for the river fleet is developed, significant regulatory effects of the “shore-to-ship” power transmission elements are determined. Experimental studies of static characteristics of floating crane of R-99 project have been carried out. According to the results of the experiment, regulating effects on the voltage of the complex load of 0.4 kV of floating crane were determined. A calculation program for personal electronic computers has been compiled, which provides an assessment of the impact of voltage deviations in electrical networks when regulating the load. The law of voltage regulation in the “shore-to-ship” power transmission is proposed. An experimental verification of effectiveness of proposed regulation law was carried out while ensuring the equilibrium mode.

scholarly journals Study of statistical data on the composition of electric distribution networks on the example of a Kaluga region district

2020 ◽  
Vol 220 ◽  
pp. 01005
Author(s):  
V.E. Bolshev ◽  
A.V. Vinogradov ◽  
A.V. Vinogradova ◽  
A.V. Bukreev ◽  
S.R. Khasanov
Keyword(s):  
Transmission Lines ◽  
Power Transmission ◽  
Electric Energy ◽  
Direct Interaction ◽  
Distribution Networks ◽  
Electrical Network ◽  
Electrical Networks ◽  
Electrical Distribution ◽  
Electrical Distribution Networks ◽  
Kaluga Region

Sustainable operation of the power grid complex is impossible without reliable and high-quality operation of 10/0.4 kV electrical distribution networks, which are the final link in the system for providing consumers with electric energy and are in direct interaction with a specific consumer. The study of statistical information on the composition of distribution networks makes it possible to draw conclusions about electrical network state, to implement recommendations for their development and to compare distribution electrical networks in different regions. This information is especially relevant for analyzing the reliability of power supply to consumers connected to the considered electrical distribution networks. Such indicators of network structure as the length of electric transmission lines of different voltages and power transmission schemes are studied. It also analyzes the number of damages in networks, the causes of these damages, data on the time of planned and emergency outages. This paper considers the structure of 10/0.4 kV electrical distribution networks located on the territory of one of the districts of the Kaluga region. The sample for distribution networks was: 1190 overhead transmission lines and 536 transformer substations. Consumers in the district are 21671 subscribers of individuals and 1986 subscribers of legal entities, that is, a total of 23657 metering points. On the lines of 0.4 kV and 10 kV, the percentage of their isolated design was revealed. The share of single-transformer and two-transformer versions of transformer substations is analyzed.

scholarly journals Impact of static reactive power compensator (SVC) on the power grid

2020 ◽  
Vol 11 ◽  
pp. 96-104
Author(s):  
Abdelkader Rahmouni
Keyword(s):  
Control System ◽  
Electric Power ◽  
Reactive Power ◽  
Power Transmission ◽  
Voltage Regulation ◽  
Electrical Network ◽  
Transmission Network ◽  
Electrical Networks ◽  
Current Transmission ◽  
Reactive Power Compensator

The work presented in this paper is a contribution to the problem of controlling the reactive powers and the voltages in an electrical network. Among these control tools, the static reactive power compensator (SVC) has been chosen because of its simplicity of control. The SVC is among the FACTS 'Alternative Flexible Current Transmission Systems' devices that help to deal with problems encountered in the operation of electrical networks either in the distribution side or in the transport side. In this work, the SVC is used to control the reactive power and the voltage in an electric power transmission network. In order to improve its efficiency, three voltage regulation systems have been chosen in the control system of this compensator.

scholarly journals Analysis of the Power Supply Restoration Time after Failures in Power Transmission Lines

Energies ◽  
2020 ◽  
Vol 13 (11) ◽  
pp. 2736 ◽  
Author(s):  
Alexander Vinogradov ◽  
Vadim Bolshev ◽  
Alina Vinogradova ◽  
Michał Jasiński ◽  
Tomasz Sikorski ◽  
...  
Keyword(s):  
Transmission Lines ◽  
Power Supply ◽  
Power Transmission ◽  
Electrical Network ◽  
Power Transmission Lines ◽  
Electrical Networks ◽  
Distribution Grid ◽  
Time Intervals ◽  
Restoration Time ◽  
Information Recognition

This paper presents the analysis of power supply restoration time after failures occurring in power lines. It found that the power supply restoration time depends on several constituents, such as the time for obtaining information on failures, the time for information recognition, the time to repair failures, and the time for connection harmonization. All these constituents have been considered more specifically. The main constituents’ results values of the power supply restoration time were analyzed for the electrical networks of regional power supply company “Oreolenergo”, a branch of Interregional Distribution Grid Company (IDGC) of Center. The Delphi method was used for determining the time for obtaining information on failures as well as the time for information recognition. The method of mathematical statistics was used to determine the repair time. The determined power supply restoration time (5.28 h) is similar to statistical values of the examined power supply company (the deviation was equal to 9.9%). The technical means of electrical network automation capable of the reduction of the power supply restoration time have also been found. These means were classified according to the time intervals they shorten.

scholarly journals EVALUATION OF EFFICIENCY OF USE OF ENERGY STORAGE SYSTEM IN ELECTRIC NETWORKS

2021 ◽  
Vol 2021 (4) ◽  
pp. 44-54
Author(s):  
O.V. Kyrylenko ◽  
◽  
I.V. Blinov ◽  
E.V. Parus ◽  
I.V. Trach ◽  
...  
Keyword(s):  
Energy Storage ◽  
Annual Cost ◽  
Storage System ◽  
Target Function ◽  
Energy Storage System ◽  
Electrical Network ◽  
Electrical Networks ◽  
Electric Networks ◽  
Electricity Grid

Ways for the use of energy storage systems (ESS) in electrical networks are considered. The formalization of the general approach to solving the problems of efficient use of ESS in electrical networks is performed. The article shows the mathematical models for evaluating the effectiveness of using ESS and determination of the ESS optimal configuration, including regulation modes of electric networks. The operation of the electrical network with an connected group of four ESS is considered. The standard IEEE 33-node 12.6 kV network was used as a base model. A new target function has been proposed. This function is based on the benefit of installing the ESS and consists of the annual cost of buying / selling electricity by ESS, the annual cost of reducing active losses in the electricity grid due to the operation of the ESS and the corresponding investment costs. The results of optimization calculations using the proposed objective function are given. A comparative analysis of the obtained results was performed. The estimation of the components of the function of the benefit of using ESS under the condition of elimination of deviations of voltage levels in separate nodes of the electric network from the normalized values is performed. References 33, figures 2, tables 2.

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