scholarly journals CLASSIFICATION OF POWER NETWORK ELEMENTS ON RELIABILITY-RELATED ASPECTS IN THE ASTRAKHAN REGION (ON THE EXAMPLE OF “ASTRAKHANENERGO” - A BRANCH OF PJSC “IDNC OF THE SOUTH”)

2019 ◽  
pp. 48-56
Author(s):  
Aislu Muratovna Kubenova ◽  
Sergey Vladimirovich Golovko
Keyword(s):  
Power Supply ◽  
Large Scale ◽  
Network Reliability ◽  
Electric Energy ◽  
Poor Quality ◽  
Power Grids ◽  
Electrical Network ◽  
The South ◽  
Electric Networks ◽  
Voltage Loss

Distribution electric networks are an important link in the system of production, transmission and consumption of electric energy. The precise configuration and setting up the relay protection and emergency automation devices, including the right choice of the device working parameters, are of great importance for the reliable operation of power grids. Problems with power supply may appear either as poor quality of electricity supply (instability or distortion of voltage, its frequency fluctuation, low capacity of the power grid), or as its unreliability voltage loss. Recently, in the Astrakhan region there has been recorded an increase of electrical loads due to the growing number of enterprises and energy supply building in industry and household. The search for variants with reduced capital investments in the process of the large-scale and expensive energy construction, as well as the selection of simple and relevant proposals for the development and elaborating power supply systems are important issues for designing power lines. The analysis of the electrical network reliability factors of “Astrakhanenergo”, the branch of “IDGC of the South”, PJSC has been done.

Study of power transformer loading in rural power supply systems

2021 ◽  
Vol 13 (4) ◽  
pp. 282-289
Author(s):  
I. V. Naumov ◽  
D. N. Karamov ◽  
A. N. Tretyakov ◽  
M. A. Yakupova ◽  
E. S. Fedorinovа
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Rural Areas ◽  
Power Transformer ◽  
Electric Energy ◽  
Power Transformers ◽  
Electric Networks ◽  
Load Factors ◽  
Optimal Load ◽  
Supply Systems

The purpose of this study is to study the effect of loading power transformers (PT) in their continuous use on their energy efficiency on a real-life example of existing rural electric networks. It is noted that the vast majority of PT in rural areas have a very low load factor, which leads to an increase in specific losses of electric energy when this is transmitted to various consumers. It is planned to optimize the existing synchronized power supply systems in rural areas by creating new power supply projects in such a way as to integrate existing power sources and ensure the most efficient loading of power transformers for the subsequent transfer of these systems to isolated ones that receive power from distributed generation facilities. As an example, we use data from an electric grid company on loading power transformers in one of the districts of the Irkutsk region. Issues related to the determination of electric energy losses in rural PT at different numerical values of their load factors are considered. A computing device was developed using modern programming tools in the MATLAB system, which has been used to calculate and plot the dependence of power losses in transformers of various capacities on the actual and recommended load factors, as well as the dependence of specific losses during the transit of 1 kVA of power through a power transformer at the actual, recommended and optimal load factors. The analysis of specific losses of electric energy at the actual, recommended and optimal load factors of PT is made. Based on the analysis, the intervals of optimal load factors for different rated power of PT of rural distribution electric networks are proposed. It is noted that to increase the energy efficiency of PT, it is necessary to reduce idling losses by increasing the load of these transformers, which can be achieved by reducing the number of transformers while changing the configuration of 0.38 kV distribution networks.

scholarly journals Features of calculations of consequences of failures of power supply in distribution networks with the monoconsumer of electric energy

2020 ◽  
Vol 22 (2) ◽  
pp. 43-50
Author(s):  
Y. A. Sekretarev ◽  
D. A. Menyaikin
Keyword(s):  
Power Supply ◽  
Electric Energy ◽  
Distribution Networks ◽  
Operating Conditions ◽  
Electric Networks ◽  
Use Of Data ◽  
Information Classification ◽  
Specific Scheme ◽  
Transmission And Distribution

Reliability of power supply of consumers is an important task in the process of transmission and distribution of electric energy. The paper proposes a method for assessing the consequences of power failures of monoconsumers of electric energy on the example of an oil company and an adjacent power grid company. The uniqueness of the developed technique lies in the possibility of reliable calculation of reliability of power supply of complex branched electric networks without taking into account the specific scheme of power supply. The accuracy of calculations is increased due to the use of data directly studied power system, taking into account the specifics and operating conditions of specific equipment, instead of the average information. Classification of failures on the main reasons in electric networks of the oilproducing enterprise of the far North that allowed to develop actions for increase of level of reliability of power supply is made.

scholarly journals Electric network topology and method of transmission of electric energy

2019 ◽  
Vol 21 (4) ◽  
pp. 95-103
Author(s):  
N. I. Smolentsev ◽  
L. M. Chetoshnikova
Keyword(s):  
Energy Storage ◽  
Network Topology ◽  
Information Technologies ◽  
Electric Energy ◽  
Electrical Energy ◽  
Electrical Network ◽  
Energy Storage Devices ◽  
Electric Networks ◽  
Storage Devices ◽  
Asynchronous Method

The purpose of the work is to reduce losses and increase energy saving in electric networks. To achieve this goal, a multilevel topology of the electrical network and an asynchronous method for transferring electrical energy between nodes including a load, energy sources, energy storage devices connected in an appropriate manner are proposed. It is shown by the mathematical method that this network topology allows using energy storage devices controlled appropriately and using tele-information technologies to optimize the balance of electric energy in the network, achieving equality of the generated and consumed electricity. Such a network topology and a method of transmitting electrical energy can be the basis of digital technologies in the energy sector (ENERNET).

scholarly journals Enhancing safety and reliability of electric power supply to consumers through safe electricity networks of up to 1 kV

2021 ◽  
Vol 7 (2) ◽  
pp. 97-102
Author(s):  
Yurii Shelekh ◽  
◽  
Myroslav Sabat ◽  
Vladyslav Lysiak ◽  
Lidija Parashchuk ◽  
...  
Keyword(s):  
Power Supply ◽  
Electric Energy ◽  
Electrical Network ◽  
Electrical Safety ◽  
Technical Solution ◽  
Additional Advantage ◽  
Electric Power Supply ◽  
Safety And Reliability ◽  
Emergency Mode ◽  
Electrical Installation

The study presents an electric network that allows both increasing the level of electrical safety and eliminating one-phase damage to the electrical network without switching off the consumer's electric energy. The application of the network does not require significant investments. The technical feasibility of implementing an electrical installation with voltage values in the emergency mode on the leading parts, which does not exceed the permissible values for normal mode, is demonstrated. An additional advantage of the proposed technical solution is the immutability of the voltage at the customer's outputs, which allows it to operate normally also in the emergency mode of the electrical installation.

Optimization of Sectionalization Parameters of Distributive Electric Networks

2020 ◽  
pp. 78-105 ◽  
Author(s):  
Kozyrskyi Volodymyr ◽  
Gai Oleksandr ◽  
Sinyavsky Oleksandr ◽  
Vitaliy Savchenko ◽  
Makarevich Svitlana
Keyword(s):  
Mathematical Model ◽  
Cost Effectiveness ◽  
Power Supply ◽  
Optimization Problem ◽  
Supply System ◽  
Electrical Network ◽  
Electric Networks ◽  
Economic Criterion ◽  
The Cost ◽  
Switching Devices

The reliability of electrical consumers depends on the presence of sectioning devices in electrical network distribution. Determining the number and installation sites of sectioning machines is an important optimization problem, based on a comparison of the cost of installing devices and reducing the damage to consumers from an undersupply of electricity. A mathematical model is proposed to determine the cost-effectiveness of installing partitioning switching devices for networks with a means of increasing reliability. This allows for the choice when installing switching devices not only meets an economic criterion (in the form of reducing damage to the power supply system as a whole), but also takes into account the change in the duration of downtime of local consumers.

Time Factor for Determination of Power Supply System Efficiency of Rural Consumers

2018 ◽  
pp. 394-420 ◽  
Author(s):  
Alexander Vinogradov ◽  
Alexey Vasiliev ◽  
Vadim Bolshev ◽  
Alexander Semenov ◽  
Maksim Borodin
Keyword(s):  
Mathematical Model ◽  
Power Supply ◽  
Power Supply System ◽  
Technical Condition ◽  
Supply System ◽  
Electrical Network ◽  
Electricity Supply ◽  
System Efficiency ◽  
Electric Networks ◽  
Rural Consumers

This chapter proposes the interpretation of the concept of “power supply system efficiency” and a mathematical model that focuses on minimization of electricity supply expenses while observing the time criteria. The research examines the constituents of the specified time criteria, the calculations of power outage time, and the time of power supply restoration. In addition, this chapter describes the constituents of implementation time for a technological connection of rural consumers to electric networks and the statistical data on the time of inconsistency between power quality and regulatory requirements. Furthermore, this chapter investigates the applying possibility of the proposed mathematical model for the development of measures that can improve power supply system efficiency. In order to improve electricity supply reliability of rural consumers, the technical condition monitoring of power lines and electrical network automation is carried out.

scholarly journals PMSG-Based Black-Start Technology and Its Field Tests

Energies ◽  
2019 ◽  
Vol 12 (11) ◽  
pp. 2144
Author(s):  
Min-gang Tan ◽  
Yi Tang ◽  
Chaohai Zhang
Keyword(s):  
Field Test ◽  
Power Supply ◽  
Large Scale ◽  
Wind Farm ◽  
Thermal Power ◽  
Wind Farms ◽  
Power Grids ◽  
Diesel Generator ◽  
Supply Source ◽  
Power Supply Source

It is of great importance for power grids to have black-start capability for rapid recovery, and there is great theoretical significance and practical application value in studying how to use wind farms as the black-start power supply source for power grids with large-scale renewable energy generation. In this paper, a black-start scheme using a permanent-magnet synchronous generator (PMSG)-based wind farm as black-start power supply source is formulated. First, a diesel generator is used as an external supporting power supply for the self-start of a wind power unit (WPU). Then, after all the planned WPUs operate normally, the wind farm with the diesel generator and static var generator (SVG) is used to black start the simulated auxiliary load of a thermal power plant. A field test of the proposed black-start scheme is carried out on an actual wind farm in Jiangsu Province (China). The results of the field test show that wind farms can act as a black-start power supply source for the grid after appropriate technological transformation.

scholarly journals Analysis and research on optimal economic operation of cogeneration micro-grid based on heat pump control

2021 ◽  
Vol 25 (4 Part B) ◽  
pp. 2871-2879
Author(s):  
Wei Xia
Keyword(s):  
Objective Function ◽  
Power Supply ◽  
Large Scale ◽  
Power Grids ◽  
Economic Optimization ◽  
Operating Characteristics ◽  
Analytic Hierarchy ◽  
Large Power ◽  
Power Exchange ◽  
Micro Grid

When the micro-grid is connected to the grid, the influence of the load and the micropower supply?s operating characteristics may cause the power exchange between the micro-grid and the large grid to cause unnecessary losses. The objective function of power supply satisfaction of large power grids. The article takes the co?generation micro-grid as the research object. It proposes establishing an objective function including the satisfaction of micro-grid decision-makers, the satisfaction of social benefits, and the satisfaction of large-scale power supply using the analytic hierarchy process. After that, the article uses the particle swarm optimization algorithm combined with the typical dispatching strategy of the micro-grid to solve the aforementioned model with MATLas the primary tool, and obtains the 24 hour output optimization results of the micro-grid, and analyzes the results in detail. The calculation examples show that the model can achieve economic optimization based on satisfying the satisfaction of different groups, which verifies the scientificity and effectiveness of the proposed model.

ELECTROMAGNETIC COMPATIBILITY OF LOW-POWER AUTONOMOUS POWER SUPPLY EQUIPMENT

2020 ◽  
Author(s):  
V.N. Delyagin ◽  
◽  
V.I. Bocharov ◽  
Keyword(s):  
Low Power ◽  
Power Supply ◽  
Electromagnetic Compatibility ◽  
Autonomous Systems ◽  
Electric Energy ◽  
Electrical Energy ◽  
Electrical Equipment ◽  
Electrical Network ◽  
Nonlinear Load ◽  
Harmonic Components

The article presents the results of research on the evaluation of electromagnetic compatibility of elements of the power supply system for Autonomous low-power consumers. The subject of the study is a quantitative assessment of the level of harmonic components of currents and voltages in systems: a permanent magnet generator-a DC-to-AC Converter-a consumer with a nonlinear load and interfering interaction of jointly working elements of this system. The level of harmonics of voltage and current in the local electrical network (farm), repeatedly (from 3 to 10 times) exceeds the regulatory requirements. The multiplicity of the increase in electrical energy losses (K-Factor) is from 5("pure" sine of the DC-AC Converter) to 20 (rectangular meander). When designing Autonomous systems, it is necessary to provide measures to reduce the loss of electrical energy, exit from standing electrical equipment and false triggering of electronic devices in the consumer of electric energy

scholarly journals Analysis of causes of failures in 10 kV electrical power distribution networks (on the example of the Southern electrical networks of the city of Irkutsk)

2019 ◽  
Vol 11 (4) ◽  
pp. 299-304
Author(s):  
I. V. Naumov ◽  
E. V. Karpova
Keyword(s):  
Power Supply ◽  
Power Distribution ◽  
Large Scale ◽  
Electrical Power ◽  
Electric Energy ◽  
Distribution Networks ◽  
Economic Damage ◽  
Left Bank ◽  
Electrical Networks ◽  
Wide Range

Disconnection of power consumers from power grids is quite a common event, with a wide range of consequences. Power supply interruptions can be caused by both casual events, and planned shutdowns. Disruptions in systems of power supply of consumers lead to a variety of adverse events (under-delivery of products, large-scale product rejection, failure of production equipment, etc.), which inflicts a significant economic damage. The retrospective analysis of the failure rate of electrical networks of the Right Bank and Left Bank districts of Irkutsk over 2013–2017 has been carried out. The analysis was based on the data from dispatching logs of observations on events of failures caused by emergency damage to the Southern electrical networks. It is established that the greatest number of failures occurs for such reasons as damage at substations, damage to consumer electrical networks, wire breakage in air and cable power lines as well as damage of switching equipment. Failures related to wind load, damage at packaged transformer substations, insulators and surge arresters are also analysed. The percentage rate of failures of electrical power networks caused by specific reasons from the total number of failures is presented. Besides, the analysis is performed of the duration of interruptions of power supply owing to damage of individual elements of power network equipment as well as the amount of electric energy undelivered for these reasons, and financial losses caused by these failures due to under-delivery of electric energy, with the average wholesale electricity prices taken into account.

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