scholarly journals DEVELOPMENT OF AN ALGORITHM FOR CREATING A THREE-DIMENSIONAL GRAPH OF THE TOTAL HARMONIC OF VOLTAGE COMPONENTS RATIO

2021 ◽  
pp. 56-67
Author(s):  
Nadezhda M. Drey ◽  
Ayrat G. Ziganshin ◽  
Georgi M. Mikheev
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Short Circuit ◽  
Three Dimensional ◽  
Supply System ◽  
Electrical Network ◽  
Industrial Enterprises ◽  
Harmonic Components ◽  
Dimensional Graph

In the power supply system of industrial enterprises with low installed capacity, a battery of cosine capacitors is used as reactive power compensation devices in most cases. However, in certain modes of operation in such a network due to the presence of electrical receivers, which generate the highest harmonics, there may be resonance phenomena. Therefore, in such a network you should know both the presence of harmonic components and their percentage. It is known that according to GOST 32144-2013 it is necessary to take into account not only the individual harmonic components of the voltage of about 40 harmonics, but also the total ratio of these components. For this reason, the calculation of this parameter in the power supply system of consumers is an urgent task. In this paper the principle of structure of the three-dimensional graph of the total factor of harmonic components of voltage is revealed. The arguments for the dependence of this factor on the most important parameters of the electrical network, such as system short-circuit power, capacitor bank, load consumption are given. The authors have developed an algorithm for creating a three-dimensional graph of the total harmonic voltage components coefficient with the disclosure of the principles of its construction. As an example, the paper presents graphical dependencies: kU = f(SКZ , QBK ); kU = f(SКZ , PNG ); kU = f(QBK , PNG).

scholarly journals MODERN METHODS OF REACTIVE POWER COMPENSATION IN PETROCHEMICAL PRODUCTION

2022 ◽  
Vol 1 (15) ◽  
pp. 22-28
Author(s):  
Igor' Golovanov ◽  
Alena Alekseeva ◽  
Vladimir Proskuryakov ◽  
Roman Samchuk
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Supply System ◽  
Petrochemical Production ◽  
Oil Refineries ◽  
Compensation Systems ◽  
Thyristor Control ◽  
Control Circuits

Electrical circuits of reactive power compensation on the basis of thyristor control circuits in the power supply system of oil refineries are considered. The main advantages, advantages over traditional reactive power compensation systems and directions of introduction into the power supply system of modern production are formulated.

scholarly journals Development and simulation of the Institute of ionosphere measuring complex energy consumption

2020 ◽  
Vol 2 (58) ◽  
pp. 28-32
Author(s):  
A. Gapon ◽  
O. Grib ◽  
S. Kozlov ◽  
O. Yevseienko ◽  
O. Levon
Keyword(s):  
Energy Consumption ◽  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Supply System ◽  
Stable Operation ◽  
Ministry Of Education ◽  
National Academy Of Sciences ◽  
Measuring Complex ◽  
Consumption System

The work is devoted to solving an urgent problem - the development of a computer model of the energy consumption system of the Institute of the ionosphere of the National Academy of Sciences and the Ministry of Education and Science of Ukraine in order to solve the problem of increasing the energy efficiency of the measuring complex. The power supply system of the complex is described, a generalized structural diagram of the loads - powerful consumers of electricity is presented. The graphs characterizing the energy consumption of individual powerful loads are presented, the problem of compensating the reactive power of loads is shown. The adequacy of the developed model is confirmed by the coincidence of the shape and values of the experimentally obtained characteristics on loads with the characteristics of the model. The model adequacy was assessed by the variance of feedback deviations from the system mean. The results obtained confirmed the possibility of using the developed Matlab-model of the energy consumption system of the measuring complex for creating and testing on the model of an energy-efficient power supply system, which will ensure the stable operation of scientific equipment for the implementation of research programs of the NAS of Ukraine.

Research on the SVC Auto-Compensating Method Based on the Variable Reactor

2013 ◽  
Vol 321-324 ◽  
pp. 1414-1417 ◽  
Author(s):  
Jing Chen ◽  
Qi Jian Cheng ◽  
You Xin Yuan ◽  
Wei Yang
Keyword(s):  
Working Conditions ◽  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Theoretical Foundation ◽  
Industrial Applications ◽  
Reactive Power Compensation ◽  
Supply System ◽  
Compensation Method ◽  
Secondary Side

The objective of this work is to research on a SVC auto-compensation method to improve the power factor of the power supply system. Firstly, the principles of the reactive power compensation of FC+TCR are analyzed qualitatively. According to the deficiencies of this compensator, a novel SVC auto-compensating method based on the variable reactor is presented. The reactor controlled by anti-parallel thyristors is namely as the variable reactor in this method. The secondary-side equivalent inductance of the variable reactor is varied by adjusting the SCR firing angles. And then, the equivalent inductance of the variable reactor of the compensator branch is adjusted indirectly for compensating the corresponding reactive power after the working conditions of the load are changed. Therefore, the auto-compensating of this var compensator is realized. The auto-compensating principles of this compensator have been analyzed, and a research on the compensating parameters of this compensator is given emphatically in this paper. Finally, the essential operation steps of this SVC compensation method are given. The research of this paper has laid a theoretical foundation for this compensator in industrial applications.

Transient Responses in Continuous Co-Phase Traction Power Supply System

2014 ◽  
Vol 1006-1007 ◽  
pp. 955-961
Author(s):  
Xing Wang Li ◽  
Ju Rui Yang
Keyword(s):  
Contact Line ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Supply System ◽  
Transient Responses ◽  
Traction Substation ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Traction Power

Continuous co-phase traction power supply system is the major change of the traction power supply. It is important to analyze the transient response characteristics of overhead contact line for the traction substation feeder protection. This article introduces the main structure of continuous co-phase traction power supply system and the control strategy of traction substation. Meanwhile, transient responses of overhead contact line in the earth short circuit are studied, including metallic earth short circuit and non-metallic earth short circuit (high resistance ground). In the PSCAD/EMTDC electromagnetic transient simulation environment, the effects on the system and the recovery process are studied which the fault occurred in the output interface of traction substation and occurred in overhead contact line.

scholarly journals An Efficient Hybrid AC Metro Power Supply System Integrating PV With Grid

2019 ◽  
pp. 314-321
Author(s):  
J. Prince Joshua Gladson ◽  
A. Ravielango
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Reactive Power ◽  
Control Method ◽  
Electrical Energy ◽  
Supply System ◽  
Urban Rail Transit ◽  
Traction Power Supply System ◽  
Traction Power Supply ◽  
Photovoltaic Plants

Metro is integral to the urban rail transit with the expansion of the city. Due to the tremendous power consuming of the traction load which is generally considered to be megawatt class, the attendant problems concerning energy-saving and emission-reduction cannot be neglected. An approach wherein the photovoltaic plants are connected into the metro traction power supply system to provide electrical energy is proposed in this paper. Given the deterioration of power quality brought about by PV connection, the photovoltaic inverter adopts output reactive power control method.

scholarly journals Choosing the type of equivalent circuit of traction substation when calculating short-circuit currents in 25 kV power supply system

2020 ◽  
Vol 79 (3) ◽  
pp. 139-144
Author(s):  
E. P. Figurnov ◽  
Yu. I. Zharkov ◽  
N. A. Popova
Keyword(s):  
Equivalent Circuit ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Supply System ◽  
The Other ◽  
Equivalent Circuits ◽  
Traction Substation ◽  
Traction Network ◽  
Short Circuit Currents

When calculating short circuit currents in the traction network, it is necessary to take into account the input resistance of the traction substation, including the resistance of the transformers of the substation and the resistance of the power supply system. The input resistance during short circuit is determined based on the equivalent circuit of the external power supply system, of which this traction substation is an integral part. Traditionally equivalent circuit of a three-phase system has the form of a star, in which the resulting resistances in each phase are connected in series with a source of phase electromotive force, and these sources have a common point. Another equivalent circuit in the form of a triangle is possible, in which on each side the resulting resistances are connected in series with the source of linear electromotive force. It is important to note that neither one nor the other type of equivalent circuit is determined by the connection scheme of the transformer windings of the traction substation. It is only necessary to take into account the absence of a circuit for zero sequence currents. All elements of the equivalent circuit, as is known, should be brought to uniform basic conditions. If the parameters of these elements are expressed in named units, then the basic values are the effective voltage values of the main stage and the rated power of the power transformer of the traction substation. If the components of one and the other equivalent circuits are reduced to one stage of the operating voltage, for example 27.5 kV, then for the same elements of the power supply system, the resistance values in the equivalent circuit in the form of a triangle are three times larger than in the equivalent circuit in the form of a star. In this case, the input resistances of the traction substation for the one and the other equivalent circuits are absolutely identical. Therefore, in the calculation of short circuit currents of the traction network, you can use any of these equivalent circuits of the power supply system and traction substation. Formulas for calculating the resistances of the elements of the power supply system and electrical installations, given in the standards, manuals and reference books, relate to the equivalent circuit of the short circuit in the form of a star. When using an equivalent circuit in the form of a triangle, these resistances must first be tripled, and then divided by three when calculating the short-circuit currents. The meaninglessness of such an operation is obvious. The equivalent circuit of the traction substation and the external power supply system in the form of a triangle when calculating short circuits in the traction network has no advantages compared to the traditional equivalent circuit in the form of a star. The information on the linear currents on the primary and secondary windings of the traction substation transformer during a short circuit in the traction network is given, which is necessary to select the settings of its relay protection kit.

scholarly journals Accounting power supply schemes for traction substations in the calculation of short circuits in the AC traction network

2019 ◽  
Vol 78 (1) ◽  
pp. 10-18 ◽  
Author(s):  
Yu. I. Zharkov ◽  
N. A. Popova ◽  
E. P. Figurnov
Keyword(s):  
High Voltage ◽  
Power Supply ◽  
Power Supply System ◽  
Short Circuit ◽  
Supply System ◽  
Power Sources ◽  
Traction Network ◽  
Traction Substations ◽  
External Power ◽  
External Power Supply

When calculating short-circuit currents in the AC traction network, it is assumed that each of the traction substations receives power from uncoupled external power supply sources with known resistances. In some cases, especially when powering a group of traction substations from a high-voltage power line of a longitudinal power supply, the external power supply system affects not only the magnitude of short-circuit currents, but also their redistribution between adjacent traction substations of the interstation area where this circuit is considered. Such unrecorded redistribution can have a negative effect on short circuit protection. The article considers the equivalent circuit of the traction network, taking into account resistance of the external power supply system. Particular attention is paid to the fact that in replacement circuits of direct and negative sequence value of reduced resistance of one phase of a multiwinding transformer, calculated from the short circuit voltage, does not depend on the connection scheme of its windings. It is noted that in some cases it is difficult to obtain a complete scheme of an external power supply system. Considering that the short circuit in the traction network for the external power supply system is remote, it is proposed taking into account the reference network or traction substations as power sources, from which high-voltage transmission lines power the traction substations. Resistance of the supporting substations as power sources must takes into account connected equivalent power system.Such equivalenting should be carried out by known values of currents or short-circuit powers at the inputs of the reference substation or, if such information is not available, by the rated values of the switched-off currents or powers of the switches of high-voltage line connections.The following power schemes for traction substations are considered: each from its own supporting substation, which is part of an electrically uncoupled external power supply system; from the double-circuit high-voltage line of longitudinal power supply when it is powered from different supporting substations; from the supporting network substation, the traction substation receives power from two lines, and from this the traction substations receive power from two lines in a circle pattern.These three common cases cover all the most common power schemes for traction substations. For each of them formulas are given to determine the resulting equivalent resistance of the external power supply circuit, which should be taken into account in the replacement circuit of the traction network.

scholarly journals Swarm algorithms in dynamic optimization problem of reactive power compensation units control

2019 ◽  
Vol 9 (5) ◽  
pp. 3967
Author(s):  
V.Z Manusov ◽  
P.V. Matrenin ◽  
N. Khasanzoda
Keyword(s):  
Dynamic Optimization ◽  
Power Supply ◽  
Optimization Problem ◽  
Power Supply System ◽  
Reactive Power ◽  
Reactive Power Compensation ◽  
Supply System ◽  
Bees Algorithm ◽  
Dynamic Optimization Problem ◽  
Engineering Research

Optimization of a power supply system is one of the main directions in power engineering research. The reactive power compensation reduces active power losses in transmission lines. In general, researches devoted to allocation and control of the compensation units consider this issue as a static optimization problem. However, it is dynamic and stochastic optimization problem that requires a real-time solution. To solve the dynamic optimization NP-hard problem, it is advisable to use Swarm Intelligence. This research deals with the problem of the compensation units power control as a dynamic optimization problem, considering the possible stochastic failures of the compensation units. The Particle Swarm Optimization and the Bees Algorithm were applied to solve it to compare the effectiveness of these algorithms in the dynamic optimization of a power supply system.

scholarly journals O uso de maquetes físicas no processo de ensino e aprendizagem

2020 ◽  
Vol 42 ◽  
pp. 32
Author(s):  
Fernanda Marques Gonçalves ◽  
Henrique Sanches Barbosa de Oliveira ◽  
Letícia Laureano Xavier de Moura ◽  
Vanessa Virginia Silva ◽  
Sabine Ritter De Paris ◽  
...  
Keyword(s):  
Experimental Method ◽  
Power Supply ◽  
Power Supply System ◽  
Three Dimensional ◽  
Research Synthesis ◽  
Academic Community ◽  
Supply System ◽  
Automation System ◽  
Single Family ◽  
Three Dimensional Models

Three-dimensional models complement the representation of a study object and serve as a research synthesis. Aiming to supplement the formation of the academic community, the META group was created, which, through the use of modeling as an experimental method, addresses the subjects of the courses on campus. The aim of this paper is to present the results obtained from the second semester of 2018 to date, namely two prototypes: a single-family residence with automation system and a prototype rail system for the insertion of a Bluetooth power supply system.

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