scholarly journals SAIFI AND SAIDI INDICATIVE RELIABILITY FIGURES OF RURAL ELECTRIC NETWORKS WITH SMART ISLAND RECLOSERS

2019 ◽  
Vol 51 (3) ◽  
pp. 83-92
Author(s):  
L.P. Andrianova ◽  
◽  
V.Yu. Kabashov ◽  
D.S. Khairislamov ◽  
◽  
...  
Keyword(s):  
Distribution Networks ◽  
Network Reconstruction ◽  
Optimal Number ◽  
Electrical Network ◽  
Annual Number ◽  
Investment Efficiency ◽  
Electric Networks ◽  
New Consumer ◽  
Annual Duration ◽  
Responsible Consumer

The paper describes principles of improving the reliability of rural distribution networks of 6–35 kV based on smart switching devices, reclosers with specialized integrated controllers. The typical places to install reclosers for the radial and ring feeders are shown. They are mounted when a new consumer is connected and balance membership is delimited. It is also done to identify a responsible consumer with an indicated connection diagrams. The choice of the optimal number of reclosers for the radial and ring feeders according to indicative figures RNRE and ARAE, characterizing the relative efficiency of network reconstruction by reducing the number of consumer outages per year, and the average investment efficiency in network reconstruction when installing reclosers, is justified. There is presented a method to find SAIFI and SAIDI indicative reliability figures that characterize the average annual number of customer disconnections and the average annual duration of one disconnection in the electrical network.

scholarly journals Improving the efficiency of distribution electric networks of railways based on the multi-agent mode management method

Vestnik IGEU ◽  
2019 ◽  
pp. 54-63
Author(s):  
V.T. Cheremisin ◽  
E.A. Tretyakov
Keyword(s):  
Flow Control ◽  
Power Flow ◽  
Distribution Networks ◽  
Electrical Network ◽  
Distributed Objects ◽  
Electric Networks ◽  
Power Sources ◽  
Power Flow Control ◽  
Multi Agent ◽  
Agent Control

With the increase in observability and controllability of regimes, the development of methods for managing distributed objects of the electrical network is becoming more and more important. The main research directions in smart grids are based on the theory of fuzzy sets, genetic algorithms, neural networks, stochastic control, spectral graph, bilinear matrix inequality constraints. They are aimed at solving multicriterion optimization problems of electric networks with distributed objects and are computationally-demanding and time-consuming. Meanwhile, the methods of multi-agent control of the power supply system based on the parallelization of information flows and coordination of the operation of distributed linear regulators are becoming more common. The purpose of this study is to develop methods for controlling the operating modes of smart distribution electric networks of railways using an agent-based approach for stabilizing voltages within specified limits and reducing electric power losses. This goal can be achieved by solving the problems of developing an algorithm for managing power flows based on the coordinated work of active and reactive power sources and principles of demand management of active consumers. The multi-agent power flow control was realized in the AnyLogic program, the simulation modeling of the electrical network modes was performed in Matlab Simulink with assumptions of linear characteristics of voltage loads. A method has been developed to control the operation modes of smart distribution electric networks of railways based on the presented power flow control algorithm, the hallmarks of which are the use of linearized equations for determining control actions in small increments, which allows high speed data analysis in real time without calculating steady-state modes with disturbances. The obtained simulation results prove the validity of power flow control methods for voltage stabilization based on multi-agent control and the possibility of their practical implementation on modern equipment in smart distribution networks of railways.

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.

A Model of Voltage Distribution and Change of Current in the Network Containing Unaccounted Electricity Consumption

Vestnik MEI ◽  
2021 ◽  
pp. 91-99
Author(s):  
Ivan M. Kazymov ◽  
◽  
Boris S. Kompaneets ◽  
Keyword(s):  
Graphical Representation ◽  
Low Voltage ◽  
Electricity Consumption ◽  
Distribution Networks ◽  
Electrical Network ◽  
Electrical Networks ◽  
Voltage Distribution ◽  
Electrical Grids ◽  
Proposed Model ◽  
Nominal Voltage

The aim of the study is control of commercial losses in electrical grids, especially in low voltage grids, which is one of the priority lines of activities conducted by electric network companies. The complexity of solving this problem is stemming from the difficulty of exactly locating the commercial loss occurrence place under the conditions of extensively branched low and medium voltage electrical networks. Various methods are currently used to determine the commercial loss occurrence places. However, no effective methods have been created for determining the fact and place of unaccounted electricity consumption in networks under the conditions of performing remote analysis of networks based on the data from modern electricity meters used in the automated fiscal electricity metering system. These difficulties can be overcome by developing a model of voltage distribution and change of current in distribution networks of the 0.4--35 kV nominal voltage levels. A model of voltage distribution and changes of current for a network containing unaccounted electricity consumption is proposed. The effectiveness of using the proposed model has been theoretically substantiated; its applicability limits are defined, and the accuracy of the obtained results is estimated. Graphical representation of the proposed model, which is one of the electrical network digital imaging forms, can be used to analyze electrical networks for revealing if there is unaccounted electricity consumption in them. By using the proposed model of voltage distribution and change of current in the network, it is possible to represent the electrical network as a set of electrical parameters to analyze electrical networks for the presence of commercial losses.

Analysis of operation of Oblkommunergo electric networks of Irkutsk Region

2021 ◽  
Vol 14 (3) ◽  
pp. 100-110
Author(s):  
I. V. Naumov
Keyword(s):  
Low Voltage ◽  
Average Duration ◽  
Electric Energy ◽  
Distribution Networks ◽  
Operational Reliability ◽  
Electrical Networks ◽  
Electric Networks ◽  
Public Media ◽  
Irkutsk Region ◽  
Graphic Editor

Analysis has been performed of the operation of electric distribution networks of ten branches of Oblkommunenergo (OKE) of Irkutsk Region [1]. Based on the data on the operation of these networks published in public media, algorithms and computer programs for the Matlab graphic editor are compiled, which are used for plotting time diagrams that characterize the operation of the electrical networks under consideration. The balance changes are shown in the transmission of electric energy into the OKE networks and from the OKE networks directly to consumers (high, medium and low voltage networks). The number of failures, the power supply interruption time and the amount of electricity undersupplied in each month of the year for each of the branches are considered. The months of the year are determined, in which the greatest and least damage occurs to the electrical networks of the OKE branches. Data are presented on the dynamics of annual wear of electric networks, planned activities and their annual implementation. The level of reliability is considered according to the established indicators of the average duration of interruptions in the transmission of electric energy in each calculated regulation period. It is shown that the combination of the main causes of failures largely depends on the natural-climatic and terrain specifics of the regions through which the routes of electric networks pass. As an example, data on the causes of failure in the electrical networks of one of the OKE branches are considered. The most and least damaged electrical networks of the considered OKE branches have been established. In conclusion, findings are formulated and recommendations are presented on minimizing outages based on the main types of failure causes for the purpose of increasing the operational reliability of the electrical networks under consideration.

scholarly journals Management of Water Distribution Systems in PDA Condition with Isolation Valves

Proceedings ◽  
2018 ◽  
Vol 2 (11) ◽  
pp. 672 ◽  
Author(s):  
Attilio Fiorini Morosini ◽  
Olga Caruso ◽  
Paolo Veltri
Keyword(s):  
Distribution Systems ◽  
Water Distribution ◽  
Distribution Networks ◽  
Optimal Number ◽  
System Control ◽  
Pipe Failure ◽  
Reliable System ◽  
Network Nodes ◽  
Pipe Burst

The correct management of Water Distribution Networks (WDNs) allows to obtain a reliable system. When a pipe failure occurs in a network and it is necessary to isolate a zone, it is possible that some nodes do not guarantee service for the users due to inadequate heads. In these conditions a Pressure Driven Analysis (PDA) is the correct approach to evaluate network behavior. This analysis is more appropriate than the Demand Driven Analysis (DDA) because it is known that the effective delivered flow at each node is influenced by the pressure value. In this case, it is important to identify a subset of isolation valves to limit disrupting services in the network. For a real network, additional valves must be added to existing ones. In this paper a new methodological analysis is proposed: it defines an objective function (OF) to provide a measure of the system correct functioning. The network analysis using the OF helps to choose the optimal number of additional valves to obtain an adequate system control. In emergency conditions, the OF takes into account the new network topology obtained excluding the zone where the broken pipe is located. OF values depend on the demand deficit caused by the head decrement in the network nodes for each pipe burst considered. The results obtained for a case study confirm the efficiency of the methodology.

ENERGY IN RURAL AND ELECTRIC NETWORKS

2015 ◽  
Vol 4 (4) ◽  
pp. 10-14
Author(s):  
Гуков ◽  
P. Gukov ◽  
Авдеев ◽  
A Avdeev
Keyword(s):  
Distribution Networks ◽  
Electric Networks

To reduce electricity losses in the distribution networks are encouraged to use condenser units. It is shown that the methods of selecting the compensating capacity of the installation

Protection System Monitoring in Electric Networks with Embedded Generation Using Petri Nets

2008 ◽  
Vol 9 (6) ◽  
Author(s):  
Vito Calderaro ◽  
Vincenzo Galdi ◽  
Antonio Piccolo ◽  
Pierluigi Siano
Keyword(s):  
Petri Nets ◽  
Distribution Systems ◽  
Short Circuit ◽  
Distribution Network ◽  
Distribution Networks ◽  
Protection System ◽  
Electric Networks ◽  
Embedded Generation ◽  
Network Operation ◽  
Monitoring Architecture

The connection of distributed generation (DG) essentially changes the distribution network operation and creates a range of well-documented effects varying the voltage levels and short circuit currents. Among others, DG can alter protection system operations in distribution networks, leading to the failure of reclosing, the disconnection of the healthy feeder or the prevention of a protection operation. This paper proposes a procedure, based on Petri nets and supported by a centralized monitoring architecture, for monitoring failures of the protection systems in radial distribution networks. Some case studies applied to a real Italian distribution network proved the effectiveness of the proposed procedure that can therefore represent an effective solution to improve distribution systems reliability in the presence of DG.

scholarly journals Selection of a Complex of Parameters of Distribution Electric Networks with Respect to Technical Limitations

2020 ◽  
Vol 209 ◽  
pp. 07013
Author(s):  
A D Taslimov
Keyword(s):  
Cross Sections ◽  
Distribution Networks ◽  
Electrical Load ◽  
Electric Networks ◽  
Optimization Analysis ◽  
Urban Distribution ◽  
Selection Of

The article contains an optimization analysis of the regularities of the formation of the parameters of urban distribution networks of 10 kV, taking into account the technical limitations by the method of criteria analysis, which revealed the feasibility of using a limited number of used cable cross-sections, depending on the density of the electrical load and on the schemes of urban distribution networks.

scholarly journals STUDY OF THE NATURE OF OVERVOLTAGES IN THE ELECTRICAL NETWORK ARISING FROM VOLTAGE TRANSFORMERS

2021 ◽  
pp. 28-36
Author(s):  
Oleksii Hanus ◽  
Kostiantyn Starkov
Keyword(s):  
Transient Process ◽  
Distribution System ◽  
Forced Oscillations ◽  
Electrical Network ◽  
Secondary Circuit ◽  
Electric Networks ◽  
Voltage Transformer ◽  
Secondary Resistance ◽  
Non Linear ◽  
Secondary Winding

A non-linear dynamic mathematical model of voltage transformer has been considered and overvoltages arising on the elements of voltage transformer equivalent circuit during transient processes have been investigated. The influence of voltage transformer secondary circuit capacitance on overvoltage multiplicity in the primary circuits and the duration of transients has been determined. The advantages of approximation of nonlinearity of voltage transformers by hyperbolic sine are used. Mathematical expressions determining the nature of changes in the forced and free components of the transient process in an electrical network with a voltage transformer have been obtained. It is shown that with the increase of the electric network capacitance the duration of the transition process damping increases and the frequency of the forced oscillations and the level of overvoltage decrease. It is proved that even small, in comparison with the primary nominal sinusoidal voltage, aperiodic components of the voltage transient process can lead to significant overvoltages during voltage transformer outages. It has been substantiated that both the secondary resistance and the switching torque influence the overvoltage multiplicity arising in the primary winding of voltage transformers. It is shown that the closed secondary winding worsens the disconnection process of non-linear inductance of voltage transformers. The values to which overvoltages increase in this case are determined. According to the results of calculations it is determined that with open secondary winding of voltage transformers the duration of transient process significantly increases. It has been found that the decrease of frequency of forced oscillations, which occurs in this case, is accompanied by an increase of currents in the primary winding of the voltage transformer, which is dangerous in terms of thermal stability of the winding insulation. It is shown, that closing the secondary winding of voltage transformers leads to significant reduction of transient damping time. It is suggested that this algorithm can be used to provide a rapid breakdown (suppression) of ferroresonant processes. The effectiveness of such a measure of stopping of ferroresonance processes as short-term shunting of secondary winding of voltage transformers has been investigated. The correlation of parameters of electric networks (capacity of busbar sections, nonlinearity of characteristics of voltage transformers, disconnection torque, etc.) at which ferroresonance process may occur and consideration of which may allow, in terms of prevention of ferroresonance processes, to identify substations (electric networks) that require more detailed research has been determined. The results of analytical studies were tested in the electric networks of JSC "Kharkivoblenergo" and used in the electricity distribution system for the selection of specific voltage transformers for certain configurations of electrical networks.

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