Feasibility Assessment of Urban Electricity Distribution Networks Transition to the Voltage Level of 20 kV

2018 ◽  
pp. 57-65
Author(s):  
I. A. Kuzmina
Keyword(s):  
Electric Power ◽  
Distribution Network ◽  
Distribution Networks ◽  
Electricity Distribution ◽  
Voltage Level ◽  
Electrical Grid ◽  
Medium Voltage ◽  
Feasibility Assessment ◽  
Industrial Enterprises ◽  
Electrical Grids

The article gives a feasibility assessment for increasing a voltage level of the urban electricity distribution networks from 6 and 10 kV to 20 kV.The emphasis is on the urban electricity distribution network in Moscow. It is noted that by now the reliability, efficiency and automation indicators of Moscow electrical grids are substantially lower than those of Europe, America, etc. The electrical grids in Moscow have a high wear and tear of equipment, a historically developed non-optimal structure, and a high loading level. In recent years, the situation has been significantly improved due to numerous government programs for the development of the electric power industry.It was noted that the high rate of development in Moscow resulted in a significantly increasing density of power loads. So modernisation of grids is a necessary-and-proper step to deliver electric power of good quality and in appropriate volume to all consumers. As the most promising option of such modernisation, the article’s proposal is to increase a voltage level of the electrical grid of medium voltage from 6 and 10 kV to 20 kV.The main advantages of the electrical grid transition to the higher voltage level is an increased power grid capacity and reduced losses of voltage and electric power when transmitting through the electrical grid elements. The article presents some calculations to prove decreasing several times losses in medium voltage cable lines. The shortcoming of the transition to an electrical grid of 20 / 0.4 kV is significant implementation costs, most of which will lead to increasing tariff for consumers.The experience of other countries examined in the article proves that increasing voltage level of the distribution network in Moscow and other megacities is expedient. At the same time, a gradual introduction of 20 / 0.4 kV substations to the electrical grid structure with a gradual unloading and elimination of 10 kV electrical grid elements is expected. The article appeals to successful experience available in the transition of large industrial enterprises to a voltage level of 20 / 0.4 kV.

scholarly journals AN APPROACH FOR COMMUNICATION RELAIBILITY USING SELF-ADAPTIVE AUTONOMIC COMPUTING TECHNIQUES

2019 ◽  
Vol 18 (1) ◽  
pp. 041
Author(s):  
Aleksandar Stanimirović ◽  
Miloš Bogdanović ◽  
Nikola Davidović ◽  
Aleksandar Dimov ◽  
Krasimir Baylov ◽  
...  
Keyword(s):  
Electric Power ◽  
Power Supply ◽  
Autonomic Computing ◽  
Low Voltage ◽  
Distribution Network ◽  
Electric Power Industry ◽  
Distribution Networks ◽  
Electricity Distribution ◽  
Time Data ◽  
Self Adaptive

Interdependency of electric power grids and information and communication technology is a rapidly growing topic. With the introduction of Smart Grid, handling dynamic load tracking, dynamic tariffs, clients that can consume but also produce electricity that can be delivered to the grid has become a part of everyday operational cycles within power supply companies. Hence, electricity distribution and power supply companies are in need for introduction of efficient mechanisms for the optimal tracking and use of available electric energy. In this paper, we describe the low voltage (LV) distribution network monitoring system developed for the Electric Power Industry of Serbia (EPS) electricity distribution company. The system we present is implemented in a way so that it provides abilities to measures, communicates and stores real-time data, translating it into actionable information needed by EPS to meet the described challenges regarding LV distribution networks. The implemented system is using self-adaptive autonomic computing techniques to provide a reliable data transfer from measurement devices deployed in different parts of the LV distribution network.

scholarly journals Research and Application of a Clear Diamond-Shaped Distribution Network Structure

2021 ◽  
Vol 9 ◽  
Author(s):  
Liu Shengli ◽  
Wu Jun ◽  
Xue Longjiang ◽  
Wu Di ◽  
Lu Haiqing ◽  
...  
Keyword(s):  
Network Structure ◽  
Power Supply ◽  
Distribution Network ◽  
Regional Distribution ◽  
Distribution Networks ◽  
Ring Network ◽  
Medium Voltage ◽  
Double Ring ◽  
Diamond Type ◽  
Supply Reliability

Aiming at the problems of low power supply reliability, poor transfer capacity between stations, and low line utilization in the current distribution network, this paper proposes a diamond-shaped distribution network structure with a clear structure. First, we investigated the typical wiring patterns of medium-voltage distribution networks in Tokyo, Japan, Paris, France, and China’s developed cities, and summarized experience and shortcomings. Secondly, combining the typical wiring patterns of distribution networks in China and abroad, construct a diamond-shaped distribution network structure, and study its adaptability, safety and flexibility, power supply reliability, and economy. Finally, take the transformation of the wiring mode of a regional distribution network in a certain city as an example, compare the use of the diamond-shaped distribution network structure in this article with the use of cable double-ring network wiring, cable “double petal” wiring, and Shanghai diamond-type wiring distribution network grid reconstruction The effect verifies the superiority of the diamond-shaped distribution network structure in this paper.

Research on Reactive Power and Voltage Optimization of Regional Distribution Network

2011 ◽  
Vol 58-60 ◽  
pp. 474-479
Author(s):  
Yu Du
Keyword(s):  
Reactive Power ◽  
Regional Distribution ◽  
Distribution Networks ◽  
Radiation Characteristic ◽  
Reactive Power Optimization ◽  
Voltage Level ◽  
Medium Voltage ◽  
Regulation Effect ◽  
Practical Operation ◽  
Transformer Taps

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.

Pengaruh tegangan kerja terhadap spektrum frekuensi gelombang arus bocor pada isolator keramik

JURNAL ELTEK ◽  
2020 ◽  
Vol 18 (2) ◽  
pp. 59
Author(s):  
Awan Setiawan ◽  
Imron Ridzki ◽  
Priya Surya
Keyword(s):  
Leakage Current ◽  
Phase Difference ◽  
Distribution Networks ◽  
Electricity Distribution ◽  
Voltage Level ◽  
Current Leakage ◽  
Silicon Rubber ◽  
Tropical Areas ◽  
Source Voltage

Penyaluran energi listrik pada jaringan PT PLN PERSERO khususnya pada jaringan distribusi sering mengalami kegagalan yang disebabkan arus bocor pada isolator keramik. Intensitas kerusakan disebabkab oleh polutan debu yang menempel pada permukaan isolator, ditambah pula dengan kelembaban udara yang ada di daerah tropis seperti Indonesia. Hal ini secara kumulatif, menyebabkan flashover pada permukaan isolator dan menyebabkan kegagalan penyaluran energy listrik pada jaringan. Pengaplikasian Silicon Rubber sebagai bahan pelapis isolator dapat mengurangi polutan debu yang menempel pada permukaan, hasil penelitian menunjukkan bahwa parameter tegangan akan berpengaruh juga pada besarnya arus bocor yang mengalir pada permukaan isolator. Semakin tinggi tegangan kerja akan memperbesar nilai RMS arus bocor yang mengalir. Terukur pada level tegangan 20 kV arus bocor yang terukur memiliki RMS sebesar 0,0432 A dengan THD sebesar 15,76 % dengan beda fasa arus bocor terhadap tegangan sumber bersifat leading hampir mendekati α = 900. Distribution of electricity in PT PLN PERSERO network, especially in distribution networks often fails due to leakage current in ceramic insulation. The intensity of damage caused by dust pollutants that are attached to the insulation surface, coupled with the humidity of the air in tropical areas such as Indonesia. This cumulatively causes flashover on the insulation surface and causes failure of electricity distribution to the network. The use of Silicon Rubber as an insulating coating can reduce the amount of dust contaminated on the surface, the results show that the voltage parameter will also affect the amount of leakage current flowing to the insulation surface. Higher working voltage will increase the current RMS leakage value. Measured at a voltage level of 20 kV the current leakage was RMS 0.0432 A with THD of 15.76%, phase difference of leakage current to leading source voltage is almost close to α = 900.

scholarly journals Security-Constrained Day-Ahead Operational Planning for Flexible Hybrid AC/DC Distribution Networks

2019 ◽  
Vol 9 (21) ◽  
pp. 4685 ◽  
Author(s):  
Ahmad Asrul Ibrahim ◽  
Behzad Kazemtabrizi ◽  
Javier Renedo
Keyword(s):  
Distributed Generation ◽  
Optimal Power Flow ◽  
Distribution Network ◽  
Distribution Networks ◽  
Operational Planning ◽  
Hybrid Network ◽  
Management Framework ◽  
Medium Voltage ◽  
Operational Costs ◽  
Network Losses

A new active network management framework is presented based on a multi-period optimal power flow problem that is bounded by security constraints at the distribution level for upholding the security of supply. This can be achieved through active engagement with flexible demand and distributed generation to prepare for contingency events in day-ahead operational planning. This framework is coupled with a flexible hybrid AC/DC medium voltage (MV) distribution network topology. It contains an integrated multi-terminal medium voltage DC (MVDC) interface for a seamless interaction and integration of the flexible demand and generation on both AC and DC sides of the hybrid network. The active energy management framework when coupled with a flexible hybrid AC/DC topology provides unprecedented degrees of flexibility as well as security of operation under a variety of conditions. To this end, the 75-bus UK generic distribution network has been modified and converted into a hybrid AC/DC network using the integrated MVDC interface. This framework is then deployed to minimise operational costs to the network operator, considering costs of schemes such as distributed generation curtailment and flexible demand shifting, as well as network losses. Results show a significant improvement in operational costs when the network operates as a flexible hybrid when compared to a pure AC or a more conventional AC/DC hybrid.

scholarly journals Automatic Fault Localization and Isolation in Power Distribution Network by Decision Support Method

2021 ◽  
Vol 18 (4) ◽  
Author(s):  
Satya PRAKASH ◽  
Manoj HANS ◽  
Vikas THORAT
Keyword(s):  
Electricity Market ◽  
Power Distribution ◽  
Low Voltage ◽  
Distribution Network ◽  
Distribution Networks ◽  
Distribution Automation ◽  
Power Distribution Network ◽  
Medium Voltage ◽  
Time Observation ◽  
And Control

The power distribution network has grown complex and vulnerable as it increases its demand. The system's reliability has become a prominent factor for the end-users, although the continuity of supply in the distribution network still remains a challenge. In order to achieve the same distribution, automation came into the picture. The term “Distribution Automation” usually refers to an advanced switching system, which works as a subsystem of the existing network. The purpose of the subsystem is to offer real-time observation and control in distribution networks and electricity market operations. Consequently, the development of an autonomous system for isolating failures and restoring power for the distribution of LV (low voltage)/MV (medium voltage) can be an attractive solution for improving energy facilities' reliability. Advanced management techniques are devices and algorithms used to analyze, diagnose, and predict conditions in a distribution network, as well as to identify and take appropriate corrective actions to eliminate, mitigate, and prevent power outages and power quality problems. To demonstrate the model, we used a PIC16F877, CT microcontroller, and a power supply unit.

scholarly journals Stochastic Planning and Operational Constraint Assessment of System-Customer Power Supply Risks in Electricity Distribution Networks

2021 ◽  
Vol 13 (17) ◽  
pp. 9579
Author(s):  
Mikka Kisuule ◽  
Ignacio Hernando-Gil ◽  
Jonathan Serugunda ◽  
Jane Namaganda-Kiyimba ◽  
Mike Brian Ndawula
Keyword(s):  
Sequential Monte Carlo ◽  
Network Reliability ◽  
Distribution Network ◽  
Integrated Approach ◽  
Distribution Networks ◽  
Test System ◽  
Electricity Distribution ◽  
Reliability Indices ◽  
Operational Constraints ◽  
The Impact

Electricity-distribution network operators face several operational constraints in the provision of safe and reliable power given that investments for network area reinforcement must be commensurate with improvements in network reliability. This paper provides an integrated approach for assessing the impact of different operational constraints on distribution-network reliability by incorporating component lifetime models, time-varying component failure rates, as well as the monetary cost of customer interruptions in an all-inclusive probabilistic methodology that applies a time-sequential Monte Carlo simulation. A test distribution network based on the Roy Billinton test system was modelled to investigate the system performance when overloading limits are exceeded as well as when preventive maintenance is performed. Standard reliability indices measuring the frequency and duration of interruptions and the energy not supplied were complemented with a novel monetary reliability index. The comprehensive assessment includes not only average indices but also their probability distributions to adequately describe the risk of customer interruptions. Results demonstrate the effectiveness of this holistic approach, as the impacts of operational decisions are assessed from both reliability and monetary perspectives. This informs network planning decisions through optimum investments and consideration of customer outage costs.

Allocation and Sizing of Dispersed Photovoltaic Generation in Diesel Isolated Electrical Systems Using an Analytical Approach

2014 ◽  
Vol 136 (4) ◽  
Author(s):  
Claudio Goncalves ◽  
J. Paulo A. Vieira ◽  
Dione J. A. Vieira ◽  
M. Emilia L. Tostes ◽  
Bernard C. Bernardes ◽  
...  
Keyword(s):  
Active Power ◽  
Voltage Profile ◽  
Power Losses ◽  
Analytical Methodology ◽  
Photovoltaic Generation ◽  
Electrical Grid ◽  
Medium Voltage ◽  
Electrical Systems ◽  
Electrical Grids ◽  
Active Power Losses

This paper proposes an analytical methodology to allocate and size active power photovoltaic generation (PVG) units with embedded DC/AC inverter (PVGI) to be integrated as concentrated or dispersed generation in isolated medium voltage electrical grids. The methodology considers multiple objectives: improving the electrical grid voltage profile; reducing active power losses and the diesel generation participation. To validate the proposed methodology, the IEEE 33 and 69 buses networks and an isolated real electrical system were simulated. The results obtained demonstrated that the proposed methodology is effective in providing a solution with improvement in voltage profile, active power losses reduction, diesel generation participation reduction.

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