Moderator: Dr. Zoran SIMENDIĆ, EPS Distribucija, Ogranak ED Sombor

For SMART GRID FORUM 4 papers were presented out of a total of 4, which were included in the Conference programme.

After presenting the papers, the following conclusions were adopted:

1. Continue the former SCADA, distribution management system and other subsystem integrations into an integral system, in order to fulfill the increasing number of requirement they have to meet.

2. It is recommended that initial investments concerning SMART GRID system construction be into subsystems with the greatest effects.

3. Analysis of utilization and operation of renewable energy sources for more efficient electricity production is one of the priorities.

4. Highlighting the importance of continuously gathering and updating the data on MV and LV grid, which is the prerequisite for SMART GRID systems.

Chairman: Prof. Dr. DRAGAN TASIĆ, Faculty of Electronics, Niš, Serbia

Within Session - 1, Distribution substations and power lines, 25 papers were presented out of a total of 28 papers included in the Conference programme. Prof. Dr. Dragan Tasić conducted the Session work with the assistance of expert reporters Ljiljana Funduk, Miodrag Stojanović, M.Sc. and Dr. Vladimir Šiljkut.

After presenting the papers, the following conclusions were adopted:

1. The proposed new technical solutions and new equipment should be adequately perceived, both from the technical, and from the economic standpoint.

2.The implementation of new technological solutions and technologies should be stimulated and operating experience analyzed.

3. Adequate attention should be dedicated to the analysis of operational experience, both from the aspect of distribution substations and power lines maintenance, and from the aspect of envisaged future states.

4. Attention should continuously be dedicated to calculations of the components reliability as well as the entire grid and facilities reliability, in order to form easily applicable adequate models and software solutions on the one hand, and technical solutions providing more reliable electricity supply to consumers on the other hand.

5. It is necessary to deal with the principle of grid components diagnostics and improvement of the equipment maintenance strategy, as well as the strategy of replacing the existing equipment by new equipment.

6. It is necessary to use adequate mathematical models and stimulate the implementation of state of the art software tools for analyzing the network components in normal and emergency conditions.

7. An initiatiative should be given on forming an accredited laboratory for testing the grid components equipment.

8. It is necessary to analyze the environmental impact of grid components and take measures on reducing the harmful effects. It is necessary to critically perceive from time to time the existing legislation in this field.

The most prominent paper:

Chairman: Prof. Dr. Vladimir KATIĆ, Faculty of Technical Sciences, University of Novi Sad

In the absence of the Chairman, the session was chaired by Assistant Professor Dr. Boris DUMNIĆ, Faculty of Technical Sciences, University of Novi Sad.

In this session, 16 papers were presented, covering 6 preferential subjects. The reporters were Lidija KORUNOVIĆ and Milanko RADIĆ, EPS Technical Centre Novi Sad.

CONCLUSIONS:

When monitoring the supply quality indicators, special attention should be dedicated to the causes of faults due to directed investments and maintenance planning.

In grid situations, with typical zero conductor, large currens form technical recommendations for applying a four-pole disconnection.

In maintenance of the compensation cuble, one should particularly check whether the connection is good, as a disconnection of one phase results in inaccurate metering.

Selection and coordination of device for overvoltage voltage protection should comply to the actual operating conditions.

The operating conditions and conditions for connecting the distributed energy sources based on the implementation of invertor devices should comply to the technical recommendations and rules concerning the operation of Electric Power Systems of developed countries.

The most prominent paper:

Chairman: Dušan Vukotić, M.Sc., Subsidiary "EPS Distribucija" d.o.o. Beograd

In SESSION -3, were presented 13 (thirteen) papers and pieces of information out of a total of 15 (fifteen) expert papers, accepted for this year's Conference programme.

After presenting the papers, the following conclusions were drawn concerning several subjects from the field of protection and management in electricity distribution:

1. Automation in medium-voltage electricity distribution (MVDM) has recently gained full intensity and within the MVDM a comparatively large number of automation equipment has been installed. A great number of papers have actually focused on the experience in the the past utilization of automation equipment and this experience is in many cases identical, but, but there is evidently also a certain amount of heterogeneity in the implementation of certain technical solutions. Activities in defining uniform technical specifications for automation equipment within certain work groups in Distribution Subsidiaries dealing with such issues will, to a great extent, eliminate problems in selecting the equipment for installation and their further utilization. Also, on the basis of the presented experience, it is necessary to make additional efforts in order to comply the existing automation solutions as much as possible to the expected recommendations and technical specifications of the automation equipment.

2. Changes in the organizational structure of electricity distribution companies currently operating within a single Distribution System Operator (DSO) from the standpoint of electricity distribution management, calls for defining the existing control centres by hierarchy compared to the entrusted authorization, and compared to the formed National Distribution Dispatch Centre (NDDC). The existing control centres, at all control levels, need to be defined and realized on a single platform, in order to obtain the desired optimal level of electricity distribution control in the overall DSO consumption region.

3. Special attention needs to be dedicated to coordination of adjustment parametres for protective devices within the substations and automation equipment, in order to define new recommendations for setting up Plans for compliance of protective devices in electricity distribution. The subject activity needs to be given priority, as there is a great deal of noncompliance in the grid concerning the automation equipment by DSO distribution regions, which frequently results in unselectivity in terms of the effect of protection which has a direct impact on the reliability of supply to the end customers.

4. The role of telecommunications from the standpoint of implementation of state of the art technical solutions for protection and management within electricity distribution, has recently gained great importance. An optimal desired level of management cannot be realized without a powerful and developed information and telecommunication infrastructure, given that the infrastructure in technical terms ranges from processing to the highest hierarchical level of management – the management hub. Given that the information and telecommunication infrastructure was realized heterogeneously in certain electricity distribution regions with very poor mutual coordination in respect of its development, efforts need to be made in order to define a single framework for further development of the information and telecommunication infrastructure for the purpose of a single DSO.

The most prominent paper:

Chairman: dr Željko POPOVIĆ, EPS Distribucija, Ogranak ED Subotica

1. Integration of distributed power sources

Expert reporter – Dr. Predrag Vidović, Faculty of technical sciences, Novi Sad Serbia

In addition to analyzing the impacts on losses and voltage variations in the MV and LV grid, which was discussed in some presented papers, it is also necessary to analyze the impact of distribution generators on other business processes in the distribution system. First of all, it is necessary to analyze the impact of distribution generators on the long-term distribution grid development planning process, taking into account all relevant aspects of planning (investment costs, costs of losses, costs of outages, short-circuits values, operative restrictions).

2. Efficient use of electricity in load control

Expert reporter - Stanko Knežević, B.Sc.El.Eng., Schneider Electric DMS NS, Novi Sad, Serbia

a. For the purpose of obtaining higher efficiency in electricity distribution, it is necessary, among other things, to continuously monitor the total electricity losses (technical and non-technical) on all voltage levels. In order to allow quality monitioring of the ste of electricity distribution and quality assesment of energy and power in the grid, appropriate tools need to be used (e.g. tools which allow grid modelling, topology analysis, state estimation, load flows calculation) within a single distribution management system (DMS), which is one of the basic components required for implementing the Smart Grids concept. The above system needs to integrate the correponding data on all grid elements (e.g. from GIS) and the best quality data in the grid consumer nodes (e.g. from the AMI/MDM and CIS systems).

b. Load management is one of the important tools (processes) used Smart Grids in a significant number of business processes (operative management in normal and emergency conditions, grid development planning). That is why it is necessary, in addition to the benefits that load management may bring to some customers, also to perceive and assess the possible benefits for other partiicipants as well (electricity producers, transmission and distribution system operators, retailer and wholesale tradesmen, aggregators). Only by perceiving all the benefits, and taking into account the relevant costs, can the effectiveness

3. Smart metres and remote measuring and control systems

Expert reporters - Boris Holik, B.Sc.El.Eng., and Saša Marčeta, B.Sc.El.Eng., Subsidiary of EPS Distribution, Novi Sad, Serbia

a. Introducing advanced metering and the AMI system are the basis for Smart Grids development contributing to the development of the electricity market and higher operational efficiency in electricity distribution companies.

a. Updating of the metering infrastructure needs to be speeded up in compliance with the adopted AMI/MDM system concept.

b. Activities in the field of integration of data from the AMI/MDM system with other technological and business processes within the business distribution system operator need to be speeded up.

c. For the purpose of higher efficiency in struggling with the non-technical electricity losses, utilization of available data from the AMI/MDM system (logs, log books on events, alarm systems, etc.) needs to be more intensive.

d. In the open electricity market conditions, in accordance with the relevant legislation, the following needs to be intensified:

• Utilization of basic system functionalities for remote metering, first of all utilization of real hourly demand profiles for the needs of the transmission system operator (hourly profiles based on real demand data, instead of being based on standardized demand profile diagram).

• Utilization of additional system functionalities for remote metering, first of all, possible access of the system consumers to their data and possible access of the electricity suppliers to their consumers' data.

The most prominent paper is:

Chairman: Dr.Aleksandar Janjić, Faculty of Electronics, Niš

In this session, all 10 presented papers,covering all four preferential subjects, were accepted. The expert reporters for some preferential subjects were Miroslav Dočić, Dr. Dragoslav Jovanović, Saša Minić and Dr. Saša Đekić.

CONCLUSIONS

1. When planning, power flow calculations are of essential importance for accurate assessment of load and voltage conditions in the grid, particularly in the presence of distributed production. For that reason, it is necessary to apply the new ways of power flow calculations in asymmetrical regimes, taking into account different types of distributed energy sources.

2. The environmental and different operational conditions have an impact on the accuracy of power flow calculations in the grid and therefore, depending on the available data, they must be considered in the planning process.

3. Distribution grid reconfiguration should be done by taking into account all limitations, in compliance with all criteria and total grid costs.

4. Higher grid efficiency and lower losses need to be achieved by using tested, as well as new solutions (reactive energy compensation, increased cross-section, application of energy efficiency technologies) and optimal techniques for minimizing the total costs within the system.

Chairman: Dr. Nenad Katić, Faculty of Technical Sciences, Novi Sad, Serbia

Session members and expert reporters:

Dr. Gordan Tanić, Energy Agency of the Republic of Serbia, Belgrade, Vladimir Janković, M.Sc.,EMS, Belgrade, Dr. Savo Djukić, Faculty of Technical Sciences, Novi Sad, Serbia

At the Session held on 29th September, 2016 in Vrnjačka Banja during the 10th Conference on electricity distribution were presented and considered six papers in accordance with the preferential subject of the Session:

• Opening of the electricity market and deregulation of electricity sector in the region.

• Methodologies of regulation and experience.

• Principles and experience of electricity markets, new electricity providers and experience in contracting deliveries.

• Smart Grid solutions in competitive environment of open electricity market.

After considering the papers the following conclusions were made:

1. The electricity market within the region has been established and on the basis of the first experience further steps are underway in order to continue with the improvement of regulating models, particularly in the field of incentive schemes.

2. For the purpose of more efficient operation in the electricity distribution companies, significant research work is being done in order to establish high quality models for assessing electricity supply efficiency and reliability, which will be the basis for establishing incentive models.

3. Incentive models will be focused on monitoring, rewarding and penalizing grid operation performances, and at a later time on the quality of services and electricity supply.

4. Support of management information systems and optimization methods for achieving more efficient grid management is of great importance for impoving the business activities of electricity companies on the open electricity market.

The most prominent paper: