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An electrical energy is and would be one of the most important energy sectors. By accepting green resolutions to generate electricity, researchers are giving their best to get the most reliable and efficient way to generate electricity with renewables. As renewables are intermittent in nature healthy management system is very important. In this article, we have demonstrated 2-way energy and communication flow with peer-to-peer energy transfer. Users and utility connection is distinguished with the Smart Control Panel in the street, which empower small prosumer to participate in the market. To identify algorithm and system management, two cases are considered. Normal Gird operation and Faulty Grid. The result shows that systems have the potential to withstand for a quite long time to get supplied to the street even without taking electricity from the main grid. This system saves user rights to use electricity anytime in a day with a full load and including cost-saving phenomena.

The future power system must provide electricity that is reliable and affordable. To meet this goal, both the electricity grid and the existing control system must become smarter. In this paper, some of the major issues and challenges of smart grid’s development are discussed, and ongoing and future trends are presented with the aim to provide a reader with an insight on the relevant research topics, challenges and actual engineering tasks in smart grids. The focus areas of this review study are distributed generation, microgrids, smart meters’ deployment, energy storage technologies, and the role of smart loads in primary frequency response provision. The exploration of smart grid technologies and distributed generation systems has been accomplished, and a general comparison of the conventional grid and a future smart model is included. The issue of increasing penetration of renewable energy sources to the power system and posers related to the integration of distributed generation are also presented.

To reduce emissions worldwide, decarbonization has also affected for power engineering and its conventional methods of power generation, distribution, and transmission. This fact affects not only the production of power and supply itself, but also other parts related to it, namely systems for the protection of electricity generation facilities and the location of faults in distribution networks and transmission systems. Is this new technology of renewable energy sources (RES) mastered enough to be able to replace traditional methods of energy generation reliably and safely? If we can answer the previous question, we could proceed to the next phase of putting these technologies into practice, considering the actual state of distribution networks and transmission systems. The aim of the article will be to evaluate the current state of systems and production sources of electricity in the Slovak Republic and to provide a better insight and suggestions for rebuilding current networks on a smart grid. The proposals will also include models of some RES in the Matlab/Simulink software.

This paper deals with the research of FACTS devices, specifically TCSC regulators. In the research, the NEPLAN program compiles a mathematical model of the TCSC system for the control of oscillations and the improvement of the dynamic stability of the transmission system. The TCSC element is implemented in the design in two places, namely in stations with generator outlets. The first outlet is the Mochovce nuclear power plant and the second on the outlet line of the Vojany thermal power plant. The height is mainly focused on reducing oscillations in short circuits. The result is the processing of dynamic stability data at a set short circuit with and without a TCSC device, as well as how this affects the CCT (Critical clearing time).

The occurrence of renewable energy sources (RES) in distribution systems has increased significantly in recent years, with this change in fundamental changes to the conventional concept of central energy production to local production and consumption. The integration of RES reduces transmission losses and increases the operational reliability of the distribution network, while new problems associated with this change arise, especially in systems of protected and localized failures in the networks. Distribution systems are traditionally associated with the radial topology of larger networks. The standard STN EN 60909 (33 3020) does not take into account the contributions of photovoltaic stations, while their impact takes into account the growing number and performance in distribution networks will be crucial for changes in the systems of protected equipment in the future.

This paper discusses the problem of reliability of the Polish medium voltage power lines. It presents the benchmarking of power lines and values of SAIDI. The probability density distribution of the medium voltage lines length as well as selected indicators of the MV power lines reliability, being operated by the distribution companies under test, are also introduced. The analysis is based on the actual MV lines and uses the nonparametric method of kernel density estimation.

Paper deals dynamic calculations. It presents two cases for real black start tests and shows their dynamic simulation.

This paper deals with the analysis of the transient phenomena caused by the operation of the electric arc furnace in the 22 kV network, describes the causes of their origin and proposes the possibilities of their reduction with regard to the fulfillment of the quality of electric energy. In particular, it focuses on assessing the short-term flicker rate and the use of the STATCOM device to reduce it. The analysis and subsequent reducing of transient phenomena impact was realized by simulations using the Matlab / Simscape Power Systems tool. The obtained results were evaluated in accordance with the valid European standards and legislation of the Slovak Republic.

This paper deals with the impact of a low voltage smart grid on the distribution system. The last European directives 2014/94 / EU, 2009/28/EC and 2010/31 / EU, bring new problems to solve for distribution system operators. The existing networks of distribution systems are not prepared to fulfill these criterions. Paper shows results related with application of this new directives on existing distribution systems.

The world demands a smart and green future in every sector, which directly corresponds to increases in electrical energy demand one way or another. It is unfeasible to attain future energy demand with the present electrical infrastructure. That means more research and development is required. Future energy sources should be intermittent, and, in addition, the energy sector should be more inwards for distributed energy generation with demand side control. In such cases, the smartest and most autonomous system would be essential to deliver an adequate power supply with all electrical properties. A real-time monitoring and control system with a self-healing infrastructure is a forthcoming desideratum. By accepting these challenges, we have designed a smart street. The basic idea of the smart street is presented in this paper as a landing page, the paper is more focused on emphasizing information regarding the electrical energy flow algorithm for the household, street, and street battery storages. This algorithm is helpful for two-way energy flow and the automatic detection of islanding and the grid connection mode. It will be not only helpful for the users but to the utility as well.

One way of handling short-time short-circuits without causing equipment failure is the management of the reclose function integrated into smart switchboard which is described in this article. Due to the cost of the application, the optimal placement of such equipment must be well-planned. During the planning of the placement optimization of a low-voltage electricity network quality, the increase of the consumer supply security must be considered along with the best economic utilization. The research presented in this article aims to introduce a new special decision support methodology calculated with these variables. The management of smart switchboard (SSB) tool installation into low voltage (LV) network was investigated. The selection of the placement nodes is based on the complex investigation of the network characteristics. Investigation is performed by empiric analysis. This method can support the power companies to make the optimal decision. The presented new device can have outstanding importance for the electric industry and for further research as no testing results of such investigations have been published yet.

This article discusses the design of a power station earthing system using two methods that are compared to each other. The design was based on the software method using CYMGRID and the mathematical method based on IEEE 80-2000. The process in both methods is aimed at creating a grounding model, determining the overall resistance, overloading the cross-sections of the earthing switches and adhering to the limit values for the touch and step potential. The work compares these analyses and evaluates the differences in design and possible shortcomings, such as the possibility of over-dimensioning or underestimating the grounding system.

The article deals with the research of devices used to improve the transient stability of the power system. It refers to current global electricity trends, leading to ever-increasing electricity transmission. This is due both to the increase in consumption and production of electricity, as well as to the creation of a single electricity market. Recently, there is an increasing problem of the operation of renewable resources with unpredictable production, which also often contributes to the creation of unplanned transit flows and to the deterioration of system stability.

This article deals with the issue of creating a network analyzer of the power quality using the open-source platform in the form of the Raspberry Pi microcomputer. This paper presents a proposal design of a measurement circuit for recording the AC voltage up to 1500 V and a subsequent analysis of the measured data.

This article deals with the analysis of a day-ahead generation diagram in specific part of a power network with renewable energy sources. As a renewable energy source a photovoltaic power plant was chosen. Input data for a day-ahead analysis was obtained from the database of previous measurement that was realised on the existing configuration in off-grid network at the department of authors. The simulation network was created in Matlab/Simscape Power System environment that consisted of rotating generators (for regulation of generated power due to fluctuated power generation from photovoltaic sources) and photovoltaic power plant of variable energy generation and loads. The results refer to a necessity to consider the previous measured data of the weather for prediction of future expectation of a day-ahead load diagram.