Field Of Electrical Power Engineering Research Articles

Load Flow Analysis of 10-Bus Test System

The importance of power flow analysis can’t be overstated. In the field of electrical power engineering, it is critical for both the utility and the consumer to understand a variety of electrical variables such as voltages and power flows inside power systems. This paper effectively applies Power World Simulator software to perform load flow analysis on a typical power system. The results may be applied to a much more complicated system with many loads and a range of power supply sources.

Разработка, реализация и оценка эффективности дополнительной образовательной программы по электробезопасности

Currently, the fourth industrial revolution has a significant impact on educational activities, as a result of which many aspects of human life are digitalized, in this regard, there is a need for rapid and high-quality retraining of specialists in the field of electric power engineering. The article touches upon the urgent problem of reducing the level of fatalities at power facilities by introducing an additional educational program. The practical signifi-cance of the study lies in the improvement of additional educational program on electrical safety. The concept of “additional educational programs” (AEP) is disclosed. Particular attention is paid to the formation of neces-sary knowledge and skills of enterprise employees and future specialists in the field of electric power engineer-ing with the help of additional educational program. The article considers the efficiency of using the additional educational programs and reveals their potential for improving the quality of education. In conclusion, the arti-cle reveals the main principles of successful implementation of an additional educational program.

METHODOLOGY AND SOFTWARE COMPLEX OF GAME-BASED TRAINING AND TESTING FOR ELECTRIC POWER ENGINEERS

The article deals with the introduction of game-based pedagogical technologies. The essence of game technologies is substantiated, the functions of the educational game are shown, the peculiarities of using game-based learning technologies in the process of forming the competences of future electrical engineers are identified. A significant place is given to the author's development of a methodology and software package for game-based learning and testing for electric power engineers. The development is based on modern knowledge in the field of electric power engineering and engineering pedagogy. A specific form of implementation of this project is presented - the test game “Professional”. The main characteristics of the computer programme and requirements for computer software are considered. The development implements a new methodology of game-based training and testing of electricians and can be used at all stages of training of an electrical engineer. The purpose of the development is to intensify and improve the efficiency of the educational process through the introduction of new teaching technologies.

Synchronization stability and multi-timescale analysis of renewable-dominated power systems.

Synchronization is one of the key issues in three-phase AC power systems. Its characteristics have been dramatically changed with the large-scale integration of power-electronic-based renewable energy, mainly including a permanent magnetic synchronous generator (PMSG) and a double-fed induction generator (DFIG) for wind energy and a photovoltaic (PV) generator for solar energy. In this paper, we review recent progresses on the synchronization stability and multi-timescale properties of the renewable-dominated power system (RDPS), from nodes and network perspectives. All PMSG, DFIG, and PV are studied. In the traditional synchronous generator (SG) dominated power system, its dynamics can be described by the differential-algebraic equations (DAEs), where the dynamic apparatuses are modeled by differential equations and the stationary networks are described by algebraic equations. Unlike the single electromechanical timescale and DAE description for the SG-dominated power system, the RDPS dynamics should be described by the multiscale dynamics of both nodes and networks. For three different timescales, including the AC current control, DC voltage control, and rotor electromechanical timescales, their corresponding models are well established. In addition, for the multiscale network dynamics, the dynamical network within the AC current control timescale, which should be described by differential equations, can also be simplified as algebraic equations. Thus, the RDPS dynamics can be put into a similar DAE diagram for each timescale to the traditional power system dynamics, with which most of power electrical engineers are familiar. It is also found that the phase-locked loop for synchronization plays a crucial role in the whole system dynamics. The differences in the synchronization and multiscale characteristics between the traditional power system and the RDPS are well uncovered and summarized. Therefore, the merit of this paper is to establish a basic physical picture for the stability mechanism in the RDPS, which still lacks systematic studies and is controversial in the field of electrical power engineering.

Development of a professional game for power engineers “Professional”

The article considers the development of a professional game for training and testing of electric power engineers “Professional”. It is based on modern knowledge in the field of electric power engineering and engineering pedagogy. The main characteristics of the software and requirements for the computer hardware are presented. The development implements a new methodology for game-based training and testing of electricians and can be used at all stages of training an electrical engineer. The considered methodology is based on competence-based approaches. The aim of the development is to intensify and improve the efficiency of the educational process through the introduction of new teaching technologies. The technical capabilities of the software allow for both individual and team work of students and electric power personnel.

Foreign language information activity of a technical university student

Introduction. Training future engineers for professional activities is an urgent task in modern Russian society. Changes taking place in the global space require an increased emphasis on the need for productive information interaction within the professional activities of technical specialists. The problem of technical university students` ability to use a foreign language as a means of working with professionally oriented information is posed. The purpose of this article is to identify the features of specialists' proficiency in working with foreign language professionally oriented information and to find ways to improve the quality of information activities in a foreign language. Materials and Methods. A review of the literature on the problems of the study was carried out. In the course of the study, methods of theoretical analysis of scientific literature, generalization and systematization, pedagogical observation and modeling were used. Results. The main tasks of professional training of technical specialists in the field of electric power engineering and electrical engineering are given. The importance of mutual integration of professionally oriented knowledge, foreign language proficiency and a set of skills of search, processing, fixation, transfer of information has been substantiated. The category of "foreign language information activity" has been specified. In addition, the structure of foreign language information activity of a technical university student is revealed. Practical experience in forming skills of working with foreign-language professionally oriented information on the basis of the author's textbook is described. The results of the quality of mastering foreign-language information activities by technical university students are given. Discussion and Conclusions. Involving of technical university students in foreign language information activities is one of the effective ways to improve their professional training. The importance of forming and improving the skills of information activity in a foreign language among technical university students during their undergraduate and postgraduate studies is discussed. The question of the possibility of researching these processes in multilingual professional environments is raised.

The Concept and Understanding of Synchronous Stability in Power Electronic-Based Power Systems

Synchronous stability in power systems is of essential importance for system safety and operation. For the phase-locked loop (PLL)-based synchronous stability in power electronic-based power systems, which has recently stimulated interest in researchers in the field of electrical power engineering, but is still controversial, this paper divides the topic into two aspects, including the PLL device stability and the system stability. It is found that the PLL device is always stable and the error between the PLL output angle θpll and the terminal voltage angle θt is always finite. Therefore, the synchronization of power electronic-based power systems should be understood as the output synchronization between the electrical rotation vectors (θt or θpll) from each item of grid-tied equipment, rather than the synchronization of the PLL device itself. In addition, it is found that θpll plays an active role in the system synchronization dynamics not only in electromagnetic timescales but also electromechanical timescales and it could be selected as a dominant observable. In this paper, the concept of synchronous stability is well clarified. These findings are well supported by theoretical analyses and MATLAB/Simulink simulations, and thus could provide insights on the synchronous stability mechanism.

Synchronization stability of power-grid-tied converters.

Synchronization stability is one of central problems in power systems, and it is becoming much more complicated with the high penetration of renewable energy and power electronics devices. In this paper, we review recent work by several nonlinear models for renewable-dominated power systems in terms of multiple timescales, in particular, grid-tied converters within the DC voltage timescale. For the simplest model, a second-order differential equations called the generalized swing equation by considering only the phase-locked loop (PLL) is obtained, which shows a similar form with the well-known swing equation for a synchronous generator in the traditional power systems. With more outer controllers included, fourth-order and fifth-order models can be obtained. The fourth-order model is called the extended generalized swing equation, exhibiting the combined function of grid synchronization and active power balance on the DC capacitor. In addition, a nonlinear model for a two coupled converter system is given. Based on these studies, we find that the PLL plays a key role in synchronization stability. In summary, the value of this paper is to clarify the key concept of the synchronization stability in renewable-dominated power systems based on different nonlinear models, which still lacks systematic studies and is controversial in the field of electrical power engineering. Meanwhile, it clearly uncovers that the synchronization stability of converters has its root in the phase synchronization concept in nonlinear sciences.

Studying the Features of Streamer Formation and Development in Air by Using Computation Experiments

The aim of the work is to estimate the relevance and current state of the problem of mathematical modeling of streamer discharges in air, as well as to identify the features pertinent to formation and initial development stage of two-head streamers in air by using computational experiments. The streamer discharge mathematical model developed at the National Research University Moscow Power Engineering Institute Department of High Voltage Engineering and Electrophysics was used as the research tool. It is shown that mathematical modeling of a streamer discharge can be effectively used in its studies and in training specialists in the field of electric power engineering and high-voltage electrical technologies. The article presents the results of computational experiments on studying the occurrence of streamers in a discharge gap filled with dry air with a uniform electric field (EF) under standard atmospheric conditions. The initial conditions were chosen so that a single-avalanche-streamer formation mechanism was realized. It is shown that in the considered range of initial conditions, the distance between the anode and initial inhomogeneity has a weak, within 1%, influence on the minimum and maximum values of electric field strength in the streamer. A different picture is observed on the anode surface. When a two-head streamer is formed in the discharge gap depth, the field strength at the anode remains close to the average strength in it. As the negative streamer head approaches the anode, the field strength on its surface increases to values close to those achieved in the positive head. After that, the field at the anode weakens rapidly to a level at which effective impact ionization becomes impossible. The article will be of interest for specialists and graduate students working in the field of electric power engineering and high-voltage electrical technologies.

Concerning the Issue of Obligatory State Regulation of Electric Power Complex

The necessity of state regulation in economy is explained by objective possibilities to prevent and smooth out adverse characteristics of economic laws, relationships between participants, macro- and micro- economic and geopolitical factors. At the current stage of development state acts not only as a regulator, but also as an equal active participant of social and economic processes, which implies realization of state dirigism. Through regulation mechanism state exerts accurate and composite impact on economy ensuring its sustainable development. The goal of the research is to shape lines in state regulation of the electric power complex in order to eliminate disproportions in social and economic development. The subject of the research includes economic relations arising in the process of state impact on economic processes in the electric power complex. The research is based on academic and specific methods of studying objective reality. During the research the authors used information of the Federal Antitrust Service, the Federal Service of State Statistics, materials of global independent analytical agencies and informational portals. The authors identified key lines in state regulation and development of competitive relations in the field of electric power engineering. The obtained findings can be used to shape well-balanced risk-oriented policy of state regulation that takes into account all risks of economic development.

Department of energy and power systems – 80 years of success in science, teaching and cooperation with industry

The Department of Energy and Power Systems of the Faculty of Electrical Engineering and Computing, University of Zagreb was founded in 1934 and celebrated its 80th anniversary in 2014. In its long history, many well-known experts, members of the Department, have left their mark on the power engineering activity in Croatia. The Department has been studying and creating improvements in the fields of production, transmission, distribution and final use of electricity, renewable energy sources, advanced power grids, electricity management problems, electricity trading and markets problems and usage of other forms of energy. Throughout the years, the Department has become the leading institution in the field of electrical power engineering in the region, maintaining long-term cooperation with the industry sector and has been recognized for scientific activity since the time of professor Požar and his establishment principles of the Zagreb School of Energy. Determined to remain a respectable research institution, the Department undertakes scientific research at the highest international levels through which valuable international cooperation with many research institutions around the world has been established.

Formation of Scientific Foundations of Technosphere Safety Among Students of the Direction of Training "Electric Power and Electrical Engineering”

The article deals with issues related to the formation of scientific foundations of technosphere safety in the training of students and specialists in the field of electric power industry. Technosphere safety in the field of electric power engineering should be formed on the theoretical basis of the subjects of ecology and life safety.

W sprawie określenia systemu zasad regulacji administracyjno-prawnej działalności podmiotów monopoli naturalnych w sektorze energii elektrycznej Ukrainy

The article deals with the analysis of modern scientific views on determining the content of the principles for legal regulation development. In particular, the author investigates issues of administrative and legal regulation of natural monopoly entities activity in the field of electric power engineering in Ukraine. Ths way of author’s approach can be explained by the peculiarities of relations in the sector of electric energy production in Ukraine. These peculiarities include: the necessity to regulate competition on electricity market, prevention of corruption and other negative consequences of the monopoly, as well as the increasing of investment attractiveness in the electric power sector. Th author shows that the relevance of this research is determined by the dynamic development of legislation within this industry along with conditions of legal relations in the field of electricity, in particular, the launch of new entities into the electricity market. There it is shown that the current legislation of Ukraine defines the relevant standards of functioning of the electricity market, concerning general approaches to the content of state policy in this sector of economy. At the same time, it was emphasized that the system of principles for administrative and legal regulation of the subjects of natural monopolies activity in the field of electricity is subject to further investigation. The content of sectoral legislation governing the electricity sector and anti-monopoly one that defines the legal status of natural monopoly entities are analyzed in detail. It is shown that at present time the authorities that are to legislate these principles have established them just in some certain areas of administrative and legal regulation in this field without proper systematic and scientifically grounded approach. According to the author’s idea, such a situation may complicate the law enforcement practice, since the question of the application of a particular system of principles remains dim. Th author has formulated the conclusion on the need for improvement of sectoral legislation, which would ensure balance of interests between manufacturers and consumers of electricity, taking into account the whole economic system of the country.

A Method for Detecting Parasitic Circuits in the Same DC System

In the electric power system, The DC power supply system used in substation station in power system is related to the normal operation of primary and secondary equipment in substation, and its importance is self-evident?Therefore, in the early power design of substations, the dual-loop power supply mode is specially designed for some important loads or equipment in order to ensure the reliability of power supply for these important loads?However, due to the construction of lines, maintenance of equipment, equipment failure, and management is not in place, design drawings are missing and other reasons, often lead to some load parasitic loop phenomenon?Because of the existence of parasitic circuit, it will cause some hidden dangers to the DC power supply system?Therefore, the detection of parasitic circuits is also one of the most concerned issues in the field of electric power engineering, which needs further extensive and in-depth study?

Modelling of Metal Oxide Surge Arresters in Simulation Software DYNAST

This paper describes the possibilities for mathematical modelling of gap-less surge arresters in simulation software DYNAST. This tool does not belong to standard modelling softwares in the field of electric power engineering. However, it may provide some key advantages when compared to more frequently used softwares such as EMTP-ATP and MATLAB-Simulink. Description of the metal oxide varistor modelling at temporary and switching overvoltages, fast-front states, and lightning strokes is presented. More information about the defined internal structure of surge arrester models and ways for implementing respective V-I characteristics are provided. To verify the correct behaviour of the models, both slow and fast overvoltage scenarios are simulated and evaluated.

The Impact of Cross-Linking Effect on the Space Charge Characteristics of Cross-Linked Polyethylene with Different Degrees of Cross-Linking under Strong Direct Current Electric Field.

Cross-linked polyethylene (XLPE) obtained by the crossing-linking reaction of polyethylene (PE) can greatly enhance the mechanical properties and other properties of PE, which makes XLPE widely applied in the field of electric power engineering. However, the space charges can distort the distribution of the electrical field strength in the XLPE applied in the insulation materials, which can shorten the service life of the insulation materials. Therefore, the space charge characteristics of XLPE under the strong direct current (DC) electric field have been the focus of scholars and engineers all over the world. This article has studied the impact of the cross-linking effect on the space charge characteristics of XLPE with different degrees of cross-linking. For this issue, we used dicumyl peroxide (DCP) as the cross-linking agent and low-density polyethylene (LDPE) as the base material for the preparation of samples. Besides, the space charge distribution was measured by the pulsed electro-acoustic method (PEA). In addition, the average charge density as a characteristic parameter was introduced into the experiment, which was used to quantitatively analyze the impact of the cross-linking effect on the space charge characteristics of XLPE with different degrees of cross-linking. Meanwhile, we also explained the impact of the cross-linking effect on XLPE with different degrees of cross-linking from a microscopic point of view. Ultimately, some important conclusions can be obtained. For instance, the cross-linking effect significantly increases the threshold electrical field strength of XLPE, and as the content of cross-linking agent increases, the threshold electrical field strength increases at first and then decreases, and the threshold electrical field strength reaches the maximum value when the content of the cross-linking agent is 1.0% or 2.1%. Besides, the cross-linking effect introduces negative charge traps into the LDPE and increases the densities of the deeper charge traps, and so on. In addition, we have also analyzed the average charge density, and we have summarized the theoretical model of the average charge decay, namely, , which is very effective for explaining the dissipation characteristics (more conclusive contents can be seen in the conclusion section of this article).

Main Directions of the Russian State Energy Saving Policy in the Field of Electric Power Engineering

The article describes the issues of strategic planning and legal regulation of activities aimed at energy saving and energy efficiency in the Russian Federation. The authors set the goal to determine the directions for strategic planning of the energy saving policy of the Russian Federation based on a comparative legal analysis in order to achieve the goals of sustainable development of an energy­saving economy. The article considers advanced technologies designed to ensure the most effective implementation of the provisions of legal acts adopted in the last decade in Russia. The methodology of this scientific research is the use of hermeneutics, interpreting legal texts and application of formal logical instruments within the system analysis of current Russian strategic planning acts for long­term (medium­term) period to coordinate the activities of economic entities and public authorities in the appropriate direction. Besides, it includes normative acts that establish the legal, economic and organizational basis for stimulating energy conservation and improving energy efficiency as well as legal documents of other countries that determine their policies in this area. The authors come to the conclusion that it is required to consult various specialists, including ophthalmologists, when creating norms of Russian legislation in the field of energy saving; to account for technical and technological characteristics of LED (light emitting diode) modules, chips, other light sources; to take into consideration the possibility of their use in various fields in order to achieve energy efficiency.

SOCIAL MANAGEMENT AND PRIORITIES FOR DEVELOPMENT OF THE ELECTRICITY MARKET IN UKRAINE

The potential of development of the market of electric energy on the basis of social management is explored. It is substantiated that efficient functioning, as well as management of the development of the market of electric energy, is impossible without the formulation of new strategies that allow enterprises and organizations to better respond to the needs of consumers, partners, and society; based on the awareness of not only economic, but also social and environmental responsibility; based on the balance of interests of all interested parties; require finding common positive vectors for business and society development, and harmonizing the goals and objectives of the business with a view to making profit by solving social and environmental problems of the society. The possibility of applying the principles of social management in the market of electric energy has been studied taking into account possibilities of adaptation to the modern conditions of Ukraine of the world experience of implementation of innovative projects of social direction in the field of electric power engineering. The features and dynamics of indicators of functioning and development of the market of electric energy, in particular, the branch markets of alternative energy, renewable energy sources in the world and in Ukraine, for the purpose of revealing the socio-economic consequences of these processes for the states concerned and their citizens, are explored.

The Development of Ukrainian Electric Power Engineering Terminology: The “Golden Decade”

The objective of this work is to analyze the inception process of the Ukrainian electric power engineering terminology (UEPET). The task is to analyze one of the developmental stages of UEPET – the basis of the UEPE terminology system, known as the “Golden Decade”. In order to achieve this goal, we researched and outlined timelines of this stage in UEPET development, as well as analyzed the source and course of development and accession of UEPET during the aforementioned period.Research has shown that the second stage of UEPET formation took place during the 1920s and 1930s. Substantiation of UEPET occurred throughout this timeframe.The 1920s formed a decade of rapid evolution of electric power engineering in Ukraine. At that time, outstanding achievements of academic electric power engineers in connection with the emergence of new terminology caused a sudden demand for compilation and normalization of a national terminological system. At the beginning of 1925, the Technical Department of Ukrainian Academic Language established an electrical engineering section. This work attracted leading scholars, who created registers of terminology and also derived terms and lexical material from professional literature, dictionaries, and literary sources. UEPET formed at the beginning of the 1930s a conceptual terminological database, which reinforced a need for scholars. The lexicographical work of M. Darmoros, L. Darmoros, V. Dubrovskyi, K. Polonoskyi, F. Kalynovych, K.Turkalo, and other scholars, devoted to the terminology of other sectors, did not overlook the terminological lexicon that served the field of electric power engineering during this developmental phase. “Dictionary of Technical Terminology (General)” by I. Sheludko, T. Sadovskyi and “Dictionary of Technical Terminology (Electrical Engineering)” by I. Sheludko became the basis for modern UEPET. These works in terminography are, in our opinion, the greatest achievement in Ukrainian electric power engineering lexicography of the first half of the 20th century.

Application of Geographic Information System to Power Distribution System Analysis

This paper presents a new application of Geographic Information System (GIS) in the field of electric power engineering. GIS can analyze and visualize information related to Geography. Recently photovoltaic (PV) generation is introduced in the power system day by day for the needs of clean energy. If it is installed in large quantities, voltage variation occurs with a risk of worsening electric power quality. In this context the limit of introducing PV in the power system should be correctly grasped. This research focuses on distribution system with large amount of PV. In order to grasp the limit of introducing PV in the distribution system, PV generation should be evaluated correctly and analyze the state of the distribution system. Although PV generation is proportional to solar radiation, the amount of solar radiation is affected by the shadow of the building, the angle, and the direction. Therefore, it is difficult to grasp solar radiation falling on the PV panels accurately and calculate PV generation. GIS can solve the problem. GIS can model actual townscape and analyze the amount of solar radiation. By executing solar radiation analysis to the modeled townscape, the amount of solar radiation on any places in the town can be evaluated. Using the result of the analysis, PV generation installed on any places in the town can be estimated and more proper distribution system analysis can be performed than conventional analysis.