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The paper describes the distinctive features of the isolated power system of Tajikistan, significant part of which is constituted by the hydropower plants; identifies the main problems of the electric power system of the Republic of Tajikistan in terms of power generation; describes specific features of HPP cascade management; proposes a method of determining the alternative fully drawn down level...
Energy is one of the sectors directly affecting the economic growth and forming a significant part of overall expenses in several industry branches, especially in manufacturing. The development of the energy sector requires significant investments which can only be attracted in a stable and predictable investment environment. Therefore, Latvian energy sector is being planned in a long-term both globally...
With the global shift in economics the demand for the highly trained specialists is continuing to grow. Thus the next 50 years have the potential to become the golden age of higher education: more and more people are going to broaden their knowledge in different branches of their specialties and develop complex social skills in order to sustain cultural diversity and leadership. In the paper an overview...
The process of globalization poses new challenges for the government in the field of education system regulation. The growing importance of the need for a qualitative assessment of the state of the educational process contributed to the development of one of the new scientific directions — the issue of quality management of higher education. Despite the fact that a lot of publications have appeared...
The main negative factors of urbanization are both, environmental problems (pollution of the urban environment, increase of building density, decrease of the green area, etc.), and the destructive influence of the big city on human health (emotional discomfort and stress among inhabitants, mental overloads leading people to alienation from the urban environment, etc.). In the article a new hybrid...
Within the last two decades, increase in electricity demand and environmental concern resulted in fast growth of power production from renewable sources. Wind power is one of the most efficient alternatives. Therefore, the issue on integration of a new renewable power plant into the existing electrical power system(EPS) is the topical terms of stability. The goal of this paper is to ensure approach...
This paper examines the potential benefits smart and quickly controllable load can provide for transmission network congestion management if end-users give the transmission network operator or an independent aggregator service access to disconnect their devices in case of contingencies. The necessary amount of available quickly controllable load for the fulfilment of N-1 criteria is found for the...
Our work focuses on the problem of optimizing a cascade of three small hydro power plants. The optimization is based on deciding how much electricity to produce dependent on the day-ahead hourly electricity prices. The problem is reduced to controlling the water volumes in the cascade's reservoirs. We examine two approaches — linear programming based on Matlab's Simplex method (the Linprog function)...
Due to the advances in photovoltaic material research and solar panel price reduction over last years, the usage of this alternative energy source in northern countries seems more attractive. Usage of energy storage devices can help use the solar power more efficiently and smarter. This paper deals with the optimization of proposed solar panel array of renovated office building's communal lighting...
In most countries, electricity is bought and sold at regulated and non-regulated prices. Non-regulated prices are mainly set on the wholesale electricity market and can significantly increase during peak periods due to input of more expensive generation. Another problem, which leads to an increase in prices on the market, is to achieve the carrying capacity of certain sections that does not allow...
The electric power system (EPS) is exposed to small and large impacts during operation, such as changes of loads, commutation of circuit elements, changes of generation of active and reactive power, the impact of automation, (all of them are examples of normal relatively small disturbances), as well as short circuits, large load resets and load surge, unauthorized shutdown of equipment, work of protections...
The electric power system (EPS) is exposed to small and large impacts during operation, such as changes of loads, commutation of circuit elements, changes of generation of active and reactive power, the impact of automation, (all of them are examples of normal relatively small disturbances), as well as short circuits, large load resets and load surge, unauthorized shutdown of equipment, work of protections...
Stability of complex electrical power systems (EPS) is an important technical property, indicator of reliable and efficient operation of the EPS. The concept of stability can be divided into three types: the static, dynamic and resulting one. Static stability is the ability of the system to restore normal operation after minor perturbations, in its turn, dynamic and resulting stability is the ability...
Electric Power System (EPS) is continuously subjected to internal and external disturbances that cause changes in the operational parameters — the EPS response. Change in parameters depends on the type and magnitude of the disturbance, its application point (external factors), and the diagram and parameters of EPS elements (internal factors). The purpose of this paper is to provide methods for detection...
In the paper the application of Monte Carlo approach for random search algorithms to finding a pair of conjugated roots of a characteristic polynomial (ChP) is presented. The proposed technique is oriented only to ChPs with real coefficients. The search is produced on the basis of random numbers with uniform distribution in a rather narrow bounded region of the complex plane. Two search methods are...
The current stage of the world energy development is characterized by the creation of powerful territorial and integrated power systems. A gradual unification of the energy markets of different countries is currently going on within a free market: the configuration of networks has been changing, additional relations appear, new energy companies and unions are formed, a sector of renewable sources...
The market economy dictates the terms of unification of the energy systems of the countries that leads to a change in number of interconnections, the increase of the transmitted power, and therefore, it is necessary to reconfigure the networks and, consequently, the recalculation of their normal modes, as well as the project assessment of static stability is required. Stability is an important constraint...
The current stage of the world energy development is characterized by the creation of powerful territorial and integrated power systems. A gradual unification of the energy markets of different countries is currently going on within a free market: the configuration of networks has been changing, additional relations appear, new energy companies and unions are formed, a sector of renewable sources...
The market economy dictates the terms of unification of the energy systems of the countries that leads to a change in number of interconnections, the increase of the transmitted power, and therefore, it is necessary to reconfigure the networks and, consequently, the recalculation of their normal modes, as well as the project assessment of static stability is required. Stability is an important constraint...
The configuration of the electrical systems should be often changed in terms of market relations. Therefore, an actual necessity of an express evaluation of static stability of power systems appears. Criteria such as “Hurwitz”, “Rauss” are very cumbersome in use. Not only modification of the existing methods are examined and discussed in the paper, but also new ways of getting the evaluation of static...
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