State Of Electrical Network Research Articles

ОРГАНІЗАЦІЙНО-ЕКОНОМІЧНІ СКЛАДОВІ ПРОГРАМ РОЗВИТКУ ЕЛЕКТРИЧНИХ МЕРЕЖ

In the article researched the indicators that directly depend on the state of electrical networks. The first of them is the level of reliability of electricity supply, the indicators of which are the SAIDI and SAIFI indices. The domestic indicators of the specified indices significantly exceed the level in the countries of the European Union and to date have no signs of a decrease. Plans for reducing the indicator SAIDI have been analyzed in relation to the method of incentive tariffs for operators of distribution systems. The next considered indicator is high technological losses of electrical energy. It was analyzed that the volume of these losses has a growing trend and also significantly exceeds the average European level. The main reason for these phenomena is the outdated and worn-out condition of electrical grids, which, given the damage caused by missile strikes and shelling, tends to worsen. Proposals have been identified that in the future may help improve the condition of grids and eliminate a number of problematic phenomena Their main problems and approximate volumes of priority grids modernization were summarized. Possible practical measures aimed at helping to reduce technological losses of electricity are considered. The structure of the proposed traditional measures necessary to manage the development of networks and consumers were analyzed. It has also recently started in Ukraine development and approval of a set of documents which are directed to the implementation of the Energy Transition scenario and the implementation of the Smart Grid concept. The further need for the development of system and program documents at both the state and regional levels was identified. It is proposed to include in these documents a number of organizational and economic components which will most effectively contribute to the achievement of the set goals.

Time-alignment of electrical network measurements through time series of cycle RMS values

The distributed measurement of voltages and currents throughout an industrial plant is critical and necessary in order to have surges and/or meaningful events happening on different locations properly correlated and analysed. This provides a broad and integrated view of the plant’s electrical network state. In a distributed measurement environment, several meters are used simultaneously and the proper time-alignment is often mandatory. The time-alignment technique proposed in this paper takes advantage of the network’s own voltage signal characteristics. The voltage profiles of every electrical network present unique signature, characterized by the variations on the voltage magnitude provoked by the stochastic switching of different load types, complementing the voltage amplitude fluctuation from the power utility connection. Taking advantage of such dynamic, this work will introduce the rmsSync (RMS time-alignment synchronization technique), capable of providing a time-alignment for measurements taken by different equipment without the need of additional synchronization methods. The technique is based on the classic cross-correlation function applied to time series, which is not applied over the instantaneous signal voltage values, but over the RMS values time series, calculated on a cycle basis. Simulations and experiments show the sturdiness of the proposal, which has great applicability to any measurement system that requires time-alignment method.

Study of statistical data on the composition of electric distribution networks on the example of a Kaluga region district

Sustainable operation of the power grid complex is impossible without reliable and high-quality operation of 10/0.4 kV electrical distribution networks, which are the final link in the system for providing consumers with electric energy and are in direct interaction with a specific consumer. The study of statistical information on the composition of distribution networks makes it possible to draw conclusions about electrical network state, to implement recommendations for their development and to compare distribution electrical networks in different regions. This information is especially relevant for analyzing the reliability of power supply to consumers connected to the considered electrical distribution networks. Such indicators of network structure as the length of electric transmission lines of different voltages and power transmission schemes are studied. It also analyzes the number of damages in networks, the causes of these damages, data on the time of planned and emergency outages. This paper considers the structure of 10/0.4 kV electrical distribution networks located on the territory of one of the districts of the Kaluga region. The sample for distribution networks was: 1190 overhead transmission lines and 536 transformer substations. Consumers in the district are 21671 subscribers of individuals and 1986 subscribers of legal entities, that is, a total of 23657 metering points. On the lines of 0.4 kV and 10 kV, the percentage of their isolated design was revealed. The share of single-transformer and two-transformer versions of transformer substations is analyzed.

Estimation of prospects of use of alternative sources of energy for power supply mining enterprises of Russia

The article is devoted to assessing the prospects of alternative and renewable energy sources – wind power and solar power mining enterprises of Russia. The relevance of this assessment is that a new, untapped mineral deposits often located in remote and inaccessible areas and, during development, of the difficulty of supplying electric energy. The article presents the analysis of the limiting factors in the use of alternative and renewable energy sources in different regions of Russia – natural conditions, the volume of capital investments, the cost of electricity. An important advantage of self-generating energy installations that use alternative and renewable sources of energy is the savings in operating costs associated with a lack of purchase power, independence from the electricity supply, the state of electrical networks, ecological clean production of electricity. The article evaluated the feasibility of using wind energy and solar power projected Mining on one of the fields of the Republic of Sakha (Yakutia). The necessity of comparison of traditional and alternative methods of power supply was due to the high cost of electric power and a large enough cost of construction power line of necessary length and of stepdown substation. For assess the feasibility of constructing installations using wind and solar energy within the framework of this article, an analysis is given of the change in the final indicators of economic efficiency in the framework of the investment project for the construction of the entire projected mine. In the article the calculation of the parameters, settings, using alternative and renewable sources of energy, which could fully meet the needs of all departments of the GOK’s electricity.

Research of Bus Protection Based on Support Vector Machine with Parameter Optimization

Bus reliability is essential for maintaining the steady state of electrical network in power plants and power transformer stations. Researches on techniques and methods to achieve highly reliable and intelligent bus protection are very important. A new bus protection method based on parameter optimization of the support vector machine (SVM) is provided in this study. Various types of fault data were collected and used as samples for sorting comparison and analysis of different bus faults. Data were obtained by comparing the SVM method with the artificial neural network (ANN) method. The results suggest that the SVM model using RBF kernel can better distinguish among bus normal operation and different bus fault types than the ANN model, and meet the precision requirements for bus protection.