PNRPU Bulletin. Electrotechnics, Informational Technologies, Control Systems

Decarbonizing the World’s Economy is one of the most urgent tasks. In particular, the reduction in the use of hydrocarbon resources in favor of renewable energy sources stands out among the ways to achieve carbon neutrality in the electricity industry. However, the introduction of such distributed generation units into the electric power system impacts the parameters of its operation. The nature of this influence should be studied and taken into account. Purpose: development of an algorithm for determining the optimal size and capacity of distributed generation unit in accordance with the impact on the mode parameters of the electric power system and analysis of the software implementation results of this algorithm. Methods: the algorithm developed by the authors for determining the optimal parameters of the generation unit based on an iterative method for calculating flows and power losses through power lines of the studied scheme and bubble sorting method. Results: the dependence of the solution to this optimization task for the same studied scheme on the formation of design conditions, in particular, on the imposed restrictions on the field of possible solutions, determined both the parameters of the generation unit and the power system as a whole was found. Practical relevance: the use of the developed algorithm in the design of a new distributed generation unit will make it possible to choose the best option for connecting this unit to the network while ensuring minimum operating costs.

Reactive power in the network is an undesirable phenomenon. Its circulation through the wires causes heat losses in the volume of about 10 % of its value. To reduce it, expensive static and dynamic compensators are used. Purpose of the study: to assess the effect of a cascade of transformers on reactive power in the network with a symmetrical load. Methods: in this work, electrical calculations are used. A substantially idealized circuit for connecting the secondary windings of a transformer to a symmetrical inductive load is considered. Active components of resistances are not considered. The rotating magnetic field is generated by primary windings (not shown). Reactive power is not transmitted to the network (hypothetically). Results: It was found that under the specified conditions, any phase is a source of reactive power of the other two phases. Conversely, any two phases are the source of the third phase reactive power. Thus, for the considered circuit (the external network is disconnected) with a symmetrical load, reactive power self-compensation occurs. A cascade of transformers is represented by their simplified equivalent circuits (excluding scattering). Active resistances are not considered. The idealization of this circuit is less than the first, since the reactive power of the second and third transformers is transferred to the primary winding. If the transformers are identical, then the reactive power flow from the load is divided between them into equal parts. Therefore, the flow of reactive power in the outer section is three times less than in the inner section. In accordance with this, in a real network, with an increase in the number of transformer substations, the flow of reactive power decreases significantly with distance from the load. Practical significance: the results can be useful in the development of means for reactive power compensation in networks.

The modern economy digitalization and the introduction of intelligent systems in various fields, including in the electric power industry, needs for technologies for working with various information for making management decisions. Ensuring the reliability and efficiency of power grid facilities operation, therefore, requires the use of mechanisms for the electrical equipment complex assessment based on relevant information about its condition. Purpose: description of the principles of a complex assessment of the electrical equipment condition using the technology of intelligent analysis of data obtained in the course of non-destructive control of its key elements. Methods: a systematic approach to managing the electrical equipment technical condition based on the results of non-destructive control of its elements and intellectual analysis of the data obtained was proposed. A variant of constructing models for a complex assessment of the equipment condition using a hybrid neuro-fuzzy technology was considered. Results: a model of a proactive control system for the equipment condition was proposed. The approach implies the selection and use of various methods of intelligent analysis of information about changes in its key diagnostic parameters and the formation of prompt and reliable decisions when planning maintenance and repair. A technique for constructing neuro-fuzzy models was proposed to determine the actual and predicted equipment condition, including procedures for their adjustment and adaptation to changing trends in its operation. An example of constructing models for the problem of a complex assessment of the power oil-filled transformers condition was given. A base of fuzzy rules, which makes it possible to analyze the presence of typical defects in transformer equipment has been formed. The tuning and testing of models was carried out using data from oil production facilities and the results of simulation. Practical relevance: it has been shown that the solutions obtained make it possible to determine the class of equipment condition with an error of no more than 10 %, as well as improve the result when new data is received from the non-destructive control system. Therefore there is a possibility to use the proposed approach for building an effective control system for the equipment operation process, based on technologies of integrated logistics support.

The constantly increasing demand for energy resources has led to an increase in the volume of oil produced, therefore, there is a need to use automated technologies in its production; in the development of new devices, in the improvement of the design of pumping equipment and electric drives of a new generation for rodless electric pumping units. The article discusses the possibility of using a new generation of oil equipment - a submersible rodless electric pump unit, which interacts with digital programmed control. Thus, the problem with wedge-shaped wear of pipes and rods on pumping units is solved. Purpose of the study: to investigate the possibilities of increasing the profitability of marginal oil production wells by using a cylindrical linear valve motor as part of an oil-producing unit. Methods: based on the results of a comparative analysis of a pumping unit with a plunger rod pump and a submersible rodless electric pump unit, calculate a cylindrical linear valve motor in the MAthCAD software environment, using classical methods of electromagnetic calculations. Results: analysis of research results confirmed the feasibility of using in practice an alternative rodless method of oil production from marginal wells instead of the known pumping units. The validity of using a cylindrical linear valve motor as part of such a unit has also been confirmed. The proposed method would solve the problems with the wear of pipes and rods, as well as with environmental pollution. Practical significance: a submersible rodless electric pump unit has smaller overall and installation dimensions, increases efficiency, therefore, such a unit makes it possible to very efficiently extract oil not only from conventional, but also from marginal, deep, inclined, horizontal wells, as well as in shallows and offshore oil fields.