Abstract
The work is devoted to solving the problem of optimizing the flow of reactive energy in electric grids (EG) of electric supply companies (EC). The object of research is the process of transportation and distribution of electric power by electric grids of UES. The subject of the research is methods and means for optimizing the flow of reactive energy in such grids. One of the most problematic locations for the EG operation is ensuring their energy efficiency in the face of constant changes in consumption and generation of electricity. It is known that the most effective measure to reduce power losses in the EG is the introduction of measures to optimize the flow of reactive energy. However, in order to optimize the location of additional reactive power sources (RPS), it is necessary to solve the problems of non-linear multifactor optimization, which is associated with a number of problems. On the basis of the research it is shown that to optimize the RPS location it is expedient to use the results of modeling «ideal» EG modes for reactive power based on equivalent circuits with active supports. The economic costs associated with the installation and operation of the RPS, it is suggested to list the EG equivalent circuit in the corresponding economic supports. Mathematical relations for economic resistance of established RPSs are developed, as well as the optimization task to be determined based on the results of the solution. Application of this approach, unlike classical methods, significantly shortens the calculation time and allows obtaining a solution close to the global minimum of production costs. The computational efficiency and reliability of the approach is ensured by the construction of the task of multifactorial optimization of the flow of reactive energy in the design setting in the iterative calculation of the «ideal» EG mode according to the appropriate equivalent circuit and loads. The program implementation allows to confirm the effectiveness of the proposed approach for a number of practical problems. It is shown that the solutions obtained for optimizing the RPS distribution in grids bring the profitability of investments to a global maximum closer, regardless of the size of the problem and a list of constraints on the parameters.
Highlights
Modern electric grids (EG) of energy supply companies (EC) should provide reliable and efficient energy supply to consumers, as well as transportation of distributed energy sources (DES)
The tasks of improving the structure and parameters of EG should be solved in such way that the formation of design solutions, in particular the connection and operation of reactive power sources (RPS), which is linked to the effective operation of existing electric units
Based on the research results, a new solution to the problem of increasing the efficiency of control of reactive power flows in EGs is obtained, which consists in deve loping, based on the principle of least action, a method and algorithms for optimizing the location of additional reactive power sources
Summary
Modern electric grids (EG) of energy supply companies (EC) should provide reliable and efficient energy supply to consumers, as well as transportation of distributed energy sources (DES). In addition to the EG reconstruction and the modernization of their main equipment, they acquire the urgency of research in the direction of improving the structure and methods of managing their modes [1] To solve this problem, the principles of building mo dern electric power systems must correspond to the general progress of technics and technology [2]. Proceeding from this, in modern conditions the setting of optimization problems related to the distribution of reactive energy, as well as their dimensionality, is changing This can lead to ineffectiveness of classical methods for their solution. An alternative is placement of the RPSs and optimization of their parameters in order to bring the state of the electric grid closer to the «ideal» one for power losses [3]. The use of PLA makes it possible to obtain a new method for optimizing the location of reactive power sources in electric grids by the criteria of minimum energy losses and the maximum return on investment
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