Tulkin Gayibov - Academia.edu (original) (raw)

Papers by Tulkin Gayibov

AIP conference proceedings, 2024

EurasianUnionScientists, 2019

АННОТАЦИЯ В статье рассматривается вопросы учета ограничений в виде неравенств при оптимальном пл... more АННОТАЦИЯ В статье рассматривается вопросы учета ограничений в виде неравенств при оптимальном планировании краткосрочных режимов энергосистем. Предложен эффективный алгоритм решения задачи. На основе расчетных экспериментов для конкретных задач оптимального планирования режимов энергосистем выявлена эффективность предложенного алгоритма. ABSTRACT In the article the issues of taking into account of constraints in the form of inequality in optimal planning of short-term modes of power systems are considered. An efficient algorithm for solving of the problem is offered. On the basis of computational experiments for specific problems of optimal planning of modes of power systems the efficiency of the proposed algorithm is revealed. Ключевые слова: оптимизация, ограничение, целевая функция, информация, неопределенная информация, оптимальное планирование.

IOP Conference Series: Earth and Environmental Science, 2020

The problem of optimization the modes of electrical networks pro- vides determination the optimal... more The problem of optimization the modes of electrical networks pro- vides determination the optimal values of reactive power of sources, voltages of reference nodes and transformation ratios of controlled transformers. At pre- sent, methods and algorithms for optimization of reactive power and node volt- ages are sufficiently developed. However, the development of new efficient optimization algorithms of transformation ratios remains as a important topic. In this case, the issues of optimization of transformation ratios of transformers included in closed networks have a particular importance. This paper provides an effective algorithm for optimization the modes of electrical networks on transformation ratios of controlled transformers. The results of research of its efficiency in the presence of transformers with phase-rotary and longitudinal control in the circuit are presented. It is shown that minimization of losses in closed electrical networks when optimizing transformation ratio...

Currently, many enterprises are installing their own stations for generating electricity based on... more Currently, many enterprises are installing their own stations for generating electricity based on solar and wind energy, which may have batteries. At the same time, part of the consumed electricity by the enterprise during the day can be taken from the electric power system (EPS). Changing the electricity tariff during the day sets the task of determining the optimal load schedules of such consumers relative to EPS. In the existing literature, mathematical models and solution methods which can be used to determine the optimal schedules of power consumption from EPS and power output by the own station, taking into account their characteristics are not found. In this paper, we propose a mathematical model and an algorithm for solving the problem of optimization of load schedules for consumers with their own stations based on renewable energy resources, taking into account the capabilities of batteries. The results of evaluation the effectiveness of proposed model and algorithm are given.

THE THIRD INTERNATIONAL SCIENTIFIC CONFERENCE CONSTRUCTION MECHANICS, HYDRAULICS AND WATER RESOURCES ENGINEERING (CONMECHYDRO 2021 AS)

The problem of selecting the optimal composition of operating units in power plants when planning... more The problem of selecting the optimal composition of operating units in power plants when planning short-term modes of power systems is a complex problem of nonlinear programming. Its solution usually boils down to determining the starting or stopping units in power plants for each interval of the planning period. Despite the current existence of many methods and algorithms for solving this problem, the issues of their improvement in the direction of increasing the accuracy of calculations and the reliability of convergence of iterative process, taking into account the new conditions of the functioning of power systems, as well as the capabilities of modern computing facilities, remains as an important task. In this paper, we propose a new algorithm for the selection of the composition of operating units in power plants based on a genetic algorithm, which, to a certain extent, meets modern requirements. The solution to the problem is carried out in two stages. At the first stage, generalized energy characteristics of the plants participating in the optimization are constructed. At the second stage, based on optimal coverage of the power system load schedule by all plants according to their obtained generalized energy characteristics taking into account all limiting factors, by the genetic algorithm, the optimal compositions of the operating units are determined. High accuracy of the result is ensured by the direct use of energy characteristics of plants, usually set in a tabular form, and the ability of the genetic algorithm to solve multiextreme problems without any simplifications. The results of computational experiments, which confirm the high efficiency of the proposed algorithm, are presented.

IOP Conference Series: Materials Science and Engineering, 2020

The task of power systems mode optimization relates to the complex tasks of non-linear mathematic... more The task of power systems mode optimization relates to the complex tasks of non-linear mathematical programming. Despite the development over the past few decades many methods and algorithms for solving this problem, questions of their improvement taking into account the current operating conditions of energy systems remain an important task. This article proposes a new algorithm for the optimization of short-term modes of power systems, taking into account frequency changes in terms of the probabilistic nature of initial information. A distinctive feature of the algorithm is associated with the elimination of the need to choose the single slack bus with balancing power plant in calculations, which is typical for many existing methods. It is shown that taking into account frequency change in the optimization of power system mode in terms of probabilistic nature of initial information can introduce significant changes in the calculation results and lead to a corresponding increase in...

THE THIRD INTERNATIONAL SCIENTIFIC CONFERENCE CONSTRUCTION MECHANICS, HYDRAULICS AND WATER RESOURCES ENGINEERING (CONMECHYDRO 2021 AS)

Optimizing modes of the modern power system on active power is a complex problem of nonlinear mat... more Optimizing modes of the modern power system on active power is a complex problem of nonlinear mathematical programming. Despite the existence of many methods and algorithms for solving this problem, the issues of their improvement in the direction of correctly taking into account the factors that affect the regime remains an important problem. One of such factors is functional inequality constraints. The paper presents a new algorithm for optimising the modes of power system, taking into account losses in networks and functional constraints in the form of inequalities on power flows of controlled power transmission lines (PTL). A characteristic feature of the algorithm is taking into account the losses in branches by transferring them to the nodes of the electrical network. The algorithm's efficiency is investigated by the example of optimization of the mode of a complex electric power system with four thermal power plants participating in the optimization, ten PTL, in two of which the active power flows are controlled. In this case, the power flows in the controlled lines are determined by linearized formulas using the power distribution coefficients of the nodes. The economic effect on the total fuel consumption due to the use of the proposed algorithm is 0.45%.

RUDENKO INTERNATIONAL CONFERENCE “METHODOLOGICAL PROBLEMS IN RELIABILITY STUDY OF LARGE ENERGY SYSTEMS” (RSES 2021)

The problem of power system mode optimization taking into account losses in electrical networks a... more The problem of power system mode optimization taking into account losses in electrical networks and constraints on power flows in power transmission lines (PTL) is a complex problem of nonlinear programming. In general case, it is associated with a large number of different-scale variables, simple and functional constraints in the forms of equality and inequality, the different nature of the initial data on the state of the system and complex dependencies between parameters. Therefore, despite the existence of many methods and algorithms for solving of this problem, the issues of their improvement in the direction of increasing the efficiency due to more accurate accounting of limiting and influencing factors remains as an important problem. This paper presents a new algorithm for optimization of modes of power systems taking into account functional constraints in the form of inequality on active power flows in controlled PTL and losses in electrical networks. It characterized with the calculation of active power flows in controlled transmission lines by their expression, using the circuit and operating parameters of the electrical network, as well as taking into account losses without calculation of their derivatives. The results of experimental calculations carried out for a power system, which have four settlement thermal power plants, taking into account the network factor, are presented. They show that the use of the proposed algorithm can significantly increase the efficiency of optimization by increasing the accuracy of accounting of losses in electrical networks and power flows in controlled PTL.

E3S Web of Conferences, 2019

In the article the problem of power system optimization under partial uncertainty of initial info... more In the article the problem of power system optimization under partial uncertainty of initial information is considered. The possibilities of using the methods of determinization to solve the problem of power system optimization taking into account the regime and technological constraints in the form of equality and inequality are researched. In basis of performed calculation studies using the example of the test scheme of power system, it was found that the optimization algorithm by the method of determinization can be effectively used for this proposes.

Proceedings of the 2011 3rd International Youth Conference on Energetics, Jul 7, 2011

The effective mathematical algorithm of Power Systems short period regimes optimization on active... more The effective mathematical algorithm of Power Systems short period regimes optimization on active power is offered. It provides solving the mathematical task of optimization through short-linear approximation of nonlinear characteristics of power stations and functions of limitation and using the linear programming methods. Here also the research results are presented. It confirms that the offered algorithm has reliable iterative process convergence and high accuracy. The offered algorithms using for optimal planning of big Power Systems regime provides significantly decrease the calculation time and energy resource expenses in power stations.

E3S Web of Conferences, 2019

The issues of improving of methods and algorithms for power system short-term mode optimal planni... more The issues of improving of methods and algorithms for power system short-term mode optimal planning are considered. The main disadvantages and calculation difficulties typical for traditional algorithms are described. An effective algorithm for power system mode optimization based on a piecewise- linear approximation of nonlinear dependencies is proposed. Application of the proposed algorithm can effectively increase the accuracy and overcome many calculation difficulties associated with discontinuity of energy characteristics of power plants and various constraints in the form of equality and inequality.

E3S Web of Conferences

At present, one of the most important issues at the level of various manufacturing enterprises is... more At present, one of the most important issues at the level of various manufacturing enterprises is the development of ways for building and efficiently using renewable energy sources, especially solar energy. In this regard, this article proposes a mathematical model of the problem of determining the optimal daily mode of operation of a photovoltaic system in an enterprise with a private photovoltaic system connected to the electrical system. The effectiveness of the mathematical model was analyzed on the example of determining the optimal mode of operation of the photovoltaic system located on the territory of Jizzakh Polytechnic Institute. It is shown that the mathematical model can be used to determine the optimal operating modes of existing photovoltaic systems in enterprises and distribution networks, as well as to determine the optimal parameters in their design.

E3S Web of Conferences

Over the past decades, many publications on the use of genetic algorithms, which offer a new and ... more Over the past decades, many publications on the use of genetic algorithms, which offer a new and powerful approach for solving the problem of power system mode optimization, have appeared. Despite this, the issues of effectively taking into account various constraints when solving such problems with genetic algorithms remain opened. In this regard, this article proposes an algorithm for optimizing power system modes by genetic algorithm, taking into account functional constraints in the form of equalities and inequalities by various penalty functions. The results of effectiveness research of the given algorithm in the example of optimization of 8-nodal power system with four thermal power plants and three lines with controlled power flows are presented.

Optimal planning of short-term modes of power systems is a complex nonlinear programming problem ... more Optimal planning of short-term modes of power systems is a complex nonlinear programming problem with many simple, functional and integral constraints in the form of equalities and inequalities. Especially, the presence of integral constraints causes significant difficulties in solving of such problem. Since, under such constraints, the modes of power system in separate time intervals of the considered planning period become dependent on the values of the parameters in other intervals. Accordingly, it becomes impossible to obtain the optimal mode plan as the results of separate optimization for individual time intervals of the period under consideration. And the simultaneous solution of the problem for all time intervals of the planning period in the conditions of large power systems is associated with additional difficulties in ensuring the reliability of convergence of the iterative computational process. In this regard, the issues of improving the methods and algorithms for optim...

Many existing methods and algorithms for optimization of short-term modes of power systems provid... more Many existing methods and algorithms for optimization of short-term modes of power systems provide in calculations the introduction of a slack bus station, which ensures the balance of active power and, accordingly, the permissible frequency. In cases where the real load deviates from the planned one, determined by forecasting, the power system mode may turn out to be not optimal, and sometimes even not acceptable. This factor is especially noticeable in conditions of partial uncertainty of initial information about loads of nodes. To overcome this problem, planning of power system mode should be carried out taking into account the frequency change and, accordingly, the regulatory capabilities of all stations.This paper proposes an algorithm for optimization of modes of power systems in terms of partial uncertainty of initial information about loads, taking into account the frequency change. On the basis of computational experiments using the proposed algorithm, it is shown that tak...

E3S Web of Conferences

Based on the improvement of existing algorithms, an effective algorithm and program for taking in... more Based on the improvement of existing algorithms, an effective algorithm and program for taking into account the network factor have been developed for optimal planning of short-term modes of power systems with control of the load of power consumers, based on the restructuring of the dependences of the relative gains of losses on the power of nodes with settlement stations and regulated power consumers. As a result, it is possible to determine the optimal short-term modes of power systems, taking into account the network factor in terms of load management of power consumers.

E3S Web of Conferences

Many existing methods and algorithms for optimization of short-term modes of power systems provid... more Many existing methods and algorithms for optimization of short-term modes of power systems provide in calculations the introduction of a slack bus station, which ensures the balance of active power and, accordingly, the permissible frequency. In cases where the real load deviates from the planned one, determined by forecasting, the power system mode may turn out to be not optimal, and sometimes even not acceptable. This factor is especially noticeable in conditions of partial uncertainty of initial information about loads of nodes. To overcome this problem, planning of power system mode should be carried out taking into account the frequency change and, accordingly, the regulatory capabilities of all stations. This paper proposes an algorithm for optimization of modes of power systems in terms of partial uncertainty of initial information about loads, taking into account the frequency change. On the basis of computational experiments using the proposed algorithm, it is shown that ta...

Современные тенденции развития физики полупроводников: достижения, проблемы и перспективы

E3S Web of Conferences

Optimization of modes of electrical networks provides for the determination of rational values of... more Optimization of modes of electrical networks provides for the determination of rational values of reactive powers of controlled sources, voltages of reference nodes and transformation coefficients of adjustable loop transformers, at which the minimum costs associated with the production, transmission and distribution of electricity are ensured and all the specified operating and technological constraints are met. As a result of a lot of work performed by specialists from all over the world on the development of methods and algorithms for optimization the modes of electrical networks, at present, the methods for optimization of reactive powers and voltages of nodes are quite developed. At the same time, the algorithms for optimization of transformation coefficients of transformers, taking into account the provision of permissible voltage levels and minimum energy losses in closed electric networks by ensuring the optimal distribution of power flows in them, requires corresponding imp...

AIP conference proceedings, 2024

EurasianUnionScientists, 2019

IOP Conference Series: Earth and Environmental Science, 2020

THE THIRD INTERNATIONAL SCIENTIFIC CONFERENCE CONSTRUCTION MECHANICS, HYDRAULICS AND WATER RESOURCES ENGINEERING (CONMECHYDRO 2021 AS)

IOP Conference Series: Materials Science and Engineering, 2020

THE THIRD INTERNATIONAL SCIENTIFIC CONFERENCE CONSTRUCTION MECHANICS, HYDRAULICS AND WATER RESOURCES ENGINEERING (CONMECHYDRO 2021 AS)

RUDENKO INTERNATIONAL CONFERENCE “METHODOLOGICAL PROBLEMS IN RELIABILITY STUDY OF LARGE ENERGY SYSTEMS” (RSES 2021)

E3S Web of Conferences, 2019

Proceedings of the 2011 3rd International Youth Conference on Energetics, Jul 7, 2011

E3S Web of Conferences, 2019

E3S Web of Conferences

Many existing methods and algorithms for optimization of short-term modes of power systems provid... more Many existing methods and algorithms for optimization of short-term modes of power systems provide in calculations the introduction of a slack bus station, which ensures the balance of active power and, accordingly, the permissible frequency. In cases where the real load deviates from the planned one, determined by forecasting, the power system mode may turn out to be not optimal, and sometimes even not acceptable. This factor is especially noticeable in conditions of partial uncertainty of initial information about loads of nodes. To overcome this problem, planning of power system mode should be carried out taking into account the frequency change and, accordingly, the regulatory capabilities of all stations. This paper proposes an algorithm for optimization of modes of power systems in terms of partial uncertainty of initial information about loads, taking into account the frequency change. On the basis of computational experiments using the proposed algorithm, it is shown that ta...

Современные тенденции развития физики полупроводников: достижения, проблемы и перспективы

E3S Web of Conferences