scholarly journals Joint voltage and frequency predictive controllers for distributed generation plants

2021 ◽  
Vol 25 (5) ◽  
pp. 568-585
Author(s):  
Yu. N. Bulatov
Keyword(s):  
Quality Indicators ◽  
Distributed Generation ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Voltage Sag ◽  
Transient Time ◽  
Operating Modes ◽  
Supply Systems ◽  
Predictive Controllers

The paper determines the effect of proposed joint voltage and frequency predictive controllers for distributed generation (DG) plants on quality indicators characterizing the control process in different operating modes of power supply systems. The studies are conducted in the MatLab environment (Simulink and SimPowerSystems simulation packages) employing control engineering methods. It is proposed to design and adjust joint predictive controllers by determining the resonant frequency of oscillations for the master generator rotor. This approach provides better quality indicators of voltage and frequency control in power supply systems while maintaining the same settings for the controllers of DG plants. With an additional load in an isolated power supply system, the maximum voltage sag is found to be 1.75 times lower than for local predictive control and 3.5 times lower as compared to the use of conventional controllers. For the specified mode, predictive controllers enable a threefold reduction in the transient time between rotor rotational speeds in a synchronous generator. In the start mode of a powerful electric motor, the predictive controllers of synchronous generators in the power supply system enable a 1.5 times reduction in voltage sag, with a 1.4 times reduction in overvoltage following its start. In the case of a short-term three phase short-circuit, joint predictive controllers allow a 1.5 times decrease in transient time and a 2.3 times decrease in the overshoot of power line frequency as compared to local control. In addition, frequency oscillation in the power system is also reduced. Similar effects are observed in other operating modes of the considered power supply systems equipped with DG plants. The performed dynamic simulation confirms the effectiveness of using joint voltage and frequency predictive controllers for DG plants, which consists in a positive impact on the quality of processes involved in controlling the parameters of power supply systems in various operating modes.

scholarly journals Determination of the technical condition of electrical equipment in power supply systems

2021 ◽  
Vol 939 (1) ◽  
pp. 012014
Author(s):  
A Rakhmatov ◽  
N Rajabov ◽  
Kh Yakubova
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Electrical Energy ◽  
Electrical Equipment ◽  
Technical Condition ◽  
Supply System ◽  
Operating Modes ◽  
Quality Of Electrical Energy ◽  
Supply Systems

Abstract This article describes the methods and means for determining the technical condition of electrical equipment in power supply systems, particularly in transformer substations. There are many ways to determine the technical condition of electrical equipment. However, their implementation requires complex and additional equipment and devices. In addition, these tests must be carried out when the power supply system is off. This will lead to a decrease in the quality of electrical energy. Determination of the technical condition of electrical equipment using thermal imagers is performed under the voltage and in operating modes, the measurement process does not affect the parameters of the power supply system. The results of research in energy enterprises of the Syrdarya region are presented.

scholarly journals Research of Operation of Predictive Controllers of Distributed Generation Plant in Power Supply System with Energy Storage

2021 ◽  
pp. 448-458
Author(s):  
Yuri N. Bulatov ◽  
Andrey V. Kryukov ◽  
Konstantin V. Suslov
Keyword(s):  
Energy Storage ◽  
Distributed Generation ◽  
Power Supply ◽  
Power Supply System ◽  
Electric Energy ◽  
Synchronous Generator ◽  
Supply System ◽  
Storage Device ◽  
Energy Storage Device ◽  
Predictive Controllers

The article discusses the power supply system of an industrial enterprise, which included a turbine generator plant operating on the basis of a synchronous generator equipped with predictive voltage and rotor speed controllers, as well as a high-power electric energy storage device. A description of the models of this plant, predictive controllers and energy storage, as well as the results of modeling when the system goes into an isolated mode of operation are given. Simulation was performed in MATLAB environment using Simulink and SimPowerSystems packages. The purpose of the work was to study the behavior of the proposed predictive controllers during the transition of the power supply system to the island (isolated) mode. Based on the results of computer simulation, it was concluded that the use of predictive controllers improves the damping properties of the system. The use of an energy storage device that is automatically connected to the network when the voltage drops, allows to reduce the overvoltage at the terminals of the generator during its unloading, as well as to reduce the required mechanical power on the turbine shaft in comparison with a permanently connected device. Predictive controllers can be recommended to increase the stability of distributed generation plants when switching to an isolated mode. It is advisable to conduct further research in the direction of creating algorithms for coordinated operation of controllers

INCREASING THE EFFICIENCY OF UNDERGROUND MINING COMPLEXES APPLICATION BY IMPROVING THE POWER SUPPLY SYSTEM

2021 ◽  
Author(s):  
Oleksandr Ostapchuk ◽  
◽  
Andrii Bondarenko ◽  
Maryna Kyrychenko ◽  
◽  
...  
Keyword(s):  
Quality Indicators ◽  
Power Supply ◽  
Power Supply System ◽  
Underground Mining ◽  
Deep Level ◽  
Electricity Consumption ◽  
Supply System ◽  
Definition Of ◽  
Methods Analytical ◽  
Supply Systems

The aim of the study is to improve the quality of electricity and reliability of power supply systems of underground mining complexes of deep-level and power-intensive mines based on determining the optimal voltage class of highvoltage power lines. The subject of the research is the methods of quality indicators ensuring, reliability and safety of power supply systems of underground mining complexes of deep-level and power-intensive mines. Research methods. Analytical and calculation methods were used to solve the scientific problem to assess the nature and level of electricity consumption in modern deep-level and power-intensive mines; scientific generalization was used in determining the state of development of power supply systems of underground mining complexes of modern ore and coal mines; mathematical modeling was used in the description of processes in grids. The result of the study. The paper analyzes the current situation when choosing a rational voltage class in the underground power supply system of modern mining complexes was analyzed. Factors that have a direct impact on the efficiency of electricity consumers of deep horizons are identified. The method of power quality indicators calculation at definition of a voltage class of a certain mining horizon or the enterprise as a whole is offered. Prospects of application of voltage classes 6, 10 and 35 kV for power supply of shaft cables in the conditions of deep-level and power-intensive mines are considered. Conclusion. According to the obtained research results, it was established that the normalized voltage levels are far from the voltage values used today for the power supply lines of the underground power supply system, namely 6 and 10 kV

scholarly journals The study of the isolated power supply system operation with controlled distributed generation plants, energy storage units and drive load

2022 ◽  
Vol 23 (5) ◽  
pp. 184-194
Author(s):  
Yu. N. Bulatov ◽  
A. V. Kryukov ◽  
K. V. Suslov
Keyword(s):  
Control System ◽  
Energy Storage ◽  
Distributed Generation ◽  
Power Supply ◽  
Power Supply System ◽  
Supply System ◽  
Storage Unit ◽  
Energy Storage Unit ◽  
Operating Modes ◽  
Speed Controller

THE PURPOSE. Investigation of the operating modes of an isolated power supply system with controlled distributed generation plants, energy storage units and a drive load. Determination of the influence of the proposed prognostic controller of a distributed generation plant on the control parameters and quality indicators of the control process under various operating modes of an isolated power supply system.METHODS. The studies were carried out on a computer model of an isolated power supply system of an industrial enterprise with a turbine generator plant, a wind generator plant and a high-power electric storage unit, for which a fuzzy control system and a prognostic controller were used. The simulation was performed in MATLAB using Simulink and SimPowerSystems packages.RESULTS. The article describes a computer model of an isolated power supply system, as well as a structural diagram of the proposed autoprognostic speed controller. The simulation results showed that the combined use of an energy storage unit and an auto-prognostic generator rotor speed controller makes it possible to ensure the stability and survivability of an isolated power supply system, increasing its damping properties. The use of a fuzzy control system of a wind-generating plant made it possible to ensure its stable operation in all considered modes.CONCLUSION. The auto-prognostic speed controller, which does not require special settings, and the energy storage unit provide high quality control indicators in normal and emergency modes. It is advisable to conduct further studies to coordinate the actions of the control system of the electric energy storage unit and the auto-prognostic speed controller of the distributed generation plant.

scholarly journals The Efficiency of Distributed and Centralized Power System Integration

2019 ◽  
Vol 114 ◽  
pp. 05007 ◽  
Author(s):  
Felix Byk ◽  
Yana Frolova ◽  
Ludmila Myshkina
Keyword(s):  
Power Systems ◽  
Power System ◽  
Distributed Generation ◽  
Power Supply ◽  
Power Plants ◽  
Power Supply System ◽  
Supply System ◽  
Technical Solution ◽  
Local Power ◽  
The Impact

The existing centralized power supply system has the alternative due to distributed generation. By certain conditions distributed cogeneration allows to increase the reliability and quality of power supply and to reduce the cost of electricity for consumers. Therefore, a lot of energy-intensive consumers switched to their own power supply systems, as it turned out to be a competitive technical solution. The total gasification of the country’s regions and the presence of domestic manufacturers of gas turbine and gas piston power plants accelerated this process. Nowadays local power systems are emerging with cogeneration plants are the main source of heat and electricity there. The feasibility justification of the kind and type of generation is determined by many factors, including circuit-mode parameters in the local power system and adjacent network. Local power systems based on the principles of self-balance are proposed to name as energy cells. The integration of energy cells with regional power system increases the technical and economic effectiveness of power supply system for consumers. The proposed power systems transition leads to certain systemic effects. Received effects are depending on functions of distributed generation. This paper explores the impact of scheme and mode factor on the technical effects.

scholarly journals Measurement of currents and voltages non-sinusoidal parameters in power supply systems with rectifier load

2018 ◽  
Vol 245 ◽  
pp. 06007 ◽  
Author(s):  
Valery Vanin ◽  
Alexandr Bulychov ◽  
Maxim Popov ◽  
Olga Vasilyeva ◽  
Maria Shakhova
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Negative Impact ◽  
Supply System ◽  
Municipal Services ◽  
Quality Indices ◽  
Electric Drives ◽  
Traction Substation ◽  
Railway Traction ◽  
Supply Systems

The use of frequency-controlled electric drives in industry and municipal services is accompanied by the problem of their negative impact on the distribution network. As examples, the results of measurements of power quality indices in the power supply system of an oil producing enterprise and on the supply input of a railway traction substation are given. It is shown that the voltage subgroup total harmonic distortions (THDS) can exceed their rated permitted values in 100% of the measurement time.

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