Decomposition model for examination and optimization of reliability of the basic structure of UES of Russia

2021 ◽  
Vol 14 (1) ◽  
pp. 4-19
Author(s):  
V. A. Nepomnyashchiy
Keyword(s):  
Power Supply ◽  
National Economy ◽  
Electric Energy ◽  
Energy Systems ◽  
Power Grids ◽  
Load Shedding ◽  
Annual Growth ◽  
Economic Losses ◽  
Annual Average ◽  
Reliability Of Operation

The main provisions are outlined of the author’s model of electric energy systems and their associations (Unified Energy Systems of Russia, UPS), enabling to determine analytically the key parameters of reliability of operation of EES within generation facilities (generation adequacy) and trunk power grids (transmission reliability) subject to dislocation of generation facilities and electric loads, electric modes and reliability of operation of trunk power grids.For calculations of electric modes of operation of 750–220 kV power grids, Stott’s decomposition method is used involving simplification of the Jacobian matrix, the latter being divided into two independent subsystemsP → δ and Q → U, based on a weak functional link between P and Uand between Q and δ. When developing the model, much attention has been paid to improving the correctness in assessing the static and dynamic stability of the UES and taking into account these factors in the process of calculating the reliability of trunk power grids networks for each of the considered emergency situations. Special attention has been paid to improving the accuracy of estimates of economic losses (damage to the national economy) under various conditions of operation and recovery of UES: when working at low frequency, on actuation of automatic frequency load shedding (AFLS) devices and special load shedding automatics (SLSA), in case of sudden shutdowns, shutdowns with prior notice, and planned power supply restrictions. When forming the composition of consumers subject to restrictions, instead of the currently used proportional approach, the method of indefinite Laplace multipliers is used to reduce damage, based on taking into account the technological and economic response of various types of consumers to restrictions of their electrical loads. The calculations are concluded with an assessment of the annual average undersupply of electric energy and economic damage to consumers from disruptions of their power supply for the UES of Russia in 2017–2019, as a basis for optimizing the system reliability. It is shown that the probable annual average damage only in trunk grids of the UES of Russia amounts to as much as 1.2 percent of annual GDP, while its annual growth over the same period is estimated by the Ministry of Economic Development and the State Statistics Committee of the Russian Federation to be within 1.8%. Thus, due to the unreliability of the operation of only 750–220 kV main nets of UES, the national economy annually loses up to 2/3 of its annual growth.

scholarly journals CLASSIFICATION OF POWER NETWORK ELEMENTS ON RELIABILITY-RELATED ASPECTS IN THE ASTRAKHAN REGION (ON THE EXAMPLE OF “ASTRAKHANENERGO” - A BRANCH OF PJSC “IDNC OF THE SOUTH”)

2019 ◽  
pp. 48-56
Author(s):  
Aislu Muratovna Kubenova ◽  
Sergey Vladimirovich Golovko
Keyword(s):  
Power Supply ◽  
Large Scale ◽  
Network Reliability ◽  
Electric Energy ◽  
Poor Quality ◽  
Power Grids ◽  
Electrical Network ◽  
The South ◽  
Electric Networks ◽  
Voltage Loss

Distribution electric networks are an important link in the system of production, transmission and consumption of electric energy. The precise configuration and setting up the relay protection and emergency automation devices, including the right choice of the device working parameters, are of great importance for the reliable operation of power grids. Problems with power supply may appear either as poor quality of electricity supply (instability or distortion of voltage, its frequency fluctuation, low capacity of the power grid), or as its unreliability voltage loss. Recently, in the Astrakhan region there has been recorded an increase of electrical loads due to the growing number of enterprises and energy supply building in industry and household. The search for variants with reduced capital investments in the process of the large-scale and expensive energy construction, as well as the selection of simple and relevant proposals for the development and elaborating power supply systems are important issues for designing power lines. The analysis of the electrical network reliability factors of “Astrakhanenergo”, the branch of “IDGC of the South”, PJSC has been done.

Unit Commitment in Electric Energy Systems

2017 ◽  
Author(s):  
Miguel F. Anjos ◽  
Antionio J. Conejo
Keyword(s):  
Unit Commitment ◽  
Electric Energy ◽  
Energy Systems

ADAPTIVE ALGORITHMS OF CONTROLLING THE SMART LI-ION BATTERY CONTROLLER

2018 ◽  
pp. 104-110
Author(s):  
I. A. Borovoy ◽  
O. V. Danishevskiy ◽  
A. V. Parfenov
Keyword(s):  
Power Supply ◽  
Power Supply System ◽  
Electric Energy ◽  
Lithium Ion ◽  
Control Device ◽  
Control Algorithms ◽  
Battery System ◽  
Electronic Control Device ◽  
Li Ion ◽  
Cell Balancing

The article substantiates the necessity of organizing the control system of modern lithium-ion batteries. Passive and active methods of cell balancing are described. The method of increase of efficiency of modes of accumulation of electric energy by means of the special electronic control device (the intellectual controller) and its further use for power supply of the functional equipment is considered. The structure of the intelligent controller as a part of the autonomous power supply system with the description of its main functional units and purpose is presented. Practical results of application in the intellectual controller of original adaptive control algorithms defining modes of operation of lithium-ion drives depending on various environmental conditions are resulted. The results of the analysis obtained by the results of experimental operation of the battery system, reflecting the qualitative and quantitative advantages of the proposed method.

Study of power transformer loading in rural power supply systems

2021 ◽  
Vol 13 (4) ◽  
pp. 282-289
Author(s):  
I. V. Naumov ◽  
D. N. Karamov ◽  
A. N. Tretyakov ◽  
M. A. Yakupova ◽  
E. S. Fedorinovа
Keyword(s):  
Energy Efficiency ◽  
Power Supply ◽  
Rural Areas ◽  
Power Transformer ◽  
Electric Energy ◽  
Power Transformers ◽  
Electric Networks ◽  
Load Factors ◽  
Optimal Load ◽  
Supply Systems

The purpose of this study is to study the effect of loading power transformers (PT) in their continuous use on their energy efficiency on a real-life example of existing rural electric networks. It is noted that the vast majority of PT in rural areas have a very low load factor, which leads to an increase in specific losses of electric energy when this is transmitted to various consumers. It is planned to optimize the existing synchronized power supply systems in rural areas by creating new power supply projects in such a way as to integrate existing power sources and ensure the most efficient loading of power transformers for the subsequent transfer of these systems to isolated ones that receive power from distributed generation facilities. As an example, we use data from an electric grid company on loading power transformers in one of the districts of the Irkutsk region. Issues related to the determination of electric energy losses in rural PT at different numerical values of their load factors are considered. A computing device was developed using modern programming tools in the MATLAB system, which has been used to calculate and plot the dependence of power losses in transformers of various capacities on the actual and recommended load factors, as well as the dependence of specific losses during the transit of 1 kVA of power through a power transformer at the actual, recommended and optimal load factors. The analysis of specific losses of electric energy at the actual, recommended and optimal load factors of PT is made. Based on the analysis, the intervals of optimal load factors for different rated power of PT of rural distribution electric networks are proposed. It is noted that to increase the energy efficiency of PT, it is necessary to reduce idling losses by increasing the load of these transformers, which can be achieved by reducing the number of transformers while changing the configuration of 0.38 kV distribution networks.

Frequency and inertia response effects, capabilities, and possibilities in renewable energy sources

2021 ◽  
Vol 14 ◽  
Author(s):  
Jishu Mary Gomez ◽  
Prabhakar Karthikeyan Shanmugam
Keyword(s):  
Renewable Energy ◽  
Power System ◽  
Frequency Control ◽  
Renewable Energy Sources ◽  
Energy Systems ◽  
Load Shedding ◽  
System Stability ◽  
Frequency Regulation ◽  
Control Schemes ◽  
Inertia Response

Background & Objectives: The global power system is in a state of continuous evolution, incorporating more and more renewable energy systems. The converter-based systems are void of inherent inertia control behavior and are unable to curb minor frequency deviations. The traditional power system, on the other hand, is made up majorly of synchronous generators that have their inertia and governor response for frequency control. For improved inertial and primary frequency response, the existing frequency control methods need to be modified and an additional power reserve is to be maintained mandatorily for this purpose. Energy self-sufficient renewable distributed generator systems can be made possible through optimum active power control techniques. Also, when major global blackouts were analyzed for causes, solutions, and precautions, load shedding techniques were found to be a useful tool to prevent frequency collapse due to power imbalances. The pre-existing load shedding techniques were designed for traditional power systems and were tuned to eliminate low inertia generators as the first step to system stability restoration. To incorporate emerging energy possibilities, the changes in the mixed power system must be addressed and new frequency control capabilities of these systems must be researched. Discussion: In this paper, the power reserve control schemes that enable frequency regulation in the widely incorporated solar photovoltaic and wind turbine generating systems are discussed. Techniques for Under Frequency Load Shedding (UFLS) that can be effectively implemented in renewable energy enabled micro-grid environment for frequency regulation are also briefly discussed. The paper intends to study frequency control schemes and technologies that promote the development of self- sustaining micro-grids. Conclusion: The area of renewable energy research is fast emerging with immense scope for future developments. The comprehensive literature study confirms the possibilities of frequency and inertia response enhancement through optimum energy conservation and control of distributed energy systems.

Design and Characterization of a New MV PLC Coupler for Smart Electric Energy Systems

2018 ◽  
Author(s):  
Giovanni Artale ◽  
Antonio Cataliotti ◽  
Valentina Cosentino ◽  
Salvatore Guaiana ◽  
Dario Di Cara ◽  
...  
Keyword(s):  
Electric Energy ◽  
Energy Systems
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