Pub Date : 2024-08-29DOI: 10.3103/s1068371224700536
O. N. Molokanov
Abstract
Low-speed electrical machines with high specific torque are in demand in many areas of technology where weight and size parameters are important. Traditionally, permanent-magnet machines are used in them, which, however, are characterized by high cost and a small range of speed control. In this regard, research to increase the specific torque of electrical machines with the reactive nature of the electromagnetic torque is urgent. One way to achieve high specific characteristics of such machines is to use a special topology of the magnetic system closely integrated with mechanical-transmission rolling-rotor electrical machines. To operate effectively, such machines must develop a large radial force of attraction, which is why they use special types of windings. There are several known versions of winding designs, but there are no data comparing them with each other. For purposes of a correct comparison, the article performs multidimensional parametric optimization of four variants of magnetic systems with different winding designs according to the torque maximization criterion. As a result, the specific moment is calculated for each magnetic-system version. The obtained results make it possible to draw conclusions about the effectiveness of each winding circuit. These results can be used in the design of rolling-rotor electrical machines.
{"title":"A Comparative Analysis of Rolling-Rotor Electrical Machines of Different Winding Designs","authors":"O. N. Molokanov","doi":"10.3103/s1068371224700536","DOIUrl":"https://doi.org/10.3103/s1068371224700536","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Low-speed electrical machines with high specific torque are in demand in many areas of technology where weight and size parameters are important. Traditionally, permanent-magnet machines are used in them, which, however, are characterized by high cost and a small range of speed control. In this regard, research to increase the specific torque of electrical machines with the reactive nature of the electromagnetic torque is urgent. One way to achieve high specific characteristics of such machines is to use a special topology of the magnetic system closely integrated with mechanical-transmission rolling-rotor electrical machines. To operate effectively, such machines must develop a large radial force of attraction, which is why they use special types of windings. There are several known versions of winding designs, but there are no data comparing them with each other. For purposes of a correct comparison, the article performs multidimensional parametric optimization of four variants of magnetic systems with different winding designs according to the torque maximization criterion. As a result, the specific moment is calculated for each magnetic-system version. The obtained results make it possible to draw conclusions about the effectiveness of each winding circuit. These results can be used in the design of rolling-rotor electrical machines.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199800","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700548
A. A. Afanasyev
Abstract
Equations of mathematical physics, which are solutions of the Laplace’s partial differential equation using the method of separation of variables for hollow cylinders of finite length, are considered as the basis of an analytical model for electric machines. The yoke and tooth layer of the stator core are represented in the model by two nested cylinders, and the end zone of the core is represented by several cylinders connected to each other and to the inner nested cylinder. The unknown constants of the separation of variables method are determined from the boundary conditions of the electromagnetic field: scalar magnetic potentials and coordinate components of the magnetic induction do not experience a jump (discontinuity). The magnetic field caused by the magnetomotive force (MMF) of the stator winding is analyzed in the core itself and outside of it: in the end-winding zone. It is shown that the well-known formula for the MMF of the winding in the active part of the air gap can be used to determine the MMF of the end conductors. The flux linkage of the end parts of the coil is calculated, and the inductance of the end-winding leakage of the entire winding is determined based on this. The validity of the initial analytical approaches for solving the mentioned problem is dictated by the use of three-dimensional equations of mathematical physics in a cylindrical coordinate system for electric machines, the majority of which have a cylindrical construction in the active zone. The obtained numerical value of this parameter for a 150-kW valve motor is sufficiently close to the calculated value found using a known semi-empirical formula applied in the practice of electric machine design.
{"title":"Analytical Estimation of End-Winding Leakage Inductance of Stator Winding of Electric Machines","authors":"A. A. Afanasyev","doi":"10.3103/s1068371224700548","DOIUrl":"https://doi.org/10.3103/s1068371224700548","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Equations of mathematical physics, which are solutions of the Laplace’s partial differential equation using the method of separation of variables for hollow cylinders of finite length, are considered as the basis of an analytical model for electric machines. The yoke and tooth layer of the stator core are represented in the model by two nested cylinders, and the end zone of the core is represented by several cylinders connected to each other and to the inner nested cylinder. The unknown constants of the separation of variables method are determined from the boundary conditions of the electromagnetic field: scalar magnetic potentials and coordinate components of the magnetic induction do not experience a jump (discontinuity). The magnetic field caused by the magnetomotive force (MMF) of the stator winding is analyzed in the core itself and outside of it: in the end-winding zone. It is shown that the well-known formula for the MMF of the winding in the active part of the air gap can be used to determine the MMF of the end conductors. The flux linkage of the end parts of the coil is calculated, and the inductance of the end-winding leakage of the entire winding is determined based on this. The validity of the initial analytical approaches for solving the mentioned problem is dictated by the use of three-dimensional equations of mathematical physics in a cylindrical coordinate system for electric machines, the majority of which have a cylindrical construction in the active zone. The obtained numerical value of this parameter for a 150-kW valve motor is sufficiently close to the calculated value found using a known semi-empirical formula applied in the practice of electric machine design.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"46 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199808","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s106837122470055x
M. V. Ryabchitsky, K. V. Kryukov, K. K. Vorontsov, D. R. Yerkanaliev, D. V. Gridunov
Abstract
The article discusses approaches to creating a monitoring system for electrical installations of buildings, which allows developing measures to reduce losses in the distribution of electricity inside the building. For high-quality operation of the system, it is important to ensure an accuracy of measurements sufficient to eliminate errors in decisions made on the basis of data analysis. Analysis of the used equipment from the point of view of accuracy of measurements of parameters is carried out. Mathematical models have been developed to assess the impact of the accuracy of measuring instruments on the quality of the data obtained.
{"title":"On the Applicability of Information Sources for the Monitoring System of Electrical Parameters of Electrical Installations of Buildings","authors":"M. V. Ryabchitsky, K. V. Kryukov, K. K. Vorontsov, D. R. Yerkanaliev, D. V. Gridunov","doi":"10.3103/s106837122470055x","DOIUrl":"https://doi.org/10.3103/s106837122470055x","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The article discusses approaches to creating a monitoring system for electrical installations of buildings, which allows developing measures to reduce losses in the distribution of electricity inside the building. For high-quality operation of the system, it is important to ensure an accuracy of measurements sufficient to eliminate errors in decisions made on the basis of data analysis. Analysis of the used equipment from the point of view of accuracy of measurements of parameters is carried out. Mathematical models have been developed to assess the impact of the accuracy of measuring instruments on the quality of the data obtained.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"7 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199801","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700470
A. M. Elkholi, D. I. Panfilov, M. G. Astashev, A. V. Chasov, I. D. Panfilov, V. N. Ostrirov
Abstract
Modern distribution networks are characterized by an increase in electrical loads, varying both in phases and over time. Dynamic changes in the operating modes of the load phases have a negative impact on the efficiency and throughput of distribution networks. The use of currently available approaches and technologies for managing network operation modes makes it possible to effectively combat these negative phenomena. The practical implementation of such approaches is based on the use of various devices that automatically affect the operating modes of the distribution network, taking into account the operating modes of the load phases. Choosing the most effective solution depends on many factors. These include the physical parameters of the distribution network and the nature of the loads, the goals and objectives of managing the modes of operation of the network, and the functionality and technical and economic indicators of control devices. At the initial stages of technology assessment, it is important to have an approach that allows one to identify their differences when solving tasks. As such an approach, it is proposed to calculate the operating modes of distribution networks using mathematical models of devices in the MATLAB Simulink environment. The results of calculations of the operating modes of three- and four-wire distribution networks at the specified parameters of the network phases and load are presented. The analysis of the influence of various control technologies on the operating modes of the distribution network is carried out on the example under consideration. Among such technologies, the following are considered: zero sequence current compensation, reactive power compensation, phase power symmetry, symmetry with simultaneous compensation of reactive power in the phases of the distribution network. Brief information about the devices implementing the technologies in question is provided.
{"title":"Analysis of the Influence of Symmetrical Devices on the Operating Modes of Distribution Networks","authors":"A. M. Elkholi, D. I. Panfilov, M. G. Astashev, A. V. Chasov, I. D. Panfilov, V. N. Ostrirov","doi":"10.3103/s1068371224700470","DOIUrl":"https://doi.org/10.3103/s1068371224700470","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>Modern distribution networks are characterized by an increase in electrical loads, varying both in phases and over time. Dynamic changes in the operating modes of the load phases have a negative impact on the efficiency and throughput of distribution networks. The use of currently available approaches and technologies for managing network operation modes makes it possible to effectively combat these negative phenomena. The practical implementation of such approaches is based on the use of various devices that automatically affect the operating modes of the distribution network, taking into account the operating modes of the load phases. Choosing the most effective solution depends on many factors. These include the physical parameters of the distribution network and the nature of the loads, the goals and objectives of managing the modes of operation of the network, and the functionality and technical and economic indicators of control devices. At the initial stages of technology assessment, it is important to have an approach that allows one to identify their differences when solving tasks. As such an approach, it is proposed to calculate the operating modes of distribution networks using mathematical models of devices in the MATLAB Simulink environment. The results of calculations of the operating modes of three- and four-wire distribution networks at the specified parameters of the network phases and load are presented. The analysis of the influence of various control technologies on the operating modes of the distribution network is carried out on the example under consideration. Among such technologies, the following are considered: zero sequence current compensation, reactive power compensation, phase power symmetry, symmetry with simultaneous compensation of reactive power in the phases of the distribution network. Brief information about the devices implementing the technologies in question is provided.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"26 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199795","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700585
V. E. Vysotsky
Abstract
In this article, the physical features of electromagnetic and electromechanical processes in regulated dc valve motors with pulse-width modulation of voltage on armature are considered. The features of the influence of position-dependent switching and control on the functioning of such valve electromechanical systems are analyzed. In rowing electric drives of mobile objects, the use of an adjustable motor of this type has an advantage compared with an asynchronous clock-controlled motor with a short-circuited rotor, which provides the necessary number of consecutive smooth starts.
{"title":"Self-Oscillatory Processes in Pulse-Width Regulation of Phase Voltages of a Direct Current Valve Motor","authors":"V. E. Vysotsky","doi":"10.3103/s1068371224700585","DOIUrl":"https://doi.org/10.3103/s1068371224700585","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>In this article, the physical features of electromagnetic and electromechanical processes in regulated dc valve motors with pulse-width modulation of voltage on armature are considered. The features of the influence of position-dependent switching and control on the functioning of such valve electromechanical systems are analyzed. In rowing electric drives of mobile objects, the use of an adjustable motor of this type has an advantage compared with an asynchronous clock-controlled motor with a short-circuited rotor, which provides the necessary number of consecutive smooth starts.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"29 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199803","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700573
Yu. V. Matveev
Abstract
The monitoring of electrical insulation resistance is one of the most important parameters characterizing the reliability of the on-board electric-power system and the safety of its operation. A significant part of the faults and failures inherent in elements of the shipboard power system is associated with reducing insulation electric resistance with respect to the ship hull caused by exposure to high humidity and temperature, as well as mechanical damage to the insulating layer, electrical cables, wires, and electrical devices. The rules of technical operation establish the lowest values of insulation resistance of the elements of the onboard electric-power system with respect to the ship hull. At the same time, the presence of highly branched electrical networks on the ship complicates the problem of centralized and localized insulation resistance monitoring. In addition, the increase in the number of power plants and possible changes in the number of concurrent consumers within the power system, as well as an increase in the contribution of high-voltage electrical onboard equipment, requires a more reliable control system for electrical insulation resistance. The author concludes that, to provide more reliable insulation resistance monitoring of the elements of an onboard power system, it seems relevant to additionally use novel principles and methods for controlling the measurement information in the monitoring system and processing this information, which differ from those traditionally used in the construction of such systems. For this purpose, as well as to improve the characteristics of the insulation resistance monitoring of the electric-power system, it has been proposed to apply the queuing theory with the assessment of its parameters. The onboard presence of a system for the continuous automatic monitoring of insulation resistance is an important component that provides the reliability and safety of ship operation by its crew.
{"title":"Monitoring Insulation Resistance in Shipboard Electrical Systems Based on Queuing Theory","authors":"Yu. V. Matveev","doi":"10.3103/s1068371224700573","DOIUrl":"https://doi.org/10.3103/s1068371224700573","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The monitoring of electrical insulation resistance is one of the most important parameters characterizing the reliability of the on-board electric-power system and the safety of its operation. A significant part of the faults and failures inherent in elements of the shipboard power system is associated with reducing insulation electric resistance with respect to the ship hull caused by exposure to high humidity and temperature, as well as mechanical damage to the insulating layer, electrical cables, wires, and electrical devices. The rules of technical operation establish the lowest values of insulation resistance of the elements of the onboard electric-power system with respect to the ship hull. At the same time, the presence of highly branched electrical networks on the ship complicates the problem of centralized and localized insulation resistance monitoring. In addition, the increase in the number of power plants and possible changes in the number of concurrent consumers within the power system, as well as an increase in the contribution of high-voltage electrical onboard equipment, requires a more reliable control system for electrical insulation resistance. The author concludes that, to provide more reliable insulation resistance monitoring of the elements of an onboard power system, it seems relevant to additionally use novel principles and methods for controlling the measurement information in the monitoring system and processing this information, which differ from those traditionally used in the construction of such systems. For this purpose, as well as to improve the characteristics of the insulation resistance monitoring of the electric-power system, it has been proposed to apply the queuing theory with the assessment of its parameters. The onboard presence of a system for the continuous automatic monitoring of insulation resistance is an important component that provides the reliability and safety of ship operation by its crew.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"39 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199805","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700512
R. N. Krasnoperov, M. G. Astashev, A. V. Altergot, A. V. Badalyan, M. S. Pavlova, D. M. Ustimov
Abstract
A semiconductor reactive power controller with high-quality reactive current regulation and high technical and economic indicators is considered. The advantages of using switches based on thyristor switches as parts of reactive power compensators are shown. A semiconductor reactive power controller technology based on real-time control of an equivalent reactive element is presented. The use of a “binary” thyristor-switched capacitor group is considered as one of the most optimal power circuit implementations. Algorithms for active-adaptive control and high quality of network current and voltage, including reactive current control switching, are proposed. The block diagram of the device control system is considered, which ensures automatic maintenance of optimal network operating modes by updating the parameters of network digital mathematical twins and selecting the best operating mode of a semiconductor reactive power controller. The functional capabilities of the device are shown, allowing it to be integrated into modern active-adaptive electrical networks and digital substations. The operation results of pilot industrial samples are presented, confirming the effectiveness of the proposed technical solutions. The possibilities of scaling the technology in wide ranges of voltage and power classes are noted. The prospects for the development and application of devices are shown.
{"title":"Adaptive Semiconductor Reactive Power Controllers with High-Quality Reactive Current for 0.4-kV Networks","authors":"R. N. Krasnoperov, M. G. Astashev, A. V. Altergot, A. V. Badalyan, M. S. Pavlova, D. M. Ustimov","doi":"10.3103/s1068371224700512","DOIUrl":"https://doi.org/10.3103/s1068371224700512","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>A semiconductor reactive power controller with high-quality reactive current regulation and high technical and economic indicators is considered. The advantages of using switches based on thyristor switches as parts of reactive power compensators are shown. A semiconductor reactive power controller technology based on real-time control of an equivalent reactive element is presented. The use of a “binary” thyristor-switched capacitor group is considered as one of the most optimal power circuit implementations. Algorithms for active-adaptive control and high quality of network current and voltage, including reactive current control switching, are proposed. The block diagram of the device control system is considered, which ensures automatic maintenance of optimal network operating modes by updating the parameters of network digital mathematical twins and selecting the best operating mode of a semiconductor reactive power controller. The functional capabilities of the device are shown, allowing it to be integrated into modern active-adaptive electrical networks and digital substations. The operation results of pilot industrial samples are presented, confirming the effectiveness of the proposed technical solutions. The possibilities of scaling the technology in wide ranges of voltage and power classes are noted. The prospects for the development and application of devices are shown.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"165 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199806","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700500
D. A. Seregin, M. G. Astashev, I. P. Voronin, P. A. Rashitov, M. S. Pavlova, D. V. Mostovoy
Abstract
А high-voltage multicellular power supply with energy transfer through a current loop and current transformers is considered. The power source (static-electricity converter) consists of an inverter that generates a current with a preset magnitude in a current loop, which consists of a cable segment, and current transformers, the primary winding of which is represented by a current loop, as well as controlled rectifier cells. Such a decision makes it possible to provide a reliable isolation level between the input and output circuits of the source with a rather simple design of the device. Owing to the use of the same type of rectifier cells in the structure, one can provide a simple scaling of the source according to the output voltage level, as well as a simple setup and repair of the device. The principle of operation has been considered, and the choice of engineering solutions for the main components of the device has been justified. A system for stabilizing rectifier cell output voltage has been investigated as an automatic control system with pulse-phase control. The frequency characteristics of this system for two modes of energy transfer to the load are obtained, the modes are compared, and the most promising one is determined. A mockup of a 10-kV power supply has been manufactured and tested. The results of testing have confirmed the correctness of the calculations and the efficiency of the proposed approach.
{"title":"Power Supply with Energy Transfer by Current Transformers","authors":"D. A. Seregin, M. G. Astashev, I. P. Voronin, P. A. Rashitov, M. S. Pavlova, D. V. Mostovoy","doi":"10.3103/s1068371224700500","DOIUrl":"https://doi.org/10.3103/s1068371224700500","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>А high-voltage multicellular power supply with energy transfer through a current loop and current transformers is considered. The power source (static-electricity converter) consists of an inverter that generates a current with a preset magnitude in a current loop, which consists of a cable segment, and current transformers, the primary winding of which is represented by a current loop, as well as controlled rectifier cells. Such a decision makes it possible to provide a reliable isolation level between the input and output circuits of the source with a rather simple design of the device. Owing to the use of the same type of rectifier cells in the structure, one can provide a simple scaling of the source according to the output voltage level, as well as a simple setup and repair of the device. The principle of operation has been considered, and the choice of engineering solutions for the main components of the device has been justified. A system for stabilizing rectifier cell output voltage has been investigated as an automatic control system with pulse-phase control. The frequency characteristics of this system for two modes of energy transfer to the load are obtained, the modes are compared, and the most promising one is determined. A mockup of a 10-kV power supply has been manufactured and tested. The results of testing have confirmed the correctness of the calculations and the efficiency of the proposed approach.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199797","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700494
P. A. Rashitov, M. G. Astashev, D. I. Panfilov, D. V. Mostovoy, A. V. Chasov, V. V. Bespaly
Abstract
An approach is presented to the construction of control systems for semiconductor power regulators for distribution networks with the aim of balancing network operating modes and reactive-power compensation. The main functions to be realized by control systems of semiconductor power regulators are formulated. A generalized structure of the control system is presented, applicable for a wide class of circuit solutions for semiconductor power regulators. A generalized algorithm for the control system operation is proposed. An example of implementation of a hardware–software complex of a control system for one of the semiconductor power-regulator circuits is presented. Results of experimental studies of the control system operation in automatic mode of a prototype of one of the semiconductor power-regulator schemes showing the balancing of active power in the network under a dynamically changing load are given.
{"title":"Control Systems for Semiconductor Power Regulators in Distribution Networks","authors":"P. A. Rashitov, M. G. Astashev, D. I. Panfilov, D. V. Mostovoy, A. V. Chasov, V. V. Bespaly","doi":"10.3103/s1068371224700494","DOIUrl":"https://doi.org/10.3103/s1068371224700494","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>An approach is presented to the construction of control systems for semiconductor power regulators for distribution networks with the aim of balancing network operating modes and reactive-power compensation. The main functions to be realized by control systems of semiconductor power regulators are formulated. A generalized structure of the control system is presented, applicable for a wide class of circuit solutions for semiconductor power regulators. A generalized algorithm for the control system operation is proposed. An example of implementation of a hardware–software complex of a control system for one of the semiconductor power-regulator circuits is presented. Results of experimental studies of the control system operation in automatic mode of a prototype of one of the semiconductor power-regulator schemes showing the balancing of active power in the network under a dynamically changing load are given.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"151 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199799","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-08-29DOI: 10.3103/s1068371224700524
A. N. Shishkov, M. M. Dudkin, V. K. Le, N. A. Eremin
Abstract
The voltage imbalance of the neutral point (NP) of the dc link is an inherent limitation in using three-level autonomous voltage inverters with a fixed neutral point in electric-drive systems. To ensure the NP voltage balance within acceptable limits, a control algorithm based on space-vector PWM with a seven-stage switching sequence (SS) is proposed. Compared with the known control methods, the new alternative significantly improves the NP voltage balance by adjusting the fill factor of distributed base vectors in each PWM period based on phase load currents. The algorithm also eliminates the NP voltage imbalance caused by external factors, for example, by the asymmetry of dc capacitors or three-phase load and other factors due to the feedback signal on voltage deviations in two dc link capacitors. A system for calculating the turn-on lengths of basic vectors in a seven-stage SS is presented. The efficiency of the proposed algorithm is confirmed by computer simulation in the MATLAB Simulink suite. The proposed algorithm reduces the average maximal relative error in the NP voltage by 86% over the entire variation range of the modulation coefficient compared to the known method of balancing the NP voltage based on a feedback signal on voltage deviations in two dc link capacitors. This allows efficiently balancing the NP voltage and, as a result, improves the operational reliability of the inverter.
{"title":"Neutral Point Voltage Balance in Three-Level Voltage Inverter Based on Space-Vector PWM with Seven-Stage Switching Sequence","authors":"A. N. Shishkov, M. M. Dudkin, V. K. Le, N. A. Eremin","doi":"10.3103/s1068371224700524","DOIUrl":"https://doi.org/10.3103/s1068371224700524","url":null,"abstract":"<h3 data-test=\"abstract-sub-heading\">Abstract</h3><p>The voltage imbalance of the neutral point (NP) of the dc link is an inherent limitation in using three-level autonomous voltage inverters with a fixed neutral point in electric-drive systems. To ensure the NP voltage balance within acceptable limits, a control algorithm based on space-vector PWM with a seven-stage switching sequence (SS) is proposed. Compared with the known control methods, the new alternative significantly improves the NP voltage balance by adjusting the fill factor of distributed base vectors in each PWM period based on phase load currents. The algorithm also eliminates the NP voltage imbalance caused by external factors, for example, by the asymmetry of dc capacitors or three-phase load and other factors due to the feedback signal on voltage deviations in two dc link capacitors. A system for calculating the turn-on lengths of basic vectors in a seven-stage SS is presented. The efficiency of the proposed algorithm is confirmed by computer simulation in the MATLAB Simulink suite. The proposed algorithm reduces the average maximal relative error in the NP voltage by 86% over the entire variation range of the modulation coefficient compared to the known method of balancing the NP voltage based on a feedback signal on voltage deviations in two dc link capacitors. This allows efficiently balancing the NP voltage and, as a result, improves the operational reliability of the inverter.</p>","PeriodicalId":39312,"journal":{"name":"Russian Electrical Engineering","volume":"47 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-08-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142199798","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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