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Prof. Dr. Stanimir Valtchev
Faculty of Science and Technology Electrical Engineering Department, Universidade Nova de Lisboa, Lisbon, Portugal; Invited Professor in BFU-Burgas and TU-Sofia, Bulgaria

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Research Keywords & Expertise

0 Based on a versatile experience
0 The research interests include HF and resonant power converters
0 Wireless energy transfer to electric vehicles
0 Energy management and storage in DC grids
0 Efficient micro-power devices

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Based on a versatile experience
Energy harvesting and auto-supplied sensors
Wireless energy transfer to electric vehicles

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Review
Published: 23 June 2021 in Electronics
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The hybrid three-phase rectifiers (HTR) consist of parallel associations of two rectifiers (rectifier 1 and rectifier 2), each one of them with a distinct operation, while the sum of their input currents forms a sinusoidal or multilevel waveform. In general, rectifier 1 is a GRAETZ (full bridge) (can be combined with a BOOST converter) and rectifier 2 is combined with a DC-DC converter. In this HTR contest, this paper is intended to answer some important questions about those hybrid rectifiers. To obtain the correct answers, the study is conducted as an analysis of a systematic literature review. Thus, a search was carried out in the databases, mostly IEEE and IET, and 34 papers were selected as the best corresponding to the HTR theme. It is observed that the preferred form of power distribution in unidirectional hybrid three-phase rectifiers (UHTR) is 55%Po (rectifier 1) and 45%Po (rectifier 2). For the bidirectional hybrid three-phase rectifiers (BHTR), rectifier 1 preferably takes 90% of Po and 10% of Po is processed by rectifier 2. It is also observed that the UHTR that employ the single-ended primary-inductor converter (SEPIC) or VIENNA converter topologies in rectifier 2 can present sinusoidal input currents with low total harmonic distortion (THD) and high Power Factor (PF), even successfully complying with the international standards. The same can be said about the rectifier that employs a pulse-width (PWM) converter of BOOST topology in rectifier 2. In short, the HTR are interesting because they allow using the GRAETZ full bridge topology in rectifier 1, thus taking advantage of its characteristics, being simple, robust, and reliable. At the same time, the advantages of rectifier 2, i.e., high PF and low THD, are well used. In addition, this article also points out the future direction of research that is still unexplored in the literature, thus giving opportunities for future innovation.

ACS Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics 2021, 10, 1520 .

AMA Style

José Gonçalves, Stanimir Valtchev, Rui Melicio, Alcides Gonçalves, Frede Blaabjerg. Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review. Electronics. 2021; 10 (13):1520.

Chicago/Turabian Style

José Gonçalves; Stanimir Valtchev; Rui Melicio; Alcides Gonçalves; Frede Blaabjerg. 2021. "Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review." Electronics 10, no. 13: 1520.

Journal article
Published: 09 June 2021 in IEEE Transactions on Power Electronics
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Superconductivity is a remarkable state of matter exhibited by some materials, which is characterized by the vanishing of electrical resistivity at cryogenic temperatures, among other phenomena. However, the prospective economical viability of superconducting devices relies heavily on an efficient cooling system to remove the heat generated during operation. Although this would be meaningless in conventional devices, it occurs at cryogenic temperatures, impacting the efficiency and cost of the whole system. Thus, it is necessary to predict the losses of, e.g., superconducting coils in power systems. This work presents a study of AC losses in superconducting coils due to non-characteristic current harmonics. These harmonic components are typical in electromechanical drives like the one presented in the work. A computational model of high-temperature superconducting (HTS) coils and the numerical procedure used to solve the problem are described in the paper. The contribution of the non-characteristic harmonic components in these AC losses will be presented. These results, obtained by computational analysis, were validated in experimental tests that assessed the power dissipated due to triangular waveforms currents.

ACS Style

Roberto Andr Henrique de Oliveira; Joao Murta-Pina; Maria Beln Rivera Vega; Alfredo Alvarez; Stanimir Valtchev; Anabela Pronto; Pilar Suarez. Effects of Noncharacteristic Harmonics on AC Losses of High-Temperature Superconducting Coils. IEEE Transactions on Power Electronics 2021, 36, 13697 -13705.

AMA Style

Roberto Andr Henrique de Oliveira, Joao Murta-Pina, Maria Beln Rivera Vega, Alfredo Alvarez, Stanimir Valtchev, Anabela Pronto, Pilar Suarez. Effects of Noncharacteristic Harmonics on AC Losses of High-Temperature Superconducting Coils. IEEE Transactions on Power Electronics. 2021; 36 (12):13697-13705.

Chicago/Turabian Style

Roberto Andr Henrique de Oliveira; Joao Murta-Pina; Maria Beln Rivera Vega; Alfredo Alvarez; Stanimir Valtchev; Anabela Pronto; Pilar Suarez. 2021. "Effects of Noncharacteristic Harmonics on AC Losses of High-Temperature Superconducting Coils." IEEE Transactions on Power Electronics 36, no. 12: 13697-13705.

Journal article
Published: 17 March 2021 in Electronics
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It is inevitable that high-intensity, wide-spectrum electromagnetic emissions are generated by the power electronic equipment of the Extra High Voltage (EHV) power converter station. The surveillance flight of Unmanned Aerial Vehicles (UAVs) is thus, situated in a complex electromagnetic environment. The ubiquitous electromagnetic interference demands higher electromagnetic protection requirements from the UAV construction and operation. This article is related to the UAVs patrol inspections of the power line in the vicinity of the EHV converter station. The article analyzes the electromagnetic interference characteristics of the converter station equipment in the surrounding space and the impact of the electromagnetic emission on the communication circuits of the UAV. The anti-electromagnetic interference countermeasures strive to eliminate or reduce the threats of electromagnetic emissions on the UAV’s hardware and its communication network.

ACS Style

Yanchu Li; Qingqing Ding; Keyue Li; Stanimir Valtchev; Shufang Li; Liang Yin. A Survey of Electromagnetic Influence on UAVs from an EHV Power Converter Stations and Possible Countermeasures. Electronics 2021, 10, 701 .

AMA Style

Yanchu Li, Qingqing Ding, Keyue Li, Stanimir Valtchev, Shufang Li, Liang Yin. A Survey of Electromagnetic Influence on UAVs from an EHV Power Converter Stations and Possible Countermeasures. Electronics. 2021; 10 (6):701.

Chicago/Turabian Style

Yanchu Li; Qingqing Ding; Keyue Li; Stanimir Valtchev; Shufang Li; Liang Yin. 2021. "A Survey of Electromagnetic Influence on UAVs from an EHV Power Converter Stations and Possible Countermeasures." Electronics 10, no. 6: 701.

Journal article
Published: 17 March 2021 in IEEE/ASME Transactions on Mechatronics
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The paper reports a theoretical and experimental study of a novel thermal energy harvester with heat-induced vibrations in an environment with a nonzero temperature gradient. The energy harvester comprises a Shape Memory Alloy wire from Nitinol and two elastic cantilever beams with deposited Lead Zirconium Titanate piezoelectric layers. The Shape Memory Alloy wire is pre-strained by the free ends of the cantilever beams connected in a bow-similar structure. The environment temperature gradient is obtained from the difference in temperatures of a heater and colder air in the room. When the wire approaches the heater, it heats up and shortens, causing it to move away from the hot zone and entering into a colder zone. This causes the wire to cool and to approach the heater again. The cyclic change of the length of the Shape Memory Alloy wire causes vibrations in the cantilever beams due to which electricity is produced by the piezoelectric layers. A dynamical model, based on the theory of Lagrange and Maxwell, combining mechanical, piezoelectric and thermal domains, is derived and used to prove the concept of the developed novel device and for theoretical investigation of the energy harvester performance. The hysteretic behaviour of the Shape Memory Alloy is involved in the model. The theoretical results have been proved experimentally.

ACS Style

Todor Stoilov Todorov; Andrey S Fursov; Rosen P Mitrev; Vasily V Fomichev; Stanimir Valtchev; Alexander V Ilin. Energy Harvesting with Thermally Induced Vibrations in Shape Memory Alloys by a Constant Temperature Heater. IEEE/ASME Transactions on Mechatronics 2021, PP, 1 -1.

AMA Style

Todor Stoilov Todorov, Andrey S Fursov, Rosen P Mitrev, Vasily V Fomichev, Stanimir Valtchev, Alexander V Ilin. Energy Harvesting with Thermally Induced Vibrations in Shape Memory Alloys by a Constant Temperature Heater. IEEE/ASME Transactions on Mechatronics. 2021; PP (99):1-1.

Chicago/Turabian Style

Todor Stoilov Todorov; Andrey S Fursov; Rosen P Mitrev; Vasily V Fomichev; Stanimir Valtchev; Alexander V Ilin. 2021. "Energy Harvesting with Thermally Induced Vibrations in Shape Memory Alloys by a Constant Temperature Heater." IEEE/ASME Transactions on Mechatronics PP, no. 99: 1-1.

Journal article
Published: 13 February 2021 in Applied Sciences
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In this paper, a new way to mitigate the current interactions is proposed. The problem of current interactions arises when a modular three-phase (3-phase) rectifier (three single-phase modules) with boost converter for power factor correction (PFC) is used. A new differential-mode choke filter is implemented in the developed boost converter. The choke here is a specially made differential inductor in the input of the boost converter that eliminates the known current interactions. To prove the new concept, a study of the level of mitigation of the current interactions is presented. The control is operated in continuous driving mode (CCM), and the popular UC3854B circuit was used for this. The rectifier proposal is validated through a set of simulations performed on the PSIM 12.0 platform, as well as the construction of a prototype. With the results obtained, it is confirmed that the differential-mode choke filter eliminates the current interactions. It is observed that at the input of the rectifier, a sinusoidal alternating current with a low level of harmonic distortion is consumed from the grid. The sinusoidal shape of the phase current proves that a better power factor capable of meeting the international standards is obtained, and that the circuit in its initial version is operational. This proven result promises a good PFC operation, to guarantee the better quality of the electrical energy, being able to be applied in systems that require a high PFC, e.g., in battery charging, wind systems, or in aeronautics and spacecrafts.

ACS Style

José Teixeira Gonçalves; Stanimir Valtchev; Rui Melicio. Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter. Applied Sciences 2021, 11, 1684 .

AMA Style

José Teixeira Gonçalves, Stanimir Valtchev, Rui Melicio. Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter. Applied Sciences. 2021; 11 (4):1684.

Chicago/Turabian Style

José Teixeira Gonçalves; Stanimir Valtchev; Rui Melicio. 2021. "Current Interactions Mitigation in 3-Phase PFC Modular Rectifier through Differential-Mode Choke Filter Boost Converter." Applied Sciences 11, no. 4: 1684.

Conference paper
Published: 11 November 2020 in 2020 2nd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA)
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This paper discusses the improvement of two-phase motor control systems. In the last 100 years two-phase induction motors have been massively replaced by the three-phase motors, but nevertheless in many industries, they are still good solution. These areas are high-power traction drives with DC motors used in electric vehicles. Or vice versa, low-power household drives fed by single-phase grid or DC battery, where, unregulated single-phase induction motors or small DC motors are used. There are many control algorithms available for two-phase drives. However, at the beginning of each study in this area, the authors in advance gave preference to one of them and did not conduct a comprehensive analysis. This requires a comprehensive analysis that can show which control system is the best for a particular electric drive. This paper provides a similar analisys of several models of two-phase drives.

ACS Style

Stanimir Valtchev; Oleg Viktorovich Kryukov; Viktor Nikolayevich Meshcheryakov; Aleksey Sergeevich Belousov. Comparative Analysis of Electric Drives Control Systems Applied to Two-Phase Induction Motors. 2020 2nd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA) 2020, 918 -922.

AMA Style

Stanimir Valtchev, Oleg Viktorovich Kryukov, Viktor Nikolayevich Meshcheryakov, Aleksey Sergeevich Belousov. Comparative Analysis of Electric Drives Control Systems Applied to Two-Phase Induction Motors. 2020 2nd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA). 2020; ():918-922.

Chicago/Turabian Style

Stanimir Valtchev; Oleg Viktorovich Kryukov; Viktor Nikolayevich Meshcheryakov; Aleksey Sergeevich Belousov. 2020. "Comparative Analysis of Electric Drives Control Systems Applied to Two-Phase Induction Motors." 2020 2nd International Conference on Control Systems, Mathematical Modeling, Automation and Energy Efficiency (SUMMA) , no. : 918-922.

Conference paper
Published: 03 November 2020 in Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering
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In this paper, an analytical formula for the coupling coefficient (k) was introduced for two inductively coupled coils of ring configuration. The response surface methodology (RSM) was used as a tool to develop this formula. The k was tested as a function of the geometrical parameters which include the followings parameters: an air-gap (d) between inductively coupled coils; coils dimensions which include the inner (r1) and outer (r2) radii of the transmitter coil, inner (R1) and outer (R2) radii of the receiver coil; and misalignment parameters. Therefore, the introduced k formula is facilitating of a ring coil design, performance optimization of an IPT system, and prediction of system behaviour at normal or misalignment cases. The percentage effect of each parameter on the k was calculated. It was found that the d has the most considerable impact on the k among other geometrical parameters.

ACS Style

Mohammed Al-Saadi; Stanimir Valtchev; José Gonçalves; Aurelian Crăciunescu. New Analytical Formulas for Coupling Coefficient of Two Inductively Coupled Ring Coils in Inductive Wireless Power Transfer System. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering 2020, 117 -127.

AMA Style

Mohammed Al-Saadi, Stanimir Valtchev, José Gonçalves, Aurelian Crăciunescu. New Analytical Formulas for Coupling Coefficient of Two Inductively Coupled Ring Coils in Inductive Wireless Power Transfer System. Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering. 2020; ():117-127.

Chicago/Turabian Style

Mohammed Al-Saadi; Stanimir Valtchev; José Gonçalves; Aurelian Crăciunescu. 2020. "New Analytical Formulas for Coupling Coefficient of Two Inductively Coupled Ring Coils in Inductive Wireless Power Transfer System." Lecture Notes of the Institute for Computer Sciences, Social Informatics and Telecommunications Engineering , no. : 117-127.

Conference paper
Published: 20 October 2020 in 2020 2nd Global Power, Energy and Communication Conference (GPECOM)
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This study introduces an efficient method to determine the computation mathematical formula of mutual inductance (M) for a pair of ring coils. A design technique called Box-Behnken that based on the response surface methodology (RSM) was utilised to develop such a formula. The M was developed to be a function for the air-gap (d) between the coupled coils, coils dimensions, and misalignment parameters. Therefore, the introduced new formula is facilitating a ring coil design, and prediction of system behaviour in normal or misalignment conditions. The percentage impact of each parameter on the M was measured. It was found that M is mainly affected by d. Finally, the outcomes due to the new formula are in a line with the results obtained from the finite element modelling (FEM) simulation.

ACS Style

Sarab Al-Chlaihawi; Stanimir Valtchev; Ersan Kabalci. A New Mathematical Expression for Mutual Inductance of Two Coupled Ring Coils. 2020 2nd Global Power, Energy and Communication Conference (GPECOM) 2020, 36 -40.

AMA Style

Sarab Al-Chlaihawi, Stanimir Valtchev, Ersan Kabalci. A New Mathematical Expression for Mutual Inductance of Two Coupled Ring Coils. 2020 2nd Global Power, Energy and Communication Conference (GPECOM). 2020; ():36-40.

Chicago/Turabian Style

Sarab Al-Chlaihawi; Stanimir Valtchev; Ersan Kabalci. 2020. "A New Mathematical Expression for Mutual Inductance of Two Coupled Ring Coils." 2020 2nd Global Power, Energy and Communication Conference (GPECOM) , no. : 36-40.

Conference paper
Published: 04 October 2020 in 2020 XI International Conference on Electrical Power Drive Systems (ICEPDS)
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Real-time systems are confidently used by electric drive developers to test control systems and converters. Such systems are called Hardware-in-the-Loop (HiL) system and Power Hardware-in-the-Loop (PHiL) system. The application options of these systems are presented. Issues connected with HiL and PHiL requiring study and research are discussed.

ACS Style

Mikhail Mudrov; Anatolii Ziuzev; Konstantin Nesterov; Stanimir Valtchev. Status and development prospects of real-time systems (RTS) in the electric drive. 2020 XI International Conference on Electrical Power Drive Systems (ICEPDS) 2020, 1 -5.

AMA Style

Mikhail Mudrov, Anatolii Ziuzev, Konstantin Nesterov, Stanimir Valtchev. Status and development prospects of real-time systems (RTS) in the electric drive. 2020 XI International Conference on Electrical Power Drive Systems (ICEPDS). 2020; ():1-5.

Chicago/Turabian Style

Mikhail Mudrov; Anatolii Ziuzev; Konstantin Nesterov; Stanimir Valtchev. 2020. "Status and development prospects of real-time systems (RTS) in the electric drive." 2020 XI International Conference on Electrical Power Drive Systems (ICEPDS) , no. : 1-5.

Conference paper
Published: 29 April 2020 in Computer and Computing Technologies in Agriculture IV
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Cardiovascular diseases remain the leading cause of morbidity, mortality, early disability and growing health costs worldwide. The difficulty for monitoring the evolution of cardiovascular related diseases can be, partially, attributed to the lack of appropriate indicators for arterial injury and cardiac disfunction during routine clinical practice. Non-invasive sensors, such as Photoplethysmography (PPG) devices, can be used for the measurement of several hemodynamic related parameters, albeit, most of current sensors require a skilled operator to interpret that sensory data. This paper presents a novel, method for an open architecture system where the simultaneous utilization of different types of devices is possible, PPG, Electrocardiogram (ECG) or other. Working, communicating and synchronizing through a wireless network, those can be placed on specific points of the patient’s body and will allow to get better information of the cardiovascular marker of interest: hemodynamic or other, reducing the workload for the operator. The proposed open architecture is a simple cost-effective solution that can potentially achieve a widespread use in daily clinical practice.

ACS Style

Paulo Bonifacio; Valentina Vasssilenko; Andreia Serrano; Filipa Cardoso; Stanimir Valtchev. Multi-sensor Synchronization Model for Sensor Fusion Applied to Innovative Cardiovascular Markers. Computer and Computing Technologies in Agriculture IV 2020, 411 -419.

AMA Style

Paulo Bonifacio, Valentina Vasssilenko, Andreia Serrano, Filipa Cardoso, Stanimir Valtchev. Multi-sensor Synchronization Model for Sensor Fusion Applied to Innovative Cardiovascular Markers. Computer and Computing Technologies in Agriculture IV. 2020; ():411-419.

Chicago/Turabian Style

Paulo Bonifacio; Valentina Vasssilenko; Andreia Serrano; Filipa Cardoso; Stanimir Valtchev. 2020. "Multi-sensor Synchronization Model for Sensor Fusion Applied to Innovative Cardiovascular Markers." Computer and Computing Technologies in Agriculture IV , no. : 411-419.

Journal article
Published: 01 April 2020 in Global Energy Interconnection
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The modelling of the distribution transformer winding is the starting point and serves as important basis for the transformer characteristics analysis and the lightning pulse response prediction. A distributed parameters model can depict the winding characteristics accurately, but it requires complex calculations. Lumped parameter model requires less calculations, but its applicable frequency range is not wide. This paper studies the amplitude-frequency characteristics of the lightning wave, compares the transformer modelling methods and finally proposes a modified lumped parameter model, based on the above comparison. The proposed model minimizes the errors provoked by the lumped parameter approximation, and the hyperbolic functions of the distributed parameter model. By this modification it becomes possible to accurately describe the winding characteristics and rapidly obtain the node voltage response. The proposed model can provide theoretical and experimental support to lightning protection of the distribution transformer.

ACS Style

Qingqing Ding; Yao Yao; Bingqian Wang; Jingwei Fu; Wei Zhang; Chao Zeng; Xiaoping Li; Stanimir Valtchev. A modified lumped parameter model of distribution transformer winding. Global Energy Interconnection 2020, 3, 158 -165.

AMA Style

Qingqing Ding, Yao Yao, Bingqian Wang, Jingwei Fu, Wei Zhang, Chao Zeng, Xiaoping Li, Stanimir Valtchev. A modified lumped parameter model of distribution transformer winding. Global Energy Interconnection. 2020; 3 (2):158-165.

Chicago/Turabian Style

Qingqing Ding; Yao Yao; Bingqian Wang; Jingwei Fu; Wei Zhang; Chao Zeng; Xiaoping Li; Stanimir Valtchev. 2020. "A modified lumped parameter model of distribution transformer winding." Global Energy Interconnection 3, no. 2: 158-165.

Conference paper
Published: 01 November 2019 in 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA)
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ACS Style

Todor Todorov; Stanimir Valtchev; Francesc Moll; Nicolay Nikolov; Rumen Nikolov. Combined Piezoelectric Vibroimpact Energy Harvester with Improved Performance. 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA) 2019, 1 .

AMA Style

Todor Todorov, Stanimir Valtchev, Francesc Moll, Nicolay Nikolov, Rumen Nikolov. Combined Piezoelectric Vibroimpact Energy Harvester with Improved Performance. 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA). 2019; ():1.

Chicago/Turabian Style

Todor Todorov; Stanimir Valtchev; Francesc Moll; Nicolay Nikolov; Rumen Nikolov. 2019. "Combined Piezoelectric Vibroimpact Energy Harvester with Improved Performance." 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA) , no. : 1.

Conference paper
Published: 01 November 2019 in 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA)
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Important requirements for the modern electric drives are the high overload capacity and a wide range of speed control. A two-phase adjustable low-power drive has these properties, but its implementation in small-scale mechanics is hindered by the need a frequency converter that provides a three-phase power grid into a two-phase network, which is important when the power of the mechanisms increases. Previous studies have already shown the possibility of using a typical frequency converter based on a three-phase full-bridge voltage inverter applying space-vector PWM method. The switching frequency of the inverter remains, unfortunately, relatively high. It is not possible to reduce this frequency without degrading the harmonic composition. The goal of this work is to develop an algorithm for controlling the two-phase electric drive system, while reducing the numberof commutations of the switching devices of the three-phase inverter, and at the same time keeping the deviations of the instantaneous values of the phase currents close enough to the reference.

ACS Style

Aleksey Sergeevich Belousov; Viktor Nikolayevich Meshcheryakov; Stanimir Valtchev; Oleg Viktorovich Kryukov. Development of a Control Algorithm for Three-Phase Inverter in Two-Phase Electric Drives Reducing the Number of Commutations. 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA) 2019, 444 -449.

AMA Style

Aleksey Sergeevich Belousov, Viktor Nikolayevich Meshcheryakov, Stanimir Valtchev, Oleg Viktorovich Kryukov. Development of a Control Algorithm for Three-Phase Inverter in Two-Phase Electric Drives Reducing the Number of Commutations. 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA). 2019; ():444-449.

Chicago/Turabian Style

Aleksey Sergeevich Belousov; Viktor Nikolayevich Meshcheryakov; Stanimir Valtchev; Oleg Viktorovich Kryukov. 2019. "Development of a Control Algorithm for Three-Phase Inverter in Two-Phase Electric Drives Reducing the Number of Commutations." 2019 1st International Conference on Control Systems, Mathematical Modelling, Automation and Energy Efficiency (SUMMA) , no. : 444-449.

Conference paper
Published: 25 October 2019 in E3S Web of Conferences
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This paper presents the study of induction motor operation with regulated frequency and voltage while maintaining the absolute slip of the two optimal modes with a minimum of the “stator current / torque” ratio and a minimum of the “winding loss / torque” ratio; the results of experimental studies confirm the validity of the analytical expressions.

ACS Style

V. N. Meshcheryakov; V. V. Danilov; Sh. R. Khasanov; Stanimir Valtchev. Minimization of the stator current in induction motor with defined load on the shaft by maintaining optimum absolute slip. E3S Web of Conferences 2019, 124, 01036 .

AMA Style

V. N. Meshcheryakov, V. V. Danilov, Sh. R. Khasanov, Stanimir Valtchev. Minimization of the stator current in induction motor with defined load on the shaft by maintaining optimum absolute slip. E3S Web of Conferences. 2019; 124 ():01036.

Chicago/Turabian Style

V. N. Meshcheryakov; V. V. Danilov; Sh. R. Khasanov; Stanimir Valtchev. 2019. "Minimization of the stator current in induction motor with defined load on the shaft by maintaining optimum absolute slip." E3S Web of Conferences 124, no. : 01036.

Conference paper
Published: 25 October 2019 in E3S Web of Conferences
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This paper discusses the wound rotor induction motor and variable-frequency drive (VFD) that regulates the stator voltage frequency. The stator and rotor windings are connected to a common electrical circuit. The slip energy of the motor goes to the DC link and feeds the stator winding of the motor. The block diagram of the electric drive, the equivalent circuit and the basic characteristic of the cascade VFD are considered. It is shown that the energy-saving mode with a minimum ratio “stator current/torque” is achieved at an angle between vectors of the stator current and the excitation current at the level of 45 degrees. The experimental static mechanical characteristics of the electric drive were obtained. These characteristics provide a limitation of the starting torque.

ACS Style

V. N. Meshcheryakov; D. V. Lastochkin; Z.M. Shakurova; Stanimir Valtchev. Energy saving system of cascade variable frequency induction electric drive. E3S Web of Conferences 2019, 124, 01037 .

AMA Style

V. N. Meshcheryakov, D. V. Lastochkin, Z.M. Shakurova, Stanimir Valtchev. Energy saving system of cascade variable frequency induction electric drive. E3S Web of Conferences. 2019; 124 ():01037.

Chicago/Turabian Style

V. N. Meshcheryakov; D. V. Lastochkin; Z.M. Shakurova; Stanimir Valtchev. 2019. "Energy saving system of cascade variable frequency induction electric drive." E3S Web of Conferences 124, no. : 01037.

Conference paper
Published: 01 October 2019 in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
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The magnetic resonance coupling method is recognized as the most suitable to achieve highly efficient wireless energy transfer for battery charging. However, the performance of this method is highly sensitive to the magnetic coupling and the load parameters, whose variations cause the system to change its resonant frequency. In order to resolve the sensitivity problems of the magnetic resonant coupling in Wireless Energy Transfer (WET) systems, an effective method of frequency tuning is proposed. In this paper, the modelling, design, and implementation in a prototype of a two-coil WET system is presented. The system is keeping simultaneously the necessary data transfer between the receiver and transmitter of energy. The operation frequency of the prototype is kept below 100 kHz, while the data channel operates at 2.4 GHz. The application software which allows the tuning of the operating frequency of the prototype is specifically developed. The experimental results show that the WET system prototype together with the data transmission have the capability of tuning to the resonant frequency, or to another calculated one, allowing to achieve the best possible efficiency of the system at the energy transfer.

ACS Style

Elena N. Baikova; Alexandre V. Baikov; Stanimir Valtchev; Rui Melicio. Frequency Tuning of the Resonant Wireless Energy Transfer System. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 2019, 1, 6615 -6620.

AMA Style

Elena N. Baikova, Alexandre V. Baikov, Stanimir Valtchev, Rui Melicio. Frequency Tuning of the Resonant Wireless Energy Transfer System. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. 2019; 1 ():6615-6620.

Chicago/Turabian Style

Elena N. Baikova; Alexandre V. Baikov; Stanimir Valtchev; Rui Melicio. 2019. "Frequency Tuning of the Resonant Wireless Energy Transfer System." IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 1, no. : 6615-6620.

Conference paper
Published: 01 October 2019 in IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society
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Power-Hardware-in-the-Loop system (PHiL) for electric drives application based on power converter with Field Programmable Gate Array-based control system is discussed. PHiL structure is under discussion as well. During the PHiL mathematical model analysis current repeating quality is increased. DC drive was selected for testing.

ACS Style

Mikhail Mudrov; Anatoliy Ziuzev; Konstantin Nesterov; Stanimir Valtchev. DC electrical drive Power-Hardware-in-the-Loop system. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 2019, 1, 5333 -5337.

AMA Style

Mikhail Mudrov, Anatoliy Ziuzev, Konstantin Nesterov, Stanimir Valtchev. DC electrical drive Power-Hardware-in-the-Loop system. IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society. 2019; 1 ():5333-5337.

Chicago/Turabian Style

Mikhail Mudrov; Anatoliy Ziuzev; Konstantin Nesterov; Stanimir Valtchev. 2019. "DC electrical drive Power-Hardware-in-the-Loop system." IECON 2019 - 45th Annual Conference of the IEEE Industrial Electronics Society 1, no. : 5333-5337.

Conference paper
Published: 01 October 2019 in 2019 Electric Vehicles International Conference (EV)
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In the inductive contactless battery charging, the power transfer capability and efficiency are mainly depending on the coupling coefficient (k) between the inductively coupled coils. In this work, the spiral and square coil configurations were experimentally made from litz wire as well as another spiral copper coil. This study investigates the frequency characteristics of these coil configurations in order to analyze the frequency characteristics of the self-inductance and equivalent series resistance of each coil; as well as we measured coefficient k under different conditions based on the air-gap variation between the inductively coupled coils and the misalignment between them. Furthermore, we examined the interoperability between the spiral and square coils configurations. It has been found that the litz spiral coil achieved slightly higher self-inductance with compare to litz square coil and spiral copper coil. Likewise, the square litz coil has slightly high equivalent series resistance with compare to other coils. On the other hand, the copper spiral coil has achieved better k than the other coupling interfaces of the litz wire coils.

ACS Style

Mohammed Al-Saadi; Stanimir Valtchev; Luis Romba; Jose Goncalves; Aurelian Craciunescu. Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging. 2019 Electric Vehicles International Conference (EV) 2019, 1 -5.

AMA Style

Mohammed Al-Saadi, Stanimir Valtchev, Luis Romba, Jose Goncalves, Aurelian Craciunescu. Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging. 2019 Electric Vehicles International Conference (EV). 2019; ():1-5.

Chicago/Turabian Style

Mohammed Al-Saadi; Stanimir Valtchev; Luis Romba; Jose Goncalves; Aurelian Craciunescu. 2019. "Comparison of Spiral and Square Coil Configurations in Wireless Power Transfer System for Contactless Battery Charging." 2019 Electric Vehicles International Conference (EV) , no. : 1-5.

Conference paper
Published: 01 June 2019 in 2019 1st Global Power, Energy and Communication Conference (GPECOM)
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In this paper, a three-phase hybrid rectifier is proposed, employing a boost converter without the addition of isolation transformer and output voltage control. This topology is usually considered to be not viable due to the current interactions. In order to mitigate those interactions, the boost inductor is replaced by a magnetically coupled inductor. The coupled inductor forces the balance between the two interconnected windings, placed at the positive and negative poles, and thus eliminating the current interactions. The results show that the proposed three-phase rectifier does not undergo a current interaction and functions as a hybrid rectifier. Furthermore, it was noted that the proposed rectifier at 20 kW presents an elevated power factor and a low total harmonic distortion.

ACS Style

Jose Teixeira Goncalves; Stanimir Valtchev; Rui Melicio; Mohammed Al-Saadi. Three-Phase Unidirectional Transformerless Hybrid Rectifier with Boost Converter. 2019 1st Global Power, Energy and Communication Conference (GPECOM) 2019, 158 -163.

AMA Style

Jose Teixeira Goncalves, Stanimir Valtchev, Rui Melicio, Mohammed Al-Saadi. Three-Phase Unidirectional Transformerless Hybrid Rectifier with Boost Converter. 2019 1st Global Power, Energy and Communication Conference (GPECOM). 2019; ():158-163.

Chicago/Turabian Style

Jose Teixeira Goncalves; Stanimir Valtchev; Rui Melicio; Mohammed Al-Saadi. 2019. "Three-Phase Unidirectional Transformerless Hybrid Rectifier with Boost Converter." 2019 1st Global Power, Energy and Communication Conference (GPECOM) , no. : 158-163.

Chapter
Published: 01 January 2019 in Design Methodologies and Tools for 5G Network Development and Application
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This chapter presents control methods applied in the operation of the series loaded series resonant (SLSR) power converters in a most efficient operation zone. The choice of the control method is affected by the objective to guarantee suitably the efficiency, being this method in the same time, relatively easy to apply. The first part of the chapter compares three basic principles of regulation: frequency mode (FM), pulse width mode (PWM), and their combination (PWM/FM). Finally, a new method for instantaneous regulation is developed. The proposed technique consists of a simplified observation of a state variable value to limit each portion of supplied energy, depending on the requirement for power in each half period. The result of this regulation is comparable to the current mode (CM) control applied to the hard-switching power converters. The viability of this new regulation method is demonstrated by simulations of its analogue circuit implementations and experimentally proved. The circuit is also prepared for the changes in the magnetic coupling (contactless energy transfer).

ACS Style

Stanimir Valtchev; Svilen S. Valtchev. Control for the Contactless Series Resonant Energy Converter. Design Methodologies and Tools for 5G Network Development and Application 2019, 102 -140.

AMA Style

Stanimir Valtchev, Svilen S. Valtchev. Control for the Contactless Series Resonant Energy Converter. Design Methodologies and Tools for 5G Network Development and Application. 2019; ():102-140.

Chicago/Turabian Style

Stanimir Valtchev; Svilen S. Valtchev. 2019. "Control for the Contactless Series Resonant Energy Converter." Design Methodologies and Tools for 5G Network Development and Application , no. : 102-140.