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1
Hamadou, Aissatou. "Implementation of direct current to direct current converter exploiting power amplifier". Annals of Electrical and Electronic Engineering 3, n. 3 (marzo 2020): 1–7. http://dx.doi.org/10.21833/aeee.2020.02.002.
Abstract (sommario):
In the last years, RF power amplifiers are taking advantage of the switched dc-dc converters to use them in several architectures that may improve the efficiency of the amplifier, keeping good linearity. In this study a DC-DC power converter design suitable for high-frequency applications by using a class E power amplifier (Inverter), instead of using small battery values choosing Radio Frequency (RF) values and getting high efficiency of output voltage and a maximum of current and voltage values between 0-9 mW of power input in rectifier, the class E power amplifier designed by using GaN HEMT device and the power added efficiency of 64% after getting optimization of matching network and the gain is 14.4 dBm.
2
Hamadou, Aissatou. "Implementation of direct current to direct current converter exploiting power amplifier". Annals of Electrical and Electronic Engineering 3, n. 3 (marzo 2020): 1–7. http://dx.doi.org/10.21833/aeee.2020.03.001.
Abstract (sommario):
In the last years, RF power amplifiers are taking advantage of the switched dc-dc converters to use them in several architectures that may improve the efficiency of the amplifier, keeping good linearity. In this study a DC-DC power converter design suitable for high-frequency applications by using a class E power amplifier (Inverter), instead of using small battery values choosing Radio Frequency (RF) values and getting high efficiency of output voltage and a maximum of current and voltage values between 0-9 mW of power input in rectifier, the class E power amplifier designed by using GaN HEMT device and the power added efficiency of 64% after getting optimization of matching network and the gain is 14.4 dBm.
3
Liu, Zhengxin, Jiuyu Du e Boyang Yu. "Design Method of Double-Boost DC/DC Converter with High Voltage Gain for Electric Vehicles". World Electric Vehicle Journal 11, n. 4 (7 ottobre 2020): 64. http://dx.doi.org/10.3390/wevj11040064.
Abstract (sommario):
Direct current to direct current (DC/DC) converters are required to have higher voltage gains in some applications for electric vehicles, high-voltage level charging systems and fuel cell electric vehicles. Therefore, it is greatly important to carry out research on high voltage gain DC/DC converters. To improve the efficiency of high voltage gain DC/DC converters and solve the problems of output voltage ripple and robustness, this paper proposes a double-boost DC/DC converter. Based on the small-signal model of the proposed converter, a double closed-loop controller with voltage–current feedback and input voltage feedforward is designed. The experimental results show that the maximum efficiency of the proposed converter exceeds 95%, and the output voltage ripple factor is 0.01. Compared with the traditional boost converter and multi-phase interleaved DC/DC converter, the proposed topology has certain advantages in terms of voltage gain, device stress, number of devices, and application of control algorithms.
4
Uma Maheswari, S., e K. V. Kandasamy. "Development of Zeta Converter for Permanent Magnet Brushless Direct Current Motor". Applied Mechanics and Materials 573 (giugno 2014): 102–7. http://dx.doi.org/10.4028/www.scientific.net/amm.573.102.
Abstract (sommario):
Converter plays a vital role in modern transferable electronic devices and systems. In the battery operated transferable devices, the battery supplies an input voltage to the converter which in turn converts into the desired voltage. Buck-boost, Cuk, SEPIC and Zeta converter are meeting the operational requirements of DC-DC converters. The DC-DC converters are used in both buck function as well as boost function. But the advantage of Zeta converter is that, it does not suffer the polarity reversal problem. The aim of the proposed work is to design a Zeta converter which can be used to drive the Permanent Magnet Brushless Direct Current Motor. The proposed Zeta converter is suggested to control the speed of the Permanent Magnet Brushless Direct Current Motor, according to the generated switching sequence. The proposed work is generally used for low power applications and occasionally used for medium power applications.
5
Upendar, Jalla, Sangem Ravi Kumar, Sapavath Sreenu e Bogimi Sirisha. "Implementation and study of fuzzy based KY boost converter for electric vehicle charging". International Journal of Applied Power Engineering (IJAPE) 11, n. 1 (1 marzo 2022): 98. http://dx.doi.org/10.11591/ijape.v11.i1.pp98-108.
Abstract (sommario):
Elecetric vehicle batteries require direct current (DC) current for charging; hence the circuit alternating current (AC) is converted to DC by a battery charger. Battery charger mostly consists of a rectifier and DC-DC converter with a controller built in to serve as a protective circuit. A harmonic source load is a type of electric car charger. During the AC-DC change over method, harmonic current is introduced into the power system, affecting power quality. In this study, a charging station consisting of buck boost and a charging station consisting a KY Boost converter were simulated. To maintain output voltage of DC-DC converters constant controller is used, the controller is either PI or fuzzy logic controller. So, four models are developed and simulated which are buck-boost converter controlled by proportional-integral (PI)-controller, KY-boost converter controlled by proportional integral-controller, buck boost converter controller fuzzy logic controller and KY boost-converter controlled by fuzzy logic controller. The total harmonic distortion (THD) of the four models is compared.
6
Sutikno, Tole, Ahmad Saudi Samosir, Rizky Ajie Aprilianto, Hendril Satrian Purnama, Watra Arsadiando e Sanjeevikumar Padmanaban. "Advanced DC–DC converter topologies for solar energy harvesting applications: a review". Clean Energy 7, n. 3 (6 maggio 2023): 555–70. http://dx.doi.org/10.1093/ce/zkad003.
Abstract (sommario):
Abstract In this study, the advanced topologies of a DC–DC converter for applications involving the harvesting of solar energy are discussed. This work’s primary contribution is a guide for choosing the most effective topology for a DC–DC converter when developing solar energy collection systems. Several topologies of a DC–DC converter for solar energy harvesting applications are compared in terms of the range of power levels they can oversee, the complexity of the underlying hardware, the cost of implementation, the tracking efficiency and the overall efficiency of the converter. This article explains five innovative approaches for adapting boost converters to function as standard DC–DC converters to capture solar energy, consisting of (i) voltage-multiplier cell, (2) coupled inductor, (3) coupled inductor and switch capacitor, (4) cascaded topology and (5) voltage-lift technique. Because of the boost converter’s restrictions, it is necessary to deliver high performance. The comparison findings demonstrate that the voltage-lift-based boost-converter topology performs more effectively than the alternatives. In conclusion, the information presented in this paper can be utilized when developing solar energy collection systems to determine the sort of direct current to direct current converter that will be most effective.
7
Erat, Abdurrahim, e Ahmet Mete Vural. "DC/DC Modular Multilevel Converters for HVDC Interconnection: A Comprehensive Review". International Transactions on Electrical Energy Systems 2022 (8 settembre 2022): 1–49. http://dx.doi.org/10.1155/2022/2687243.
Abstract (sommario):
High voltage direct current (HVDC) technology is a key component in power systems owing to huge benefits such as long-distance power transmission, lower losses, asynchronous grid interconnections, controllability, system availability, and limited short-circuit currents. HVDC transmission is a cost-effective method of transporting huge amounts of power across long distances with little loss. It can also link asynchronous alternative current (AC) networks while balancing the grid. DC/DC converters are one of the most important components for HVDC power transmission, and DC/DC modular multilevel converters (MMCs) are the backbone of HVDC grid interconnections. The DC/DC MMC is a highly regarded converter architecture for medium/high-voltage DC grid interconnection. DC/DC MMC topologies play a key role in modern HVDC networks with varying voltage levels. This paper’s fundamental aim is to offer a recent comprehensive review of HVDC topologies, current DC/DC modular multilevel converter (MMC) topologies for HVDC interconnection, and DC/DC MMC control techniques.
8
J.S., Nancy Mary, Inba Rexy A. e Yuvarani K. "KY Converter Fed Dc Motor For Low Power Application". E3S Web of Conferences 430 (2023): 01273. http://dx.doi.org/10.1051/e3sconf/202343001273.
Abstract (sommario):
This paper aims to design and to simulate a various DC-DC Converter with closed loop control. DC-DC converter is electronic co converter converts direct current source from one voltage to the level voltage. It is a type of electric power converter. The range of power vary from very low to very high. MATLAB Simulink has been used in modelling and simulation of the circuits. We have analysed the closed loop control of various DC-DC converters like buck, boost, buck-boost and KY converters using MATLAB Simulink. The KY converter is chose for the low power application and the same was designed and simulated.
9
R, Mr Bharath. "Design of Buck DC-DC Converter Space Application". International Journal for Research in Applied Science and Engineering Technology 10, n. 7 (31 luglio 2022): 1790–94. http://dx.doi.org/10.22214/ijraset.2022.45543.
Abstract (sommario):
Abstract: The buck converter is a power electronic device which converts the higher level of input voltage to lower level of output voltage. For space applications, several tests were performed on direct current (DC) to (DC) converters to evaluate potential performance and reliability issues in space use of DC to DC converters and to determine if the use of electromagnetic interference (EMI) filters mitigates concerns observed during tests. Test findings reported here include those done up until January–June 2022. Tests performed include efficiency, regulation, load regulation, power consumption with inhibit on, load transient response, synchronization, and turn-on tests. Some of the test results presented here span the thermal range -20°C to 55°C. Lower range was extended to -40°C in some tested converters.
10
Alsokhiry, Fahad, e Grain Philip Adam. "Multi-Port DC-DC and DC-AC Converters for Large-Scale Integration of Renewable Power Generation". Sustainability 12, n. 20 (13 ottobre 2020): 8440. http://dx.doi.org/10.3390/su12208440.
Abstract (sommario):
Numerous research studies on high capacity DC-DC converters have been put forward in recent years, targeting multi-terminal medium-voltage direct current (MVDC) and high-voltage direct current (HVDC) systems, in which renewable power plants can be integrated at both medium-voltage (MV) and high-voltage (HV) DC and AC terminals; hence, leading to complex hybrid AC-DC systems. Multi-port converters (MPCs) offer the means to promote and accelerate renewable energy and smart grids applications due to their increased control flexibilities. In this paper, a family of MPCs is proposed in order to act as a hybrid hub at critical nodes of complex multi-terminal MVDC and HVDC grids. The proposed MPCs provide several controllable DC voltages from constant or variable DC or AC voltage sources. The theoretical analysis and operation scenarios of the proposed MPC are discussed and validated with the aid of MATLAB-SIMULINK simulations, and further corroborated using experimental results from scale down prototype. Theoretical analysis and discussions, quantitative simulations, and experimental results show that the MPCs offer high degree of control flexibilities during normal operation, including the capacity to reroute active or DC power flow between any arbitrary AC and DC terminals, and through a particular sub-converter with sufficient precision. Critical discussions of the experimental results conclude that the DC fault responses of the MPCs vary with the topology of the converter adopted in the sub-converters. It has been established that a DC fault at high-voltage DC terminal exposes sub-converters 1 and 2 to extremely high currents; therefore, converters with DC fault current control capability are required to decouple the healthy sub-converters from the faulted one and their respective fault dynamics. On the other hand, a DC fault at the low-voltage DC terminal exposes the healthy upper sub-converter to excessive voltage stresses; therefore, sub-converters with bipolar cells, which possess the capacity for controlled operation with variable and reduced DC voltage over wide range are required. In both fault causes, continued operation without interruption to power flow during DC fault is not possible due to excessive over-current or over-voltage during fault period; however, it is possible to minimize the interruption. The above findings and contributions of this work have been further elaborated in the conclusions.
11
Liu, Junyi, Yanfang Fan, Junjie Hou e Xueyan Bai. "Reliability Evaluation of DC/DC Converter in Direct Current Collection System of Wind Farm Considering the Influence of Control Strategy". Processes 11, n. 10 (25 settembre 2023): 2825. http://dx.doi.org/10.3390/pr11102825.
Abstract (sommario):
The DC collection system of wind farms can effectively solve the problems of harmonic resonance and reactive power transmission in large-scale wind power AC collection systems, and has broad development prospects. The DC/DC converter is critical equipment in the wind farm DC collection system, and its reliability is related to the entire collection system’s safe and stable operation. The reliability of DC/DC converters is affected by factors such as system operating conditions and control strategies. Based on this, a reliability evaluation model for boost full-bridge isolated (BFBIC) DC/DC converters is proposed from the device level to the submodule level and then to the equipment level, incorporating operating conditions and control strategies into reliability analysis. Firstly, in device-level reliability modeling, the impact of DC/DC converter operating conditions and control strategies on insulated gate bipolar transistor (IGBT) module losses and junction temperature fluctuations are considered. Secondly, fault tree analysis (FTA) is used to establish the reliability model of the BFBIC submodule and DC/DC converter. In the end, we verify the effectiveness of the proposed model through a numerical example, and provide solid data support for analyzing the reliability of the wind farm DC collection system.
12
Sivapriyan, R., e D. Elangovan. "Impedance-Source DC-to-AC/DC Converter". Electronics 8, n. 4 (16 aprile 2019): 438. http://dx.doi.org/10.3390/electronics8040438.
Abstract (sommario):
This article presents a novel impedance-source-based direct current (DC)-to-alternating current (AC)/DC converter (Z-Source DAD Converter). The Z-Source DAD converter converts the input DC voltage into AC or DC with buck or boost in the load voltage. This Z-Source DAD conversion circuit is a single-stage power conversion system. This converter circuit converts the input DC voltage into variable-magnitude output DC voltage or converts the DC voltage into a variable-magnitude output AC voltage. The higher voltage magnitude in boost mode can be controlled by controlling the shoot-through (ST) state timing of the converter. MATLAB-Simulink simulation and microcontroller-based hardware circuit results are presented to demonstrate power conversion with the buck and boost features of the Z-Source DAD converter for both types of output voltages. The simulation and experimental results show that the Z-Source DAD converter converts the given DC supply into AC or DC with buck or boost in the output load voltage.
13
Wang, Shifeng, Xueyong Ding e Qingji Tan. "Application of DC-DC Converter in Sensor and MEMS Device Integration and Packaging". Journal of Sensors 2022 (22 settembre 2022): 1–11. http://dx.doi.org/10.1155/2022/7834718.
Abstract (sommario):
DC-DC (direct current controlled direct current) converter is the core control circuit in the field of power electronics technology. Based on the theory of sensors and MEMS (microelectromechanical systems), this paper constructs a DC-DC converter device integration and packaging model and proposes an enhanced current equalization technology with offset correction function suitable for two-phase DC-DC converters. Aiming at the generation mechanism of the output ripple of the two-phase DC-DC converter, the model adopts the ripple elimination technology based on the interleaved synchronous clock and the self-calibration interleaved time generator, so that each phase of the converter is accurately staggered within the full-load range, and the problem of output ripple amplitude is solved. During the simulation process, a high-performance two-phase DC-DC converter chip is designed and implemented, which includes an adaptive on-time control logic based on ripple feedback, a self-calibrating zero-current turn-off circuit, and a robust power switch transistor drive logic. The experimental results show that the full-load current of the chip reaches 6A, the peak efficiency is 91%, the phase-to-phase current error is <0.6%, and the output ripple is <9 mV. In the 90.265 V AC input, 0-10 W load range, the output voltage error is less than 0.96%, when the load is switched between no-load and full-load, and the system response speed is less than 200 ps, which effectively improves the overall performance of the DC-DC converter.
14
Mahalingam, Kalarathi, e Gnanavadivel Jothimani. "An elevated gain DC-DC converter with active switched inductor for PV application". International Journal of Power Electronics and Drive Systems (IJPEDS) 14, n. 2 (1 giugno 2023): 892. http://dx.doi.org/10.11591/ijpeds.v14.i2.pp892-897.
Abstract (sommario):
Innovative power electronic converters have emerged because of renewable energy expansion in the past two decades. Direct current DC grids can operate independently or connected to power grids. A DC grid has distributed generation (DG) units, such as solar panels and, fuel cells. It is necessary to have a DC-DC converter in DC grids to raise output voltage. Boost converters have limited voltage gain, and their switching stress is often equal to their output voltage. This work proposes a converter which gives high gain and less stress when compared to other recent converters. At 0.8 duty ratio, this converter produces an elevated gain of 59. An experimental prototype is built for the proposed converter and the results are presented.
15
Prameswari, Nungky, Anand Bannet Ganesen, Falah Kharisma Nuraziz, Jihad Furqani, Arwindra Rizqiawan e Pekik Argo Dahono. "Simplified cascade multiphase DC-DC buck power converter for low voltage large current applications: part II --- output current controller". International Journal of Power Electronics and Drive Systems (IJPEDS) 12, n. 4 (1 dicembre 2021): 2273. http://dx.doi.org/10.11591/ijpeds.v12.i4.pp2273-2283.
Abstract (sommario):
<span lang="EN-US">This paper proposes a control method for new simplified cascade multiphase direct current-direct current (DC-DC) buck power converters used for low-voltage large-current applications such as cathodic protection. To control the proposed converter, a proportional-integral (PI) controller is used to regulate the output current of the converter. The control scheme analysis is carried out by linearizing the small-signal model of the proposed converter to form the output current transfer functions. This transfer function will be analyzed by using phase and gain margin approach to obtain the control parameters (Kp, Ki, and Ti). Simulation and experiment results are included to show the validity of the proposed concept.</span>
16
Can, Erol. "A Common Capacitor Hybrid Buck-Boost Converter". Jordan Journal of Electrical Engineering 9, n. 1 (2023): 71. http://dx.doi.org/10.5455/jjee.204-1666615450.
Abstract (sommario):
DC-DC converters are electronic circuit elements that are frequently used to change the direct current (DC) level. This paper presents a hybrid buck-boost converter - with constant modulation index - that can change a DC voltage at two directions compared to the conventional buck-boost DC-DC converters. First, the circuit structure and operation are given. Then, the performance of the proposed converter is tested on resistive and inductive loads, and compared with that of conventional buck-boost converters. The obtained results demonstrate the effectiveness of the proposed converter. They unveil that the proposed converter - compared to the conventional buck-boost converters – produces a higher and flexible rate of conversion without changing the operating ratio of the switches. Moreover, the proposed converter is able to change the voltage on double way on load for a constant operating ratio, while the traditional converters provide a one-way conversion.
17
Mahmood, Adil Hasan, Mustafa F. Mohammed, Mohammed Omar e Ali H. Ahmad. "Single phase inverter fed through a regulated SEPIC converter". Bulletin of Electrical Engineering and Informatics 10, n. 6 (1 dicembre 2021): 2921–28. http://dx.doi.org/10.11591/eei.v10i6.2853.
Abstract (sommario):
In power electronics, it is necessary to select the best converter circuit topology that has good performance among different converters. The single-ended primary inductor converter (SEPIC) has good performance and is advantageous among different direct current/direct current (DC/DC) converters. In this paper, a design of a SEPIC converter is made by selecting the values of its components according to the required output voltage and power. The design is made by an assumption that both of its inductors have the same value. The converter is tested by using MATLAB Simulink successfully. Later, its output voltage is regulated by using a proportional integral (PI-controller) through tuning its proportional and integral gains. Finally, the SEPIC converter is connected to a single-phase full-bridge inverter to supply its required DC voltage. The role of the SEPIC converter is to regulate the dc-link voltage between its output side and the inverter. The results showed the success of this connection to supply alternating current (AC) loads with low total harmonic distortion (THD).
18
Han, Zhilu, Guangzhu Wang, Yuhui Liu e Wenjie Guo. "High Step-Up Resonant DC–DC Converter With Resonant Network for Electrical Collection Systems". Journal of Physics: Conference Series 2260, n. 1 (1 aprile 2022): 012012. http://dx.doi.org/10.1088/1742-6596/2260/1/012012.
Abstract (sommario):
Abstract The efficiency of renewable energy electrical collection can be effectively improved by adopting the high voltage direct current (HVDC) electrical collection method. The low-voltage DC power is stepped up to the high-voltage level for HVDC transmission by one-stage step-up type, which can reduce the cost of high-voltage large-capacity DC-DC converters. However, the high cost of DC-DC converters which can achieve high step-up ratio, such as modular multilevel converter (MMC), limits the development of the one-stage step-up type. In this paper, a low-cost DC-DC converter with high step-up ratio which can realize the bidirectional flow of energy is proposed. The total step-up ratio is the product of high-frequency transformer ratio, resonant network gain and step-up ratio of voltage doubler rectifier circuit. Meanwhile, the direct power factor control (DPFC) strategy is proposed based on the idea of controlling active power to achieve the goal of controlling output voltage. Finally, the step-up ratio of the DC-DC converter can reach 160 times, and realize zero-voltage switching (ZVS) turn-on of the switches and zero-current switching (ZCS) turn-off of the diodes.
19
Piasecki, Szymon, Jaroslaw Zaleski, Marek Jasinski, Serafin Bachman e Marek Turzyński. "Analysis of AC/DC/DC Converter Modules for Direct Current Fast-Charging Applications". Energies 14, n. 19 (5 ottobre 2021): 6369. http://dx.doi.org/10.3390/en14196369.
Abstract (sommario):
The paper is a comprehensive laboratory comparison study of two galvanic isolated solution off-board battery chargers: (1) Si-based cost-effective case, and (2) SiC-bidirectional ready for vehicle to grid concept case. All circuits are modular, and in both cases the DC/DC converter can be replaced according to the end user requirements (the coupled transformer remains the same and is constructed based on 12xC100 cores to avoid additional choke). In the case of single active bridge, an active RCD snubber is proposed to protect against overvoltage above 1kV in the DC_2 circuit. The dual active bridge is equipped with soft-star modulation using a zero vector to reduce in-rush current in case of no-load operation, while the AC/DC grid connected converter remains bidirectional to assure the highest power quality at the point of common coupling. All tests were made with real second-used batteries, which improves environmental, economic and technical feasibility of such systems for prosumers. The total efficiency of both AC/DC/DC converters (>97% in SiC and >94% in Si versions) was investigated in the same laboratory conditions.
20
Zhang, Hailong, Yafei Chen, Sung-Jun Park e Dong-Hee Kim. "A Family of Bidirectional DC–DC Converters for Battery Storage System with High Voltage Gain". Energies 12, n. 7 (3 aprile 2019): 1289. http://dx.doi.org/10.3390/en12071289.
Abstract (sommario):
In low power energy storage systems, to match the voltage levels of the low-voltage battery side and high-voltage direct current (DC) bus, a high voltage gain converter with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper proposes a set of bidirectional converters with high voltage gain range based on the integration of the boost converter with a Ćuk converter, single ended primary inductor converter (Sepic), and buck-boost converter. The proposed converters consist of a small number of components with a high voltage gain ratio. Detailed comparisons are made with respect to the operating mode, number of components, voltage, and current ripple and efficiency. The efficiency of proposed converters are higher than the conventional converters in entire power range, and 6% higher efficiency can be achieved in large duty cycle by calculating loss analysis. To verify performances of the proposed converters, three 200-W prototypes of the converters are developed under the same experimental conditions. The results revealed that converter I exhibits the highest efficiency in the boost mode (92%) and buck mode (92.2%). The experimental results are shown to verify the feasibility and performances of the set of converters.
21
S, Chellam, Kuruseelan S e Jasmine Gnanamalar A. "Wind Energy Conversion System using Cascading H-Bridge Multilevel Inverter in High Ripple Scenario". International Journal of Electrical and Electronics Research 12, n. 1 (15 marzo 2024): 178–86. http://dx.doi.org/10.37391/ijeer.120126.
Abstract (sommario):
This paper presents wind energy conversion system using CHB MLI and phase interleaved boost converter to overcome high voltage and current ripple. Developments in power electronics technology have a direct impact on advances in wind energy conversion systems. WECS output voltage may fluctuate depending on wind speed. For WECS to maintain a constant output voltage, a power converter is required. This paper explains how to configure a phase-interleaved boost converter and voltage controller to maintain a stable intermediate circuit voltage in the system. The proposed cascading H-bridge multilevel inverter (CHB MLI) converts DC/AC using a novel topology. Separate DC sources are not utilizing the suggested topology. Multi-level inverters are operated by specific harmonic disposal pulse width modulation, or SHE-PWM are utilized. PMSG voltage, CHB-MLI voltage, boost converter voltage and rotor speed have seven different levels of simulated waveforms. Among the many advantages of three-phase alternating DC-DC boost converters, that are high efficiency, fast dynamics and very low current ripple. The output voltage is increased to 400 V using a three-phase interleaving converter, which also maintains a higher efficiency of about 98%. DC-DC power converters have proven to be essential components of many applications and topologies. The interleaving technique is necessary to address the main disadvantages of DC-DC power converters: increased voltage, reduced efficiency, and rippled current. Interleaved boost converters have several advantages, including lower switching losses, lower voltage and current ripple, increased efficiency, and more. To improve the converter's overall functionality, the "n" parallel converter is connected through an interleaved boost converter. This paper presents a performance analysis of a multiphase alternating boost converter to reduce high voltage and current ripple. MATLAB/Simulink is used for analysis and simulation of phase-interleaved boost converters.
22
Rehman, Bilawal, Atiq Ur Rehman, Waqar Ahmad Khan, Jan Muhammad e Syed Mudassir Hussain. "Estimation of multi-infeed HVDC inter converter direct current interaction in close electric proximity". Mehran University Research Journal of Engineering and Technology 42, n. 2 (28 marzo 2023): 10. http://dx.doi.org/10.22581/muet1982.2302.02.
Abstract (sommario):
This paper aims at investigating the direct current interaction between various converters of High Voltage Direct Current (HVDC) system, which lie in close electric proximity within the multi-infeed configuration. The interaction between converters in multi-infeed DC system are highly possible events which need to be evaluated in order to avoid the adverse operational results. The various indices such as multi-infeed interaction factor (MIIF) considering AC busbar voltages, local and concurrent commutation failures (CF) in converter stations under different AC disturbances, influence of AC system’s strength on fault recovery time (FRT), transient over-voltage (TOV) under permanent DC faults, voltage and power stability of multi-infeed DC system are comprehensively illustrated in literatures. However, there is lack of literature regarding the investigation of current interaction in multi-infeed DC system. Therefore, in this paper, a power flow approach is adopted to estimate the inter converter direct current interaction. An index, multi-infeed current interaction factor (MICIF) is proposed that can effectively depicts the interaction between converters. The MICIF index is verified through electromagnetic transient simulations of dual infeed HVDC system developed in PSCAD/EMTDC. The results show that MICIF index can accurately assess the interaction between different converter stations of HVDC system under steady and transient states.
23
Prakash, Ch S. V., K. Kalyani e B. Sankara Prasad. "Interleaved DC-DC Converter Based BL Buckboost Converter Fed BLDC Drive". Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, n. 4 (30 aprile 2015): 18–26. http://dx.doi.org/10.53555/nneee.v2i4.205.
Abstract (sommario):
In this paper an improved BL Buck-Boost PFC converter fed brushless direct current (BLDC) motor drive for desired speed applications has been presented. The additional inductance and power semiconductor switches gives the advantages over the conventional circuit configuration. The reliability of the circuit gets improved by proposed model. Voltage source inverter (VSI) is used to reduce the losses across the power switches. The performance of the proposed BLDC motor is evaluated over a wide range of speed control and observed in MATLAB/Simulation environment.
24
Billy, Ibraheem Jawad, e Jasim Farhood Hussein. "Design high voltage gain DC converter based on maximum power point resistance for photovoltaic applications". Bulletin of Electrical Engineering and Informatics 12, n. 4 (1 agosto 2023): 2017–31. http://dx.doi.org/10.11591/beei.v12i4.4616.
Abstract (sommario):
Due to the nonlinear properties of photovoltaic (PV) modules, the design of the high-gain direct current (DC) converter for maximum power point tracking (MPPT) is complicated. In this paper, the design of a new step-up DC converter for MPPT applications is proposed. The proposed converter is structured of two symmetrical reverse-parallel DC-DC boost converters. This structure is supported by voltage multiplier cells equipped to increase output voltage and decrease voltage stress on semiconductor switches. To simplify the high-gain DC converter design, the PV module's maximum power point is treated as resistance by using the incremental conductance (INC) method. The MPPT boost converter's inductance, input capacitance, and output capacitance are calculated using the derived equations using nine parameters. The results showed that the proposed DC converter simulation meets the necessary requirements. The size of the input capacitor, inductor, and output capacitor have been decreased. When the proposed converter is compared to a traditional converter, there is less voltage stress, low current ripple, and an increase in voltage gain. This has led to an improvement in the overall converter efficiency.
25
Billy, Ibraheem Jawad, e Jasim Farhood Hussein. "Design high voltage gain DC converter based on maximum power point resistance for photovoltaic applications". Bulletin of Electrical Engineering and Informatics 12, n. 4 (1 agosto 2023): 2017–31. http://dx.doi.org/10.11591/eei.v12i4.4616.
Abstract (sommario):
Due to the nonlinear properties of photovoltaic (PV) modules, the design of the high-gain direct current (DC) converter for maximum power point tracking (MPPT) is complicated. In this paper, the design of a new step-up DC converter for MPPT applications is proposed. The proposed converter is structured of two symmetrical reverse-parallel DC-DC boost converters. This structure is supported by voltage multiplier cells equipped to increase output voltage and decrease voltage stress on semiconductor switches. To simplify the high-gain DC converter design, the PV module's maximum power point is treated as resistance by using the incremental conductance (INC) method. The MPPT boost converter's inductance, input capacitance, and output capacitance are calculated using the derived equations using nine parameters. The results showed that the proposed DC converter simulation meets the necessary requirements. The size of the input capacitor, inductor, and output capacitor have been decreased. When the proposed converter is compared to a traditional converter, there is less voltage stress, low current ripple, and an increase in voltage gain. This has led to an improvement in the overall converter efficiency.
26
Santos, Arthur, Gerald Duggan, Stephen Frank, Daniel Gerber e Daniel Zimmerle. "Endpoint Use Efficiency Comparison for AC and DC Power Distribution in Commercial Buildings". Energies 14, n. 18 (16 settembre 2021): 5863. http://dx.doi.org/10.3390/en14185863.
Abstract (sommario):
Advances in power electronics and their use in Miscellaneous Electric Loads (MELs) in buildings have resulted in increased interest in using low-voltage direct current (DC) power distribution as a replacement for the standard alternating current (AC) power distribution in buildings. Both systems require an endpoint converter to convert the distribution system voltage to the MELs voltage requirements. This study focused on the efficiency of these endpoint converters by testing pairs of AC/DC and DC/DC power converters powering the same load profile. In contrast to prior studies, which estimated losses based on data sheet efficiency and rated loads, in this study, we used part load data derived from real-world time-series load measurements of MELs and experimentally characterized efficiency curves for all converters. The measurements performed for this study showed no systematic efficiency advantage for commercially available DC/DC endpoint converters relative to comparable, commercially available AC/DC endpoint converters. For the eight appliances analyzed with the pair of converters tested, in 50%, the weighted energy efficiency of the DC/DC converter was higher, while, for the other 50%, the AC/DC converter was. Additionally, the measurements indicated that the common assumption of using either data sheet efficiency values or efficiency at full load may result in substantial mis-estimates of the system efficiency.
27
Sarvi, M., I. Soltani, N. NamazyPour e N. Rabbani. "A New Sliding Mode Controller for DC/DC Converters in Photovoltaic Systems". Journal of Energy 2013 (2013): 1–7. http://dx.doi.org/10.1155/2013/871025.
Abstract (sommario):
DC/DC converters are widely used in many industrial and electrical systems. As DC/DC converters are nonlinear and time-variant systems, the application of linear control techniques for the control of these converters is not suitable. In this paper, a new sliding mode controller is proposed as the indirect control method and compared to a simple direct control method in order to control a buck converter in photovoltaic applications. The solar arrays are dependent power sources with nonlinear voltage-current characteristics under different environmental conditions (insolation and temperature). From this point of view, the DC/DC converter is particularly suitable for the application of the sliding mode control in photovoltaic application, because of its controllable states. Simulations are performed in Matlab/Simulink software. The simulation results are presented for a step change in reference voltage and input voltage as well as step load variations. The simulations results of proposed method are compared with the conventional PID controller. The results show the good performance of the proposed sliding mode controller. The proposed method can be used for the other DC/DC converter.
28
Talebzadeh, Sarah, e Omid Beik. "Spacecraft Medium Voltage Direct-Current (MVDC) Power and Propulsion System". Electronics 13, n. 10 (7 maggio 2024): 1810. http://dx.doi.org/10.3390/electronics13101810.
Abstract (sommario):
This paper introduces a medium voltage direct-current (MVDC) system for large spacecraft megawatt-scale (MW) power and propulsion systems intended for interplanetary transport, including missions to the Moon and Mars. The proposed MVDC system includes: (i) A nuclear electric propulsion (NEP) that powers a permanent magnet (PM) generator whose output is rectified and connected to the MVDC bus. (ii) A solar photovoltaic (PV) source that is interfaced to the MVDC bus using a unidirectional boost DC-DC converter. (iii) A backup battery energy storage system (BESS) that connects to the MVDC bus using a bidirectional DC-DC boost converter. (iv) A dual active bridge (DAB) converter that controls the power to the spacecraft’s electric thruster. The NEP serves as the main power source for the spacecraft’s electric thruster, while the solar PV and BESS are intended to provide power for the payload and spacecraft’s low-voltage power system. The paper will (i) provide a review of the spacecraft MVDC power and prolusion system highlighting state-of-the-art main components, (ii) address the control of boost converters for the PV and BESS sources and the DAB converter for the thruster, and (iii) propose an uncertainty and disturbance estimator (UDE) concept based on current control algorithms to mitigate MVDC instability due to unpredictable factors and external disruptions. The proposed UDE can actively estimate and compensate for the system disturbance and uncertainty in real time, and thus, both the system tracking performance and robustness can be improved. Simulation studies have been conducted to substantiate the efficacy of the proposed schemes.
29
Saputra, Masramdhani, Gian Fikih Yustiawan, Imron Ridzki, Sigit Setya Wiwaha e Binar Surya Gumilang. "Perancangan Dan Implementasi Half Bridge Dc – Dc Converter Dengan Kendali Arus Hysteresis". Elposys: Jurnal Sistem Kelistrikan 10, n. 1 (6 marzo 2023): 72–77. http://dx.doi.org/10.33795/elposys.v10i1.1006.
Abstract (sommario):
DC-DC Converter is a direct voltage (DC) power supply device that is produced by converting DC input voltage into a lower or higher DC output voltage. In its development, the application of DC-DC Converter allows an electronic device to function with a small energy source, where the output voltage can be varied as needed. DC-DC Converters have been widely developed because they have various advantages, including: simpler form and has high efficiency. In this thesis, an Arduino Mega 2560-based current controller will be implemented. The type of current controller implemented is hysteresis current control with the well-known, tested and proven considerations. Current control works if the inductor current rises from the lower limit of the hysteresis band to the upper limit then the switch will be turned off (inductor current above the upper reference Ip.Ref) and if this current drops from the upper limit to the lower limit the switch will be turned on (current inductor under low frequency Iv.Ref). This current control also has advantages in overcurrent protection such as when there is a short circuit in the load.
30
El-Shahat, Adel, e Sharaf Sumaiya. "DC-Microgrid System Design, Control, and Analysis". Electronics 8, n. 2 (24 gennaio 2019): 124. http://dx.doi.org/10.3390/electronics8020124.
Abstract (sommario):
Recently direct current (DC) microgrids have drawn more consideration because of the expanding use of direct current (DC) energy sources, energy storages, and loads in power systems. Design and analysis of a standalone solar photovoltaic (PV) system with DC microgrid has been proposed to supply power for both DC and alternating current (AC) loads. The proposed system comprises of a solar PV system with boost DC/DC converter, Incremental conductance (IncCond) maximum power point tracking (MPPT), bi-directional DC/DC converter (BDC), DC-AC inverter and batteries. The proposed bi-directional DC/DC converter (BDC) lessens the component losses and upsurges the efficiency of the complete system after many trials for its components’ selection. Additionally, the IncCond MPPT is replaced by Perturb & Observe (P&O) MPPT, and a particle swarm optimization (PSO) one. The three proposed techniques’ comparison shows the ranking of the best choice in terms of the achieved maximum power and fast—dynamic response. Furthermore, a stability analysis of the DC microgrid system is investigated with a boost converter and a bidirectional DC-DC converter with the Lyapunov function for the system has been proposed. The complete system is designed and executed in a MATLAB/SIMULINK environment and validated utilizing an OPAL real-time simulator.
31
CH.S.V Prakash, K kalyani e B. Sankara prasad. "INTERLEAVED DC-DC CONVERTER BASED BL BUCK-BOOST CONVERTER FED BLDC DRIVE". Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, n. 2 (28 febbraio 2015): 26–33. http://dx.doi.org/10.53555/nneee.v2i2.233.
Abstract (sommario):
In this paper an improved BL Buck-Boost PFC converter fed brushless direct current(BLDC) motor drive for desired speed applications has been presented. The additional inductance andpower semiconductor switches gives the advantages over the conventional circuit configuration. Thereliability of the circuit gets improved by proposed model. Voltage source inverter (VSI) is used toreduce the losses across the power switches. The performance of the proposed BLDC motor is evaluatedover a wide range of speed control and observed in MATLAB/Simulation environment
32
Kang, Jin-Wook, Ki-Woong Shin, Hoon Lee, Kyung-Min Kang, Jintae Kim e Chung-Yuen Won. "A Study on Stability Control of Grid Connected DC Distribution System Based on Second Order Generalized Integrator-Frequency Locked Loop (SOGI-FLL)". Applied Sciences 8, n. 8 (16 agosto 2018): 1387. http://dx.doi.org/10.3390/app8081387.
Abstract (sommario):
This paper studies a second order generalized integrator-frequency locked loop (SOGI-FLL) control scheme applicable for 3-phase alternating current/direct current (AC/DC) pulse width modulation (PWM) converters used in DC distribution systems. The 3-phase AC/DC PWM converter is the most important power conversion system of DC distribution, since it can boost 380 Vrms 3-phase line-to-line AC voltage to 700 Vdc DC output with various DC load devices and grid voltages. The direct-quadrature (d-q) transformation, positive sequence voltage extraction, proportional integral (PI) voltage/current control, and phase locked loop (PLL) are necessary to control the 3-phase AC/DC PWM converter. Besides, a digital filter, such as low pass filter and all pass filter, are essential in the conventional synchronous reference frame-phase locked loop (SRF-PLL) method to eliminate the low order harmonics of input. However, they limit the bandwidth of the controller, which directly affects the output voltage and load of 3-phase AC/DC PWM converter when sever voltage fluctuation, such as sag, swell, etc. occurred in the grid. On the other hand, the proposed control method using SOGI-FLL is able to do phase angle detection, positive sequence voltage extraction, and harmonic filtering without additional digital filters, so that more stable and fast transient control is achieved in the DC distribution system. To verify the improvement of the characteristics in the unbalanced voltage and frequency fluctuation of the grid, a simulation and experiment are implemented with 50 kW 3-phase AC/DC PWM converter used in DC distribution.
33
Huo, Xianxu, Ke Xu, Ruixin Liu, Xi Chen, Zhanchun Li e Haiyun Yan. "A Structure-Reconfigurable Soft-Switching DC-DC Converter for Wide-Range Applications". Energies 12, n. 15 (28 luglio 2019): 2905. http://dx.doi.org/10.3390/en12152905.
Abstract (sommario):
In this paper, a structure-reconfigurable resonant DC-DC (direct current – direct current) converter is presented. By controlling the state of the auxiliary switch, the converter could change the resonant structure to acquire a high efficiency and wide voltage gain range simultaneously. The characteristics of the LLC (inductor-inductor-capacitor) resonant converter are firstly analyzed. Based on this, through introducing additional resonant elements and adopting the topology morphing method, the proposed converter can be formed. Moreover, a novel parameter selection method is discussed to satisfy both working states. Then, a detailed loss analysis calculation is conducted to determine the optimal switching point. In addition, an extra resonant zero point is generated by the topology itself, and the inherent over-current protection is guaranteed. Finally, a 500 W prototype is built to demonstrate the theoretical rationality. The output voltage is constant at 400 V even if the input voltage varies from 160 to 400 V. A peak efficiency of 97.2% is achieved.
34
Hasyim, Gifari Iswandi, Sulistyo Wijanarko, Jihad Furqani, Arwindra Rizqiawan e Pekik Argo Dahono. "A current control method for bidirectional multiphase DC-DC boost-buck converter". International Journal of Electrical and Computer Engineering (IJECE) 12, n. 3 (1 giugno 2022): 2363. http://dx.doi.org/10.11591/ijece.v12i3.pp2363-2377.
Abstract (sommario):
<span>In the future, more and more electric vehicle (EV) batteries are connected to the direct current (DC) microgrid. Depending on the battery state of charge, the battery voltage can be higher or lower than the DC microgrid voltage. A converter that is aimed to fulfil such function must be capable of working in both charging and discharging regardless the voltage level of the battery and DC microgrid. Battery performance degradation due to ripple current entering the battery is also a concern. In this paper, a converter that can minimize ripple current that entering battery and operate in two power-flow directions regardless of battery and DC microgrid voltage level is presented. A current control method for this kind of converter was proposed. Experiment on a prototype was conducted to prove the proposed converter current control method.</span>
35
Prakash, Ch S. V., K. Kalyani e B. Sankara Prasad. "Interleaved DC-DC Converter Based BL Buck-Boost Converter Fed BLDC Drive". Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, n. 4 (30 aprile 2015): 26–33. http://dx.doi.org/10.53555/nneee.v2i4.206.
Abstract (sommario):
In this paper an improved BL Buck-Boost PFC converter fed brushless direct current (BLDC) motor drive for desired speed applications has been presented. The additional inductance and power semiconductor switches gives the advantages over the conventional circuit configuration. The reliability of the circuit gets improved by proposed model. Voltage source inverter (VSI) is used to reduce the losses across the power switches. The performance of the proposed BLDC motor is evaluated over a wide range of speed control and observed in MATLAB/Simulation environment.
36
Prakash, Ch S. V., K. Kalyani e B. Sankara Prasad. "Interleaved DC-DC Converter Based BL Buck Boost Converter Fed BLDC Drive". Journal of Advance Research in Electrical & Electronics Engineering (ISSN: 2208-2395) 2, n. 2 (28 febbraio 2015): 18–25. http://dx.doi.org/10.53555/nneee.v2i2.232.
Abstract (sommario):
In this paper an improved BL Buck-Boost PFC converter fed brushless direct current (BLDC) motor drive for desired speed applications has been presented. The additional inductance and power semiconductor switches gives the advantages over the conventional circuit configuration. The reliability of the circuit gets improved by proposed model. Voltage source inverter (VSI) is used to reduce the losses across the power switches. The performance of the proposed BLDC motor is evaluated over a wide range of speed control and observed in MATLAB/Simulation environment.
37
Luo, Zhenxiong, Fan Xie, Bo Zhang e Dongyuan Qiu. "Quantifying the Nonlinear Dynamic Behavior of the DC-DC Converter via Permutation Entropy". Energies 11, n. 10 (13 ottobre 2018): 2747. http://dx.doi.org/10.3390/en11102747.
Abstract (sommario):
Quantifying nonlinear dynamic behaviors, such as bifurcation and chaos, in nonlinear systems are currently being investigated. In this paper, permutation entropy is used to characterize these complex phenomena in nonlinear direct current-direct current (DC-DC) converter systems. A mode switching time sequence (MSTS), containing the information from different periodic states, is obtained in a DC-DC converter by reading the inductor current when altering the switching mode. To obtain the nonlinear characteristics of this system, the concept of permutation entropy of symbolic probability distribution properties is introduced and the structure of the chaotic system is reproduced based on the theory of phase space reconstruction. A variety of nonlinear dynamic features of the DC-DC converter are analyzed using the MSTS and permutation entropy. Finally, a current-mode-controlled buck converter is reviewed as a case to study the quantification of nonlinear phenomena using permutation entropy as one of the system parameters changes.
38
Jang, Hyun Gyu, Dong Yun Jung, Yong Ha Lee, Doohyung Cho, Kun Sik Park, Jong-Won Lim, Wonkyo Kim, Joomin Park e Ick-Jae Yoon. "LTCC-Based DC-DC Converter for Reduction of Switching Noise and Radiated Emissions". Journal of Electromagnetic Engineering and Science 23, n. 3 (31 maggio 2023): 251–58. http://dx.doi.org/10.26866/jees.2023.3.r.165.
Abstract (sommario):
In this study, a low-temperature co-fired ceramic (LTCC)-based direct current (DC)-DC converter is proposed for reducing stray inductance and mitigating electromagnetic interference. The dominant radiating loop of the proposed LTCC-based DC-DC converter features a multilayer design, which helps suppress noise sources and reduce radiated emissions. The peak voltage of switching noise for the proposed DC-DC converter at the frequency of 500 kHz is approximately 8.98% lower than that of a conventional DC-DC converter. In addition, the radiated emission level of the proposed DC-DC converter is lower than that of the conventional DC-DC converter. In sum, the proposed LTCC-technology-based multilayer design reduces the peak voltage of switching noise and the radiated emission of the DC-DC converter.
39
Tatar, Karol, Piotr Chudzik e Piotr Leśniewski. "Sliding Mode Control of Buck DC–DC Converter with LC Input Filter". Energies 16, n. 19 (7 ottobre 2023): 6983. http://dx.doi.org/10.3390/en16196983.
Abstract (sommario):
The employment of input filters in modern DC–DC converters is mandatory in order to ensure EMC (Electro-Magnetic Compatibility), provide power electronics with decent voltage and minimize the converter influence on the power grid. The LC type input filters bring also a possibility of voltage and current oscillation that may occur in the system. This oscillation may rise to a certain level that affects system stability. A wide range of methods are employed in order to attenuate these oscillations and allow appropriate system transient response. In this paper, the sliding mode control (SMC) strategy is proposed to reduce the input LC filter voltage and current oscillation and allow DC (Direct Current) output voltage control for both resistive and constant power load. The proposed control algorithm is intended for use in railway, tram and trolleybus DC/DC converters. For the proposed scheme of control simulation, a model is developed using Simulink software. Furthermore, laboratory stand experiments are carried out to verify simulation results.
40
Wang, Meiyan, Ke-Jun Li, Kaiqi Sun e Zhijie Liu. "Operation Scenario and Coordination Control of DC Grid with DC-DC Converters". Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 13, n. 3 (18 maggio 2020): 369–77. http://dx.doi.org/10.2174/2352096512666181129115540.
Abstract (sommario):
Background: With the increasing development of voltage source converter based high voltage direct current (HVDC), it will become a reality to interconnect different DC networks into DC grid with DC-DC converters. Methods: In this paper, three operation scenarios for the DC grid with DC-DC converters are proposed, by which the DC networks can reinforce each other with relative independence. In order to achieve the flexible switching of the proposed scenarios, the DC-DC combined control and principle of parameter selection are presented. In addition, two coordination controls for different scenarios are given to optimize the distribution of unbalanced power when the disturbances occur in the grid. With the proposed scenarios and control strategy, the impacts caused by the disturbances are alleviated and the uninterrupted operation of the grid is guaranteed. Results: A simulation model is established on the PSCAD/EMTDC and the simulation results verify the effectiveness of the proposed operation scenarios and control strategy. Conclusion: Finally, the effectiveness of the proposed operation scenarios and control strategy is verified by the simulation results in PSCAD/EMTDC.
41
Themozhi, G., K. Srinivasan, T. Arun Srinivas e A. Prabha. "Analysis of suitable converter for the implementation of drive system in solar photovoltaic panels". Electrical Engineering & Electromechanics, n. 1 (1 gennaio 2024): 17–22. http://dx.doi.org/10.20998/2074-272x.2024.1.03.
Abstract (sommario):
Introduction. Photovoltaic (PV) systems gained immense attraction in the recent years since it produces electricity without causing environmental pollution through direct conversion of solar irradiance into electricity. Solar PV panels produce DC power. The magnitude of this DC power varies with temperature and irradiance of the sun rays. The DC supply from solar panels can be regulated using DC-DC converter and then can further be converted into the desired AC voltage by means of a voltage source inverter before being fed to an induction motor (IM). The speed and torque of an IM, fed from PV arrays, can vary due to the variation in the output power of the panels. Goal of this work is to improve the dynamic performance and reduce the torque ripple of Cuk converter-inverter fed IM drive system. The novelty of the current work proposes interleaved Cuk converter between solar PV DC source and the inverter. Purpose. To provide continuous current using an interleaved Cuk converter to the IM drive and in turn to reduce the torque ripple in IM. Methodology. Introduced an interleaved Cuk converter which is a blend of Cuk converters connected in parallel with each other between solar PV arrays and IM drive system. Originality. Simulation results are obtained for Cuk converter and interleaved Cuk converter fed IM drive by means of MATLAB. The hardware setup for the same IM systems is developed. Practical value. Simulation and hardware results are coincided with each other and it is subject from the simulation and hardware results that the interleaved Cuk converter-inverter fed IM system produced results superior than the Cuk converter inverter fed IM drive system.
42
Moreno-Valenzuela, Javier, e Octavio García-Alarcón. "On Control of a Boost DC-DC Power Converter under Constrained Input". Complexity 2017 (2017): 1–11. http://dx.doi.org/10.1155/2017/4143901.
Abstract (sommario):
In this paper, a new controller for a boost DC-DC (direct current to direct current) power converter is proposed. The discussed DC-DC boost converter model considers the losses coming from the inductor and capacitor. The novel control scheme takes into account that the duty cycle is constrained to physically admissible values. The analysis of the closed-loop trajectories provides the conclusion that output voltage regulation is achieved in asymptotic form. In addition, the problem of uncertain supply voltage and unmeasurable inductor current is also addressed by using an observer together with the proposed control law. Our theoretical results are supported by using numerical simulations and experimental tests. Comparisons with respect to known approaches are presented.
43
Shneen, Salam Waley, Ahlam Luaibi Shuraiji e Kassim Rasheed Hameed. "Simulation model of proportional integral controller-PWM DC-DC power converter for DC motor using MATLAB". Indonesian Journal of Electrical Engineering and Computer Science 29, n. 2 (1 febbraio 2023): 725. http://dx.doi.org/10.11591/ijeecs.v29.i2.pp725-734.
Abstract (sommario):
Smoothly speed range changing, easily speed controlling, and swiftly dynamic response for load torque changing are the main merits which are delivered by direct current (DC) motors. They are also distinguished by their versatility. All these characteristics make the DC motors suitable candidates for various applications. An accurate high-speed control with a good dynamic response, would be of demand for many applications of the DC motors. Controlling the speed of motors using conventional systems is one of the most important method that is adopted and it can be more efficient when used with electronic power devices to control the output voltage. Hence, this paper introduces an efficient proportional integral (PI) speed controller for DC motor fed by direct current-direct current (DC-DC) convertor, which is switched by pulse-width modulation technique. MATLAB/Simulink environment is used to build the whole system. Two operation scenarios have been conducted including constant load with variable speed and variable load with constant speed.
44
Shahin, Rasha Ghilman, e Hussein Diab Al-Majali. "Performance analysis of multi-level high voltage direct current converter". International Journal of Electrical and Computer Engineering (IJECE) 12, n. 2 (1 aprile 2022): 1368. http://dx.doi.org/10.11591/ijece.v12i2.pp1368-1376.
Abstract (sommario):
<p class="Abstract">The conventional three-phase alternating current (AC) to direct current (DC) converter can be modified using two isolated-gate bipolar transistor (IGBT) as by-pass switches connected to tapping points on the secondary side of the transformer. This scheme yields a reduction in both harmonic contents and reactive volt-ampere absorption. This modified converter possibly eliminates the need for an on-load tap-changer on the converter transformer. The modified AC/DC converter is fully analyzed and implemented under balanced conditions using MATLAB-Simulink. The expressions of the output DC voltage are derived for different cases. The supply current harmonic contents, the reactive power absorption and the power factor have been compared for three schemes; the conventional bridge, the modified bridge using one by-pass IGBT valve and the modified bridge with two by-pass IGBT valves. </p>
45
Xu, Liang, Dong Qing Miao e Jing Qiu Zhang. "Design of Magnetic Integrated LLC Transformer". Scientific and Social Research 5, n. 6 (28 giugno 2023): 30–38. http://dx.doi.org/10.26689/ssr.v5i6.5079.
Abstract (sommario):
The direct current/direct current (DC/DC) converter of the LLC (inductor-inductor-capacitor) converter is an important part of affecting the work efficiency, volume, and weight of the device. It not only has the functions of traditional transformers but is also able to solve the problems of traditional power transformers’ high price, huge volume, prodigious no-load loss, and inflexible control. This paper studies the DC/DC converter mainly, according to the given indexes, the magnetic integrated LLC resonant transformer is designed in detail. The magnetic integrated transformer greatly reduces the converter volume, and the selection of devices is completed based on parameters design. In addition, according to design parameters, losses and the efficiency of the LLC resonant transformer are calculated. The results meet the efficiency requirements. A test platform of a full-bridge LLC resonant converter is built according to theoretical research. The correctness and effectiveness of theoretical research and design methods of the DC/DC converter are verified by analyzing the experimental waveforms.
46
Pesce, Cristián, Javier Riedemann, Rubén Peña, Iván Andrade, Werner Jara e Rodrigo Villalobos. "Decoupled Control for Double-T Dc-Dc MMC Topology for MT-HVdc/MVdc Grids". Applied Sciences 13, n. 6 (16 marzo 2023): 3778. http://dx.doi.org/10.3390/app13063778.
Abstract (sommario):
This paper proposes a decoupled control of a dc-dc modular multilevel converter (MMC) based on a double-T topology intended for multi-terminal high voltage direct current (MT-HVdc) transmission systems or emerging distribution systems operating in medium voltage direct current (MVdc). The aim of the proposed control strategy is to obtain an input current with reduced harmonic content and to eliminate the output ac common-mode voltage, which is not allowed in MT-HVdc systems. The control strategy consists of injecting two circulating ac currents and two dc currents that allow the energy balance between the arms of the converter and the general energy balance of the topology. The dc and ac currents are decoupled and allow control over load variations and reference changes in the dc-links. The proposed topology is mathematically modeled and the control method is then derived. Simulation results are presented to validate the proposed system.
47
Okilly, Ahmed H., Namhun Kim e Jeihoon Baek. "Inrush Current Control of High Power Density DC–DC Converter". Energies 13, n. 17 (19 agosto 2020): 4301. http://dx.doi.org/10.3390/en13174301.
Abstract (sommario):
This paper presents a complete mathematical design of the main components of 2 kW, 54 direct current (DC)–DC converter stage, which can be used as the second stage of the two stages of alternating current (AC)–DC telecom power supply. In this paper, a simple inrush current controlling circuit to eliminate the high inrush current, which is generated due to high input capacitor at the input side of the DC–DC converter, is proposed, designed, and briefly discussed. The proposed circuit is very easy to implement in the lab using a single metal–oxide–semiconductor field-effect transistor (MOSFET) switch and some small passive elements. PSIM simulation has been used to test the power supply performance using the value of the designed components. Furthermore, the experimental setup of the designed power supply with inrush current control is built in the lab to show the practical performance of the designed power supply and to test the reliability of the proposed inrush current mitigation circuit to eliminate the high inrush current at initial power application to the power supply circuit. DC–DC power supply with phase shift zero voltage switching (ZVS) technique is chosen and designed due to its availability to achieve ZVS over the full load range at the primary side of the power supply, which reduces switching losses and offers high conversion efficiency. High power density DC–DC converter stage with smooth current startup operation, full load efficiency over 95%, and better voltage regulation is achieved in this work.
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Szcześniak, Paweł. "Comparison of control methods for a dynamic voltage restorer using a three-phase matrix converter". SIMULATION 92, n. 12 (14 ottobre 2016): 1053–63. http://dx.doi.org/10.1177/0037549716673203.
Abstract (sommario):
A dynamic voltage restorer (DVR) is used in a power distribution system to protect sensitive loads against voltage disturbances. The commonly used DVR system contains a converter with direct current (DC) link and energy storage elements. The DC energy storage part of the system is the most expensive element and has a large value. As an alternative, therefore, DVR systems can use alternating current AC/AC converters without DC energy storage. This paper presents the properties of a DVR system based on a direct matrix converter using three control methods: in-phase, pre-sag, and energy-optimal. The paper defines basic mathematical relationships and static characteristics and describes the range of voltage compensation by use of the described compensation methods. Simulation results are obtained and presented in order to verify the correctness of the compensation. The features of such a DVR system configuration are considered in the context of alternative applications for commonly used converters with DC-link energy storage power converters. Application of the matrix converter in electrical power systems is still not very popular, due to limited output voltage and the complex structure and process control. This article is an attempt to show the usefulness of the matrix converter in spite of its limitations and the complexity of the design.
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Akca, Hakan, e Ahmet Aktas. "Examination and experimental comparison of dc/dc buck converter topologies used in wireless electric vehicle charging applications". An International Journal of Optimization and Control: Theories & Applications (IJOCTA) 14, n. 2 (29 febbraio 2024): 81–89. http://dx.doi.org/10.11121/ijocta.1503.
Abstract (sommario):
The studies on Wireless Power Transfer (WPT) technology and peripherals in Electric Vehicle (EV) applications are intensifying. While the energy received from the WPT system is transferred to the EV battery, the direct current (dc)/dc converter circuits are used. The dc/dc buck converter topologies are one of them. The converter circuits must be highly efficient, lightweight, and compact to have a high range in EV vehicles. There are asynchronous buck, synchronous buck, and interleaved synchronous buck converter circuit topologies from the literature. In this study, the efficiency results of these circuit topologies were analyzed using MATLAB/Simulink and experimental studies. This study contributes to the literature by conducting circuit-level efficiency analysis and component-level power loss analysis. It has been observed that the interleaved synchronous buck converter circuit operates at 99% efficiency at 1066 W. In addition, it has been shared with the oscilloscope results that the current ripples of this circuit topology are lower than other circuit converters. Specifically, there has been a significant reduction of 56% in power losses, particularly in the interleaved synchronous buck converter (ISBC). This study analyzes the dynamic behavior of the dc/dc buck converter topologies, and results about their performance are given.
50
Huo, Zhi Cheng, Guang Xu Ren, Jia Ying Gao e Guo Bao Ding. "Design of Inverter Based on the Soft-Switched of High Frequency Pulse DC Loop". Advanced Materials Research 834-836 (ottobre 2013): 1114–17. http://dx.doi.org/10.4028/www.scientific.net/amr.834-836.1114.
Abstract (sommario):
Design a DC/AC converter based on simplex single voltage source high frequency pulse DC loop technology, the output is 115V400Hz, 0.9KVA and the input is three phase alternating current. The forward part is DC/DC converter which provides pulse D.C. to the back part DC/AC converter. Implement soft-switch by changing the on-off state of switching tubes on the inversion arm path at the zero-voltage instant of the pulse direct current, no need of the auxiliary resonant net. The system takes three-state DPM current hysteresis control mode, gets good performance on output wave and efficiency.