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Journal articles on the topic 'Active and reactive power responses'

Author: Grafiati

Published: 11 December 2022

Last updated: 31 July 2025

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1

Mehrasa, Majid, Edris Pouresmaeil, Hamid Soltani, Frede Blaabjerg, Maria Calado, and João Catalão. "Virtual Inertia and Mechanical Power-Based Control Strategy to Provide Stable Grid Operation under High Renewables Penetration." Applied Sciences 9, no. 6 (2019): 1043. http://dx.doi.org/10.3390/app9061043.

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This paper presents a virtual inertia and mechanical power-based control strategy to provide a stable operation of the power grid under high penetration of renewable energy sources (RESs). The proposed control technique is based on a new active and reactive power-based dynamic model with the permanent magnet synchronous generator (PMSG) swing equation, in which all PMSG features i.e., inertia and mechanical power are embedded within the controller as the main contribution of this paper. To present an accurate analysis of the virtual PMSG-based parameters, the desired zero dynamics of the grid

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2

Maziar, Izadbakhsh, and Gandomkar Majid. "Dynamic Responses Improvement of Grid Connected WPGS Using FLC in High Wind Speeds." Dynamic Responses Improvement of Grid Connected WPGS Using FLC in High Wind Speeds 3, no. 4 (2014): 33 to 49. https://doi.org/10.5281/zenodo.3777555.

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Environmental and sustainability concerns are developing the significance of distributed generation (DG) based on renewable energy sources. In this paper, dynamic responses investigation of grid connected wind turbine using permanent magnet synchronous generator (PMSG) under variable wind speeds and load circumstances is carried out. In order to control of turbine output power using Fuzzy Logic controller (FLC) in comparison with PI controller is proposed. Furthermore, the pitch angle based on FLC using wind speed and active power as inputs, can have faster responses, thereby leading to smooth

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3

Wang, Ying, Youbin Zhou, Dahu Li, et al. "The Influence of VSC–HVDC Reactive Power Control Mode on AC Power System Stability." Energies 13, no. 7 (2020): 1677. http://dx.doi.org/10.3390/en13071677.

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Voltage source converter-based high-voltage direct current (VSC-HVDC) has the advantage of fast and independent controllability on active and reactive power. This paper focuses on effects of commonly proposed reactive power control modes, constant reactive power control and AC voltage margin control. Based on the mathematical model of single machine infinity equivalent system with embedded VSC-HVDC, the influence of VSC-HVDC with different reactive power control strategies on transient stability and dynamic stability of the AC system is studied. Then case studies were conducted with a realisti

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4

Sharma, Aditya, and D. K. Palwalia. "Small Signal Modelling and Stability Analysis of a Grid Connected Inverted Based Microgrid." Indian Journal Of Science And Technology 17, no. 19 (2024): 2024–37. http://dx.doi.org/10.17485/ijst/v17i19.379.

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Objectives: This work focuses on the stability analysis of grid connected microgrids. It considers the impact of load disturbance and grid voltage change on voltage and current levels, as well as reactive and active power responses, is analysed. Methods: A comprehensive small-signal state-space model is developed for an inverter-based microgrid, incorporating submodules of inverters, phase-locked loops (PLLs), and LCL filters. The model is linearized around a stable operating point, and eigenvalue analysis is performed and validated through MATLAB/Simulink simulations. A current controller ope

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Aditya, Sharma, and K. Palwalia D. "Small Signal Modelling and Stability Analysis of a Grid Connected Inverted Based Microgrid." Indian Journal of Science and Technology 17, no. 19 (2024): 2024–37. https://doi.org/10.17485/IJST/v17i19.379.

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Abstract <strong>Objectives:</strong> This work focuses on the stability analysis of grid connected microgrids. It considers the impact of load disturbance and grid voltage change on voltage and current levels, as well as reactive and active power responses, is analysed. <strong>Methods:</strong> A comprehensive small-signal state-space model is developed for an inverter-based microgrid, incorporating submodules of inverters, phase-locked loops (PLLs), and LCL filters. The model is linearized around a stable operating point, and eigenvalue analysis is performed and validated thr

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Reguig Berra, Ahmed, Said Barkat, and Mansour Bouzidi. "Virtual Flux Predictive Direct Power Control of Five-level T-type Multi-terminal VSC-HVDC System." Periodica Polytechnica Electrical Engineering and Computer Science 64, no. 2 (2020): 133–43. http://dx.doi.org/10.3311/ppee.14441.

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This paper proposes a Virtual Flux Predictive Direct Power Control (PDPC) for a five-level T-type multi-terminal Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission system. The proposed PDPC scheme is based on the computation of the average voltage vector using a virtual flux predictive control algorithm, which allows the cancellation of active and reactive power tracking errors at each sampling period. The active and reactive power can be estimated based on the virtual flux vector that makes AC line voltage sensors not necessary. A constant converter switching frequen

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7

Muhamad Zahim Sujod, Muhammad Muttaqin A. Rahim, Nor Azwan Mohamed Kamari, Ahmad Nazri Dagang, and Ali Qasem Al-Shetwi. "Performance Analysis of Photovoltaic and Wind Turbine Grid-Connected Systems under LVRT Conditions." Journal of Advanced Research in Fluid Mechanics and Thermal Sciences 115, no. 1 (2024): 143–55. http://dx.doi.org/10.37934/arfmts.115.1.143155.

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The integration of grid-connected renewable energy systems has gained significant attention and introduces several challenges and considerations. One of these challenges is ensuring the reliable and stable operation of these systems under various grid conditions. For example, faults at the grid could lead problems such as DC-link over-voltage and AC over-current that may cause disconnection or damage to inverter. This paper presents a comprehensive analysis of the performance of photovoltaic (PV) and doubly-fed induction generator (DFIG) wind turbine grid-connected systems under low voltage ri

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Ekström, Rickard, and Mats Leijon. "FPGA Control Implementation of a Grid-Connected Current-Controlled Voltage-Source Inverter." Journal of Control Science and Engineering 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/713293.

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The full control system of a grid-connected current-controlled voltage-source inverter (CC-VSI) has been designed and implemented on a field-programmable gate array (FPGA). Various control functions and implementation methods are described and discussed. The practical viability of the system is evaluated in an experimental setup, where a VSI supplies 30 kW into the local grid at 400 V. A phase-locked loop (PLL) is used for grid phase tracking and evaluated for simulated abnormal grid conditions. Power factor is kept at unity, and the implemented control system is stressed with step responses i

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9

Elyaalaoui, Kamal, Moussa Labbadi, Mohammed Ouassaid, and Mohamed Cherkaoui. "Optimal Fractional Order Based on Fuzzy Control Scheme for Wind Farm Voltage Control with Reactive Power Compensation." Mathematical Problems in Engineering 2021 (March 2, 2021): 1–12. http://dx.doi.org/10.1155/2021/5559242.

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Voltage stability margin is ensured through the reactive power resources. In order to generate the reactive power references and ensure the low-voltage ride-through (LVRT) control of a wind farm system based on squirrel cage induction generator, this paper proposed an optimal control approach based on fractional-order (FO) PI-fuzzy-PI (FOPI-fuzzy-FOPI) controller. The proposed control method ensures, also, the demand for active and reactive power predetermined by the transmission system operator (TSO) and satisfies the grid code recommendations. In order to achieve a faster tracking of state v

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10

Li, Shun, Xing Yao, Cong Fu, Meng Zhan, and Bo Bao. "The Impact of Terminal-Voltage Control on the Equilibrium Points and Small-Signal Stability of GFL-VSC Systems." Energies 18, no. 12 (2025): 3023. https://doi.org/10.3390/en18123023.

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Weak grid stability is crucial for grid-following voltage source converter (GFL-VSC) systems. Current studies primarily focus on the interaction analyses between active-power loops, whereas the influence of reactive-power loops remains unclear. To address this problem, this study focuses on terminal-voltage control (TVC) and analyzes its impact on equilibrium points (EPs) and small-signal stability by varying the TVC response speed, including three different cases: considering TVC dynamics, considering TVC rapid responses, and considering TVC slow responses. Firstly, the models of the GFL-VSC

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11

Samaranayake, Lilantha, Carlos E. Ugalde-Loo, Oluwole D. Adeuyi, John Licari, and Janaka B. Ekanayake. "Multi-Terminal DC Grid with Wind Power Injection." Wind 2, no. 1 (2022): 17–36. http://dx.doi.org/10.3390/wind2010002.

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With the development of offshore wind generation, the interest in cross-country connections is also increasing, which requires models to study their complex static and dynamic behaviors. This paper presents the mathematical modeling of an offshore wind farm integrated into a cross-country HVDC network forming a multi-terminal high-voltage DC (MTDC) network. The voltage source converter models were added with the control of active power, reactive power, frequency, and DC link voltages at appropriate nodes in the MTDC, resembling a typical cross-country multi-terminal type of HVDC scenario. The

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Matharani, Kinnari, and Hitesh Jariwala. "Design of Fuzzy Logic based Adaptive Active Power Controller to Enhance Power sharing among DGs in an Autonomous Microgrid." Jurnal Kejuruteraan 36, no. 1 (2024): 273–85. http://dx.doi.org/10.17576/jkukm-2024-36(1)-25.

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This paper presents the design of an adaptive active power controller to enhance the power-sharing capabilities of distributed generators (DGs) in an autonomous microgrid. Each DG in an autonomous microgrid consists of a droop-controlled inverter to control active and reactive power by regulating frequency and voltage correspondingly. The high droop gain can be used in the power controller to encourage faster power sharing among the DGs. However, high droop gain can cause undamped growing oscillations during load fluctuations or generation losses. During such events, attaining faster power-sha

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LARIN, Vasily S., and Daniil A. MATVEEV. "Determination of Damping Factors Based on the Measured Frequency Responses of Power Transformer Windings. Part 2. Analysis of Measurement Results." Elektrichestvo 2, no. 2 (2021): 22–28. http://dx.doi.org/10.24160/0013-5380-2021-2-22-28.

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In the first part of the article, based on the results of theoretical studies performed for a simplified transformer winding equivalent scheme, it was shown that the damping factors can be estimated from the width of the resonant peaks of the frequency responses of the module and the reactive component of the voltage at the midpoint of the equivalent scheme, as well as the active component of the input admittance and neutral current of the considered resonant scheme. In this part of the article, the practical possibility of applying the obtained theoretical relations between the damping factor

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14

Baier, Carlos R., Pedro E. Melin, Miguel A. Torres, Roberto O. Ramirez, Carlos Muñoz, and Agustin Quinteros. "Developing and Evaluating the Operating Region of a Grid-Connected Current Source Inverter from Its Mathematical Model." Mathematics 12, no. 12 (2024): 1775. http://dx.doi.org/10.3390/math12121775.

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Grid-connected power inverters are indispensable in modern electrical systems, playing a pivotal role in enhancing the integration of renewable energies into power grids. Their significance, primarily when functioning as grid-forming inverters, extends to maintaining the grid’s inertia and strength—a distinct advancement over traditional grid-following operations. As grid-forming inverters, these devices emulate the characteristics of synchronous generators and can act as robust voltage sources, providing essential ancillary services. This behavior is particularly relevant when integrating ene

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15

Zhang, Guang Ru, Dong Sheng Yang, Ting Liu, Jun Yan Zeng, and Yu Kun Xu. "Grid-Connected of Photovoltaic Module Using Inverse Optimal Control." Advanced Materials Research 765-767 (September 2013): 1834–39. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.1834.

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Switching converters and photovoltaic panels are nonlinear models, but existing PV inverter control methods are mostly based on the linearization control methods. The traditional linear methods are often difficult to eliminate static errors and the dynamic responses are not very satisfactory. In this paper, on the basis of nonlinear methods to control the switching converter, a mathematical model of discrete rotating coordinate system is given and an inverse optimal control method for single-phase grid-connected inverter control is proposed at the same time. This method achieved independent po

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16

Sun, Shumin, Yuejiao Wang, Zhijie Zheng, et al. "Modular Modeling of Electromechanical Transients for Grid-Forming Energy Storage Systems." Journal of Physics: Conference Series 3012, no. 1 (2025): 012074. https://doi.org/10.1088/1742-6596/3012/1/012074.

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Abstract As power systems increasingly incorporate renewable energy sources and power electronic converters, the overall system inertia declines, making grid-forming energy storage systems essential for enhancing system stability and flexibility. This paper presents a modular electromechanical transient modelling approach for grid-forming energy storage systems. The proposed model comprises initial value calculation, power loop, injected current calculation, current limit compensation, and active/reactive auxiliary control modules, enabling precise simulation of the electromechanical transient

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17

Hossen, Md Delwar, Md Fokhrul Islam, Md Fatin Ishraque, Sk A. Shezan, and S. M. Arifuzzaman. "Design and Implementation of a Hybrid Solar-Wind-Biomass Renewable Energy System considering Meteorological Conditions with the Power System Performances." International Journal of Photoenergy 2022 (August 2, 2022): 1–17. http://dx.doi.org/10.1155/2022/8792732.

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This paper presents a performance evaluation of an off-grid PV-wind-biomass hybrid energy system for a remote area named Kuakata in Bangladesh considering dispatch strategy-based control, power system response, and reliability analysis-based stability and feasibility study. The simulation and optimization of operations of the system have been done by the HOMER software using the real-time field data of solar radiation, wind speed, and biomass of that particular area for ensuring economical and environmental feasibility offering the least net present cost (NPC), cost of energy (COE), and CO2 em

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Bin Mohamad Saifuddin, Muhammad Ramadan, Thaiyal Naayagi Ramasamy, and Wesley Poh Qi Tong. "Design and Control of a DC Collection System for Modular-Based Direct Electromechanical Drive Turbines in High Voltage Direct Current Transmission." Electronics 9, no. 3 (2020): 493. http://dx.doi.org/10.3390/electronics9030493.

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In response to an increasing demand for offshore turbine-based technology installations, this paper proposes to design a DC collection system for multi-connected direct drive turbines. Using tidal stream farm as the testbed model, inverter design and turbine control features were modelled in compliance with high voltage ride-through capabilities that operate in isochronous mode suggested by IEEE1547-2018. The aim of the paper is twofold. Firstly, operation analyses in engaging a single-stage impedance source inverter as an AC-link busbar aggregator to pilot a parallel-connected electromechanic

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Villena-Ruiz, Raquel, Alberto Lorenzo-Bonache, Andrés Honrubia-Escribano, Francisco Jiménez-Buendía, and Emilio Gómez-Lázaro. "Implementation of IEC 61400-27-1 Type 3 Model: Performance Analysis under Different Modeling Approaches." Energies 12, no. 14 (2019): 2690. http://dx.doi.org/10.3390/en12142690.

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Forecasts for 2023 position wind energy as the third-largest renewable energy source in the world. This rapid growth brings with it the need to conduct transient stability studies to plan network operation activities and analyze the integration of wind power into the grid, where generic wind turbine models have emerged as the optimal solution. In this study, the generic Type 3 wind turbine model developed by Standard IEC 61400-27-1 was submitted to two voltage dips and implemented in two simulation tools: MATLAB/Simulink and DIgSILENT-PowerFactory. Since the Standard states that the responses

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M, Nandhini, Ruban Jayaraj A, Lavanya R, et al. "A review: the therapeutic power of natural extracts in wound recovery." Future Journal of Pharmaceuticals and Health Sciences 4, no. 4 (2024): 94–101. https://doi.org/10.26452/fjphs.v4i4.686.

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Natural extracts from plants, herbs, and other biological sources have demonstrated substantial potential in wound healing through their diverse biochemical activities, primarily attributed to active compounds such as alkaloids, flavonoids, phenols, and terpenoids. These compounds facilitate wound healing across various stages, including hemostasis, inflammation, proliferation, and remodeling, by modulating cellular responses, promoting tissue regeneration, and minimizing scar formation. During the hemostasis phase, natural extracts enhance platelet aggregation and fibrin formation, creating a

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M, Nandhini. "A review: the therapeutic power of natural extracts in wound recovery." A review: the therapeutic power of natural extracts in wound recovery 4, no. 4 (2024): 94–101. https://doi.org/10.26452/fjphs.v4i4.686.

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Natural extracts from plants, herbs, and other biological sources have demonstrated substantial potential in wound healing through their diverse biochemical activities, primarily attributed to active compounds such as alkaloids, flavonoids, phenols, and terpenoids. These compounds facilitate wound healing across various stages, including hemostasis, inflammation, proliferation, and remodeling, by modulating cellular responses, promoting tissue regeneration, and minimizing scar formation. During the hemostasis phase, natural extracts enhance platelet aggregation and fibrin formation, creating a

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P, Olaogun. "Application of Static Synchronous Compensator for Improvement of Power System Transient Stability." Arid-zone Journal of Basic and Applied Research 4, no. 1 (2024): 65–87. http://dx.doi.org/10.55639/607.454443.

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Transient stability is the power system’s ability to maintain synchronism when exposed to severe disturbances such as loss of generation, rapid load changes, transmission lines tripping, switching operations and faults. Transient instability causes cascading outages, system collapse and economical losses. This study employed static synchronous compensator (STATCOM) for power system transient stability improvement. The system’s steady state and transient responses were respectively modelled with Newton-Raphson power flow and modified-Euler linearized swing equations. A balanced three-phased sho

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Kim, Ki Ryong, Sangjung Lee, Jong-Pil Lee, and Jaesik Kang. "An Enhanced Control Strategy for Mitigation of State-Transition Oscillation Phenomena in Grid-Forming Self-Synchronized Converter System with Islanded Power System." Energies 14, no. 24 (2021): 8453. http://dx.doi.org/10.3390/en14248453.

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This paper proposes an enhanced control strategy for mitigating state-transition oscillations in active and reactive power responses of self-synchronized converter system to secure the islanded power system stability. The self-synchronized converter is well known for “grid-forming” that is able to operate to stand-alone mode (SAM) providing grid voltage and frequency without phase synchronization units. Although the grid-forming (GFM) is self-synchronized, the inherent synchronization principle causes system degradation in which should maintain a point of common coupling (PCC) voltage for crit

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Akanto, Jannatul Mawa, Md Kamrul Islam, Effat Jahan, Md Rifat Hazari, Mohammad Abdul Mannan, and Md Abdur Rahman. "Dynamic analysis of grid-connected hybrid wind farm." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 2 (2023): 1230. http://dx.doi.org/10.11591/ijpeds.v14.i2.pp1230-1237.

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Since the last couple of years, the expansion of grid-connected wind farms (WFs) has increased dramatically. The wind turbine might be a fixed-speed squirrel cage induction generator (FSWT-SCIG) or a variable speed wind turbine with a doubly-fed induction generator (VSWT-DFIG). The main disadvantage of FSWT-SCIG is its lack of ability to adjust power quality. Inversely, the VSWT-DFIG is a competitive wind turbine technology that allows for the effective management of both active and reactive power outputs. Moreover, it has some extraordinary functionaries rather than FSWTSCIG. However, the maj

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Jannatul, Mawa Akanto, Kamrul Islam Md., Jahan Effat, Rifat Hazari Md., Abdul Mannan Mohammad, and Abdur Rahman Md. "Dynamic analysis of grid-connected hybrid wind farm." International Journal of Power Electronics and Drive Systems 14, no. 02 (2023): 1230~1237. https://doi.org/10.11591/ijpeds.v14.i2.pp1230-1237.

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Since the last couple of years, the expansion of grid-connected wind farms (WFs) has increased dramatically. The wind turbine might be a fixed-speed squirrel cage induction generator (FSWT-SCIG) or a variable speed wind turbine with a doubly-fed induction generator (VSWT-DFIG). The main disadvantage of FSWT-SCIG is its lack of ability to adjust power quality. Inversely, the VSWT-DFIG is a competitive wind turbine technology that allows for the effective management of both active and reactive power outputs. Moreover, it has some extraordinary functionaries rather than FSWT-SCIG. However, the ma

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26

Fazliana Fadzail, Noor, Samila Mat Zali, Arizadayana Zahalan, and Mohd Alif Ismail. "Parameter Estimation for Dynamic Model of Distribution Network Cell (DNC) Using Fuzzy System." Applied Mechanics and Materials 793 (September 2015): 489–93. http://dx.doi.org/10.4028/www.scientific.net/amm.793.489.

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The aim of this project is to develop parameter estimation for dynamic model of distribution network cell (DNC) using fuzzy system. The parameter value was updated through adaptive neuro-fuzzy inference system (ANFIS). The active and reactive power responses from the fuzzy model were compared with the response from the full DNC model at various types of disturbances. The response of full DNC model was obtained from the UK 11 kV distribution network model. The model was built in DigSILENT PowerFactory software. The results obtained shown that the fuzzy model was more simple as only a few parame

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Memon, Ahsanullah, Mohd Wazir Mustafa, Shadi Khan Baloch, Attaullah Khidrani, and Touqeer Ahmed. "Dynamic response enhancement of BDFIG using vector control scheme based internal model control." Indonesian Journal of Electrical Engineering and Computer Science 23, no. 1 (2021): 90–97. https://doi.org/10.11591/ijeecs.v23.i1.pp90-97.

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Double fed induction generator (DFIG) has shown tremendous success in wind turbines due to its flexibility and ability to regulate the active and reactive power. However, the presence of brushes and slip rings affects its reliability, stability, and power quality. Furthermore, it does not provide promising outcomes in case of faults even in presence of the crowbar circuit. In contrast, the brushless doubly fed induction generator (BDFIG) is a more reliable option for wind turbines than its mentioned counterpart due to the absence of the brushes and slip rings. This research work as such attemp

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Mayakrishnan, Vijayakumar, Dae-Hee Lee, Kee-Hong Kim, and Choon Young Kim. "Role of Corn Peptide Powder in Lipopolysaccharide-Induced Inflammatory Responses in 3T3-L1 Adipocytes." Nutrients 16, no. 12 (2024): 1924. http://dx.doi.org/10.3390/nu16121924.

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Corn peptide (CP) is a short, naturally occurring, and physiologically active peptide generated from corn-protease-catalyzed hydrolysis. CP plays a role in preventing obesity-related disorders, but its impact on reducing inflammation is unknown. Hence, this study examined the possible protective effects of corn peptide powder (CPP) against the harmful effects of lipopolysaccharide (LPS), with a particular emphasis on reducing oxidative damage and inflammation in adipocytes. Hence, mature 3T3-L1 adipocytes underwent exposure to 10 ng/mL LPS, with or without CPP (10 and 20 μg/mL). LPS stimulatio

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Komijani, Hossein. "ANFIS Controller Design of DFIG under Distorted Grid Voltage Situations." Recent Advances in Electrical & Electronic Engineering (Formerly Recent Patents on Electrical & Electronic Engineering) 12, no. 5 (2019): 445–52. http://dx.doi.org/10.2174/2352096511666180719095657.

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Background: Modeling and controlling of Doubly Fed Induction Generator (DFIG) are presented in this paper. The DFIG is considered in the positive synchronous reference framework under Distorted Grid Voltage Situations (DGVS). The DFIG electromagnetic torque, active and reactive powers of the instantaneous stator are discussed under the condition of harmonically DGVS. Methods: Four alternative control strategies are implemented on DFIG system to enhance the responses under DGVS. A novel rotor current controller based on adaptive neuro-fuzzy interface system (ANFIS) is developed. The main, fifth

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Djebbri, Sihem, та Samir Ladaci. "Modeling and Power Control of Cascaded Doubly-Fed Induction Generators Using a fractional-order PIλ controller". Algerian Journal of Signals and Systems 10, № 2 (2025): 75–81. https://doi.org/10.51485/ajss.v10i2.239.

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This paper deals with the power control of the cascaded doubly-fed induction generator (CDFIG) for wind energy applications. using a fractional order proportional integral (FOPI) controller within a field oriented control (FOC) scheme. The FOPI controller has a similar structure to the classic proportional-integral (PI) controller but FOPI controller considers non integer integration orders in determining the control action. This allows obtaining responses of the controlled system with different characteristics such as oscillations, stability and rise time. In this study FOPI strategy is simul

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Bharti, O. P., R. K. Saket, and S. K. Nagar. "Controller Design of DFIG Based Wind Turbine by Using Evolutionary Soft Computational Techniques." Engineering, Technology & Applied Science Research 7, no. 3 (2017): 1732–36. http://dx.doi.org/10.48084/etasr.1231.

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This manuscript illustrates the controller design for a doubly fed induction generator based variable speed wind turbine by using a bioinspired scheme. This methodology is based on exploiting two proficient swarm intelligence based evolutionary soft computational procedures. The particle swarm optimization (PSO) and bacterial foraging optimization (BFO) techniques are employed to design the controller intended for small damping plant of the DFIG. Wind energy overview and DFIG operating principle along with the equivalent circuit model is adequately discussed in this paper. The controller desig

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Bharti, O. P., R. K. Saket, and S. K. Nagar. "Controller Design of DFIG Based Wind Turbine by Using Evolutionary Soft Computational Techniques." Engineering, Technology & Applied Science Research 7, no. 3 (2017): 1732–36. https://doi.org/10.5281/zenodo.809531.

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This manuscript illustrates the controller design for a doubly fed induction generator based variable speed wind turbine by using a bioinspired scheme. This methodology is based on exploiting two proficient swarm intelligence based evolutionary soft computational procedures. The particle swarm optimization (PSO) and bacterial foraging optimization (BFO) techniques are employed to design the controller intended for small damping plant of the DFIG. Wind energy overview and DFIG operating principle along with the equivalent circuit model is adequately discussed in this paper. The controller desig

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Muraki, Satoshi, Ché Fornusek, Jacqui Raymond, and Glen Macartney Davis. "Muscle oxygenation during prolonged electrical stimulation-evoked cycling in paraplegics." Applied Physiology, Nutrition, and Metabolism 32, no. 3 (2007): 463–72. http://dx.doi.org/10.1139/h07-007.

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This study investigated cardiorespiratory responses and muscle oxygenation during prolonged electrical stimulation (ES)-evoked leg cycling in individuals with paraplegia (PARA). Four PARA and 6 able-bodied (AB) persons participated in this study. Subjects performed 10 min of passive cycling and 40 min of active cycling (PARA, ES cycling; AB, voluntary cycling) at workloads selected to elicit an equivalent oxygen uptake between groups. Cycling power output, cardiorespiratory responses, mechanical efficiency, and quadriceps muscle oxygenation (measured with near-infrared spectroscopy) were measu

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Laura, Collazo Solar, A. Costa Montiel Ángel, Vilaragut Llanes Miriam, Sousa Santos Vladimir, and de la Incera Núñez Carlos. "A universal model of three-phase asynchronous motors for electrical power system analysis." International Journal of Power Electronics and Drive Systems 14, no. 01 (2023): 167~173. https://doi.org/10.11591/ijpeds.v14.i1.pp167-173.

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The high incidence of three-phase asynchronous motors (TAM) in global energy consumption and its influence on the operation of electrical systems makes it necessary to develop models that allow their analysis effectively. Based on this, this paper presents a universal model of TAM based on the relationship between the active and reactive power of the TAM and the deviation of voltage and frequency. It can be applied to any general-purpose TAM and is very useful when representing these motors in electrical power system studies. The model parameters were obtained from a statistical analysis perfo

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Beck, Matthias, Joan Buckley, and Seamus O’Reilly. "Managing pharmaceutical shortages: an overview and classification of policy responses in Europe and the USA." International Review of Administrative Sciences 86, no. 4 (2019): 622–40. http://dx.doi.org/10.1177/0020852318815330.

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This exploratory article gives a cross-sectional account of how established health-care systems have responded to the novel challenge of drug shortages. In line with previous research, our analysis confirms the existence of strong path dependence in the adoption of policy responses. This path dependence is manifested in a pronounced typology of response patterns where jurisdictional approaches to the management of drug shortages differ along two core dimensions. These are the salience attributed to the problem, and the level to which state organisations engage with the problem. These patterns

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Kaewnukultorn, Thunchanok, and Steven Hegedus. "Impact of Impedances and Solar Inverter Grid Controls in Electric Distribution Line with Grid Voltage and Frequency Instability." Energies 17, no. 21 (2024): 5503. http://dx.doi.org/10.3390/en17215503.

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The penetration of solar energy into centralized electric grids has increased significantly during the last decade. Although the electricity from photovoltaics (PVs) can deliver clean and cost-effective energy, the intermittent nature of the sunlight can lead to challenges with electric grid stability. Smart inverter-based resources (IBRs) can be used to mitigate the impact of such high penetration of renewable energy, as well as to support grid reliability by improving the voltage and frequency stability with embedded control functions such as Volt-VAR, Volt–Watt, and Frequency–Watt. In this

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Azab, Mohamed. "Comparative Study of BLDC Motor Drives with Different Approaches: FCS-Model Predictive Control and Hysteresis Current Control." World Electric Vehicle Journal 13, no. 7 (2022): 112. http://dx.doi.org/10.3390/wevj13070112.

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The control techniques of the brushless DC (BLDC) motor have gained a large amount of interest in recent years, with their use being implemented in order to achieve a high-performance drive, including quick transient response and high-quality waveforms at the steady state. This paper provides a comparative study between three control schemes of BLDC motors: the direct power control scheme using a finite control set model predictive control (FCS-MPC) approach, the stator current controlled scheme using an FCS-MPC approach, and the stator current controlled scheme using ON–OFF hysteresis current

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Ali, Tayyab, Suheel Abdullah Malik, Ibrahim A. Hameed, Amil Daraz, Hana Mujlid, and Ahmad Taher Azar. "Load Frequency Control and Automatic Voltage Regulation in a Multi-Area Interconnected Power System Using Nature-Inspired Computation-Based Control Methodology." Sustainability 14, no. 19 (2022): 12162. http://dx.doi.org/10.3390/su141912162.

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The stability control of nominal frequency and terminal voltage in an interconnected power system (IPS) is always a challenging task for researchers. The load variation or any disturbance affects the active and reactive power demands, which badly influence the normal working of IPS. In order to maintain frequency and terminal voltage at rated values, controllers are installed at generating stations to keep these parameters within the prescribed limits by varying the active and reactive power demands. This is accomplished by load frequency control (LFC) and automatic voltage regulator (AVR) loo

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da Silva, Marianne Lucena, Ivo Vieira de Sousa Neto, Alexandra C. G. B. de Lima, et al. "Effects of Home-Based Electrical Stimulation on Plasma Cytokines Profile, Redox Biomarkers, and Metalloproteinases in the Heart Failure with Reduced Ejection Fraction: A Randomized Trial." Journal of Cardiovascular Development and Disease 9, no. 12 (2022): 463. http://dx.doi.org/10.3390/jcdd9120463.

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Background: Low-frequency electrical stimulation (LFES) is an adjuvant method for heart failure (HF) patients with restrictions to start an exercise. However, the impact on molecular changes in circulating is unknown. We investigated the effects of 10 weeks of home-based LFES on plasma cytokines profile, redox biomarkers, metalloproteinases (MMPs) activity, and exercise performance in HF patients. Methods: Twenty-four HF patients (52.45 ± 9.15 years) with reduced ejection fraction (HFrEF) (EF < 40%), were randomly assigned to a home-based LFES or sham protocol. Plasma cytokines profile was

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Kireyev, V. G., K. P. Akinin, and A. A. Filomenko. "FEATURES AND PRINCIPLES OF THE DEVELOPMENT OF BRUSHLESS MAGNETOELECTRIC SYSTEMS OF THE RETURN-ROTARY MOTION." Tekhnichna Elektrodynamika 2021, no. 3 (2021): 19–27. http://dx.doi.org/10.15407/techned2021.03.019.

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The paper reviews the results of studies of brushless magnetoelectric systems of return-rotary motion, carried out for many years at the Electrodynamics Institute of the National Academy of Sciences of Ukraine. Structures of specialized brushless magnetoelectric motors with elastic magnetic coupling between the stator and the rotor are presented. An example of structural optimization of the motor is given. The electromechanical characteristics of the motors of the return-rotary motion are described and the indexes of their efficiency are proposed. An example of the formation of functional depe

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Oh, Byeongsang, Kyeore Bae, Gillian Lamoury, et al. "The Effects of Tai Chi and Qigong on Immune Responses: A Systematic Review and Meta-Analysis." Medicines 7, no. 7 (2020): 39. http://dx.doi.org/10.3390/medicines7070039.

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Background: Effective preventative health interventions are essential to maintain well-being among healthcare professionals and the public, especially during times of health crises. Several studies have suggested that Tai Chi and Qigong (TQ) have positive impacts on the immune system and its response to inflammation. The aim of this review is to evaluate the current evidence of the effects of TQ on these parameters. Methods: Electronic searches were conducted on databases (Medline, PubMed, Embase and ScienceDirect). Searches were performed using the following keywords: “Tai Chi or Qigong” and

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Andersson, Helena, Anette Karlsen, Rune Blomhoff, Truls Raastad, and Fawzi Kadi. "Active recovery training does not affect the antioxidant response to soccer games in elite female players." British Journal of Nutrition 104, no. 10 (2010): 1492–99. http://dx.doi.org/10.1017/s0007114510002394.

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Changes in plasma endogenous and dietary antioxidants and oxidative stress markers were studied following two 90 min elite female soccer games separated by 72 h of either active or passive recovery. The active recovery group (n 8) trained for 1 h at 22 and 46 h after the first game (low-intensity cycling and resistance training), while the passive group rested (n 8). Blood samples were taken before the games; immediately after the games; 21, 45 and 69 h after the first game; and immediately after the second game. The oxidative stress markers and antioxidants were not affected by active recover

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Laksmi, B. Nur Vidia, Muhammad Syahril Mubarok, Moh. Zaenal Effendi, Widi Aribowo, and Tian-Hua Liu. "Cascaded AC-DC parallel boost-flyback converter for power factor correction." International Journal of Electrical and Computer Engineering (IJECE) 15, no. 1 (2025): 224–34. https://doi.org/10.11591/ijece.v15i1.pp224-234.

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A two-stage power factor correction (PFC) topology achieves a higherpower factor quality and lower harmonic distortion than a single-stageconverter. This paper introduces a two-stage PFC topology using a parallelboost and flyback converter which is employed as a voltage regulator Themain boost converter is used for PFC and the other is the active filter circuit.The filter is implemented to improve the quality of phase-current andeliminate the switching loss. Furthermore, a reaction curve ofZiegler-Nichol’s method determines the controller parameter for cascadedPFC converter circuit. Simu

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Chen, Yuxin, Haoyu Yang, Faguang Wang, Xuejing Lu, and Li Hu. "Modulatory effects of transcutaneous auricular vagus nerve stimulation (taVNS) on attentional processes." General Psychiatry 36, no. 6 (2023): e101176. http://dx.doi.org/10.1136/gpsych-2023-101176.

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BackgroundThe modulatory effect of transcutaneous auricular vagus nerve stimulation (taVNS) on attention has varied in previous studies. This inconsistency might be attributed to the combined influence of the modulation effect on the different attentional functions, including alerting, orienting and executive control.AimsWe aimed to preliminarily examine the modulatory effects of taVNS on different attentional functions.MethodsFifty-nine healthy participants were recruited and were randomly assigned to taVNS (receiving taVNS for 20 minutes) or control (receiving taVNS for 30 seconds) groups. A

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Fierens, Guy, Charlotte Borgers, Tristan Putzeys, Joris Walraevens, Astrid Van Wieringen, and Nicolas Verhaert. "The Impact of Location and Device Coupling on the Performance of the Osia System Actuator." BioMed Research International 2022 (April 2, 2022): 1–16. http://dx.doi.org/10.1155/2022/9079903.

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Active transcutaneous bone conduction (BC) devices offer the benefit of improved power output compared to passive transcutaneous devices and remove the risk of skin infections that are more common in traditional percutaneous BC devices. Despite these advantages, more research is needed on implant location, device coupling, and their influence on device performance. This study is aimed at quantifying the extent to which certain parameters affect device output when using the Osia® system actuator. Parameters under study are (1) implant location, (2) comparison with the actuator of a state-of-the

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Laksmi B., Nur Vidia, Muhammad Syahril Mubarok, Moh Zaenal Effendi, Widi Aribowo, and Tian-Hua Liu. "Cascaded AC-DC parallel boost-flyback converter for power factor correction." International Journal of Electrical and Computer Engineering (IJECE) 15, no. 1 (2025): 224. http://dx.doi.org/10.11591/ijece.v15i1.pp224-234.

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A two-stage power factor correction (PFC) topology achieves a higher power factor quality and lower harmonic distortion than a single-stage converter. This paper introduces a two-stage PFC topology using a parallel boost and flyback converter which is employed as a voltage regulator The main boost converter is used for PFC and the other is the active filter circuit. The filter is implemented to improve the quality of phase-current and eliminate the switching loss. Furthermore, a reaction curve of Ziegler-Nichol’s method determines the controller parameter for cascaded PFC converter circuit. Si

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Kessler, Earl. "Building Disaster Risk Reduction in Asia: A Way Forward." Open House International 31, no. 1 (2006): 142–47. http://dx.doi.org/10.1108/ohi-01-2006-b0017.

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Asian Disaster Preparedness Center (ADPC) was established in 1986. It was restructured in July 2003 to focus on specific technical areas: climate variability and change management, urban disaster risk management, public health in emergencies, building national and provincial disaster management systems, and community based disaster risk management (CBDRM), promoting regional cooperation, identifying disaster risk management (DRM) needs in the region and developing strategic solutions. The consolidation enables ADPC's teams to work more effectively with stakeholders and build cross-team inputs

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Trewin, Adam J., Lewan Parker, Christopher S. Shaw, et al. "Acute HIIE elicits similar changes in human skeletal muscle mitochondrial H2O2 release, respiration, and cell signaling as endurance exercise even with less work." American Journal of Physiology-Regulatory, Integrative and Comparative Physiology 315, no. 5 (2018): R1003—R1016. http://dx.doi.org/10.1152/ajpregu.00096.2018.

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It remains unclear whether high-intensity interval exercise (HIIE) elicits distinct molecular responses to traditional endurance exercise relative to the total work performed. We aimed to investigate the influence of exercise intensity on acute perturbations to skeletal muscle mitochondrial function (respiration and reactive oxygen species) and metabolic and redox signaling responses. In a randomized, repeated measures crossover design, eight recreationally active individuals (24 ± 5 yr; V̇o2peak: 48 ± 11 ml·kg−1·min−1) undertook continuous moderate-intensity [CMIE: 30 min, 50% peak power outp

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Agrawal, Shubham, Rohit Gupta, Poom Sittisomwong, Srikanth Singamaneni, and Peng Bai. "Quantification of the Mesoscale Spatiotemporal Heterogeneities in Nickel-Rich Layered Oxide Cathodes By Raman Spectroscopy." ECS Meeting Abstracts MA2022-02, no. 1 (2022): 95. http://dx.doi.org/10.1149/ma2022-02195mtgabs.

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Lithium-ion batteries consisting of the particulate porous electrodes, are the dominant energy storage devices, however, they suffer from random failures and safety-related accidents. Such arbitrary incidents arise from the spatiotemporal heterogeneities occurring due to the material thermodynamics[1] which results to local hot and cold spots and early battery failures. The past investigations of the heterogeneities in the battery materials rely on the sophisticated synchrotron X-ray methods[2]–[4], which are not easily accessible. Instead, in this study, we employ Raman spectroscopy on an in

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Bajić, Senka, Dragoljub Veljović, and Borko Đ. Bulajić. "Impact of Physical Fitness on Emergency Response: A Case Study of Factors That Influence Individual Responses to Emergencies among University Students." Healthcare 11, no. 14 (2023): 2061. http://dx.doi.org/10.3390/healthcare11142061.

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(1) Background: The purpose of this study was to ascertain whether there is a direct correlation between the physical fitness of the general population, specifically students, and the response times to fire-emergency-related building evacuations and to identify which physical fitness factors more significantly influenced emergency movement times. (2) Methods: In this quantitative investigation, 21 students (both men and women of the same age) volunteered to participate. We first evaluated their physical fitness; then, we analyzed their reaction times and speed. (3) Results: The results of this

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