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Journal articles on the topic 'Dq-frame'

Author: Grafiati

Published: 11 December 2022

Last updated: 25 January 2023

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1

Qi, Huanruo, Ningkang Zheng, Xiangyang Yan, and Yilong Kang. "Study on High Performance Control of the Machine-Side Converter of Doubly-Fed Turbines under Grid Distortion." E3S Web of Conferences 185 (2020): 01060. http://dx.doi.org/10.1051/e3sconf/202018501060.

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Two control strategies of DFIG under grid distortion are firstly summarized, namely, the control strategy of PI-R current controller based on dq reference frame and the control strategy of PI current controller based on the multiple rotating dq reference frame, and their advantages and disadvantages are analysed. On the basis of dynamic modelling of DFIG under grid distortion, in view of the defect that DFIG coupling is not considered in the control strategy of PI-R current controller based on dq reference frame, an improved control strategy considering motor coupling is proposed. In the end, the modelling and simulation of the unimproved and improved control strategies of PI-R current controller based on dq reference frame are carried out, and the simulation results verified the effectiveness of the improved control strategy.

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2

Zou, Changyue, Bangyin Liu, Shanxu Duan, and Rui Li. "Stationary Frame Equivalent Model of Proportional-Integral Controller in dq Synchronous Frame." IEEE Transactions on Power Electronics 29, no. 9 (September 2014): 4461–65. http://dx.doi.org/10.1109/tpel.2013.2296789.

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3

Jiang, Baohong, and Xinian Li. "A Novel Fast Voltage Sequence Component Detector of Unbalanced Three-Phase System." MATEC Web of Conferences 173 (2018): 01036. http://dx.doi.org/10.1051/matecconf/201817301036.

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The fast and accurate voltage sequence component detection of unbalanced three-phase system is of major importance for the industrial continuous processing. The traditional method is to calculate the voltage in dq synchronous reference frame. This results in low order harmonics and long detection time. A novel fast voltage sequence components detector is proposed in this paper. It is to calculate the sequence component projection on dq rotating reference frame with h times the fundamental angular velocity. Simulation results demonstrate the validity of the algorithm.

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4

Li, Xiaobo, Mingxian Li, Hua Chai, and Binbing Wu. "Noise Immunity Analysis and Improvement of dq Frame Based Open-Loop Phase Detection Scheme." Energies 13, no. 5 (March 3, 2020): 1145. http://dx.doi.org/10.3390/en13051145.

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To improve the noise immunity of a dq frame based open-loop phase detection (OPD) under high-frequency noise grid conditions, this paper develops a detailed model to quantitatively evaluate the phase detection error and noise immunity. It is found that the OPD behaves differently in terms of noise immunity when the dq frame is in different angle positions with the grid voltage. When the grid voltage coincides with the d axis, the high-frequency noise has the smallest impact on the phase detection accuracy, and the OPD thus has the strongest noise immunity. Inspired by this conclusion, an improved OPD algorithm is proposed in this paper, which can effectively reduce the phase detection error by fine-tuning the rotation angle of the dq frame to ensure that the angle between the voltage vector and d axis is always close to 0. The improved OPD algorithm has a fast and precise character to detect the phase information with less error and is flexible for application. Under heavy noise grid conditions, it can also effectively shorten the dynamic response time in the phase-detecting process using a low-pass filter (LPF) with a higher cut-off frequency. The correctness of the noise immunity analysis and the effectiveness of the improved OPD algorithm are verified by the simulations and experimental results in MATLAB and RT-LAB.

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5

Costa, Israel D. L., Danilo I. Brandao, Lourenço Matakas Junior, Marcelo G. Simões, and Lenin M. F. Morais. "Analysis of Stationary- and Synchronous-Reference Frames for Three-Phase Three-Wire Grid-Connected Converter AC Current Regulators." Energies 14, no. 24 (December 10, 2021): 8348. http://dx.doi.org/10.3390/en14248348.

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The current state of the art shows that unbalance and distortion on the voltage waveforms at the terminals of a grid-connected inverter disturb its output currents. This paper compares AC linear current regulators for three-phase three-wire voltage source converters with three different reference frames, namely: (1) natural (abc), (2) orthogonal stationary (αβ), and (3) orthogonal synchronous (dq). The quantitative comparison analysis is based on mathematical models of grid disturbances using the impedance-based analysis, the computational effort assessment, as well as the steady-state and transient performance evaluation based on experimental results. The control scheme devised in the dq-frame has the highest computational effort and inferior performance under negative-sequence voltage disturbances, whereas it shows superior performance under positive-sequence voltages among the reference frames evaluated. In contrast, the stationary natural frame abc has the lowest computational effort due to its straightforward implementation, with similar results in terms of steady-state and transient behavior. The αβ-frame is an intermediate solution in terms of computational cost.

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Macana, Carlos A., Eduardo Mojica-Nava, Hemanshu R. Pota, Josep M. Guerrero, and Juan C. Vasquez. "A Novel Compact dq-Reference Frame Model for Inverter-Based Microgrids." Electronics 8, no. 11 (November 11, 2019): 1326. http://dx.doi.org/10.3390/electronics8111326.

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The development and the experimental validation of a novel dynamic model of an islanded three-phase Inverter-based Microgrid (IMG) is presented in this paper. The proposed model reproduces the relevant system dynamics without excessive complexity and enough accuracy. The dynamics of the IMG are captured with a compact and scalable dynamic model, considering inverter based distributed generators with d-current droop primary and proportional resonant inner controllers. The complete development of the model, the practical assumptions, and the accurate proportional power sharing of the primary control technique are shown. The accuracy performance was verified in experiments performed at the Aalborg Intelligent Microgrids Laboratory for an islanded IMG case.

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7

Moungkhum, Nopparat, and Wanchai Subsingha. "Voltage Control by DQ Frame Technique of SVPWM AC- DC Converter." Energy Procedia 34 (2013): 341–50. http://dx.doi.org/10.1016/j.egypro.2013.06.762.

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8

Poza, J., E. Oyarbide, D. Roye, and M. Rodriguez. "Unified reference frame dq model of the brushless doubly fed machine." IEE Proceedings - Electric Power Applications 153, no. 5 (2006): 726. http://dx.doi.org/10.1049/ip-epa:20050404.

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9

Abad, Gonzalo, Alain Sanchez-Ruiz, Juan José Valera-García, and Aritz Milikua. "Analysis and Design Guidelines for Current Control Loops of Grid-Connected Converters Based on Mathematical Models." Energies 13, no. 21 (November 9, 2020): 5849. http://dx.doi.org/10.3390/en13215849.

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Having a method for analyzing and designing regulators of controls that contain many current loops such as active filters is not a trivial task. There can be many parameters of regulators and filters that must be carefully selected in order to fulfill certain desired requirements. For instance, these can be stability, dynamic response, robustness under uncertainty of parameters, and rejection capability to switching harmonics. Hence, this paper provides general analysis guidelines for designing current control loops by using mathematical models in an αβ reference frame. Then, by using the proposed modeling tool, a multi-objective tuning algorithm is proposed that helps obtain all the control loops’ regulator and filter parameters, meeting all the desired requirements. Thus, the proposed analysis and design methodology is illustrated by applying it to three different controls conceived in a dq rotating reference frame with PI (Proportional Integral) regulators. The first control presents two current loops (simple dq current control), the second control uses four current loops (dual vector control, for unbalanced loads), while the third control presents eight current loops (active filter controlling current harmonics). Several experimental and simulation results show the effectiveness and usefulness of the proposed method. Since the mathematical model employed is in the αβ reference frame, it can also be easily applied to controls conceived in a αβ reference frame using resonant regulators, providing also a common comparative framework.

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10

Kumar, Mahender, M. A. Uqaili, Z. A. Memon, and Bhagwan Das. "Mathematical Modeling of THD Mitigation Using HAPF for UPS System with Experimental Analysis via Hybrid Interface of Optical USB and Power Quality Meter." Mathematical Problems in Engineering 2021 (September 29, 2021): 1–15. http://dx.doi.org/10.1155/2021/3981287.

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This paper discusses a novel analysis scheme based on the hybrid interface of Optical USB and Power Quality Meter for measuring Total Harmonic Distortion (THD) that exists in the Uninterruptable Power Supply (UPS) system and connected load. The designed hybrid interface experimentally analyzes the power quality and harmonics of the Uninterrupted Power Supply (UPS) system, and mitigation is proposed with the proposed Single-Phase Hybrid Active Power Filter (HAPF) based on instantaneous Power Theory (PQ) with hysteresis control technique and synchronous frame reference (DQ) with hysteresis control techniques at nonlinear load. This study authenticates and gives appropriate measurements in analyzing the harmonics and voltage distortion during conversion of power. The designed work offers the compensation and elimination of harmonic currents using PQ and DQ theory at different nonlinear loads. The proposed HAPF for the UPS system has demonstrated the significant reduction in THD using proposed Power Theory (PQ) with hysteresis control technique from 46.58% to 1.51% and by using DQ theory with hysteresis control technique has reduced THD from 46.58% to 1.38%. Finally, the results are compared between PQ and DQ. It is validated via results that DQ theory eliminated harmonics and also having less THD as compared to PQ-theory. Furthermore, one of the key aspects of the work is the analysis of power quality using Optical USB Interface (OC4USB) and FLUKE series power quality analyzer.

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11

Van, Chi Nguyen, and Hoang Dang Danh. "Control shunt active filter based on dq frame using current model prediction." IAES International Journal of Robotics and Automation (IJRA) 8, no. 4 (December 1, 2019): 301. http://dx.doi.org/10.11591/ijra.v8i4.pp301-312.

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The nonlinear loads present more in the power systems in the practice today by developing of electronic technology and using the small distributed power sources (solar power, wind power etc.), this causes the increasing the high frequency switch devices etc. in the power network. Nonlinear loads cause non-sinusoidal currents and voltages with harmonic components, increasing the reactive power, overload of power lines and electrical devices, low power factor and affecting badly to the networks. Shunt active filters (SAF) with current controlled voltage source inverters (CCVSI) are used effectively to reduce the harmonics and to balance the phases sinusoidal source currents by generating the currents to compensate the harmonic currents caused by the nonlinear loads. In this paper we suppose a control strategy to generate the compensation currents of SAF by using the current model predictive engineering. This method is better than the control strategy using PI controller in term of transient time. The desired compensation currents can track exactly the reference compensation currents on the dq frame. The simulation results implemented on the nonlinear load, a full bridge rectifier and 3 phase unbalance load, show that the transient period decrease from 0.1s to 0.02s in comparing with PI controller. The experimental results proof that the THD of source currents decrease from 24.8% to 5.4% when using the proposed method.

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12

Zhang, Yongxin, Fei Li, Liuchen Zhang, Shiquan Wen, Mingyao Ma, and Xing Zhang. "Modeling and frequency characteristic analysis of DSOGI-PLL in dq reference frame." Energy Reports 7 (November 2021): 545–51. http://dx.doi.org/10.1016/j.egyr.2021.08.007.

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13

Dang Danh, Hoang, and Chi Nguyen Van. "Control Shunt Active Filter Based on dq Frame using Current Model Prediction." International Journal of Electrical and Electronics Engineering 6, no. 4 (April 25, 2019): 1–8. http://dx.doi.org/10.14445/23488379/ijeee-v6i4p101.

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14

Perkins, B. K., and M. R. Iravani. "Dynamic modeling of high power static switching circuits in the dq-frame." IEEE Transactions on Power Systems 14, no. 2 (May 1999): 678–84. http://dx.doi.org/10.1109/59.761897.

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15

Bobrowska-Rafal, M., K. Rafal, M. Jasinski, and M. Kazmierkowski. "Grid synchronization and symmetrical components extraction with PLL algorithm for grid connected power electronic converters - a review." Bulletin of the Polish Academy of Sciences: Technical Sciences 59, no. 4 (December 1, 2011): 485–97. http://dx.doi.org/10.2478/v10175-011-0060-8.

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Grid synchronization and symmetrical components extraction with PLL algorithm for grid connected power electronic converters - a reviewIn this paper, a review of Phase Locked Loop (PLL) algorithms and symmetrical component extraction methods intended for grid-connected power electronic converters are presented. Proposed classification is based on voltage representation in three coordinates: natural (abc), stationary (αβ) and rotating coordinates (dq). The three selected algorithms are described in details: Dual Second Order Generalized Integrator (DSOGI-PLL), Dual Virtual Flux - both in stationary coordinates. The third one, in rotating dq coordinates, is Dual Synchronous Reference Frame PLL (DSRF-PLL). A comparison of PLL algorithms is presented. Also, selected experimental results are given to verify practical application of discussed algorithms.

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16

Im, Seong-Hwan, and Bon-Gwan Gu. "Study of Induction Motor Inter-Turn Fault Part I: Development of Fault Models with Distorted Flux Representation." Energies 15, no. 3 (January 26, 2022): 894. http://dx.doi.org/10.3390/en15030894.

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An inter-turn fault (ITF) is one of the most frequent induction motor faults; thus, many previous works have studied its model and diagnosis. However, previous works, simplifying the specific distorted flux distribution by the ITF, presented induction motor fault models and focused on the fault signal analysis for diagnoses. Consequently, these results are only adequate for the pretested motor and sensitive to fault signal distortion. This paper presents an induction motor ITF model in the stationary DQ frame, for a model-based diagnosis. Furthermore, to describe the distorted flux distribution along the air gap by the ITF, the rotor flux linkages are described in the independent DQ frame of every pole, and the mutual flux linkages among the rotor, stator, and ITF windings are specifically modeled. Hence, the proposed full model has many current states and mutual inductances to describe the high pole number motor. A simplified model is also proposed for easier usage in the diagnosis, with light ITF to overcome this complexity. Finally, simulation and experiments are performed to verify the presented induction motor ITF fault models.

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17

Yang, Daliang, Li Yin, Shengguang Xu, and Ning Wu. "Power and Voltage Control for Single-Phase Cascaded H-Bridge Multilevel Converters under Unbalanced Loads." Energies 11, no. 9 (September 14, 2018): 2435. http://dx.doi.org/10.3390/en11092435.

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The conventional control method for a single-phase cascaded H-bridge (CHB) multilevel converter is vector (dq) control; however, dq control requires complicated calculations and additional time delays. This paper presents a novel power control strategy for the CHB multilevel converter. A power-based dc-link voltage balance control is also proposed for unbalanced load conditions. The new control method is designed in a virtual αβ stationary reference frame without coordinate transformation or phase-locked loop (PLL) to avoid the potential issues related to computational complexity. Because only imaginary voltage construction is needed in the proposed control method, the time delay from conventional imaginary current construction can be eliminated. The proposed method can obtain a sinusoidal grid current waveform with unity power factor. Compared with the conventional dq control method, the power control strategy possesses the advantage of a fast dynamic response. The stability of the closed-loop system with the dc-link voltage balance controller is evaluated. Simulation and experimental results are presented to verify the accuracy of the proposed power and voltage control method.

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18

Li, Dan, and Ting Ting Cai. "Control Strategy for VSC-HVDC under Unbalanced Grid Voltages." Applied Mechanics and Materials 863 (February 2017): 214–19. http://dx.doi.org/10.4028/www.scientific.net/amm.863.214.

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This paper describes the use of an unbalanced control strategy to solve the faults occur in AC grid side of High voltage direct current based on Voltage Source Converter (VSC-HVDC) system. This method divides the voltage and current parameters into negative-sequence and positive-sequence. It can be obtained that the negative-sequence appears as double-frequency component in the positive-sequence synchronous reference frame; while, it appears as dc component in the negative-sequence synchronous reference frame. To mitigate the unfavourable impact of the unbalance fault, such as the DC link ripples, the dual vector control algorithm in dq synchrounous reference frame is designed. Simulation results demonstrate the validity and the effectiveness of the proposed control scheme.

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19

Al Hassan, Hashim A., Thamer Alharbi, Zhi-Hong Mao, and Brandon M. Grainger. "Reduced Order AC Microgrid Model for Secondary Controller Design Using dq Reference Frame." Electric Power Systems Research 206 (May 2022): 107781. http://dx.doi.org/10.1016/j.epsr.2022.107781.

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20

Zhou, Xiao Jie, and Yi Ruan. "Study of DQ Rotating Frame Control for Single-Phase Photovoltaic Grid-Connected System." Advanced Materials Research 542-543 (June 2012): 99–102. http://dx.doi.org/10.4028/www.scientific.net/amr.542-543.99.

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Nowadays solar photovoltaic energy has become an important alternative energy sources. This paper focuses on single-phase PV grid-connected system, a reference frame which used for three-phase inverter has been used in this single-phase grid-connected inverter. The in-quadrature signal is generated used T/4 transport delay technique. This single-phase grid-connected inverter uses space vector pulse width modulation(SVPWM) method. Finally, the 3KW small power single-phase photovoltaic inverter system model is built to verify the presented control strategy by using the Matlab/Simulink.

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21

Chersi, Alberto, Teresa F. Romano, and Francesco Chillemi. "Preparation and Isolation of Antibodies to Human MHC Class II alpha Chains by Aid of Synthetic Peptides." Zeitschrift für Naturforschung C 44, no. 9-10 (October 1, 1989): 813–18. http://dx.doi.org/10.1515/znc-1989-9-1020.

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Abstract Antibodies against HLA Class II alpha chains were prepared by using as immunogens synthetic peptides selected from the HLA -DQ 1 alpha chains sequence. Antibodies raised against peptide E2 , a 15-residue fragment of the polymorphic first domain, reacted preferentially with cells with the DQ 1 phenotype; however, despite the low sequence homology of this fragment with corresponding segments in DQw2 and DQw3 alpha chains, a partial crossreactivity with cells not expressing the DQw 1 specificity was detected. Antibodies to peptide H , selected from the monomorphic frame, might be specific for DO alloantigens, and presumably do not react with DR antigens. The two peptides, in addition, bind anti-Class II antibodies from the serum of a rabbit immunized with human cells, and appear to represent immunogenic linear determinants in the native glycoprotein molecule.

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22

Taha Hussein, Hussein, Mohamed Ammar, and Mohamed Moustafa Hassan. "Induction Motors Stator Fault Analysis based on Artificial Intelligence." Indonesian Journal of Electrical Engineering and Computer Science 2, no. 1 (April 1, 2016): 69. http://dx.doi.org/10.11591/ijeecs.v2.i1.pp69-78.

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This article presents a method for fault detection and diagnosis of stator inter-turn short circuit in three phase induction machines. The technique is based on the stator current and modelling in the dq frame using an Adaptive Neuro-Fuzzy artificial intelligence approach. The developed fault analysis method is illustrated using MATLAB simulations. The obtained results are promising based on the new fault detection approach.

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23

Alharbi, Mohammed, Semih Isik, Abdulaziz Alkuhayli, and Subhashish Bhattacharya. "Power Ripple Control Method for Modular Multilevel Converter under Grid Imbalances." Energies 15, no. 10 (May 12, 2022): 3535. http://dx.doi.org/10.3390/en15103535.

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Modular multilevel converters (MMCs) are primarily adopted for high-voltage applications, and are highly desired to be operated even under fault conditions. Researchers focused on improving current controllers to reduce the adverse effects of faults. Vector control in the DQ reference domain is generally adopted to control the MMC applications. Under unstable grid conditions, it is challenging to control double-line frequency oscillations in the DQ reference frame. Therefore, active power fluctuations are observed in the active power due to the uncontrolled AC component’s double line frequency component. This paper proposes removing the active power’s double-line frequency under unbalanced grid conditions during DQ transformation. Feedforward and feedback control methods are proposed to eliminate ripple in active power under fault conditions. An extraction method for AC components is also proposed for the power ripple control to eliminate the phase error occurring with the conventional high-pass filters. The system’s stability with the proposed controller is tested and compared with a traditional MMC controller using the Nyquist stability criterion. A real-time digital simulator (RTDS) and Xilinx Virtex 7-based FPGA were used to verify the proposed control methods under single-line-to-ground (SLG) faults.

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24

Vázquez-Gallego, Francisco, Luis Alonso, and Jesus Alonso-Zarate. "Energy Analysis of Contention Tree-Based Access Protocols in Dense Machine-to-Machine Area Networks." Journal of Sensors 2015 (2015): 1–12. http://dx.doi.org/10.1155/2015/685164.

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Machine-to-Machine (M2M) area networks aim at connecting an M2M gateway with a large number of energy-constrained devices that must operate autonomously for years. Therefore, attaining high energy efficiency is essential in the deployment of M2M networks. In this paper, we consider a dense M2M area network composed of hundreds or thousands of devices that periodically transmit data upon request from a gateway or coordinator. We theoretically analyse the devices’ energy consumption using two Medium Access Control (MAC) protocols which are based on a tree-splitting algorithm to resolve collisions among devices: the Contention Tree Algorithm (CTA) and the Distributed Queuing (DQ) access. We have carried out computer-based simulations to validate the accuracy of the theoretical models and to compare the energy performance using DQ, CTA, and Frame Slotted-ALOHA (FSA) in M2M area networks with devices in compliance with the IEEE 802.15.4 physical layer. Results show that the performance of DQ is totally independent of the number of contending devices, and it can reduce the energy consumed per device in more than 35% with respect to CTA and in more than 80% with respect to FSA.

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25

Rubocki, R. J., D. R. Lee, W. R. Lie, N. B. Myers, and T. H. Hansen. "Molecular evidence that the H-2D and H-2L genes arose by duplication. Differences between the evolution of the class I genes in mice and humans." Journal of Experimental Medicine 171, no. 6 (June 1, 1990): 2043–61. http://dx.doi.org/10.1084/jem.171.6.2043.

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To resolve issues regarding the evolution of D region class I MHC genes and their relationship to other class I-encoding regions of the mouse, as well as man, we characterized the class I genes from the Dq region of the B10.AKM mouse strain. The Dq region was selected because it was known to express multiple gene products, yet two of the products previously characterized have structural features in common with the Ld molecule. Since DNA hybridization data defined similarities between the Dd and Dq regions, we used low-copy genomic or oligonucleotide probes derived from the Dd region of BALB/c (H-2d) to screen a B10.AKM cosmid library. Cosmid clones containing Dq, D2q, D3q, D4q, Lq, and Q1q genes have been isolated and aligned with the corresponding genes of the BALB/c MHC, thus demonstrating a similar gene organization. The two classical transplantation genes, Dq and Lq were found to be strikingly similar to each other such that exons 1-3 of Dq and Lq, are approximately 97% homologous, and exons 4-8 are identical. Furthermore, the implied amino acid sequences of both Lq and Dq molecules show considerable homology to Ld, particularly in regions presumed to be involved in ligand binding. These comparisons suggest not only that the Dq and Lq genes arose from the duplication of an Ld-like progenitor, but also that there is a selective advantage for the maintenance of an Ld-like structure. In addition, the 5' portion of the D4q gene was sequenced and found to have a 13-bp deletion and a 4-bp insertion within the alpha 2 exon. These result in a frame shift that creates a premature termination codon and potential polyadenylation site, respectively. Thus, D4q does not encode a typical class I molecule. Sequence comparisons suggest that the D4q gene did not arise from a duplication event involving an Ld-like gene such as Dq and Lq. Interestingly, the D4q molecule, if produced, would have amino acid residues in common with K and/or Q molecules that differ from those observed in D/L molecules. These findings, in conjunction with hybridization data, provide evidence that the D2, D3, and D4 genes were derived from Q genes by an unequal crossover event. Additional hybridization data using low-copy D region probes suggest that several different D region gene organizations exist among mice of different haplotypes. These and other recent molecular studies provide multiple examples of expansion and contraction of the class I genes in the D region.(ABSTRACT TRUNCATED AT 400 WORDS)

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Jiang, Shan, Felipe Arraño-Vargas, Zhiwei Shen, and Georgios Konstantinou. "The Impact of Overlap Period on the Stability of Current-Controlled Alternate Arm Converter Based on dq Frame Impedance Analysis." Electronics 11, no. 3 (January 19, 2022): 301. http://dx.doi.org/10.3390/electronics11030301.

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As a variant modular converter configuration, the alternate arm converter (AAC) is well-suited for high-voltage power transmission and large-scale integration of renewables. In contrast to conventional multilevel converters, the director switches in the arms of AAC lead to the introduction of an overlap period, during which circuiting current can flow through the two arms in the same phase. Thus, fixed or variable overlap period control can be implemented in AAC systems so as to dynamically balance stored arm energy. However, the control of overlap period is linked to instability issues that might impede the safe operation of AAC systems, which are yet to be reported. In this paper, the stability of an AAC system is demonstrated based on measured grid and converter impedance, in conjunction with impedance-based stability criterion in the dq frame. The interaction between harmonic sources at AC and DC sides of the AAC system is analyzed to determine resonant frequencies in the AC current when any potential resonance is identified in the dq frame. Novel results with respect to the impact of overlap period on the system stability are obtained by depicting and comparing the Eigenloci in the polar plot, which are validated by real-time simulations.

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Zhao, Zhang Le, You Bing Zhang, and Jun Qi. "Dynamic Simulation for Grid-Connected Inverters of Distributed Generation Based on DIgSILENT Software." Applied Mechanics and Materials 291-294 (February 2013): 2042–46. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2042.

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This paper introduces some typical control methods for the grid-connected inverters in the distributed generation (DG) systems, the double-loop control strategy is focused on and analyzed in detail. The proposed outer-loop control strategies are summarized. Meanwhile, the inner-loop control method established on dq rotating frame is introduced. The simulation models of the inverters for DG in the DIgSILENT software are introduced, and the simulations for the proposed control strategies are realized.

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28

Fellag, Sid. "Steady State and Dynamic Evaluation of Electrical Shaft System." Journal of Electrical Engineering 61, no. 5 (September 1, 2010): 277–81. http://dx.doi.org/10.2478/v10187-010-0040-5.

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Steady State and Dynamic Evaluation of Electrical Shaft System In this paper a steady state and dynamic assessment of electrical shaft with common resistance are performed. New steady state formulae that take into account the stator resistances are developed. The system is presented in a full version similar to individual induction machine in the dq frame but without stator resistance simplifications. It is found that the stator resistance is worth-taking into account.

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29

Rasheduzzaman, Md, Jacob A. Mueller, and Jonathan W. Kimball. "An Accurate Small-Signal Model of Inverter- Dominated Islanded Microgrids Using $dq$ Reference Frame." IEEE Journal of Emerging and Selected Topics in Power Electronics 2, no. 4 (December 2014): 1070–80. http://dx.doi.org/10.1109/jestpe.2014.2338131.

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30

Wang, Xiang, Zhengyou He, and Jianwei Yang. "Electric Vehicle Fast-Charging Station Unified Modeling and Stability Analysis in the dq Frame." Energies 11, no. 5 (May 8, 2018): 1195. http://dx.doi.org/10.3390/en11051195.

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31

Lee, Sangmin, and Seung-Hwan Lee. "dq Synchronous Reference Frame Model of A Series–Series Tuned Inductive Power Transfer System." IEEE Transactions on Industrial Electronics 67, no. 12 (December 2020): 10325–34. http://dx.doi.org/10.1109/tie.2019.2958307.

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32

Miao, Zheyu, Hao Tong, Xiaoguang Jin, Wenxi Yao, Zhengyu Lu, and Zhen Ma. "DQ-Frame Zero-Crossing Effect Modeling and Current Distortion Compensation Method for Vienna Rectifier." IEEE Transactions on Power Electronics 35, no. 7 (July 2020): 7612–23. http://dx.doi.org/10.1109/tpel.2019.2957540.

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33

Gong, Hong, Xiongfei Wang, and Dongsheng Yang. "DQ-Frame Impedance Measurement of Three-Phase Converters Using Time-Domain MIMO Parametric Identification." IEEE Transactions on Power Electronics 36, no. 2 (February 2021): 2131–42. http://dx.doi.org/10.1109/tpel.2020.3007852.

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Wang, Wei, and Xin Chun Shi. "A Novel Control Strategy of PWM Rectifier." Applied Mechanics and Materials 380-384 (August 2013): 290–93. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.290.

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Based on the mathematical model analysis of the three-phase voltage source PWM rectifier under abc reference frame and dq reference frame in this paper, a kind of three-phase voltage source PWM rectifier feed-forward decoupling control strategy is proposed. Dynamic response of DC bus voltage for PWM rectifier is very important, because higher response means little DC bus capacitor. An adaptive PI controller for the DC bus voltage was designed in this paper in order to improve the dynamic response. The experimental results indicate that this control method has good steady-state performance and fast dynamic response. For the reason of its simple, this control method has certain practical value.

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Qu, Wei Dong, Jian Wen Ren, and Xian Chao Liu. "Study on VSC-HVDC Connecting to Passive Network and Its Control Strategies." Advanced Materials Research 960-961 (June 2014): 1371–75. http://dx.doi.org/10.4028/www.scientific.net/amr.960-961.1371.

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The mathematical model VSC-HVDC system in dq reference frame is derived.For the VSC-HVDC system of transmitting power to passive network ,a constant DC voltage is used in the rectifier-side;a constant AC voltage controller is used in the inverter-side.Digital simulation models are set up by MATLAB/Simulink. Simulation results verify that VSC-HVDC has a independent control of active and passive power,and demonstrates superiority of transmitting active and passive power simultaneously when connecting to passive network.

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Simo, J. C., and L. Vu-Quoc. "On the Dynamics of Flexible Beams Under Large Overall Motions—The Plane Case: Part II." Journal of Applied Mechanics 53, no. 4 (December 1, 1986): 855–63. http://dx.doi.org/10.1115/1.3171871.

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The numerical treatment of the methodology proposed in Part I of this paper is considered in detail. Unlike traditional approaches, a Galerkin spatial discretization of the equations of motion, now referred to the inertial frame, yields the standard form of nonlinear structural dynamics: Mq¨ + Dq˙ + P(q) = F, with M and D constant matrices. Numerical examples that involve finite vibrations coupled with large overall motions are presented. These simulations also demonstrate the capability of the present formulation in handling multibody dynamics.

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Wen, Bo, Rolando Burgos, Dushan Boroyevich, Paolo Mattavelli, and Zhiyu Shen. "AC Stability Analysis and dq Frame Impedance Specifications in Power-Electronics-Based Distributed Power Systems." IEEE Journal of Emerging and Selected Topics in Power Electronics 5, no. 4 (December 2017): 1455–65. http://dx.doi.org/10.1109/jestpe.2017.2728640.

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Sepulveda, Cristian A., Javier A. Munoz, José R. Espinoza, Miguel E. Figueroa, and Pedro E. Melin. "All-on-Chip $dq$-Frame Based D-STATCOM Control Implementation in a Low-Cost FPGA." IEEE Transactions on Industrial Electronics 60, no. 2 (February 2013): 659–69. http://dx.doi.org/10.1109/tie.2012.2206353.

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Xie, Menxi, Huiqing Wen, Canyan Zhu, and Yong Yang. "A method to improve the transient response of dq -frame cascaded delayed-signal-cancellation PLL." Electric Power Systems Research 155 (February 2018): 121–30. http://dx.doi.org/10.1016/j.epsr.2017.10.004.

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Quintal-Palomo, Roberto Eduardo. "Analysis of Current Signals in a Partially Demagnetized Vector Controlled Interior Permanent Magnet Generator." Power Electronics and Drives 4, no. 1 (June 1, 2019): 179–90. http://dx.doi.org/10.2478/pead-2019-0012.

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AbstractThis manuscript analyzes the operation of an interior permanent magnet (IPM) machine working as a permanent magnet synchronous generator (PMSG). The partial demagnetization operation is analyzed. To obtain more accurate voltages and currents of the machine, finite element analysis (FEA) is used in co-simulation with the full converter and the converter’s control algorithm. Direct field oriented control (DFOC) shows robustness by maintaining the speed even with a 25% demagnetized PMSG. Also, an analysis of the rotating reference frame DQ signals is done to asses demagnetization.

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Yáñez-Campos, Sergio Constantino, Gustavo Cerda-Villafaña, and José Merced Lozano-García. "A Two-Grid Interline Dynamic Voltage Restorer Based on Two Three-Phase Input Matrix Converters." Applied Sciences 11, no. 2 (January 8, 2021): 561. http://dx.doi.org/10.3390/app11020561.

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Energy quality problems can cause diverse failures of sensitive equipment. Dynamic voltage restorers (DVRs) are devices that have been proposed to protect sensitive loads from voltage sag effects. However, the compensation capacity of DVRs is limited by the amount of energy stored in the restorer. One way to overcome this limitation is to use the interline DVR (IDVR) structure in which two or more DVRs connected to different feeders share a common DC-link. This paper proposes a new IDVR topology based on two three-phase input matrix converters (TTI-MC) without a capacitor in the dc-link. The TTI-MC integrates the power from two feeders and synthesizes the dc-link voltage. The inverters take the dc-link voltage and generate the appropriate compensation voltages to keep the load voltages stable. Each one of the inverters has its own modulation algorithm which are synchronized with the TTI-MC control. Inverter control is carried out in the reference frame dq and a modified space vector pulse width modulation (MSV-PWM) technique is used. TTI-MC control is performed in the dq reference frame with proportional-integral controllers and the modulation is based on the carrier-based pulse width modulation (MCB-PWM) technique. The proposed Two Input Interline DVR (TI-IDVR) extends its compensation range and has multifunctional capabilities. The efficiency of the proposed TI-IDVR is corroborated by simulations on MATLAB/Simulink.

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Yáñez-Campos, Sergio Constantino, Gustavo Cerda-Villafaña, and José Merced Lozano-García. "A Two-Grid Interline Dynamic Voltage Restorer Based on Two Three-Phase Input Matrix Converters." Applied Sciences 11, no. 2 (January 8, 2021): 561. http://dx.doi.org/10.3390/app11020561.

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Energy quality problems can cause diverse failures of sensitive equipment. Dynamic voltage restorers (DVRs) are devices that have been proposed to protect sensitive loads from voltage sag effects. However, the compensation capacity of DVRs is limited by the amount of energy stored in the restorer. One way to overcome this limitation is to use the interline DVR (IDVR) structure in which two or more DVRs connected to different feeders share a common DC-link. This paper proposes a new IDVR topology based on two three-phase input matrix converters (TTI-MC) without a capacitor in the dc-link. The TTI-MC integrates the power from two feeders and synthesizes the dc-link voltage. The inverters take the dc-link voltage and generate the appropriate compensation voltages to keep the load voltages stable. Each one of the inverters has its own modulation algorithm which are synchronized with the TTI-MC control. Inverter control is carried out in the reference frame dq and a modified space vector pulse width modulation (MSV-PWM) technique is used. TTI-MC control is performed in the dq reference frame with proportional-integral controllers and the modulation is based on the carrier-based pulse width modulation (MCB-PWM) technique. The proposed Two Input Interline DVR (TI-IDVR) extends its compensation range and has multifunctional capabilities. The efficiency of the proposed TI-IDVR is corroborated by simulations on MATLAB/Simulink.

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43

Boussoufa, Ahmad, Madjid Kidouche, and Aimad Ahriche. "Rotor Speed and Flux Estimation of a Doubly-fed Induction Machine Using Extended Kalman Filter." Algerian Journal of Signals and Systems 2, no. 4 (December 15, 2017): 266–73. http://dx.doi.org/10.51485/ajss.v2i4.52.

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This paper uses Extended Kalman Filtering method (EKF) to estimate the rotor speed and flux of a Doubly-fed Induction Generator (DFIG) to be used in Wind Turbines (WTs). DFIGs are widely used in WTs because they can generate an electric power of constant voltage amplitude and frequency which allow a direct connection between the WTs and the ac power network. A DFIG modeling in the (dq) reference frame is presented and a brief description of EKF algorithm is described to estimate the rotor speed and flux. Simulations results are shown and discussed.

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Rao, Cheng Cheng, Hai Yun Wang, and Wei Qing Wang. "Improvement of Stable Operation Ability for Large-Scale Wind Power System Based on VSC-HVDC Technology." Applied Mechanics and Materials 599-601 (August 2014): 960–63. http://dx.doi.org/10.4028/www.scientific.net/amm.599-601.960.

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Rigorous transmission technology is important when large-scale wind farm is connected to the power grid. Hence, a power transmission topological framework based on VSC-HVDC is proposed. The mathematical model is built in the dq synchronous frame, and the related direct current control strategy of VSC converters are designed. The doubly fed induction generator wind farm with VSC-HVDC system are modelled in DIgSILENT/PowerFactory. Ultimately, the conditions of the short-circuit fault at the receiving-end VSC AC bus is simulated. The control scheme is proved to be effective.

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Nguyen, Huy Minh, Phuong Minh Le, and Phuong Thanh Ho. "Applying Kalman filter on sensor noise cancelation in grid – connected inverter." Science and Technology Development Journal 18, no. 3 (August 30, 2015): 192–98. http://dx.doi.org/10.32508/stdj.v18i3.901.

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This paper presents the control model of three phase grid- connected photovoltaic inverter based on the analysis of operating principle of two-stage conventional gridconnected inverter. The mathematical model of inverter under dq frame is set up and the overall control strategy of two-stage photovoltaic grid-connected inverter is proposed in this paper. To overcome the distortion general caused by switching effect on sensors, a Kalman filter is introduced. The control strategy was simulated on Matlab – Simulink to verify the steady and dynamic of model, improving the quality of electrical power to consumers.

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Yang, Yong, Chun Qing Qi, Ji Suo, and Feng Wen Cao. "Singe-Phase Grid-Connected Inverter Based on Voltage-Oriented Control in Photovoltaic Generation Systems." Advanced Materials Research 765-767 (September 2013): 2498–502. http://dx.doi.org/10.4028/www.scientific.net/amr.765-767.2498.

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The paper proposes a new control of a transformerless singe-stage single-phase grid-connected inverter in photovoltaic generation systems. The control scheme is mainly based on voltage-oriented control (VOC) with help of second order Generalized Integrator (SOGI). A cascaded control structure with an outer dc link voltage control loop and an inner current control loop is used. The currents are controlled in a synchronous dq reference frame using a decoupled feedback control. The simulated results have proven an excellent performance and verified the validity of proposed system.

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Gaiceanu, Marian. "Linear Quadratic Regulator for the Three-Phase Grid Connected Power Converter." Advanced Materials Research 677 (March 2013): 472–75. http://dx.doi.org/10.4028/www.scientific.net/amr.677.472.

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This paper proposes a combined power quality-optimal control of the three-phase grid connected power converter. By using the technique of decoupling control, the mathematical model of the three-phase power converter is developed in the dq rotating reference frame and it is linearized around the operating point. The optimal control problem is with free-end point, infinite time horizon, and without constraints. The proposed optimal control is obtained as a solution of the Algebraic Riccati Equation. The numerical simulations based on the Matlab/Simulink software show the validity of the proposed solution.

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48

Setiyono and Bambang Dwinanto. "REDUKSI HARMONISA MENGGUNAKAN TAPIS DAYA AKTIF BERBASIS SYNCHROUNOUS REFERENCE FRAME DQ PADA SISTEM DAYA TIGA FASA." Jurnal Ilmiah Teknologi dan Rekayasa 26, no. 1 (2021): 13–24. http://dx.doi.org/10.35760/tr.2021.v26i1.3604.

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Mutu listrik yang bagus memiliki ciri berbentuk sinusoida, kontinu, dan handal terhadap gangguan. Penggunaan perangkat elektronika daya dapat menurunkan kualitas sistem tenaga. Penyebabnya adalah arus harmonisa pada sisi beban mengintervensi arus listrik pada sisi sumber pasokan daya. Arus harmonisa ini menjadi masalah utama dalam sistem distribusi listrik sehingga diperlukan langkah antisipasi untuk meredam kehadiran harmonisa di dalam sistem tenaga. Penelitian ini bertujuan menyajikan tapis daya aktif paralel untuk menurunkan Total harmonic Distortion (THD) pada sistem tenaga listrik melalui sebuah pemodelan simulasi. Beberapa peneliti telah melakukan riset dengan hasil yang masih bervariasi dalam menurunkan THD, dan pada umumnya nilai THD yang diperoleh berkisar pada nilai 5%. Pada penelitian ini, untuk menurunkan THD secara teknis adalah dengan menyuntikan arus kompensasi ke jala menggunakan metode synchronous d-q reference. Bentuk gelombang arus kompensasi ini dibuat sama dengan arus harmonisa beban namun berbeda fasa 1800. Histerisis Current Control digunakan untuk membangun pulsa penyalaan rangkaian Voltage Spurce Inverter. Pemodelan sistem tapis daya aktif paralel dibangun menggunakan tools Matlab Simulink. Hasil simulasi memperlihatkan nilai indeks THD sebelum diinjeksi sebesar 30,67%, dan setelah diinjeksi turun menjadi 2,37%. Nilai THD ini sesuai dengan standar IEEE 519 sehingga dapat disimpulkan bahwa pemodelan ini layak dibangun untuk di implementasikan pada sebuah sistem tenaga.

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Golestan, Saeed, Esmaeil Ebrahimzadeh, Bo Wen, Josep M. Guerrero, and Juan C. Vasquez. "dq-Frame Impedance Modeling of Three-Phase Grid-Tied Voltage Source Converters Equipped With Advanced PLLs." IEEE Transactions on Power Electronics 36, no. 3 (March 2021): 3524–39. http://dx.doi.org/10.1109/tpel.2020.3017387.

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Lin, Weixing, and Dragan Jovcic. "Dynamic modelling of VSCs in a dq rotating frame for pole-to-pole dc fault study." IET Generation, Transmission & Distribution 11, no. 4 (March 9, 2017): 1072–81. http://dx.doi.org/10.1049/iet-gtd.2015.0877.

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