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Journal articles on the topic 'DQ control method'

Author: Grafiati

Published: 4 June 2021

Last updated: 14 February 2022

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1

Cao, Yan Ling, Ping Cao, and Yan Dong Wen. "Inductance Measurement for PMSM Using Instantaneous Flux Linkage Method." Applied Mechanics and Materials 685 (October 2014): 393–96. http://dx.doi.org/10.4028/www.scientific.net/amm.685.393.

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The dq-axis inductances are important for the voltage decoupling control, torque estimation and steady-state performance analysis of a PMSM machine. In this paper, a measurement method is proposed based on the dq-axis instantaneous flux linkages calculation. The rotor is locked by a positive d-axis current, and then a proper AC current is assigned respectively to the d and q-axis reference current in order to cover the various current ranges. The instantaneous flux linkages are calculated by the integration of dq-axis current and voltage offline. Finally, dq-axis inductances are computed by th

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2

Son, Dong-Kyun, Soon-Ho Kwon, Dong-Ok Kim, Hee-Sue Song, and Geun-Ho Lee. "Control Comparison for the Coordinate Transformation of an Asymmetric Dual Three Phase Synchronous Motor in Healthy and Single-Phase Open Fault States." Energies 14, no. 6 (2021): 1735. http://dx.doi.org/10.3390/en14061735.

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The coordinate transformation method of asymmetric dual three phase synchronous motor (ADTP-SM) is a Double dq transform using two dq-axes and a vector space decomposition (VSD) model method using the orthogonality of ADTP-SM. There are several studies comparing the two methods in a healthy state, but few in a single-phase open fault state. In the healthy, when the VSD model is applied, different harmonic orders of the phase current are projected onto the dq and xy-axes (the axis for controlling harmonics of the phase current), and the two-axes are orthogonal, so it can be controlled stably. I

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3

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 (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

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4

Liu, Fang, Haotian Li, Ling Liu, Runmin Zou, and Kangzhi Liu. "A Control Method for IPMSM Based on Active Disturbance Rejection Control and Model Predictive Control." Mathematics 9, no. 7 (2021): 760. http://dx.doi.org/10.3390/math9070760.

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In this paper, the speed tracking problem of the interior permanent magnet synchronous motor (IPMSM) of an electric vehicle is studied. A cascade speed control strategy based on active disturbance rejection control (ADRC) and a current control strategy based on improved duty cycle finite control set model predictive control (FCSMPC) are proposed, both of which can reduce torque ripple and current ripple as well as the computational burden. First of all, in the linearization process, some nonlinear terms are added into the control signal for voltage compensation, which can reduce the order of t

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5

Li, Qiao, Dong Jiang, Yechi Zhang, and Zicheng Liu. "The Impact of VSFPWM on DQ Current Control and a Compensation Method." IEEE Transactions on Power Electronics 36, no. 3 (2021): 3563–72. http://dx.doi.org/10.1109/tpel.2020.3017776.

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6

Wang, Yu Feng, Guang Ye Liu, Xiao Guo Lv, and Zhong Chu Wang. "The Simulation of APF Based on Three-Phase VSI." Applied Mechanics and Materials 397-400 (September 2013): 1901–5. http://dx.doi.org/10.4028/www.scientific.net/amm.397-400.1901.

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In order to restrain harmonic pollution of power grid, the structure and control strategy of APF was researched. The structural parameters and method of direct current control of the most widely used APF with three-phase VSI was discussed. Decoupling control of active and reactive current on the dq plane was realized by dq transforming. Harmonic of load current was detected by Ip-Iq algorithm based on the instantaneous reactive power theory. Double closed-loop control was applied and PWM drive signals of IGBT were got through comparison of triangle wave and modulation wave. The simulation resu

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7

Kang, Wei, Li Xia Zhang, and Zhen Lei. "Double Closed-Loop Control System of Bi-Direction Current Source Inverter." Advanced Materials Research 204-210 (February 2011): 699–703. http://dx.doi.org/10.4028/www.scientific.net/amr.204-210.699.

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The double closed-loop control system of current source SPWM inverter (CSI) is designed to meet the need of battery pack testing system. The battery pack has tiny inner resistance, back electromotive force and it acted as a comparative load which made the control system hard to design. The control system aimed at the specialty of the battery pack load and put forward a loop-locked control method based on dq coordinate conversion of CSI. Typical I and II control system is adopted to get a better performance. It increases the transform efficiency by SPWM and gets high power factor and high dynam

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8

Otkun, Özcan, R. Özgür Doğan, and A. Sefa Akpinar. "Performance Analysis of Linear Permanent Magnets Synchronous Motor by Scalar Control Method (v/f)." Applied Mechanics and Materials 666 (October 2014): 199–202. http://dx.doi.org/10.4028/www.scientific.net/amm.666.199.

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This study is conducted to improve the performance of Linear Permanent Magnet Synchronous Motor by using Scalar Control Method. To do this, open and closed loop control methods are used. The study is modeled with MATLAB / SIMULINK. Firstly, the Simulink model has been developed by using equations dq axis system of the motor. Then, a scalar control method is modeled. Thirdly, open and closed loop control forms are modeled. From these models, current, thrust force, and speed graphs were obtained. It is seen on the graphs, the motor's closed loop PID control at scalar control method provide posit

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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 (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 prop

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10

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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11

Kakosimos, Panagiotis, Minos Beniakar, Athanasios G. Sarigiannidis, and Antonios G. Kladas. "Model Predictive Control Employing Finite-Element Methods for Aerospace Actuators." Materials Science Forum 856 (May 2016): 202–6. http://dx.doi.org/10.4028/www.scientific.net/msf.856.202.

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In this paper the strategy of the extraction of an advanced simulation model of interior permanent magnet synchronous machine is suggested in order to be employed by Model Predictive Control schemes. The conventional dq-axis mathematical model is modified in order to include data derived from finite element analysis (FEA). Indirect interaction between FEA and circuit simulation enhances model fidelity embodying the influence of saturation and cross-coupling effects. The proposed method of developing a detailed simulation model opens new prospects on the control of electrical machines.

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12

Kato, Masayuki, and Katsuhiro Hirata. "Control of three-degree-of-freedom resonant actuator driven by novel vector control." Transportation Systems and Technology 4, no. 3 (2018): 90–101. http://dx.doi.org/10.17816/transsyst20184390-101.

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This paper presents a novel vector control method for three-degree-of-freedom resonant actuator in order to improve its controllability. The effectiveness of the presented method is verified through electromagnetic field analysis using 3-D finite element method: Issue: A three-degree-of-freedom resonant actuator has a great potential to broaden the application range of linear oscillatory actuators because it has a lot of advantages: high efficiency, simple structure, etc. However, this actuator has low controllability because the magnetic structure of each axis is not independent.

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13

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

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14

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 (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 effectiv

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15

Chen, Li, Qiu, and Liu. "Control Strategy of Three-Phase Inverter with Isolation Transformer." Energies 12, no. 20 (2019): 4005. http://dx.doi.org/10.3390/en12204005.

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In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller

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16

Tian, Xu, Yue Ma, Jintao Yu, Cong Wang, and Hong Cheng. "A Modified One-Cycle-Control Method for Modular Multilevel Converters." Energies 12, no. 1 (2019): 157. http://dx.doi.org/10.3390/en12010157.

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In this paper, a new One-Cycle-Control (OCC) method is designed for a modular multilevel converter (MMC) based on the principle of the equivalent resistance constant. The proposed controller has a simple structure and a small amount of calculation by cancelling the current inner loop proportional integral (PI) controller and the inverse transform in the traditional direct-quadrature (DQ) control. Compared to the traditional OCC controller, the new one separates the control method from the modulation strategy, making it possible to use not only carrier-based pulse-width modulation (PWM), but al

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17

Li, Yi Ming, and Jun Rong. "The Simulation Study of Asynchronous Motor Based on dq Coordinate System." Applied Mechanics and Materials 441 (December 2013): 484–87. http://dx.doi.org/10.4028/www.scientific.net/amm.441.484.

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With the improvement of modem science and technology, asynchronous motor plays more and more important role in modem industrial life, and asynchronous motor has the broadest application and requirement in all kind of motors. The paper firstly builds the mathematical model of asynchronous motor in dq coordinate system, then establishes the simulation models of asynchronous motor based on Matlab/Simulink. The last the paper gives the simulation results and analyzes the simulation results. The results prove that the theoretical analysis of asynchronous motor in dq coordinate system is correct com

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18

Slota, Ján, Miroslav Jurčišin, Ivan Gajdoš, and Emil Spišák. "THE SENSITIVITY OF A PHOTOGRAMMETRIC METHOD IN FORMABILITY ANALYSIS." Acta Mechanica et Automatica 7, no. 2 (2013): 117–23. http://dx.doi.org/10.2478/ama-2013-0021.

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Abstract Nowadays is a possible to implement numerical simulation and photogrammetric inspection to the complex process chain of inspection. In the recent years there has been significant progress in accuracy improving of these methods of inspection in pre-production or post-production stage of manufacturing. This article discusses these two methods from sensitivity and comparison point of view. Most attention has been paid to the photogrammetric method and his sensitivity to using different approaches. Results were compared with the result of numerical simulation and experiment. Numerical sim

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19

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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20

Shi, Xin Chun, Wei Zhang, and Pei Ran Liu. "Study on SVG Simulation with the Voltage and Current Dual Closed-Loop PWM Control Strategy." Advanced Materials Research 732-733 (August 2013): 1265–70. http://dx.doi.org/10.4028/www.scientific.net/amr.732-733.1265.

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This paper first introduced the SVG main circuit and the basic principles of SVG, then finished SVG modeling in dq coordinate process. Then an SVG direct current control method was proposed as well. Considering stability requirement to the DC side voltage, the paper designed voltage and current dual closed-loop PWM control system. Finally, SVG system was simulated using the Matlab/simulink. Results show that SVG has a good dynamic performance, verifying the correctness and validity of the dual closed-loop control.

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21

Shan, Yongpan, Lidong Cao, Chunli Xu, et al. "Sulfonate-Functionalized Mesoporous Silica Nanoparticles as Carriers for Controlled Herbicide Diquat Dibromide Release through Electrostatic Interaction." International Journal of Molecular Sciences 20, no. 6 (2019): 1330. http://dx.doi.org/10.3390/ijms20061330.

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Environmental stimuli-responsive pesticide release is desirable for enhanced efficiency and reduced side effects. In most cases, the loading and release of pesticides mainly depends on hydrophobic interactions and hydrogen bonding. Electrostatic interaction is less investigated as a weapon for achieving high loading content and controlled pesticide release. In this work, negative-charge decorated mesoporous silica nanoparticles (MSNs) were facilely fabricated by introducing sulfonate groups onto MSNs through a post-grafting method. Sulfonate-functionalized MSNs (MSN-SO3) were synthesized by co

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22

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 ripp

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23

Li, Feng Lin, Shu Ju Hu, and Ling Ling Wang. "Control of Quasi-Z Source Inverter with Super Capacitor under Unbalanced Grid Fault Conditions." Applied Mechanics and Materials 291-294 (February 2013): 2124–31. http://dx.doi.org/10.4028/www.scientific.net/amm.291-294.2124.

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The quasi-Z-source inverter (qZSI) has some unique advantages and is suitable for renewable energy sources such as solar and wind generation system. In order to make the inverter have the ride-through ability and the current into the grid symmetrical when unbalanced grid faults occur, the topology of qZSI with super capacitor substituting the low voltage capacitor and the unbalance control strategy were proposed. With a super capacitor the system can balance and smooth the power between the generation unit and grid, also the current injected into the grid can be symmetrical through the unbalan

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24

Ogut, Elif. "Magnetohydrodynamic mixed convection in a lid-driven rectangular enclosure partially heated at the bottom and cooled at the top." Thermal Science 21, no. 2 (2017): 863–74. http://dx.doi.org/10.2298/tsci141121053o.

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In the present study, numerical simulation of magnetohydrodynamic (MHD) mixed convection heat transfer and fluid flow has been analyzed in a lid-driven enclosure provided with a constant flux heater. Governing equations were solved via differential quadrature (DQ) method. Moving wall of the enclosure has constant temperature and speed. The calculations were performed for different Richardson number ranging from 0.1 to 10, constant heat flux heater length from 0.2 to 0.8, location of heater center from 0.1 to 0.9, Hartmann number from 0 to 100 and aspect ratio from 0.5 to 2. Two different magne

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25

Zhao, Feng Jiao, Jiu He Wang, and Bai Le Zhang. "Research on the PCHD Control Strategy for Three-Phase Voltage Source PWM Rectifier under Unbalanced Supply Voltage Condition." Applied Mechanics and Materials 571-572 (June 2014): 959–64. http://dx.doi.org/10.4028/www.scientific.net/amm.571-572.959.

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In order to improve the performance of the rectifier under unbalanced voltage condition, this paper adopts port-controlled Hamiltonian dissipation (PCHD) control strategy. On the basic of the mathematical model of the three-phase voltage source PWM rectifier, its PCHD model in synchronous dq coordinates was established by orthogonal transformation. The desired equilibrium point of the system was obtained according to the target of the design. The controller was designed with the method of interconnection and damping assignment, and the PI control method was introduced to restrain the steady-st

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26

Dawood, Suroor, Samar Majeed, and Habeeb Nekad. "PID Controller Based Multiple (Master/Slaves) Permanent Magnet Synchronous Motors Speed Control." Iraqi Journal for Electrical and Electronic Engineering 11, no. 2 (2011): 183–92. http://dx.doi.org/10.37917/ijeee.11.2.5.

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This paper suggests the use of the traditional proportional-integral-derivative (PID) controller to control the speed of multi Permanent Magnet Synchronous Motors (PMSMs). The PMSMs are commonly used in industrial applications due to their high steady state torque, high power, high efficiency, low inertia and simple control of their drives compared to the other motors drives. In the present study a mathematical model of three phase four poles PMSM is given and simulated. The closed loop speed control for this type of motors with voltage source inverter and abc to dq blocks are designed. The mu

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27

Mao, Jing Feng, Guo Qing Wu, Ai Hua Wu, Xu Dong Zhang, and Kun Yang. "Modeling and Decoupling Control of Grid-Connected Voltage Source Inverter for Wind Energy Applications." Advanced Materials Research 213 (February 2011): 369–73. http://dx.doi.org/10.4028/www.scientific.net/amr.213.369.

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This paper investigates the modeling and decoupling control of grid-connected voltage source inverter (GC-VSI) for wind energy conversion system (WECS) applications. Firstly, the typical configuration and operation principle of the direct-driven grid-connected WECS are analyzed. Then, by means of input-output modeling method and instantaneous active power theory, a time domain mathematical model of the GC-VSI is set up. Besides, in order to resolve the GC-VSI active current and reactive current cross-coupling nonlinear control problem, a vector decoupling control method for the GC-VSI firing p

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28

Wen, Quan, and Ling Zhu. "Study of PWM Voltage Source Rectifier Based on Predictive Current Control Strategy." Applied Mechanics and Materials 380-384 (August 2013): 3069–72. http://dx.doi.org/10.4028/www.scientific.net/amm.380-384.3069.

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Traditional current strategy based on dq transformation used in three-phase PWM voltage source rectifier (VSR) has some shortcomings, such as dynamic response slow and DC voltage fluctuation. According to the problems, firstly this paper established discrete mathematical model of VSR, derived predictive current control strategies for VSR. Secondly, design a dual-closed-loop controller with current inner loop and voltage outer loop for the system. Finally, experimental researches are done. The results show that the three-phase PWM voltage source rectifier based on predictive current control in

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29

Yu, Fei, and Yongchao Zhou. "A Novel Vector Control of Five-phase PMSM Based on Harmonic Current Closed Loop." MATEC Web of Conferences 232 (2018): 04015. http://dx.doi.org/10.1051/matecconf/201823204015.

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Multi-phase electric machines such as five-phase permanent magnet synchronous motor (PMSM) play an important role in the ships electrical propulsion because of the advantages of high performance and high reliability. The decoupled mathematic models of five-phase PMSM in dq coordinate frame are established, and the reason caused to high stator harmonic current in the multi-phase motor is analyzed based on the mathematic models. To suppress the harmonic current, a novel vector control (VC) method based on SVPWM and harmonic current closed loop control is proposed. Based on the proposed algorithm

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30

Shi, Rui, Tai Li, and Ling Kai Kong. "The Vector Control of PMSM Based on the Inverse System Theory." Applied Mechanics and Materials 494-495 (February 2014): 1587–90. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1587.

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Against the existing poor dynamic performance, difficult to adjusting parameters of the controllers issue in PMSMs vector control system, based on the PMSM's dq rotating coordinate model, an inverse system model of PMSM is deduced. And a pseudo linear system realizing the decoupling of the d-axis current and mechanical velocity is constructed. By synthesizing the pseudo linear system, a sliding mode variable structure controller is proposed. In order to estimate rotor's position and speed, a reduced order observer for back electromotive force is proposed. At last some simulations are proceeded

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Zhang, Xinlin, Yanchi Zhang, Da Xie, and Bowen Zhao. "Study of start-up decoupling controller for modular multilevel converter." E3S Web of Conferences 261 (2021): 01026. http://dx.doi.org/10.1051/e3sconf/202126101026.

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Modular multilevel converters are widely used in power systems because of their significant advantages. In this paper, a dynamic mathematical model is established by analyzing the topology, operating principle and switching function of the modular multilevel converter, so as to construct an inner and outer loop decoupling controller in dq coordinates. The carrier phase-shift pulse-width modulation is selected to control the sub-module operation, and the uncontrolled pre-charging method is adopted to charge the sub-module. Finally, simulation experiments are carried out in MATLAB/Simulink, and

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Zhou, Sizhan, Jinjun Liu, Linyuan Zhou, and Yan Zhang. "DQ Current Control of Voltage Source Converters With a Decoupling Method Based on Preprocessed Reference Current Feed-forward." IEEE Transactions on Power Electronics 32, no. 11 (2017): 8904–21. http://dx.doi.org/10.1109/tpel.2017.2651139.

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Palka, Ryszard, and Rafal Piotuch. "Usage of FEM for synthesis of dead-beat current controller for permanent magnet synchronous motor." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 38, no. 5 (2019): 1386–400. http://dx.doi.org/10.1108/compel-12-2018-0534.

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Purpose Predictive controllers and permanent magnet synchronous motors (PMSMs) got more attention over the past decades thanks to their applicable features. This paper aims to propose and verify a method to design a predictive current controller with consideration of motor characteristics obtained from finite element analysis (FEA). Design/methodology/approach Permanent magnet motor parameters and its maps can be calculated by means of FEA. The model takes into account magnetic saturation and thermal electro-magnetic properties. For each dq current vector and each position, self and mutual ind

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34

Dehghani, Seyed Mohsen, Naqi Dara, Behrooz Gharesifar, Iraj Shahramian, Fatemeh Dalili, and Morteza Salarzaei. "Prevalence of HLA DQ 2, 8 in children with celiac disease." Human Antibodies 29, no. 2 (2021): 123–28. http://dx.doi.org/10.3233/hab-200437.

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OBJECTIVE: Celiac disease is a chronic disease that affect small bowel by making its villi become atrophic. Various environmental and genetic factors have been identify as inducing factors for celiac disease. Most of the patients has one of the HLA DQ forms. Although the prevalence of these genes are variable in different areas of the world, we do not have a comprehensive information about this issue in our region. Thus the aim of present study is to investigate the prevalence of HLA DQ typing of patients who visited Emam Reza Gastroenterology clinic of Shiraz(IRAN). METHODS: In this case-cont

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Wang, Ming Jie, and Zheng Xiang Ma. "Calculation of Steady State Parameter in Permanent Magnet Linear Synchronous Motors by Analysis Method and FEM." Advanced Materials Research 926-930 (May 2014): 860–63. http://dx.doi.org/10.4028/www.scientific.net/amr.926-930.860.

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The steady state parameters of permanent magnet linear synchronous motor (PMLSM) has an important influence on the performance of the motor. Based on a linear permanent magnet horizontal motion synchronous motor, the paper adopts multi-layered model method to give the formulas of the air-gap flux density that the permanent magnet and armature winding act on alone, no-load back electromotive force, the thrust force in steady-state operation and vector control of thrust in the dq model equation, then compute the value of these parameters according to the formulas, and the finite element method (

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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.8193.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the

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Yong, Yang. "Direct Instantaneous Power Control of Three-level Grid-connected." International Journal of Electrical and Computer Engineering (IJECE) 6, no. 3 (2016): 1260. http://dx.doi.org/10.11591/ijece.v6i3.pp1260-1273.

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Power electronic grid-connected inverters are widely applied as grid interface in renewable energy sources. This paper presents direct instantaneous power control of a three-phase three-level Neutral Point Clamped (NPC) grid-connected inverter in photovoltaic generation systems. The system consists of a PV array, DC/DC converter, three-level NPC LC filter and the grid. In order to achieve maximum power point tracking (MPPT), an adaptive perturb and observe MPPT is used. For balancing the neutral point (NP) voltage, the control scheme through proportional integral (PI) control according to the

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SELLESKI, Nicole, Lucas Malta ALMEIDA, Fernanda Coutinho de ALMEIDA, Lenora GANDOLFI, Riccardo PRATESI, and Yanna Karla de Medeiros NÓBREGA. "SIMPLIFYING CELIAC DISEASE PREDISPOSING HLA-DQ ALLELES DETERMINATION BY THE REAL TIME PCR METHOD." Arquivos de Gastroenterologia 52, no. 2 (2015): 143–46. http://dx.doi.org/10.1590/s0004-28032015000200013.

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Background Celiac disease is an autoimmune enteropathy triggered by the ingestion of gluten in genetically susceptible individuals. Genetic susceptibility is associated with two sets of alleles, DQA1*05 - DQB1*02 and DQA1*03 - DQB1*03:02, which code for class II MHC DQ2 and DQ8 molecules, respectively. Approximately 90%-95% of celiac patients are HLA-DQ2 positive, and half of the remaining patients are HLA-DQ8 positive. In fact, during a celiac disease diagnostic workup, the absence of these specific DQA and DQB alleles has a near perfect negative predictive value. Objective Improve the detect

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Shi, Yifeng, Xiangjian Shi, Chuanbao Yi, Xufeng Song, and Xiaogang Chen. "Control of the Variable-Speed Pumped Storage Unit-Wind Integrated System." Mathematical Problems in Engineering 2020 (March 29, 2020): 1–9. http://dx.doi.org/10.1155/2020/3816752.

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The integration of variable-speed pumped storage unit (VS-PSU) guarantees an efficient peak regulation and frequency modulation of the power grid. The present research analyzes the active power flow of the VS-PSU under synchronous, subsynchronous, and supersynchronous speed in both generation and pumping modes. The control strategy of the VS-PSU is realized by the dq-axis vector control method. Furthermore, the control of the VS-PSU integrated with wind power has been conducted using DIgSILENT platform with the VS-PSU of 300 kW capacity. Results show that the fluctuation of the power output of

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Zakieldeen, Elhassan, Yi Tang, and Yang Li. "Proposed Control Method of Doubly Fed Induction Generator Rotor Side Converter Based on System Frequency Regulation." Applied Mechanics and Materials 548-549 (April 2014): 806–14. http://dx.doi.org/10.4028/www.scientific.net/amm.548-549.806.

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With the more penetration of wind power based on the DFIG wind turbine to the grid, there is increasing significance for controlling output power in order to meet power system requirements and to participate the frequency regulation in the power grid. This paper is presented proposed control method of DFIG implemented in the RSC using system frequency coordinated control. In this study, the GSC is controlled by using modified vector control method while the RSC is controlled by adjusting the rotor dq-axis currents. The quadrature axis current controls by using the active power generating from

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Li, Chuanyue, Taoufik Qoria, Frederic Colas, et al. "Coupling Influence on the dq Impedance Stability Analysis for the Three-Phase Grid-Connected Inverter." Energies 12, no. 19 (2019): 3676. http://dx.doi.org/10.3390/en12193676.

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The dq impedance stability analysis for a grid-connected current-control inverter is based on the impedance ratio matrix. However, the coupled matrix brings difficulties in deriving its eigenvalues for the analysis based on the general Nyquist criterion. If the couplings are ignored for simplification, unacceptable errors will be present in the analysis. In this paper, the influence of the couplings on the dq impedance stability analysis is studied. To take the couplings into account simply, the determinant-based impedance stability analysis is used. The mechanism between the determinant of th

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Ni, Yi Feng, and Yong Qiang Zhu. "Dual-Current Loops Control Strategy of PWM Rectifier under Unbalanced Grid Voltage Conditions." Applied Mechanics and Materials 556-562 (May 2014): 2114–18. http://dx.doi.org/10.4028/www.scientific.net/amm.556-562.2114.

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The unbalanced grid voltage causes the current harmonics, the fluctuation of the active power in AC side and the fluctuation of the DC voltage. The dual-current loops control strategy can slove those problems. The positive and negative sequence components of grid voltages and currents were calculated based on the symmetrical component method and were used to calculate the instantaneous power in double dq rotate coordinate, which ratate at positive and negative synchronous angular velocity respectively. The dual-current loops control strategy was finally verified in simulation by comparing with

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Yang, Ling, Yandong Chen, An Luo, and Kunshan Huai. "Admittance Reshaping Control Methods to Mitigate the Interactions between Inverters and Grid." Energies 12, no. 13 (2019): 2457. http://dx.doi.org/10.3390/en12132457.

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With the increasing impedance coupling between inverters and grid caused by the phase-locked loop (PLL), traditional three-phase inverters suffer from the harmonic distortion or instability problems under weak grid conditions. Therefore, the admittance reshaping control methods are proposed to mitigate the interactions between inverters and grid. Firstly, a dynamics model of traditional inverter output admittance including main circuit and PLL is developed in the direct-quadrature (dq) frame. And the qq channel impedance of the inverter presents as a negative incremental resistance with the PL

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Gkavanoudis, Spyros I., Konstantinos O. Oureilidis, Georgios C. Kryonidis, and Charis S. Demoulias. "A Control Method for Balancing the SoC of Distributed Batteries in Islanded Converter-Interfaced Microgrids." Advances in Power Electronics 2016 (June 14, 2016): 1–11. http://dx.doi.org/10.1155/2016/8518769.

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In a low-voltage islanded microgrid powered by renewable energy sources, the energy storage systems (ESSs) are considered necessary, in order to maintain the power balance. Since a microgrid can be composed of several distributed ESSs (DESSs), a coordinated control of their state-of-charge (SoC) should be implemented, ensuring the prolonged lifespan. This paper proposes a new decentralized control method for balancing the SoC of DESSs in islanded microgrids, without physical communication. Each DESS injects a current distortion at 175 Hz, when its SoC changes by 10%. This distortion is recogni

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Tang, Peng, Yuehong Dai, and Zhaoyang Li. "Unified Predictive Current Control of PMSMs with Parameter Uncertainty." Electronics 8, no. 12 (2019): 1534. http://dx.doi.org/10.3390/electronics8121534.

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Predictive current control (PCC) applied on permanent magnet synchronous motors (PMSMs) has been developed into mainly three methods: the conventional finite-control-set PCC, the double voltage vectors PCC, and deadbeat PCC. However, each approach has its particular calculation way for voltage vectors selection and respective execution duration. This paper, based on the deadbeat idea, presents a unified predictive current control scheme of PMSMs. Under this scheme, the prior three classes are able to be clearly unified into one frame with lower calculation effort. Furthermore, to cope with pro

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Krishna, Remya, Deepak E. Soman, Sasi K. Kottayil, and Mats Leijon. "Synchronous Current Compensator for a Self-Balanced Three-Level Neutral Point Clamped Inverter." Advances in Power Electronics 2014 (April 29, 2014): 1–8. http://dx.doi.org/10.1155/2014/620607.

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This paper presents a synchronous current control method for a three-level neutral point clamped inverter. Synchronous reference frame control based on two decoupled proportional-integral (PI) controllers is used to control the current in direct and quadrature axes. A phase disposition pulse width modulation (PDPWM) method in regular symmetrical sampling is used for generating the inverter switching signals. To eliminate the harmonic content with no phase errors, two first-order low pass filters (LPFs) are used for the dq currents. The simulation of closed-loop control is done in Matlab/Simuli

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Choeung, Chivon, Meng Leang Kry, and Young Il Lee. "Robust Tracking Control of a Three-Phase Charger under Unbalanced Grid Conditions." Energies 11, no. 12 (2018): 3389. http://dx.doi.org/10.3390/en11123389.

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This paper presents a robust control technique for three-phase chargers under unbalanced grid conditions. The control method consists of inner-loop robust grid-current control and outer-loop proportional integral control for constant current (CC) and constant voltage (CV) control. A dual-current control for the inner-loop positive and negative sequence is employed to eliminate the unbalanced current caused by the grid so that a constant current and voltage can be provided to the batteries. The inner-loop robust controllers utilize state feedback with integral action in the dq-synchronous frame

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Wrona, Grzegorz, and Marek Jasinski. "AC-DC Converter with Asymmetrical Higher Harmonics Compensation Function in Sustainable AC Grid." Electrical, Control and Communication Engineering 2, no. 1 (2013): 5–13. http://dx.doi.org/10.2478/ecce-2013-0001.

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AbstractIn this paper the grid current higher harmonic compensation method for two level AC-DC converters in sustainable AC grid is described. The algorithm is based on Direct Power Control with Space Vector Modulator (DPC-SVM), which was extended by additional Higher Harmonics Compensation (HHC) module. The HHC block is composed of several resonant filters tuned to appropriate frequencies. Both, symmetrical and asymmetrical types of grid currents distortions are analyzed. Operation of the HHC module in stationary αβ coordinates and rotating dq coordinates is discussed. Selected waveforms illu

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Yang, Ting, Takahiro Kawaguchi, Seiji Hashimoto, and Wei Jiang. "Switching Sequence Model Predictive Direct Torque Control of IPMSMs for EVs in Switch Open-Circuit Fault-Tolerant Mode." Energies 13, no. 21 (2020): 5593. http://dx.doi.org/10.3390/en13215593.

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A switching sequence model predictive direct torque control (MPDTC) of IPMSMs for EVs in switch open-circuit fault-tolerant mode is studied in this paper. Instead of selecting one space vector from the possible four space vectors, the proposed MPDTC method selects an optimized switching sequence from two well-designed switching sequences, including three space vectors, according to a new designed cost function of which the control objectives have been transferred to the dq-axes components of the stator flux-linkage under the maximum-torque-per-ampere control. The calculation method of the dura

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Mu, Kun, Xiao Bin Mu, and Xue Yu Bao. "A New Nonlinear Control Strategy for DC/AC Inverter." Advanced Materials Research 466-467 (February 2012): 829–33. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.829.

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The mathematical model of Three-phase VoltagePulse Width Modulation (PWM) DC/AC inverter is non-linear, in view of the traditional linear control strategy can not meet the requirements of designing high-performance DC/AC inverter, this paper propose a new nonlinear control strategy for Three-phase Voltage PWM DC/AC inverter called Passivity-based Control. We can alter the inverter model in three-phase abc coordinate to two-phase synchronous rotating dq coordinate for establishing the Euler – Lagrange (EL) energy model for this system, then we also proof this system is strictly passive. We can

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