Статті в журналах: "Direct Flux Vector Control (DFVC)"

1

Almakki, Ali Nadhim Jbarah, and Andrey Mazalov. "Improved dfig dftc by using a fractional-order super twisting algorithms in wind power application." Modern Transportation Systems and Technologies 7, no. 3 (September 30, 2021): 131–49. http://dx.doi.org/10.17816/transsyst202173131-149.

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Background: The direct flux and torque control are a robust, simple, and alternative approach control formulation that does not require decomposition into symmetrical components; the direct flux and torque control schemes have been proved to be preponderant for doubly-fed induction generators due to the simple implementation. Aim: This work presents the minimization of electromagnetic torque and rotor flux undulations of doubly-fed induction generators using fractional-order super twisting algorithms and modified space vector modulation techniques. Methods: The main role of direct flux and torque control is to regulate and control the electromagnetic torque and rotor flux of doubly-fed induction generators for wind turbine systems. The direct flux and torque control is a traditional control algorithm and robust technique. Fractional-order super twisting algorithms are a new and proposed nonlinear controller; characterized by a robust controller and a simpler algorithm, which gives a good harmonic distortion of current compared to other methods. Novelty: The A fractional-order super twisting algorithm is proposed. Proposed nonlinear controller construction is based on the traditional super twisting algorithm and fractional calculus to obtain a robust controller and reduces the electromagnetic torque and rotor flux undulations of doubly-fed induction generators. We use in our study a 1.5 MW doubly-fed induction generator integrated into a single-rotor wind turbine system to minimizes the electromagnetic torque, stator current, rotor flux undulations. As shown in the results figures using fractional-order super twisting algorithms ameliorate effectiveness especially minimizes the electromagnetic torque and rotor flux, and minimizes harmonic distortion of stator current (0.16 %) compared to the traditional control scheme. Results: As shown in the results figures using fractional-order super twisting algorithms ameliorate effectiveness especially minimizes the electromagnetic torque and rotor flux, and minimizes harmonic distortion of stator current (0.16 %) compared to the traditional control scheme. Conclusion: The direct flux and torque control are a robust, simple, and alternative approach control formulation that does not require decomposition into symmetrical components; the direct flux and torque control schemes have been proved to be preponderant for doubly-fed induction generators due to the simple implementation.

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2

Aaditya, Angga Wahyu, Dedid Cahya Happyanto, and Bambang Sumantri. "Application of Sliding Mode Control in Indirect Field Oriented Control (IFOC) for Model Based Controller." EMITTER International Journal of Engineering Technology 5, no. 2 (January 13, 2018): 255–69. http://dx.doi.org/10.24003/emitter.v5i2.193.

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Indirect Field Oriented Control (IFOC) is one of the vector control methods that can be applied to induction motor in the industrial world rather than Direct Field Oriented Control (DFOC) because of the flux is obtained from the formulation. However, IFOC can not guarantee the robustness and stability of the systems. Stability analysis such as Lyapunov Stability Theory can be used to make the system stable but not the robustness. Model based controller that can guarantee the stability and robustness such as sliding mode control (SMC) and fuzzy needs to be added in IFOC system to achieve proportional response system. Robust current regulator using sliding mode control was designed in this paper from state space model for model based controller. In transient response and under disturbance SMC shows better performance than PID in rising time and robustness at rotor speed and stator current.

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3

Dybkowski, Mateusz, and Szymon Antoni Bednarz. "Modified Rotor Flux Estimators for Stator-Fault-Tolerant Vector Controlled Induction Motor Drives." Energies 12, no. 17 (August 22, 2019): 3232. http://dx.doi.org/10.3390/en12173232.

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This paper deals with fault-tolerant control (FTC) of an induction motor (IM) drive. An inter-turn short circuit (ITSC) of the stator windings was taken into consideration, which is one of the most common internal faults of induction machines. The sensitivity of the classic, well-known voltage and current models to the stator winding faults was analyzed. It has been shown that these classical state variable estimators are sensitive to induction motor parameter changes during stator winding failure, which results in unstable operation of the direct field-oriented control (DFOC) drive. From a safety-critical applications point of view, it is vital to guarantee stable operation of the drive even during faults of the machine. Therefore, a new FTC system has been proposed, which consists of new modified rotor flux estimators, robust to stator winding faults. A detailed description of the proposed system is presented herein, as well as the results of simulation and experimental tests. Simulation analyses were performed using MATLAB/Simulink software. Experimental tests were carried out on the experimental test bench with a dSpace DS1103 card. The proposed solution could be applied as an alternative rotor flux estimation technique for the modern FTC drive.

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4

Wróbel, Karol, Piotr Serkies, and Krzysztof Szabat. "Model Predictive Base Direct Speed Control of Induction Motor Drive—Continuous and Finite Set Approaches." Energies 13, no. 5 (March 5, 2020): 1193. http://dx.doi.org/10.3390/en13051193.

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In the paper a comparative study of the two control structures based on MPC (Model Predictive Control) for an electrical drive system with an induction motor are presented. As opposed to the classical approach, in which DFOC (Direct Field Oriented Control) with four controllers is considered, in the current study only one MPC controller is utilized. The proposed control structures have a cascade free structure that consists of a vector of electromagnetic (torque, flux) and mechanical (speed) states of the system. The first investigated framework is based on the finite-set MPC. A short horizon predictive window is selected. The continuous set MPC is used in the second framework. In this case the predictive horizon contains several samples. The computational complexity of the algorithm is reduced by applying its explicit version. Different implementation aspects of both MPC structures, for instance the model used in prediction, complexity of the control algorithms, and their properties together with the noise level are analyzed. The effectiveness of the proposed approach is validated by some experimental tests.

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5

Fabbri, Stefano, Klaus Schuhmacher, Matthias Nienhaus, and Emanuele Grasso. "Improvement of Position Estimation of PMSMs Using an Iterative Vector Decoupling Algorithm." Energies 14, no. 1 (January 5, 2021): 245. http://dx.doi.org/10.3390/en14010245.

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This paper presents an improvement of sensorless techniques based on anisotropy for the estimation of the electrical angular position of synchronous machines by means of an iterative algorithm. The presented method reduces the effect of the fourth saliency harmonics on the measured signals avoiding the use of an observer or filter, thus, no additional dynamics are introduced on the system. Instead, a static algorithm based on iterative steps is proposed, minimizing the angular position error. The algorithm is presented and applied using the DFC (Direct Flux Control) technique but it is not limited to this choice. The advantages and limitations of this method are presented within this paper. The proof of the algorithm convergence is given. Simulations and experimental tests are performed in order to prove the effectiveness of the proposed algorithm.

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6

Abdullah, Ali Najim, and Mohammed Hasan Ali. "Direct torque control of IM using PID controller." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 1 (February 1, 2020): 617. http://dx.doi.org/10.11591/ijece.v10i1.pp617-625.

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Direct torque control "DTC" technique is one of a high performance control system of an AC motor drive, which was proposed after the vector oriented control scheme during the resent 25 years. It has been developed rapidly for its concise system scheme, transient and dynamic performance. The DTC mechanism consists of voltage vector selection table, two hysteresis comparators and two estimators one for stator flux and another for electromagnetic torque. DTC is directly control torque and flux by using Voltage Source Inverter VSI, space vector and stator flux orientation and indirect speed regulated. A several control techniques can be used for improving the torque and flux performance. In this paper, the DTC with Proportional-Integral-Derivative (PID) controller used to improve the starting and dynamic performance of asynchronous motor AM, which gives good torque and flux response, best speed control and also minimize the unacceptable torque ripple. The mathematical model of DTC with PID controller of 3-phase induction motor IM are simulated under Matlab-Simulink. Therefore, the DTC based on PID controller has good performance of IM compared to classical DTC for starting, running state and also during change in load.

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7

Pellegrino, Gianmario, Radu Iustin Bojoi, and Paolo Guglielmi. "Unified Direct-Flux Vector Control for AC Motor Drives." IEEE Transactions on Industry Applications 47, no. 5 (September 2011): 2093–102. http://dx.doi.org/10.1109/tia.2011.2161532.

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8

Qin, Yugui, Kaiyuan Wang, and Huiran Luo. "Fuzzy Direct Torque Control of Surface Permanent Magnet Synchronous Motor." Journal of Physics: Conference Series 2396, no. 1 (December 1, 2022): 012016. http://dx.doi.org/10.1088/1742-6596/2396/1/012016.

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Abstract To solve the problems of large torque and flux ripple in direct torque control (DTC) of permanent magnet synchronous motors (PMSM), a fuzzy controller is used to replace hysteresis comparators and switching tables in the DTC. Different from the conventional fuzzy controller which only outputs the angle or amplitude of the voltage vector, the controller adjusts the angle and value of the voltage vector at the same time in the surface PMSM DTC system is proposed. The inputs and output of the fuzzy controller are: stator flux, torque error, angle and amplitude of voltage vector in stator flux coordinate system. The simulation results of proposed fuzzy control system work normally. Compared with conventional fuzzy control systems, stator flux and torque ripples are decreased and only when motor speed is negative, torque ripple is a little higher. To suppress torque ripple at negative speed, two membership functions of torque error are designed and the fuzzy control system can select the proper membership function according to motor speed. Simulation results show adaptive fuzzy control system can effectively reduce torque and flux ripple in four quadrants.

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9

Zhang, Wei, Ping Zhang, Xin Hao Zhang, and Xiao Feng Shen. "An Effective Direct Torque Control Based on Space Vector Modulation for DTP-PMSM." Applied Mechanics and Materials 416-417 (September 2013): 480–85. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.480.

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This paper has proposed an efficient direct torque control strategy based on space vector modulation (SVM-DTC) for dual three-phase permanent magnet synchronous motor (DTP-PMSM), which is implemented in a synchronous reference frame aligned with the machine stator flux vector. This strategy adopts the space vector modulation technique to compensate for the stator flux error, and then the continuous smooth response of the vector control and the rapid response of direct torque control are both achieved. Simulation studies of a 3KW DTP-PMSM are carried out. Simulation results show the improvement of the torque response, decrease of the torque ripple, the higher steady performance and better flux waveform.

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10

Peresada, Sergiy M., Serhii M. Kovbasa, Oleksii V. Statsenko, and Oleg V. Serhiienko. "Direct speed-flux vector control of induction motors: controller design and experimental robustness evaluation." Applied Aspects of Information Technology 5, no. 3 (October 25, 2022): 217–27. http://dx.doi.org/10.15276/aait.05.2022.15.

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The paper presents a general theoretical solution oftheinduction motor speed-fluxdirect vector control, which is based on the second Lyapunov method application. The structure of the direct vector control algorithm involves the use of anyasymptotic flux observer with exponential stability properties. Suchapproach led to improvement of the vector control system robustness properties. A constructive procedure for the designof correction termsof the rotor flux observer is proposed.Designed family of the flux ob-servers guarantees the exponential stability and robustification with respect ofparametric disturbances. It is shown that the proposedsolution guarantees: global exponential trackingof the speed-flux reference trajectories together with asymptotic field orientation, asymptotic exponential estimation of the rotor flux, as well as asymptotic decoupling of torque (speed) and flux control. Comparative experimental study shows that new controller providesstabilization of the control performancesas well as efficiency at nominal levelwhen the rotor active resistance changes. The proposed direct vector control structures can be used for the development of energy-efficient high performanceinduction motor drives for metalworking, packaging equipment, modern electric transport and special equipment.

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11

Wan, Luo Fei, Xian Xing Liu, Zheng Qi Wang, and Jin Wei Zhou. "Direct Torque Control of Bearingless Induction Motor Using Space Vector Pulse Width Modulation Based on Fuzzy Adaptive Control." Advanced Materials Research 383-390 (November 2011): 7321–27. http://dx.doi.org/10.4028/www.scientific.net/amr.383-390.7321.

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This paper presents a new strategy of direct torque controller for bearingless induction motor using space vector pulse width modulation based on fuzzy adaptive control. when we use direct torque controller using space vector pulse width modulation to take decoupling, the parameters of PI controller which generating the reference voltage vector in conventional SVM-DTC are difficult to determine the dynamic operation. In order to improve away the disadvantages of conventional SVM-DTC system, flux and torque fuzzy adaptive controller were designed to substitute the original flux and torque PI controller in the controlling for bearingless induction motor using space vector pulse width modulation. With the fuzzy algorithm, it is easy to obtain the control voltage component of the flux and torque respectively. Two voltage vectors achieve real-time adjustment and solve the disturbance problems in torque loop and flux loop. In this paper, the design process of the fuzzy adaptive controller is given. Use Matlab/Simulink to check the improved and traditional SVM-DTC method. The results show that the improved algorithms have a better performance in reducing the ripple of torque, flux and Rotor displacement when compared with the tradition DTC method. And it also improves the system dynamic performance.

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12

Tan, Jian-Ding, Siaw-Paw Koh, Sieh-Kiong Tiong, Kharudin Ali, and Ahmed Abdalla. "Fuzzy Logic Enhanced Direct Torque Control with Space Vector Modulation." Indonesian Journal of Electrical Engineering and Computer Science 11, no. 2 (August 1, 2018): 704. http://dx.doi.org/10.11591/ijeecs.v11.i2.pp704-710.

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Over the past few years, multiple types of modifications have been proposed onto the Direct Torque Control (DTC) scheme. Among others is the implementation of Space Vector Modulation (SVM). In this paper, two new control strategies are proposed onto an SVM-DTC. Instead of using PI torque and flux controllers, a fuzzy logic control method is implemented in the proposed modification to achieve a more constant switching frequency while minimizing the torque error. The fuzzy logic controller controls the voltages in direct and quadratic reference frame (Vd, Vq). This approach fully utilizes the switching capability of the inverter and thus improving the overall system performance. To overcome issues in open loop stator flux such as DC drift and saturation, a closed loop estimation method of stator flux is also proposed based on voltage model and low pass filter. The performance of the proposed control strategy is benchmarked with that of a conventional DTC–SVM. Simulations and experiments were carried out and the results show that the proposed method outperforms the conventional DTC-SVM in terms of DC-offset elimination and overall system robustness. Over the past few years, multiple types of modifications have been proposed onto the Direct Torque Control (DTC) scheme. Among others is the implementation of Space Vector Modulation (SVM). In this paper, two new control strategies are proposed onto an SVM-DTC. Instead of using PI torque and flux controllers, a fuzzy logic control method is implemented in the proposed modification to achieve a more constant switching frequency while minimizing the torque error. The fuzzy logic controller controls the voltages in direct and quadratic reference frame (Vd, Vq). This approach fully utilizes the switching capability of the inverter and thus improving the overall system performance. To overcome issues in open loop stator flux such as DC drift and saturation, a closed loop estimation method of stator flux is also proposed based on voltage model and low pass filter. The performance of the proposed control strategy is benchmarked with that of a conventional DTC–SVM. Simulations and experiments were carried out and the results show that the proposed method outperforms the conventional DTC-SVM in terms of DC-offset elimination and overall system robustness.

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13

Wang, De Cheng, Er Hao Liu, and Hui Lin. "One Approach for Direct Torque Control Switching Voltage Vector Selection." Applied Mechanics and Materials 246-247 (December 2012): 867–71. http://dx.doi.org/10.4028/www.scientific.net/amm.246-247.867.

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Direct torque control selected switching voltage vector according to torque hysteresis comparator output, flux hysteresis comparator output, and sector. One switching voltage vector selection approach was proposed. It used support vector regression machine to carry out direct torque control switching voltage vector selection. The selection of eight switching voltage vectors was an eight classification problem. This classification problem was changed into regression problem by support vector regression machine. The nonlinear function used for switching voltage vector selection was gained by support vector regression machine training. Asynchronous motor direct torque control simulation result shows feasibility and effectivity of proposed method.

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14

Min, Zun Nan, Xiao Feng Zhang, and Ting Jian Zhong. "The Research of Direct Torque Control of Induction Motor Based on Efficiency Optimization." Advanced Materials Research 650 (January 2013): 537–42. http://dx.doi.org/10.4028/www.scientific.net/amr.650.537.

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Starting from the space vector equations of induction motor, it is deduced space vector equations of induction motor based on iron loss, and calculated the flux equation of optimal loss in determining the output of the speed and torque. by the optimal flux control, improving direct torque control system, the simulation is verified feasibility.

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15

Xu, Shu Ping, Shu Rong Wang, and Xiao Hui Su. "The Research of Direct Torque Control Based on Full-Dimensional State Observer." Advanced Materials Research 433-440 (January 2012): 1576–81. http://dx.doi.org/10.4028/www.scientific.net/amr.433-440.1576.

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To overcome integrator initial value, error accumulation and DC offset of pure integration, there proposed a permanent magnet synchronous motor stator flux observation method based on full-dimensional state observer. It uses the stator flux as state vector structural system state equation, the current as the output vector structural system output equation. And it configures the observer poles proportional to the motor model poles and use robust pole assignment algorithm in Matlab for observer gain matrix calculation. Experiments show that the full-dimensional observer on the stator flux observed has higher accuracy. The direct torque control system has better performance.

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16

Peicheng, Shi, Wang Suo, Zhang Rongyun, and Xiao Ping. "Study on the fuzzy proportional–integral–derivative direct torque control strategy without flux linkage observation for brushless direct current motors." International Journal of Advanced Robotic Systems 16, no. 3 (May 1, 2019): 172988141985314. http://dx.doi.org/10.1177/1729881419853141.

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Considering the difficulty in setting and observing the flux linkage in the existing direct torque control for the brushless direct current motor, which is the cumbersome torque calculation method in direct torque control systems without flux linkage observation, the torque observation, voltage vector selection, and speed loop were studied further in such systems. The fuzzy proportional–integral–derivative direct torque control strategy is presented without flux linkage observation. In terms of torque observation, the cumbersome counter electromotive force calculation method was abandoned, and observation was made combining the three-phase current and Hall signal. In terms of optimal choice of voltage vector, the voltage vector selection table was built using the voltage hysteresis output and Hall signal. In terms of rotation speed control, the adaptive fuzzy proportional–integral–derivative was used to replace the traditional proportional–integral–derivative for the proportional–integral–derivative parameter self-adjustment. A control system simulation model was set up in MATLAB/Simulink for simulation verification. A hardware experimental platform was set up using DSP2812 as the main control board for experimental verification. The research results show that the fuzzy proportional–integral–derivative direct torque control without flux linkage observation further increased the dynamic response rate of the motor speed and reduced the electromagnetic torque ripple amplitude; thus, it is more suitable for application in high-precision and high-stability systems.

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17

Li, Guo Hong, and Yi Li. "Simulation Research of Asynchronous Motor Direct Torque Control System Based on MATLAB." Applied Mechanics and Materials 577 (July 2014): 364–67. http://dx.doi.org/10.4028/www.scientific.net/amm.577.364.

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Compared with vector control, direct torque control (DTC) spurned coupling idea and canceled circumgyration coordinates transform. By detecting motor’s stator voltage and current, along with calculating motor’s flux and torque in virtue of the instantaneous space vector theory, DTC controlled flux and torque directly according to the difference between the detecting value and design value. DTC also reduced calculation amount and overcomed the flaw that the system was disturbed by motor’s parameters easily, which were the problems in the vector control. On the basis approach mentioned above, this paper realized the system simulation using DTC. Simulation shows that asynchronous motor control has favorable ability of speed adjusting, short startup time, excellent stability.

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18

Pellegrino, Gianmario, Barbara Boazzo, and Thomas M. Jahns. "Plug-in Direct-Flux Vector Control of PM Synchronous Machine Drives." IEEE Transactions on Industry Applications 51, no. 5 (September 2015): 3848–57. http://dx.doi.org/10.1109/tia.2015.2420631.

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19

Rubino, Sandro, Iustin Radu Bojoi, Eric Armando, and Alberto Tenconi. "Deadbeat Direct Flux Vector Control of Surface Permanent Magnet Motor Drives." IEEE Transactions on Industry Applications 56, no. 3 (May 2020): 2685–99. http://dx.doi.org/10.1109/tia.2020.2972835.

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20

Dangeam, Sirichai. "Three-Phase Inverter with Direct Torque Control for a Brushless DC Motor." ECTI Transactions on Electrical Engineering, Electronics, and Communications 20, no. 1 (February 18, 2022): 133–42. http://dx.doi.org/10.37936/ecti-eec.2022201.246118.

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Анотація:

This paper presents the implementation of a three-leg voltage source inverter fed by a brushless DC motor. The open-loop speed control with direct torque is employed in this motor. The rotation of the motor is controlled by using an optimal voltage vector which is related to the calculation of stator flux and electromechanical torque. The experimental results show that this system has greater capability to reduce spike and ripple on the voltage, current, stator flux, and electromechanical torque than the conventional speed controller which feeds the voltage vector from the hall-effect sensors.

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21

Abbas, Najimaldi M. "Squirrel cage induction motor predictive direct torque control based on multi-step delay compensation." International Journal of Applied Power Engineering (IJAPE) 10, no. 3 (September 1, 2021): 244. http://dx.doi.org/10.11591/ijape.v10.i3.pp244-252.

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The squirrel cage induction motor direct torque control main problems due to torque and large stator flux pulsation. In this an improved model predictive direct torque control algorithm considering multi-step delay compensation is proposed. At each sampling moment, predict the stator flux linkage and torque at the next moment under each voltage vector. The optimal voltage vector deviation from the stator flux linkage reference value and torque reference value are selected as the minimum objective function. Aiming at the problem of one-shot delay in digital control systems, a multi-step predictive delay compensation measure is studied. Simulation shows that the algorithm can effectively reduce torque and stator flux pulsation, reduce current harmonic distortion, and solve the delay problem in digital systems.

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22

Yousefi-Talouki, Arzhang, Paolo Pescetto, and Gianmario Pellegrino. "Sensorless Direct Flux Vector Control of Synchronous Reluctance Motors Including Standstill, MTPA, and Flux Weakening." IEEE Transactions on Industry Applications 53, no. 4 (July 2017): 3598–608. http://dx.doi.org/10.1109/tia.2017.2679689.

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23

Reguig Berra, Ahmed, Said Barkat, and Mansour Bouzidi. "Virtual Flux Predictive Direct Power Control of Five-level T-type Multi-terminal VSC-HVDC System." Periodica Polytechnica Electrical Engineering and Computer Science 64, no. 2 (January 8, 2020): 133–43. http://dx.doi.org/10.3311/ppee.14441.

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This paper proposes a Virtual Flux Predictive Direct Power Control (PDPC) for a five-level T-type multi-terminal Voltage Source Converter High Voltage Direct Current (VSC-HVDC) transmission system. The proposed PDPC scheme is based on the computation of the average voltage vector using a virtual flux predictive control algorithm, which allows the cancellation of active and reactive power tracking errors at each sampling period. The active and reactive power can be estimated based on the virtual flux vector that makes AC line voltage sensors not necessary. A constant converter switching frequency is achieved by employing a multilevel space vector modulation, which ensures the balance of the DC capacitor voltages of the five-level t-type converters as well. Simulation results validate the efficiency of the proposed control law, and they are compared with those given by a traditional direct power control. These results exhibit excellent transient responses during range of operating conditions.

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Wang, Shun Yuan, Chwan Lu Tseng, Shou Chuang Lin, Jen Hsiang Chou, and Chih Chen Chen. "Takagi-Sugeno Fuzzy Estimator Design for Adaptive Vector Control Systems." Applied Mechanics and Materials 284-287 (January 2013): 2337–40. http://dx.doi.org/10.4028/www.scientific.net/amm.284-287.2337.

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Анотація:

This paper presents an adaptive pseudo reduced-order Takagi-Sugeno (T-S) fuzzy flux estimator for the induction motor direct field orientation control system. The estimator gain can be obtained by solving a set of linear matrix inequalities (LMIs) to estimate the rotor flux accurately. It is well known that, because of changes in temperature, variations of stator and rotor resistances affect the accuracy of rotor flux estimation. To resolve this problem, a cerebellar model articulation proportional integral controller (CMAPIC) is proposed to estimate the stator and rotor resistances during temperature variations. These estimated quantities, including stator and rotor resistances, are taken as the T-S fuzzy flux estimator inputs, so that the flux estimation is uninfluenced by these parameter variations. Thus the estimators enhance the robustness of the system. Moreover, this work uses a cerebellar model articulation controller to estimate the rotor speed, which is fed back to the adaptive supervisory fuzzy cerebellar model articulation speed controller (ASFCMAC) to achieve the speed sensor-less control.

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25

Ning, Bowen, Shanmei Cheng, Baokang Yan, and Fengxing Zhou. "Examination and implementation for direct torque controlled permanent magnet synchronous motor with space vector modulation." Proceedings of the Institution of Mechanical Engineers, Part I: Journal of Systems and Control Engineering 233, no. 2 (July 18, 2018): 153–63. http://dx.doi.org/10.1177/0959651818787006.

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Анотація:

This study investigates the direct torque control strategy of permanent magnet synchronous motor with the space vector modulation, on account of large torque fluctuation and varied switching frequency of classic direct torque control strategy. The relationship among the terminal control voltages and the torque and stator flux of the permanent magnet synchronous motor is derived through the dynamic model of motor. Accordingly, the torque and the flux closed-loop feedback control structure are established, where the error signals are regulated by the proportional and integral controllers to generate output voltages. Furthermore, the parameters of the controllers are designed through explicitly analyzing the frequency domain models of the torque control loop and the flux control loop. The accurate calculation formula of control parameters, which has both explicit setting target and definite physical meaning, is obtained. Therefore, the design of torque and flux controller parameters becomes easy in the direct torque control with space vector modulation technology, and satisfactory flux and torque control can be acquired. Finally, simulation and experimental tests are demonstrated in support of the validity of the investigated scheme and the feasibility of the proposed controller parameter design.

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26

Cherifi, Djamila, and Yahia Miloud. "Improvement technique of direct torque control of DFIG based on wind energy conversion system." World Journal of Environmental Research 9, no. 2 (December 31, 2019): 46–58. http://dx.doi.org/10.18844/wjer.v9i2.4627.

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Анотація:

This paper presents a comparative study between two strategies for the direct torque control (DTC) of the doubly fed induction generator based on the wind energy conversion system. The first method is a conventional DTC and it is based on hysteresis controllers where the torque and the flux are regulated by these controllers. The second one is DTC by space vector modulation strategy (DTC-SVM) where the torque and flux are regulated by PI controllers. The main feature of the proposed (DTC-SVM) strategy is the reduction of torque and flux ripples. Simulation results of this proposed system were analysed using the MATLAB environment. Keywords: Doubly fed induction generator (DFIG), wind power generation systems, direct torque control (DTC), space vector modulation (SVM).

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27

Du, Mingxing, Ye Tian, Wenbai Wang, Ziwei Ouyang, and Kexin Wei. "A Novel Finite-Control-Set Model Predictive Directive Torque Control Strategy of Permanent Magnet Synchronous Motor with Extended Output." Electronics 8, no. 4 (March 31, 2019): 388. http://dx.doi.org/10.3390/electronics8040388.

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Анотація:

The performance of conventional direct torque control strategy from the viewpoint of flux and torque ripples has been unsatisfactory. Therefore, this study aims to propose a novel finite-control-set model predictive direct torque control strategy with extended output based on two-step prediction. An appropriate pre-selected vector, which is modulated in a specific manner, is selected through a look-up table and then used to optimise the pre-selected voltage vector based on the computing result from the model prediction and output it. The proposed strategy extends the range of the vectors that can be used to enhance the flux and torque control performance and reduce ripples and computational complexity in comparison with the conventional finite-control-set model predictive direct torque control. The feasibility of the proposed method is verified by conducting a verification test using dSPACE and Tyhpoon HIL 402 experimental platform.

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28

Liu, Bin, Yue Zhao, and Hui-Zhong Hu. "Structure-variable sliding mode control of interior permanent magnet synchronous motor in electric vehicles with improved flux-weakening method." Advances in Mechanical Engineering 10, no. 1 (January 2018): 168781401770435. http://dx.doi.org/10.1177/1687814017704355.

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A kind of flux-weakening control method based on speed loop structure-variable sliding mode controller is proposed for interior permanent magnet synchronous motor in electric vehicles. The method combines maximum torque per ampere with vector control strategy to control electric vehicle’s interior permanent magnet synchronous motor. During the flux-weakening control phase, the anti-windup integral controller is introduced into the current loop to prevent the current regulator from entering the saturated state. At the same time, in order to further improve the utilization rate of the direct current bus voltage and expand the flux-weakening regulating range, a space vector pulse-width modulation over-modulation unit is employed to contravariant the direct current bus voltage. Comparing with the conventional proportional–integral controller, the proposed sliding mode control algorithm shows that it has more reliable control performance. In addition, more prominent flux-weakening performance of the proposed flux-weakening method is illustrated by numerical simulation comparison.

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29

Boazzo, Barbara, and Gianmario Pellegrino. "Model-Based Direct Flux Vector Control of Permanent-Magnet Synchronous Motor Drives." IEEE Transactions on Industry Applications 51, no. 4 (July 2015): 3126–36. http://dx.doi.org/10.1109/tia.2015.2399619.

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30

Odhano, Shafiq Ahmed, Radu Bojoi, Aldo Boglietti, Stefan George Rosu, and Giovanni Griva. "Maximum Efficiency per Torque Direct Flux Vector Control of Induction Motor Drives." IEEE Transactions on Industry Applications 51, no. 6 (November 2015): 4415–24. http://dx.doi.org/10.1109/tia.2015.2448682.

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31

Tripathi, A., A. M. Khambadkone, and S. K. Panda. "Direct Method of Overmodulation With Integrated Closed Loop Stator Flux Vector Control." IEEE Transactions on Power Electronics 20, no. 5 (September 2005): 1161–68. http://dx.doi.org/10.1109/tpel.2005.854049.

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32

Sun, Tianfu, Jiabin Wang, and Mikail Koc. "Self-Learning Direct Flux Vector Control of Interior Permanent-Magnet Machine Drives." IEEE Transactions on Power Electronics 32, no. 6 (June 2017): 4652–62. http://dx.doi.org/10.1109/tpel.2016.2602243.

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33

Listwan, Jacek, and Krzysztof Pieńkowski. "Comparative Analysis of Control Methods with Model Reference Adaptive System Estimators of a Seven-Phase Induction Motor with Encoder Failure." Energies 14, no. 4 (February 21, 2021): 1147. http://dx.doi.org/10.3390/en14041147.

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This article presents a comparative analysis of the direct torque control with space vector modulation method for seven-phase squirrel-cage induction motor during the encoder failure. The direct torque control with space vector modulation method with model reference adaptive system with current model and current estimator and model reference adaptive system—flux based estimator applied in the control loop of the motor speed have been analyzed. The mathematical model of the seven-phase induction motor and model reference adaptive system-type estimators have been described. The method of space vector modulation applied to the seven-phase voltage source inverter, controlled seven-phase induction motor, has been described. The operation of direct torque control with space vector modulation has been verified via simulation tests, and the results of performed simulation studies have been analyzed and presented. The authors’ original contribution and work novelty includes comparison studies of the performance of the direct torque control method with space vector modulation of a seven-phase induction motor with two estimators: model reference adaptive system—flux based estimator and the novel model reference adaptive system with current model and current estimator.

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34

Peresada, S., S. Bozhko, S. Kovbasa, and Ye Nikonenko. "ROBUST DIRECT FIELD ORIENTED CONTROL OF INDUCTION GENERATOR." Tekhnichna Elektrodynamika 2021, no. 4 (June 17, 2021): 14–24. http://dx.doi.org/10.15407/techned2021.04.014.

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A novel and robust field oriented vector control method for standalone induction generators (IG) is presented. The proposed controller exploits the concept of direct field orientation and provides asymptotic rotor flux modulus and DC-link voltage regulations when a DC-load is constant or slowly varying. Flux subsystem, designed using Lyapunov’s second method, has, in contrast to standard structures, closed loop properties and therefore is robust with respect to rotor resistance variations. A decomposition approach on the base of the two-time scale separation of the voltage and torque current dynamics is used for design of the voltage subsystem. The feedback linearizing voltage controller is designed using a steady state IG power balance equation. The resulting quasi-linear dynamics of the voltage control loop allows use of simple controllers tuning procedure and provides an improved dynamic performance for variable speed and flux operation. Results of a comparative experimental study with standard indirect field oriented control are presented. In contrast to existing solutions, the designed controller provides system performances stabilization when speed and flux are varying. It is experimentally shown that a robust field oriented controller ensures robust flux regulation and robust stabilization of the torque current dynamics leading to improved energy efficiency of the electromechanical conversion process. The proposed controller is suitable for energy generation systems with variable speed operation. References 18, figures 8.

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35

Ton, That-Dong, and Min-Fu Hsieh. "A Deadbeat Current and Flux Vector Control for IPMSM Drive with High Dynamic Performance." Applied Sciences 12, no. 8 (April 8, 2022): 3789. http://dx.doi.org/10.3390/app12083789.

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In this paper, a new deadbeat stator current and flux linkage vector control (DB-CFVC) scheme for interior permanent magnet synchronous machines (IPMSM) is proposed. The control structure is simplified by implementing the proposed flux linkage vector control method in the α-β stationary coordinate. Unlike conventional deadbeat methods, the dynamic performance of the proposed DB-CFVC can be enhanced while voltage command saturation and over output current are avoided. This is achieved with a “reinforced” phase angle reference of stator flux linkage vector by considering rotor speed error and maximum voltage to properly enhance the quality of the calculated flux phase angle command. By predicting stator flux linkage and current in the stationary coordinate, the deadbeat direct flux linkage vector control based on the one-step delay compensation strategy becomes straightforward and exhibits low sensitivity to motor parameters compared to conventional methods performed in the rotating frame. Then, by developing a practical and robust hybrid flux linkage observer, the proposed DB-CFVC method can work more reliably and effectively than conventional methods. Simulations and experiments are conducted in a drive system for an IPMSM to evaluate the effectiveness and reliability of the proposed method.

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36

Yang, Wen Jie. "Study on Direct Torque Control of Brushless Doubly-Fed Machine Based on Discete Space Vector Modulation." Applied Mechanics and Materials 615 (August 2014): 402–8. http://dx.doi.org/10.4028/www.scientific.net/amm.615.402.

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The paper introduces Working mode of brushless doubly-fed machine（BDFM） and mathematical model in the d-q coordinates for BDFM，a strategy of discrete space vector modulation in direct torque control for BDFM has been Proposed 。The paper uses Matlab / Simulink to model and simulate the system of the direct torque control for brush double-fed motor based on discrete Space Vector Modulation.Simulation results prove that the discrete space vector modulation technique can reduce the torque ripple of traditional direct torque control system for BDFM, and improve waveform of current and Flux of Control winding.

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37

Cherifi, Djamila. "Improvement technique of direct torque control of DFIG based in wind energy conversion system." Global Journal of Information Technology: Emerging Technologies 10, no. 1 (April 30, 2020): 22–34. http://dx.doi.org/10.18844/gjit.v10i1.4630.

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This paper presents a comparative study between two strategies for the direct torque control (DTC) of the doubly fed induction generator (DFIG) based on wind energy conversion system (WECS). The first method is a conventional direct torque control DTC and it is based on hysteresis controllers where the torque and the flux are regulated by these controllers. The second one is direct torque control by space vector modulation strategy (DTC-SVM) where the torque and flux are regulated by PI controllers. The main feature of the proposed (DTC-SVM) strategy is the reduction of torque and flux ripples. Simulation results of this proposed system were analyzed using MATLAB environment

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38

Trivedi, T. A., R. Jadeja, and P. Bhatt. "A Review on Direct Power Control for Applications to Grid Connected PWM Converters." Engineering, Technology & Applied Science Research 5, no. 4 (August 17, 2015): 841–49. http://dx.doi.org/10.48084/etasr.544.

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The Direct Power Control strategy has become popular as an alternative to the conventional vector oriented control strategy for grid connected PWM converters. In this paper, Direct Power Control as applied to various applications of grid connected converters is reviewed. The Direct Power Control for PWM rectifiers, Grid Connected DC/AC inverters applications such as renewable energy sources interface, Active Power Filters, Doubly Fed Induction Generators and AC-DC-AC converters are discussed. Control strategies such as Look-Up table based control, predictive control, Virtual Flux DPC, Model based DPC and DPC-Space Vector Modulation are critically reviewed. The effects of various key parameters such as selection of switching vector, sampling time, hysteresis band and grid interfacing on performance of direct power controlled converters are presented.

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39

Weina, Miao, Zhang Yi, Wei Haifeng, Liu Liming, Zhang Jiong, and Jin Cheng. "RESEARCH ON DIRECT TORQUE CONTROL OF BRUSHLESS DC MOTOR BASED ON NEW STATOR FLUX LINKAGE SETTING." EPH - International Journal of Science And Engineering 3, no. 3 (September 27, 2017): 81–89. http://dx.doi.org/10.53555/eijse.v3i3.99.

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Aiming at the torque ripple problem of Brushless DC motor, a new stator flux setting method is proposed on the basis of direct torque control system. Firstly, the basic forming principle of traditional stator flux vector locus of circular and hexagonal is analyzed.And then, a new stator flux linkage setting method based on rotor position and dynamic current mode is proposed.The new stator flux linkage method is applied to the direct torque control system of Brushless DC motor.Theoretical analysis shows that the given flux linkage trajectory is consistent with the expected reference value, the torque ripple is smaller. The simulation results verify its effectiveness and are suitable for BLDCM DTC operation.

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40

Rubino, Sandro, Radu Bojoi, Shafiq Ahmed Odhano, and Pericle Zanchetta. "Model Predictive Direct Flux Vector Control of Multi-three-Phase Induction Motor Drives." IEEE Transactions on Industry Applications 54, no. 5 (September 2018): 4394–404. http://dx.doi.org/10.1109/tia.2018.2829458.

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41

Gunabalan, R., P. Sanjeevikumar, Frede Blaabjerg, Patrick W. Wheeler, Olorunfemi Ojo, and Ahmet H. Ertas. "Speed sensorless vector control of parallel-connected three-phase two-motor single-inverter drive system." FACETS 1, no. 1 (March 1, 2017): 1–16. http://dx.doi.org/10.1139/facets-2015-0004.

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This paper presents the characteristic behavior of direct vector control of two induction motors with sensorless speed feedback having the same rating parameters, paralleled combination, and supplied from a single current-controlled pulse-width-modulated voltage-source inverter drive. Natural observer design technique is known for its simple construction, which estimates the speed and rotor fluxes. Load torque is estimated by load torque adaptation and the average rotor flux was maintained constant by rotor flux feedback control. The technique’s convergence rate is very fast and is robust to noise and parameter uncertainty. The gain matrix is absent in the natural observer. The rotor speed is estimated from the load torque, stator current, and rotor flux. Under symmetrical load conditions, the difference in speed between two induction motors is reduced by considering the motor parameters as average and difference. Rotor flux is maintained constant by the rotor flux control scheme with feedback, and the estimation of rotor angle is carried out by the direct vector control technique. Both balanced and unbalanced load conditions are investigated for the proposed AC motor drive system. Experimental results presented in this paper show good agreement with the theoretical formulations.

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42

Chen, Di, Rui Juan Hou, Jie Li, and Jin Niu Tao. "The Research of Improved Scheme for Asynchronous Motor Direct Torque Control." Advanced Materials Research 466-467 (February 2012): 819–23. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.819.

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This paper proposed a kind of new control method for resolving the problem of the Direct Torque Control (DTC)'s greater torque pulsation problem at low speed, this method is based on Space Vector Pulse Width Modulation (SVPWM). SVPWM is a kind of excellent Pulse Width Modulation (PWM) scheme. It can not only improve the inverter DC voltage utilization, reduce harmonic losses, restrain torque pulsation, also easily generate high-precision real-time waveform by the high-speed digital signal processor. The simulation results of this system by Matlab/Simulink indicate that the space vector PWM direct torque control can efficiently reduce the pulse of motor torque and flux linkage.

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43

Jun Zhang and M. F. Rahman. "A Direct-Flux-Vector-Controlled Induction Generator With Space-Vector Modulation for Integrated Starter Alternator." IEEE Transactions on Industrial Electronics 54, no. 5 (October 2007): 2512–20. http://dx.doi.org/10.1109/tie.2007.900338.

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44

Chikh, K., A. Saad, M. Khafallah, D. Yousfi, F. Z. Tahiri, and M. Hasoun. "A Constant Switching Frequency DTC for PMSM Using Low Switching Losses SVM–An Experimental Result." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 2 (June 1, 2017): 558. http://dx.doi.org/10.11591/ijpeds.v8.i2.pp558-583.

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A Constant Switching Frequency Direct Torque Control (CSF-DTC) with low switching losses Space Vector modulation (SVM) for Permanent Magnet Synchronous Motor (PMSM) drive is proposed in this work. The CSF-DTC combines Field Oriented Control (FOC) and basic DTC advantages. Indeed, the proposed control strategy improves the basic DTC performances, which features low flux and torque ripples as well as a fixed switching frequency. The improved DTC ensures also a fast and robust flux and torque responses by using Integral and Proportional (IP) controllers which guaranteed a good disturbance rejection.On the other hand, a symmetrical SVM technique with low switching losses in the PWM inverter is used in order to generate the desired stator voltage vector needed to control the stator flux and the motor torque. Simulation and experimental results are presentedin this paper.These results demonstrate well the performance of the basic and proposed DTC and they show the effectiveness of the constant switching frequency direct torque control.

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45

Zahraoui, Yassine, Mohamed Akherraz, Chaymae Fahassa, and Sara Elbadaoui. "Induction Motor DTC Performance Improvement by Reducing Flux and Torque Ripples in Low Speed." Journal of Robotics and Control (JRC) 3, no. 1 (January 12, 2022): 93–100. http://dx.doi.org/10.18196/jrc.v3i1.12550.

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Since induction motors were invented, human civilization has changed forever. Due to their beneficial characteristics, induction motors are widely used and have become the most prevalent electrical counterparts. Many control strategies for induction motors have been developed, varying from scalar to vector control. In the class of vector control, the Direct Torque Control (DTC) was proposed as an alternative that ensures separated flux and torque control while remaining completely in a stationary reference frame. It offers direct inverter switching, reasonable simplicity than other vector control techniques, and less sensitivity to parameter variation. However, the use of hysteresis controllers in conventional DTC involves non-desired ripples in the system's flux and torque, which leads to bad system performances, primarily in low-speed operations. This paper aims to minimize the chattering and ensure the augmented system's performance in terms of robustness and stability. The proposed method is an improved version of DTC, which combines the addition of the Space Vector Machine (SVM) algorithm to the DTC and the increased number of DTC sectors that generate reference control voltages. Satisfactory results have been obtained by numerical simulation in MATLAB/Simulink. Eventually, the proposed method is proven to be a fast dynamic decoupled control that robustly responds to external disturbance and system uncertainties, especially in the low-speed range.

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46

Vasu. R, Ramana, George Fernandez S., and Vijayakumar K. "Enhanced space vector modulated scalar control of induction motor." Indonesian Journal of Electrical Engineering and Computer Science 21, no. 2 (February 1, 2021): 707. http://dx.doi.org/10.11591/ijeecs.v21.i2.pp707-713.

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A conventional vector control of the asynchronous machine makes an analogy of an equivalent separately excited DC machine. It offers a decoupled control of torque and flux which is perpendicular to each other hence one vector is not interfered by other parameters. So, torque and speed control is achieved in an isolated manner even though they are closely interlinked. This is implemented by aligning the rotor flux with the direct axis of the synchronously rotating reference frame. PI controllers play a key role to achieve the desired topology of the VFD. Three controllers are used in the system, flux, speed and torque controller. Tuning of flux controller is quite simple, but in case of speed and torque, it became quite tricky because the output of the speed controller is the reference signal of torque controller. Moreover, there is no distinct method to tune the controllers in the vector control system. Still, the entire high-performance dynamic response of the machine depends on the perfect tuning of those controllers. From the above analysis, it is understood that system identification is essential to tune the PI controllers. But being an asynchronous machine, to obtain system transfer function in a decoupled manner is very difficult. To overcome this problem, the proposed model will be Conventional sine PWM modulated switching pulses are used to implement variable frequency drives for induction motor. Space vector modulated PWM switching pulse is used to fire IGBT. In the case of sine, PWM modulated switching; DC bus voltage utilization is 50% whereas in space vector modulated inverter 57.73% DC Bus voltage utilization can be achieved.

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47

Hussain, Mohammed Khalil, Bajel Mohammed Alshadeedi, and Rashid Hejeejo. "Optimized Kalman filters for sensorless vector control induction motor drives." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 1 (February 1, 2023): 17. http://dx.doi.org/10.11591/ijece.v13i1.pp17-27.

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This paper presents the comparison between optimized unscented Kalman filter (UKF) and optimized extended Kalman filter (EKF) for sensorless direct field orientation control induction motor (DFOCIM) drive. The high performance of UKF and EKF depends on the accurate selection of state and noise covariance matrices. For this goal, multi objective function genetic algorithm is used to find the optimal values of state and noise covariance matrices. The main objectives of genetic algorithm to be minimized are the mean square errors (MSE) between actual and estimation of speed, current, and flux. Simulation results show the optimal state and noise covariance matrices can improve the estimation of speed, current, torque, and flux in sensorless DFOCIM drive. Furthermore, optimized UKF present higher performance of state estimation than optimized EKF under different motor operating conditions.

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48

Rostami, Majid, Seyed M. Madani, and Sul Ademi. "Sensorless Closed-Loop Voltage and Frequency Control of Stand-Alone DFIGs Introducing Direct Flux-Vector Control." IEEE Transactions on Industrial Electronics 67, no. 7 (July 2020): 6078–88. http://dx.doi.org/10.1109/tie.2019.2955421.

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49

Moradian, Mohammadreza, Jafar Soltani, Mohamed Benbouzid, and Abbas Najjar-Khodabakhsh. "A Parameter Independent Stator Current Space-Vector Reference Frame-Based Sensorless IPMSM Drive Using Sliding Mode Control." Energies 14, no. 9 (April 22, 2021): 2365. http://dx.doi.org/10.3390/en14092365.

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In this paper, a sliding mode control is presented for direct torque and stator flux control of interior permanent magnet synchronous motor in a rotor speed sensorless drive system. The control scheme is developed in a specific synchronous rotating reference frame (X-Y) in which the stator current space vector coincides with the direct (X) axis. For this control technique no need to have any knowledge of machine parameters such as stator two-axis inductances, rotor permanent magnets flux linkage, and even the rotor initial position. However, the on-line actual stator resistance value is required to estimate the stator flux components in the stator stationary two-axis reference frame. In this control strategy, two simple methods are described for estimating the rotor speed and stator resistance. Some simulation and experimental results are presented to support the validity and effectiveness of the proposed control scheme.

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50

Zhang, Jia Ying, and Li Ping Zhang. "The Research on Direct Drive Permanent Magnet Synchronous Wind Generator Vector Control." Advanced Materials Research 512-515 (May 2012): 798–802. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.798.

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Direct drive permanent magnet synchronous generator have the advantages of direct drive, simple structure, high efficiency and so on, in which make it become one of mainstream models within MW wind turbine presently. Making the direct drive permanent magnet wind power generation system as the main research object, based on the principle of the operating characteristics of direct drive permanent magnet synchronous wind generator ( DDPMG ), establish mathematical model of the whole system including wind turbine, direct drive permanent magnet synchronous generator and machine side converter, applying the method of stator flux orientation to make the study of vector control strategy, to build the simulation model of direct drive permanent magnet synchronous generator system with Matlab to simulate the operation of generator when wind speed changes by step, the results validate the reasonableness of the model and the correctness and feasibility of the control strategy.

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