scholarly journals A predictive control method for reducing power backflow in DC/AC matrix converter

2021 ◽  
Vol 2087 (1) ◽  
pp. 012041
Author(s):  
Zhipeng Xia ◽  
Ping Jin ◽  
Ling Chang
Keyword(s):  
Dynamic Response ◽  
Predictive Control ◽  
Control Method ◽  
Reducing Power ◽  
Matrix Converter ◽  
Voltage Source ◽  
Attractive Alternative ◽  
Loosely Coupled ◽  
Higher Power ◽  
Optimal Function

Abstract In recent years, DC/AC matrix converter with higher power density have become an attractive alternative to traditional voltage source converters. The traditional PI control has been employed to achieve accurate control, but its dynamic response and stability need to be improved. In this paper, a model predictive control (MPC) with reducing power backflow is introduced in an isolated DC/AC matrix converter with a loosely coupled high-frequency transformer (LCHFT). Prediction model and optimal function model are established to improve the dynamic response of the system and reduce the power backflow.

scholarly journals An Improved Model Predictive Control Method to Drive an Induction Motor Fed by Three-Level Diode-Clamped Indirect Matrix Converter

2020 ◽  
Vol 10 (4) ◽  
pp. 265-279
Author(s):  
Arman Farhadi ◽  
Amir Akbari ◽  
Ali Zakerian ◽  
Mohammad Tavakoli Bina
Keyword(s):  
Model Predictive Control ◽  
Induction Motor ◽  
Predictive Control ◽  
Control Method ◽  
Torque Ripple ◽  
Matrix Converter ◽  
Switching Frequency ◽  
Motor Current ◽  
Supply Current ◽  
Improved Model

In this paper, an improved model predictive control method is proposed to drive an induction motor fed by a three-level matrix converter. The main objective of this paper is to present a novel method to increase the switching frequency at a constant sampling time. Also, it is analytically discussed that increasing the switching frequency not only can decrease the motor current ripples, but it can also significantly reduce its torque ripples. Finally, this study demonstrates that reducing the motor current ripple will improve the quality of the supply current. To be the accurate model and validate the motor drive system, a co-simulation method, which is a combination of FLUX and MATLAB software packages, is employed to find the simulation results. The findings indicate that the proposed method diminishes the THD of the supply current up to 26% approximately. Furthermore, increasing the switching frequency results in the torque ripple reduction by up to 10% almost.

scholarly journals A Dual-Vector Modulated Model Predictive Control Method for Voltage Source Inverters with a New Duty Cycle Calculation Method

Energies ◽  
2020 ◽  
Vol 13 (16) ◽  
pp. 4200
Author(s):  
Lingzhi Cao ◽  
Yanyan Li ◽  
Xiaoying Li ◽  
Leilei Guo ◽  
Nan Jin ◽  
...  
Keyword(s):  
Theoretical Analysis ◽  
Model Predictive Control ◽  
Predictive Control ◽  
Duty Cycle ◽  
Control Method ◽  
Voltage Source ◽  
Voltage Source Inverters ◽  
Dual Vector ◽  
Large Current ◽  
Relationship Of

Recently, model predictive control (MPC) methods have been widely used to achieve the control of two-level voltage source inverters due to their superiorities. However, only one of the eight basic voltage vectors is applied in every control cycle in the conventional MPC system, resulting in large current ripples and distortions. To address this issue, a dual-vector modulated MPC method is presented, where two voltage vectors are selected and utilized to control the voltage source inverter in every control cycle. The duty cycle of each voltage vector is figured out according to the hypothesis that it is inversely proportional to the square root of its corresponding cost function value, which is the first contribution of this paper. The effectiveness of this assumption is verified for the first time by a detailed theoretical analysis shown in this paper based on the geometrical relationship of the voltage vectors, which is another contribution of this paper. Moreover, further theoretical analysis shows that the proposed dual-vector modulated MPC method can also be extended to control other types of inverters, such as three-phase four-switch inverters. Detailed experimental results validate the effectiveness of the presented strategy.

scholarly journals Department of Electrical Power and Machine Engineering, Faculty of Engineering,

2021 ◽  
pp. 46-72
Author(s):  
حمدى محمد سليمان
Keyword(s):  
Dynamic Response ◽  
Permanent Magnet ◽  
Control Method ◽  
Permanent Magnet Synchronous Motor ◽  
Synchronous Motor ◽  
Voltage Source ◽  
Conventional Model ◽  
Current Controller ◽  
Three Phase ◽  
Torque Ripples

This paper aims to reduce the torque ripples in the motor torque, reduce the total harmonics distortion in the motor currents and improve the dynamic response of the permanent magnet synchronous motor. To carry out this study, a modification model was used and compared to conventional model. The main control method used here is a field-oriented control. It was used to generate two decoupled currents control. With help of rotor position, these currents changing into three-phase reference currents. These reference currents were compared to the actual three-phase motor currents. The errors among these currents are introduced to hysteresis current controller to get pulses. These pulses used to drive the voltage source inverter which produces three-phase voltage to drive the motor under study. This technique suffers from some problems as high torque ripples, high total harmonics distortion, the dynamic response isn’t very high because at the beginning of the error and the deviation of the output signal becomes large. This is a conventional model. To overcome these problems, the hysteresis current controller was replaced by gain impedance. The output of this gain is the three-phase voltages. These voltages generate pulses through space vector modulation to drive the inverter to get suitable voltage for the permanent magnet synchronous motor. This modification has decreased the torque ripples and the THD in comparison to the conventional controller. To more improvement in the motor performance, one PI torque current controller and load torque estimator were used to damp the overshooting and decrease the rise time.

A Novel Control Strategy of PWM Rectifier

2013 ◽  
Vol 380-384 ◽  
pp. 290-293
Author(s):  
Wei Wang ◽  
Xin Chun Shi
Keyword(s):  
Dynamic Response ◽  
Reference Frame ◽  
Control Strategy ◽  
Control Method ◽  
Voltage Source ◽  
Pwm Rectifier ◽  
Phase Voltage ◽  
Three Phase ◽  
Dc Bus ◽  
Bus Voltage

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

scholarly journals A Full-bridge Director Switches based Multilevel Converter with DC Fault Blocking Capability and Its Predictive Control Strategy

Energies ◽  
2018 ◽  
Vol 12 (1) ◽  
pp. 91 ◽  
Author(s):  
Jin Zhu ◽  
Tongzhen Wei ◽  
Qunhai Huo ◽  
Jingyuan Yin
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Control Method ◽  
Experimental Studies ◽  
Low Frequency ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Multilevel Converter ◽  
High Voltage Direct Current ◽  
Dc Fault

Voltage source converter-based high-voltage direct current transmission system (VSC-HVDC) technology has been widely used. However, traditional half-bridge sub module (HBSM)-based module multilevel converter (MMC) cannot block a DC fault current. This paper proposes that a full-bridge director switches based multi-level converter can offer features such as DC side fault blocking capability and is more compact and lower cost than other existing MMC topologies. A suitable predictive control strategy is proposed to minimize the error of the output AC current and the capacitor voltage of the sub-module while the director switches are operated in low-frequency mode. The validity of the proposed topology and control method is demonstrated based on simulation and experimental studies.

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