Study on 3-Phase PWM Rectifier Controlled by Direct Power

2013 ◽  
Vol 325-326 ◽  
pp. 494-498
Author(s):  
Xuan Gong ◽  
Di Chen Liu ◽  
Fei Fei Dong ◽  
Bo Wang
Keyword(s):  
Reactive Power ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Basic Space ◽  
Instantaneous Power ◽  
New Strategy ◽  
Input Side ◽  
Simulation And Experiment ◽  
Space Vectors ◽  
Switching State

Based on the analysis on shortcomings of controlling strategies of direct power on the traditional 3-phase Boost-type PWM Rectifier through space vectors, a new controlling strategy is proposed in this paper. With this new strategy, the space vector is divided into 12 basic space vectors to form a new switching table. The instantaneous power controlling technology is realized through the control of instantaneous active power and reactive power by choosing the best switching state of PWM Rectifier. This new controlling strategy can put the input side unit power into operation, improve the efficiency of power and reduce harmonics of the input current. The effectiveness and feasibility of this controlling strategy have been justified through the simulation and experiment.

Artificial Neural Network for PWM Rectifier Direct Power Control and DC Voltage Control

2018 ◽  
pp. 286-316 ◽  
Author(s):  
Arezki Fekik ◽  
Hakim Denoun ◽  
Ahmad Taher Azar ◽  
Mustapha Zaouia ◽  
Nabil Benyahia ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Power Control ◽  
Power Factor ◽  
Reactive Power ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Dc Voltage ◽  
Unit Power

In this chapter, a new technique has been proposed for reducing the harmonic content of a three-phase PWM rectifier connected to the networks with a unit power factor and also providing decoupled control of the active and reactive instantaneous power. This technique called direct power control (DPC) is based on artificial neural network (ANN) controller, without line voltage sensors. The control technique is based on well-known direct torque control (DTC) ideas for the induction motor, which is applied to eliminate the harmonic of the line current and compensate for the reactive power. The main idea of this control is based on active and reactive power control loops. The DC voltage capacitor is regulated by the ANN controller to keep it constant and also provides a stable active power exchange. The simulation results are very satisfactory in the terms of stability and total harmonic distortion (THD) of the line current and the unit power factor.

Performance and High Robustness DPC for PWM Rectifier under Unstable Direct Voltage Bus

2016 ◽  
Vol 7 (1) ◽  
pp. 66
Author(s):  
M.S. Djebbar ◽  
H. Benalla
Keyword(s):  
High Voltage ◽  
Power Factor ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Good Control ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Active And Reactive Power ◽  
Sinusoidal Current ◽  
Electric Traction

This paper proposes a strategy de controlling a static AC/DC converter based on direct power control (DPC). The instantaneous active and reactive power   is controlled in such a way to ensure the PWM rectifier with a sinusoidal current absorption. This control has proven effective in terms of reduction of total harmonic distortion (THD) of current absorbed. Offers a good control of active and reactive power with an operation   at unitary power factor. The test of robustness carried out and the results have proven DPC good performance with strong possibility of  de integrate it into the field of high voltage and high power as electric traction.

scholarly journals A new switching look-up table for direct power control of grid connected 3L-NPC PWM rectifier

2021 ◽  
Vol 12 (3) ◽  
pp. 1413
Author(s):  
Azziddin M. Razali ◽  
Nor Azizah Yusoff ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Supply Voltage ◽  
Harmonic Distortion ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Pulse Width Modulated ◽  
Look Up Table ◽  
Dynamic Performances

This paper presents a comprehensive and systematic approach in developing a new switching look-up table for direct power control (DPC) strategy applied to the three-phase grid connected three-level neutral-point clamped (3L-NPC) pulse width modulated (PWM) rectifier. The term of PWM rectifier used in this paper is also known as AC-DC converter. The approach provides detailed information regarding the effects of each multilevel converter space vector to the distribution of input active and reactive power in the converter system. Thus, the most optimal converter space vectors are able to be selected by the switching look-up table, allowing smooth control of the active and reactive powers for each sector. In addition, the proposed DPC utilizes an NPC capacitor balanced strategy to enhance the performance of front-end AC-DC converter during load and supply voltage disturbances. The steady state as well as the dynamic performances of the proposed DPC are presented and analyzed by using MATLAB/Simulink software. The results show that the AC-DC converter utilizing the new look-up table is able to produce almost sinusoidal line currents with lower current total harmonic distortion, unity power factor operation, adjustable DC-link output voltage and good dynamic response during load disturbance.

scholarly journals Improved virtual flux direct power control of three phase PWM rectifier using SOGI-FLL estimator under disturbed voltage conditions

2019 ◽  
Vol 8 (1) ◽  
pp. 34
Author(s):  
A. Rahab ◽  
H Benalla ◽  
F Senani
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Supply Voltage ◽  
Notch Filter ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Three Phase ◽  
Observation Method ◽  
Virtual Flux

In this paper, improved sonsorless direct power control (DPC) of three-phase rectifiers is presented. The new system are based on virtual flux (VF) and notch filter using Second Order Generalized Integrator frequency located loop SOGI-FLL estimator. In order to improve the VF-DPC performance of PWM rectifier, an improved observation method of virtual flux-linkage is proposed. To avoid the relevant problems of pure integrator, and to achieve the accurate observation of the grid voltage’s phase, (SOGI-FLL) are used to displace the pure integrator. Theoretical principles of this method are presented and discussed. These strategies are also investigated under disturbed grid voltage. A theoretical analysis of active and reactive power under a non-ideal source is clearly demonstrated. In order to calculate the compensated powers, the extraction of positive, negative, and harmonic sequences of voltage and current is needed and a multiple dual SOGI-FLL method is used for rapid and accurate extraction. It is shown that the VFDPC with integrating notch filter exhibits several advantages, particularly providing small ripple of DC-link voltage and sinusoidal line current when the supply voltage is not ideal.

Research on the Control of AFE Converter

2014 ◽  
Vol 654 ◽  
pp. 233-237
Author(s):  
Jian Tang ◽  
Yue Nan Zeng ◽  
Lei Zheng ◽  
Jin Hui Liu
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Switching Frequency ◽  
Control Loop ◽  
Direct Power ◽  
Direct Power Control ◽  
Two Phase ◽  
Instantaneous Power ◽  
Sinusoidal Current ◽  
Grid Side

In this paper, a strategy of AFE converter based on direct power control is presented. The AFE converter possesses the merit of sinusoidal current on grid-side, controllable power factor and constant DC voltage, meanwhile, power feedback to the grid can be realized. Firstly, a power control mathematical model of AFE converter in two-phase synchronous rotating coordinate is built, on this basis, adopts the square of voltage control in the outer control loop and limits the slope of the setting voltage to improve the starting performance; then uses power feedforward decoupling control in inner control loop , combines with the instantaneous power theory and uses space vector control algorithm to replace the switch table to solve the problem that switching frequency is not fixed in traditional direct power control. Ultimately realizes the independent control of active and reactive power without decoupling. The experimental results verify the correctness and validity of the proposed control strategy.

Direct Power Controlled Three Phase Boost Type PWM Rectifier Based on Novel Switching Vector Table

2011 ◽  
Vol 308-310 ◽  
pp. 1269-1272
Author(s):  
Guang Ye Li ◽  
Jian Ru Wan ◽  
Ming Shui Li
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Active Power ◽  
Switching Frequency ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Power Fluctuation ◽  
Direct Power Control ◽  
Voltage Vector ◽  
Three Phase

The reactive power is out of control near the fundamental voltage vector in traditional direct power control system, which leads to the current distortion at AC side and the voltage fluctuation at DC side. The mechanisms of the instantaneous active power and the reactive power are analyzed based on the instantaneous power mathematical model of the PWM rectifier. A new direct power control strategy is researched based on novel sector division and novel switching table. This method not only has the advantage of rapid regulation for active power, but also can restrain reactive power fluctuation and reduce switching frequency. Simulative and experimental results verify its feasibility and effectiveness.

Artificial Neural Network for PWM Rectifier Direct Power Control and DC Voltage Control

2022 ◽  
pp. 440-470
Author(s):  
Arezki Fekik ◽  
Hakim Denoun ◽  
Ahmad Taher Azar ◽  
Mustapha Zaouia ◽  
Nabil Benyahia ◽  
...  
Keyword(s):  
Neural Network ◽  
Artificial Neural Network ◽  
Power Control ◽  
Power Factor ◽  
Reactive Power ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Dc Voltage ◽  
Unit Power

In this chapter, a new technique has been proposed for reducing the harmonic content of a three-phase PWM rectifier connected to the networks with a unit power factor and also providing decoupled control of the active and reactive instantaneous power. This technique called direct power control (DPC) is based on artificial neural network (ANN) controller, without line voltage sensors. The control technique is based on well-known direct torque control (DTC) ideas for the induction motor, which is applied to eliminate the harmonic of the line current and compensate for the reactive power. The main idea of this control is based on active and reactive power control loops. The DC voltage capacitor is regulated by the ANN controller to keep it constant and also provides a stable active power exchange. The simulation results are very satisfactory in the terms of stability and total harmonic distortion (THD) of the line current and the unit power factor.

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