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.

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.

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.

A Power Tracking Control Method for Single-Phase PWM Rectifier

2012 ◽  
Vol 516-517 ◽  
pp. 1893-1896
Author(s):  
Shi Jie Yan ◽  
Wen Zhong Gao ◽  
En Hui Chu
Keyword(s):  
Power Control ◽  
Power Factor ◽  
Tracking Control ◽  
Single Phase ◽  
Reactive Power ◽  
Control Method ◽  
Dynamic Performance ◽  
Pwm Rectifier ◽  
High Power Factor ◽  
Sinusoidal Current

Power control method had been widely used because of its simplicity, good dynamic performance, decoupled active and reactive power control for three-phase PWM rectifier. But it is not adapted to single-phase rectifier as power calculating problem. A power tracking control method is proposed for single-phase PWM rectifier. In new method, voltage and current with harmonics are decomposed of Fourier series. Their fundamental components are only extracted in order to calculate active power and reactive power and track requirement value. So the system not only realizes high power factor, sinusoidal current and stable DC link voltage, but also meet the application demand the capability of power regeneration to the power supply. The results of experiment show that the DC link voltage fluctuations should be minimal and the power factor is high. The proposed method is effective and practicable.

scholarly journals A power quality enhanced for the wind turbine with sensorless direct power control under different input voltage conditions

2021 ◽  
pp. 64-71
Author(s):  
Z.E.Z. Laggoun ◽  
H. Benalla ◽  
K. Nebti
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Electrical Energy ◽  
Input Voltage ◽  
Voltage Sensor ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Active And Reactive Power

Introduction. The quality of electrical energy is essential during disturbances, at the level of power electronic devices will suffer serious operating problems causing dangerous damage. Aim. A new approach to direct power control without grid voltage sensor improves the quality and control of instantaneous active and reactive power converters. Methodology. First, the technique without network voltage sensor with a direct power control based on a switching table, which is a classic approach, is discussed and its performance is analyzed under increasing and decreasing load. In addition, the performance of the proposed technique is also analyzed under the same circumstances and their performance is compared. Originality. The new method consists of a nonlinear grid voltage modulated controller and a conventional controller which guarantees very good results in a polluted network. The proposed method is verified using MATLAB/Simulink. Results. The simulation results under different input voltage conditions show that the proposed method not only has good tracking performance in active and reactive power, but also reduces the current total harmonic distortion to 1.9 %, which is good lower than the requirement for network operation.

scholarly journals Direct Power Control of a Single Stage Current Source Inverter Grid-Tied PV System

Energies ◽  
2020 ◽  
Vol 13 (12) ◽  
pp. 3165
Author(s):  
Erhab Youssef ◽  
Pedro B. C. Costa ◽  
Sonia F. Pinto ◽  
Amr Amin ◽  
Adel A. El Samahy
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Current Source ◽  
Harmonic Distortion ◽  
Time Instant ◽  
Single Stage ◽  
Direct Power ◽  
Pv System ◽  
Current Source Inverter ◽  
Active And Reactive Power

In this paper, a direct power predictive controller (DPPC) is derived for a current source inverter (CSI) based single stage photovoltaic (PV) system. The equations of the dynamics, including AC and DC filters, are formulated directly for the PV power and for the active and reactive power injected in the grid. Then, the prediction equations are synthesized straight for the power, and, at each time instant, the optimal switching vector that guarantees simultaneously the control of the power generated by the PV arrays, and the control of the reactive power in the connection to the grid is chosen. This approach aims to guarantee fast and accurate tracking of the power. The proposed system is then validated through simulation and experimental results, showing that the PV system is able to follow the power references, guaranteeing a fast response to a step in the power, and decoupled active and reactive power control, with minimum total harmonic distortion (<5%) of the currents injected in the grid.

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.

Predictive Direct Power Control (PDPC) of Grid-connected Dual-active Bridge Multilevel Inverter (DABMI)

2017 ◽  
Vol 8 (4) ◽  
pp. 1524 ◽  
Author(s):  
H.H. Goh ◽  
Azuwien Aida ◽  
S.S. Lee ◽  
S.Y. Sim ◽  
K.C. Goh
Keyword(s):  
Power Control ◽  
Reactive Power ◽  
Power Grid ◽  
Harmonic Distortion ◽  
Multilevel Inverter ◽  
Energy Integration ◽  
Direct Power ◽  
Direct Power Control ◽  
Dual Active Bridge ◽  
Model Predictive Control Algorithm

This paper deals with controlling a grid-connected dual-active bridge multilevel inverter for renewable energy integration. The concept of direct power control is integrated with model predictive control algorithm, which is termed as predictive direct power control, to control the real and reactive power injected into the power grid. The proposed multilevel inverter allows more options of feasible voltage vectors for switching vector selections in order to generate multilevel outputs, and thereby obtaining high power quality in the power grid. By using the predictive direct power control, simulation results show that the proposed multilevel inverter produces lower power ripple and manage to achieve currents with low total harmonic distortion which are well within the IEEE standard. The modeling and simulation of the system are implemented and validated by MATLAB Simulink software.

scholarly journals Demodulation of Three-Phase AC Power Transients in the Presence of Harmonic Distortion

Energies ◽  
2020 ◽  
Vol 13 (9) ◽  
pp. 2341
Author(s):  
Benjamin T. Gwynn ◽  
Raymond de Callafon
Keyword(s):  
Power Systems ◽  
Power Flow ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Transient Effects ◽  
Active And Reactive Power ◽  
Reactive Power Flow ◽  
Ac Power ◽  
Rlc Circuit ◽  
Smart Inverters

Load switches in power systems may cause oscillations in active and reactive power flow. Such oscillations can be damped by synthetic inertia provided by smart inverters providing power from DC sources such as photovoltaic or battery storage. However, AC current provided by inverters is inherently non-sinusoidal, making measurements of active and reactive power subject to harmonic distortion. As a result, transient effects due to load switching can be obscured by harmonic distortion. An RLC circuit serves as a reference load. The oscillation caused by switching in the load presents as a dual-sideband suppressed-carrier signal. The carrier frequency is available via voltage data but the phase is not. Given a group of candidate signals formed from phase voltages, an algorithm based on Costas Loop that can quickly quantify the phase difference between each candidate and carrier (thus identifying the best signal for demodulation) is presented. Algorithm functionality is demonstrated in the presence of inverter-induced distortion.

Power Control of Photovoltaic Inverter under Unbalanced Grid Faults Considering Limits of Its Current Harmonics

2014 ◽  
Vol 960-961 ◽  
pp. 1356-1360 ◽  
Author(s):  
Yu Zhou ◽  
Zhi Yong Dai ◽  
Qiang Gang Wang ◽  
Ling Ye ◽  
Nian Cheng Zhou
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Reactive Power ◽  
Harmonic Distortion ◽  
Optimal Parameters ◽  
Current Harmonics ◽  
Power Characteristics ◽  
Active And Reactive Power ◽  
Fluctuation Amplitude ◽  
Unbalanced Grid

This paper studies the instantaneous output power characteristics of photovoltaic inverters and its flexible power control strategy under unbalanced grid faults. Then the optimal parameters model of the power control is established with minimum integrated fluctuation amplitude of the active and reactive power as a goal when the constraint of the output current harmonic distortion of photovoltaic inverters is taken into account. Finally, the optimal power control of photovoltaic inverters based on dead-beat current tracking is realized and the feasibility of the proposed control strategy is verified with the power system transient software PSCAD/EMTDC.

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