Performance improvement of Predictive Direct Power Control of a PWM rectifier based on virtual flux under unbalanced grid voltage

2018 ◽  
Author(s):  
Mohammad Amirkafi ◽  
Javad Shokrollahi Moghani ◽  
Alireza Khoshsaadat
Keyword(s):  
Power Control ◽  
Performance Improvement ◽  
Pwm Rectifier ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Virtual Flux ◽  
Unbalanced Grid

A direct power control strategy for three level neutral-point-clamped rectifier under unbalanced grid voltage

2018 ◽  
Vol 161 ◽  
pp. 103-113 ◽  
Author(s):  
Billel Kahia ◽  
Abdelouahab Bouafia ◽  
Abdelmadjid Chaoui ◽  
Zhenbin Zhang ◽  
Mohamed Abdelrahem ◽  
...  
Keyword(s):  
Power Control ◽  
Control Strategy ◽  
Neutral Point ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Unbalanced Grid

scholarly journals An Analysis of Virtual Flux Direct Power Control of Three-Phase AC-DC Converter

2018 ◽  
Vol 9 (3) ◽  
pp. 947 ◽  
Author(s):  
Nor Azizah Mohd Yusoff ◽  
Azziddin M. Razali ◽  
Kasrul Abdul Karim ◽  
Auzani Jidin ◽  
Tole Sutikno
Keyword(s):  
Steady State ◽  
Power Control ◽  
Output Voltage ◽  
Pulse Width Modulation ◽  
Dynamic Performance ◽  
Direct Power ◽  
Direct Power Control ◽  
Grid Voltage ◽  
Three Phase ◽  
Virtual Flux

<p>This paper presents an analysis of virtual-flux direct power control (VFDPC) technique for the three-phase pulse width modulation (PWM) ac-dc converter. The proposed VFDPC is developed by assuming the grid voltage and converter line filters quantities are related to a virtual three-phase ac motor. The controller works with less number of sensors by eliminating the voltage sensors used for measuring the three-phase grid voltage. The grid virtual flux which is proportional to the grid voltage will be estimated from the information of converter switching states, line current, and dc-link output voltage. Several analyses are performed in order to study the steady state and dynamic performance of the converter, particularly during the load and DC voltage output reference variations. The proportional integral (PI) controller at the outer voltage control loop of VFDPC is tuned properly and the entire PWM ac-dc converter system is simulated using MATLAB/Simulink to ensure the dc output voltage follow the desired output voltage under steady state and dynamic conditions. Ac-dc converter utilizing the proposed VFDPC is able to generate three-phase input current waveforms that are almost sinusoidal with low harmonics contents which is less than 5% and near unity power factor (<em>pf</em>) operation.</p>

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