The simplified topology of three-phase SST based on 15kV SIC devices and the control strategy under unbalanced grid voltage

2016 ◽  
Author(s):  
Chenghao Yu ◽  
Yubin Wang ◽  
Houzhi Li
Keyword(s):  
Control Strategy ◽  
Grid Voltage ◽  
Three Phase ◽  
Unbalanced Grid

Current predictive control of three-phase voltage source PWM rectifiers under unbalanced grid voltage conditions

2016 ◽  
Vol 39 (7) ◽  
pp. 976-986
Author(s):  
Meng Wang ◽  
Yanyan Shi ◽  
Zhen Qi ◽  
Minghui Shen
Keyword(s):  
Predictive Control ◽  
Control Strategy ◽  
Voltage Source ◽  
Phase Voltage ◽  
Two Phase ◽  
Grid Voltage ◽  
Three Phase ◽  
Pwm Rectifiers ◽  
Current Error ◽  
Unbalanced Grid

To improve the performance of three-phase voltage source pulse-width modulated (PWM) rectifiers (VSR) under unbalanced grid voltage conditions, a fixed-frequency current predictive control (CPC) strategy is presented. Instantaneous power of the three-phase VSR is analysed in a two-phase stationary frame. The calculation method for the reference current is improved to achieve the power stability at the AC side of the rectifier. Based on the current predictive model, the optimal duration of the voltage vectors is computed under the restricted condition of minimizing current error at α- and β-axes in fixed intervals. The control system is free of synchronous rotation coordinate transformation, and avoids positive and negative sequence decomposition, which simplifies the calculation. The simulation and experimental results show that the proposed control strategy is able to eliminate the AC current distortion effectively and depress DC link voltage fluctuation under unbalanced grid voltage. Furthermore, the control strategy has faster dynamic response ability, enhancing the control performance of the three-phase VSR system.

scholarly journals A compound control strategy of three‐phase Vienna rectifier under unbalanced grid voltage

2021 ◽  
Author(s):  
Xingtian Feng ◽  
Yongming Sun ◽  
Xiao Cui ◽  
Wenzhong Ma ◽  
Yubin Wang
Keyword(s):  
Control Strategy ◽  
Grid Voltage ◽  
Compound Control ◽  
Vienna Rectifier ◽  
Three Phase ◽  
Unbalanced Grid

Modified Power Compensation Control Strategy of Three-Phase Grid-Connected Inverter under Unbalanced Grid Voltage Conditions

2015 ◽  
Vol 740 ◽  
pp. 335-338 ◽  
Author(s):  
Shao Hua Sun ◽  
Hong Qi Ben
Keyword(s):  
Control Strategy ◽  
Reactive Power ◽  
Positive Sequence ◽  
Grid Voltage ◽  
Compensation Control ◽  
Active And Reactive Power ◽  
Three Phase ◽  
Grid Connected Inverter ◽  
Three Phase Inverter ◽  
Unbalanced Grid

Control strategy under unbalanced grid voltage conditions is one of the most important issues for grid-connected inverter. Under unbalanced grid voltage conditions, the 2nd active and reactive power ripples generate, they pollute the grid. To meet the demands of IEEE Std.929-2000, this paper proposed a modified power compensation control strategy; the proposed solution is based on direct power control. To provide accurate compensating power, the power model of three-phase inverter under unbalanced grid voltage conditions is given, using the positive sequence current component and the negative sequence voltage component, the compensating powers are calculated in details. Theoretical analysis and comparative simulation verification are presented to demonstrate the effectiveness of the proposed control strategy.

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
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