scholarly journals Neutral point potential balancing method for three-level power converters in two-stage three-phase four-wire power conversion system

2020 ◽  
Vol 13 (12) ◽  
pp. 2618-2627
Author(s):  
Li Guo ◽  
Rui Liu ◽  
Xialin Li ◽  
Yun Zhang
Keyword(s):  
Power Converters ◽  
Power Conversion ◽  
Neutral Point ◽  
Two Stage ◽  
Point Potential ◽  
Three Phase ◽  
Conversion System

Optimal operation of Low Cost Topology for Improving the Power Quality in the Wind Power Conversion System

2016 ◽  
Vol 1 (3) ◽  
pp. 523
Author(s):  
E Vani ◽  
N Rengarajan
Keyword(s):  
Wind Power ◽  
Power Quality ◽  
Power Conversion ◽  
Optimal Operation ◽  
Grid System ◽  
High Quality ◽  
Dc Voltage ◽  
Vienna Rectifier ◽  
Three Phase ◽  
Conversion System

<p class="Default">In this paper, Vienna rectifier and Z Source Inverter (ZSI) based Wind Power Conversion System (WPCS) has been proposed with less number of switches to provide high quality power to off grid system.  The three phase full bridge converter has six switches for the conversion of AC-DC and also need separate DC-DC boost converter to boost the DC voltage. In the proposed WPCS, three Phase Vienna rectifier has only three switches for the conversion of AC-DC and also it boosts the DC voltage. The ZSI jointly with Vienna rectifier provides higher, boosted AC voltage and high quality power to the off grid system. The ZSI utilizes the shoot-through states to boost the DC link voltage and also, reduces the Electromagnetic Interference (EMI) noise. The combination of Vienna rectifier and Z source inverter shows the good performance which improves the efficiency and reduces Total Harmonic Distortion (THD). The performance of the proposed system is simulated using MATLAB/Simulink software. Simulation and experimental results expose that, this configuration is beneficial with respect to power quality improvement with less number of switches compared to a conventional converter.</p>

scholarly journals Analysis of Three Phase 3-Level NPC Voltage Source Converter for AC-DC Conversion

2020 ◽  
Vol 06 (09) ◽  
pp. 144-148
Author(s):  
A Divya Teja and Dr. N Sambasiva Rao
Keyword(s):  
Power Quality ◽  
Power Flow ◽  
Reactive Power ◽  
Neutral Point ◽  
Voltage Source ◽  
Voltage Source Converter ◽  
Phase 3 ◽  
Control Techniques ◽  
Point Potential ◽  
Three Phase

The use of power electronic converters influences the generation of harmonics and reactive power flow in power system. Therefore, three-phase multilevel improved power quality AC-DC converters are gaining lot of popularity in power conversion applications. This work deals with critical problem of multilevel structure i.e neutral point potential (NPP) variation. In this paper, a simplified current controlled scheme is presented to ensure unity power factor operation. Neutral point potential (NPP) of three-phase, 3-level NPC AC-DC converter is controlled by modifying control signal in the controller using NPP regulator. An auxiliary circuit is being presented in this paper as an alternative option for controlling the neutral point potential of the converter. Comparison has been carried out between these control techniques in terms of power quality. A complete mathematical model is presented for better understanding of both techniques used for NPP control. The presented control techniques has been verified through simulation investigations and validated

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