scholarly journals Modulation Technique for Modified Active Quasi-Z-Source Inverter with Common-Mode Voltage Reduction

Electronics ◽  
2021 ◽  
Vol 10 (23) ◽  
pp. 2968
Author(s):  
Minh-Khai Nguyen ◽  
Youn-Ok Choi
Keyword(s):  
Pulse Width Modulation ◽  
High Amplitude ◽  
Modulation Index ◽  
Switching Loss ◽  
Space Vector ◽  
Common Mode ◽  
Common Mode Voltage ◽  
High Modulation ◽  
New Space ◽  
Vector Modulation

In Z-source topologies, a high-amplitude common-mode voltage can occur when shoot-through states are inserted. In this study, a new space vector pulse-width modulation for an active quasi-Z-source topology is proposed to operate at a high modulation index and reduce the common-mode voltage to one-third of the DC-link voltage. Moreover, the quality of the output voltage is improved by operation with a high modulation index and decreasing the switching loss of the H-bridge switches. The detailed operating principles of the active quasi-Z-source topology using the proposed space vector modulation (SVM) method are presented. A simulation model was built, and an experimental prototype was verified to correct the theoretical analysis.

scholarly journals Improved Synchronized Space Vector PWM Strategy for Three-Level Inverter at Low Modulation Index

Electronics ◽  
2019 ◽  
Vol 8 (12) ◽  
pp. 1400
Author(s):  
Xin Gu ◽  
Bingxu Wei ◽  
Guozheng Zhang ◽  
Zhiqiang Wang ◽  
Wei Chen
Keyword(s):  
Modulation Index ◽  
Voltage Amplitude ◽  
Switching Loss ◽  
Space Vector Pwm ◽  
Space Vector ◽  
Common Mode ◽  
Medium Voltage ◽  
Common Mode Voltage ◽  
The Common ◽  
Switching State

Aimed at reducing the switching loss and common-mode voltage amplitude of high-power medium-voltage three-level inverter under low modulation index conditions, an improved synchronous space vector PWM strategy is proposed in this paper. The switching times in each fundamental period are reduced by the re-division of small regions and the full use of the redundant switching state. The sum of switching algebra is introduced as an evaluation index and the switching state with the minimum value of the sum of switching algebra are adopted. Then, the common mode voltage amplitude is reduced. The theoretical analysis and experimental results show that the improved modulation strategy proposed in this paper can effectively reduce the switching loss and common-mode voltage amplitude of the inverter under the condition of the low modulation index. Moreover, the neutral-point voltage ripple is also reduced simultaneously.

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