Carrier based PWM for reduced capacitor voltage ripple in three-phase three-switch buck-type rectifier system

2017 ◽  
Author(s):  
Beomseok Chae ◽  
Yongsug Suh ◽  
Tahyun Kang
Keyword(s):  
Voltage Ripple ◽  
Three Phase ◽  
Capacitor Voltage

scholarly journals Modeling and Mitigation Control of the Submodule-Capacitor Voltage Ripple of a Modular Multilevel Converter under Unbalanced Grid Conditions

Energies ◽  
2021 ◽  
Vol 14 (3) ◽  
pp. 651
Author(s):  
Songda Wang ◽  
Danyang Bao ◽  
Gustavo Gontijo ◽  
Sanjay Chaudhary ◽  
Remus Teodorescu
Keyword(s):  
Analytical Description ◽  
Analytical Tool ◽  
Current Profile ◽  
Voltage Ripple ◽  
Three Phase ◽  
Capacitor Voltage ◽  
Powerful Analytical Tool ◽  
Zero Sequence ◽  
The Right ◽  
Unbalanced Grid

A modular multilevel converter’s (MMC’s) submodule (SM)-capacitor voltage will increase under unbalanced grid conditions. Depending on the imbalance level, the voltage ripple can be considerably high, and it can exceed the pre-defined safe limits. If this occurs, the converter will trip, which can lead to serious stability problems for the grid. This paper first proposes an analytical solution for deriving the three-phase imbalanced SM ripple of an MMC under an unbalanced grid. With this analytical tool, the imbalance mechanism of the SM voltage ripple can be easily understood. What is more, the symmetrical component method is first applied to analyze the three-phase SM capacitor ripple, and the positive-/negative-/zero-sequence components of the three-phase SM voltage ripple are easily identified by the proposed analytical method. Then, based on this powerful analytical tool, the proper circulating-current profile to be injected can be obtained, allowing for the right compensation of the voltage ripple. Based on this approach, two new voltage ripple compensation methods are proposed in this paper. Simulations were carried out to validate the analytical description of the submodule-capacitor voltage ripple proposed in this paper. Moreover, simulation and experimental results are provided to validate the new compensation techniques introduced in this paper.

scholarly journals Capacitors Voltage Switching Ripple in Three-Phase Three-Level Neutral Point Clamped Inverters with Self-Balancing Carrier-Based Modulation

Energies ◽  
2018 ◽  
Vol 11 (12) ◽  
pp. 3244 ◽  
Author(s):  
Manel Hammami ◽  
Gabriele Rizzoli ◽  
Riccardo Mandrioli ◽  
Gabriele Grandi
Keyword(s):  
Experimental Tests ◽  
Neutral Point ◽  
Grid Connection ◽  
Voltage Ripple ◽  
Three Phase ◽  
Capacitor Voltage ◽  
Sinusoidal Load ◽  
Almost All ◽  
Current Ripple ◽  
Voltage Switching

This paper provides a comprehensive analysis of the capacitors voltage switching ripple for three-phase three-level neutral point clamped (NPC) inverter topologies. The voltage ripple amplitudes of the two dc-link capacitors are theoretically estimated as a function of both amplitude and phase angle of output current and the inverter modulation index. In particular, peak-to-peak distribution and maximum amplitudes of the capacitor voltage switching ripple over the fundamental period are obtained. A comparison is made considering different carrier-based pulse-width modulations in the case of almost all sinusoidal load currents, representing either grid connection or passive load with a negligible current ripple. Based on the voltage switching ripple requirements of capacitors, a simple and effective original equation for a preliminary sizing of the capacitors has been proposed. Numerical simulations and experimental tests have been carried out in order to verify the analytical developments.

scholarly journals Capacitor Voltage Ripple Minimization of a Modular Three-Phase AC/DC Power Electronics Transformer With Four-Winding Power Channel

IEEE Access ◽  
2020 ◽  
Vol 8 ◽  
pp. 119594-119608
Author(s):  
Xiaohui Li ◽  
Linqian Cheng ◽  
Liqun He ◽  
Zhongkui Zhu ◽  
Yong Yang ◽  
...  
Keyword(s):  
Power Electronics ◽  
Dc Power ◽  
Voltage Ripple ◽  
Three Phase ◽  
Capacitor Voltage ◽  
Power Channel
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