Compatible FPGA implementation of capacitor voltage balance control for half-bridge and full-bridge modular multilevel converter

2015 ◽  
Author(s):  
Wei Li
Keyword(s):  
Balance Control ◽  
Fpga Implementation ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Voltage Balance Control ◽  
Capacitor Voltage Balance

scholarly journals A Novel Z-Type Self-Balancing Modular Multilevel Converter for Flywheel Driving Applications

2021 ◽  
Vol 271 ◽  
pp. 01025
Author(s):  
Shuoqi Cheng ◽  
Tong Zheng ◽  
Congzhe Gao ◽  
Jingliang Lv ◽  
Xinjian Jiang
Keyword(s):  
Wide Frequency Range ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Variable Frequency Drive ◽  
Medium Voltage ◽  
Circulating Current ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Current Characteristics ◽  
Capacitor Voltage Balance

With the development of flywheel technology, the speed and the voltage level of flywheel continue to increase. The Z-type self-balancing modular multilevel converter can have a wide frequency range at medium voltage and is suitable for flywheel driving application. However, the voltage and current characteristics of the flywheel and the variable frequency drive still affect capacitor voltage balance in each phase-leg. The new balance of capacitor voltage can be achieved by controlling the circulating current. This paper proposed a control algorithm of the novel Z-type self-balancing modular multilevel converter for flywheel driving applications. Simulation results are presented to validate the theoretical analysis.

A Novel STATCOM Based on Flying Capacitor Modular Multilevel Converter

2018 ◽  
Vol 6 (11) ◽  
pp. 86
Author(s):  
T. Sanjeeva Rao ◽  
T. Sowjanya
Keyword(s):  
Control Method ◽  
Modular Multilevel Converter ◽  
Multilevel Converter ◽  
Static Synchronous Compensator ◽  
Current Compensation ◽  
Negative Sequence ◽  
Capacitor Voltage ◽  
Voltage Balance ◽  
Capacitor Voltage Balance ◽  
Negative Sequence Current

A new static synchronous compensator (STATCOM) based on Flying Capacitor modular multilevel converter (DCM2C) is proposed in this thesis. In this converter topology the capacitor voltage is clamped by using a low power rating diode in each sub-module (SM). The quantity of voltage sensors is significantly reduced and is free from the number of voltage levels. Furthermore the voltage balancing control method becomes very simple and the capacitor voltage balance speed is fast. Based on the structure of MMC the DCM2C-STATCOM has the capability of Var compensation and negative sequence current compensation. The topology characteristics and compensation control method of DCM2C-STATCOM are investigated in this thesis. That the capacitor voltage of the proposed DCM2C-STATCOM can be well balanced and the Var and negative-sequence current compensation are effective.

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