Voltage Balancing and Fluctuation-Suppression Methods of Floating Capacitors in a New Modular Multilevel Converter

By Kui Wang, Yongdong Li, Zedong Zheng, Lie Xu. IEEE transactions on industrial electronics (1982. Print), 2013

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A Step-Up Switched-Capacitor Multilevel Inverter With Self-Voltage Balancing (2014, neutral): “in both neutral-point-clamped and capacitor-clamped inverters [12]–[14].”
Circulating Current Injection Methods Based on Instantaneous Information for the Modular Multilevel Converter (2015, methodology): “This is why the method in [13]–[15] is especially interesting for motor drive applications when the motor operates at a low speed/frequency, but it is not convenient for gridconnected applications.”
A Generalized Power Control Approach in ABC Frame for Modular Multilevel Converter HVDC Links Based on Mathematical Optimization (2014, background): “Previous work [18], [24] proposed a solution where a specific current component at twice the grid fundamental frequency is added to the differential current in order to reduce voltage oscillations.”
A New General Topology for Cascaded Multilevel Inverters With Reduced Number of Components Based on Developed H-Bridge (2014, neutral): “I. INTRODUCTION NOWADAYS, multilevel inverters have received more at-tention for their ability on high-power and mediumvoltage operation and because of other advantages such as high power quality, lower order harmonics, lower switching losses, and better electromagnetic interference [1], [2].”