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Multilevel converters-a new breed of power converters

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2 Author(s)
Jih-Sheng Lai ; Div. of Eng. Technol., Oak Ridge Nat. Lab., TN, USA ; Fang Zheng Peng

Multilevel voltage source converters are emerging as a new breed of power converter options for high-power applications. The multilevel voltage source converters typically synthesize the staircase voltage wave from several levels of DC capacitor voltages. One of the major limitations of the multilevel converters is the voltage unbalance between different levels. The techniques to balance the voltage between different levels normally involve voltage clamping or capacitor charge control. There are several ways of implementing voltage balance in multilevel converters. Without considering the traditional magnetic coupled converters, this paper presents three recently developed multilevel voltage source converters: (1) diode-clamp, (2) flying-capacitors, and (3) cascaded-inverters with separate DC sources. The operating principle, features, constraints, and potential applications of these converters are discussed

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Industry Applications, IEEE Transactions on  (Volume:32 ,  Issue: 3 )