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Implementation and control of distributed PWM cascaded multilevel inverters with minimal harmonic distortion and common-mode voltage

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3 Author(s)
Poh Chiang Loh ; Center for Adv. Power Electron., Nanyang Technol. Univ., Singapore ; Holmes, D.G. ; Lipo, T.A.

Cascaded multilevel inverters can be implemented through the series connection of single-phase modular power bridges. This work presents details on how these bridges should be implemented and operated to synchronize their pulse-width-modulation (PWM) carriers, fundamental references and sampling instances to implement a network-controlled cascaded inverter with distributed PWM computation and overall optimal system performance. The paper begins by detailing the development and control of an integrated power bridge, designed with its own digital signal processor and associated control circuitry. Details describing the networked control algorithm and signal protocol needed for synchronizing the multiple power bridges through a dynamically fast data communication network, are then presented to achieve optimum harmonic cancellation and reduced common-mode voltage. The practicality and performance of the presented modular implementation concepts have been confirmed through the close match between simulation and experimental results obtained using a modular cascaded five-level inverter prototype.

Published in:

Power Electronics, IEEE Transactions on  (Volume:20 ,  Issue: 1 )

Date of Publication:

Jan. 2005

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