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Sequential Switching Hybrid Single-carrier Sinusoidal Modulation for Cascaded Multi-level Inverter

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This article presents a generalized hybrid single-carrier sinusoidal modulation control for cascaded multi-level inverters. This scheme combines the features of fundamental frequency modulation and single-carrier sinusoidal modulation strategies. The main characteristic of this modulation is the reduction of switching losses with better harmonic performance. A sequential switching scheme is embedded in this hybrid modulation to overcome differential heating among the power devices. Single-carrier sinusoidal modulation and its base modulation design are implemented on a TMS320F2407 digital signal processor. A complex programmable logic device realizes a hybrid pulse width modulation algorithm, and it is integrated with a digital signal processor for hybrid single-carrier sinusoidal modulation generation. The feasibility of this hybrid modulation is verified by spectral analysis, power loss analysis, simulation and experimental results.

Keywords: cascaded multi-level inverter; digital signal processor; hybrid modulation; power loss analysis; single-carrier sinusoidal modulation; weighted total harmonic distortion

Document Type: Research Article

DOI: http://dx.doi.org/10.1080/15325008.2010.528531

Affiliations: 1: Department of Electrical and Electronics Engineering, Government College of Engineering, Salem, India 2: Department of Computer Science and Engineering, Government College of Technology, Coimbatore, India

Publication date: January 1, 2011

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