In this paper, a multilevel current-source inverter (MCSI) topology is analyzed. The issue of constructing a novel modular single-rating inductor MCSI is explored, taking advantage of the features of field-programmable gate arrays (FPGA) for control and gate signal generation. The proposed topology is built with identical modules where all inductors carry the same amount of current, simplifying the construction and operation of industrial applications with higher efficiency. A new statemachine approach, which is easy to implement in an FPGA, and a proper implementation of the phase-shifted carrier sinusoidal pulse width modulation (PSC-SPWM) allow both current balance in all modules and effective switching-frequency minimization.
The performance of the MSCI proposed is simulated with Matlab and is verified by constructing a prototype.Index Terms-Field-programmable gate array (FPGA), multilevel current-source inverter (MCSI), phase-shifted carrier SPWM (PSC-SPWM).
This paper explores the issue of constructing a multilevel current source converter (MCSI) topology with fault tolerant capabilities. A novel modular single rating inductor MCSI topology is analyzed. The MCSI proposed is made by identical modules where all inductors carry the same amount of current. The current balance is achieved by a Phase-Shifted Carrier SPWM proper implementation. A new state machine approach, easy to implement on a FPGA, allows minimizing switching frequency by taking advantage of the three different zero-states of the topology. A protection circuit is proposed to avoid over voltages in case of a failure. The performance of a seven level, four modules, fault tolerant arrangement is analyzed and is thoroughly simulated with Matlab Simulink.
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