ABSTRACT:
In this paper, a new topology of two-stage cascaded switched-diode
(CSD) multilevel inverter is proposed for medium voltage renewable energy
integration. First, it aims to reduce the number of switches along with its
gate drivers. Thus, the installation space and cost of a multilevel inverter
are reduced. The spike removal switch added in the first stage of the inverter
provides a flowing path for the reverse load current, and as a result, high
voltage spikes occurring at the base of the stepped output voltage based upon
conventional CSD multilevel inverter topologies are removed. Moreover, to
resolve the problems related to dc source fluctuations of multilevel inverter
used for renewable energy integration, the clock phase-shifting (CPS) one-cycle
control (OCC) is developed to control the two-stage CSD multilevel inverter. By
shifting the clock pulse phase of every cascaded unit, the staircase-like
output voltage waveforms are obtained and a strong suppression ability against fluctuations
in dc sources is achieved. Simulation and experimental results are discussed to
verify the feasibility and performances of the two-stage CSD multilevel
inverter controlled by the CPS OCC method.
KEYWORDS:
1.
Novel cascaded
multilevel inverter
2.
Two-stage
3.
One-cycle
control
SOFTWARE: MATLAB/SIMULINK
CONCLUSION:
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