Abstract
Quasi Z-Source Hybrid Modular Multilevel converter controlled by Reduced Inserted Cells Modulation Technique for Medium Voltage Applications
Highlights
This Green energy sources together with electrification of transport are attracting a great attention worldwide in an attempt to reduce the carbon dioxide emission
To adapt reduced inserted cells (RICs) for the three-phase converter, a half of SMs in each arm needs to be replaced by FBSMs in order to compensate for the distortion in the output voltage caused by RIC
It is noted that the switching harmonics of the output voltages appear as sideband clusters of the carrier frequency where the most dominant harmonic cluster is located at twice the carrier frequency (4 kHz)
Summary
This Green energy sources together with electrification of transport are attracting a great attention worldwide in an attempt to reduce the carbon dioxide emission. This paper proposes the three-phase quasi Z-source hybrid modular multilevel converter (qZS-HMMC) with a ratio 1:1 of HBSMs and FBSMs. The operation principle of the proposed configuration with the RICs technique is presented. The operation of the qZS requires the introduction of short circuit (shoot-through) at its output terminals in order to increase currents and the energy stored in the qZS-network inductors which is later transferred to the qZSnetwork capacitors. This stored energy provides the voltage boosting capability [17]. Turning on any of the chain-link switches SU or SN causes distortion in the output voltage which needs to be corrected by the SMs of the MMC stage using a suitable modulation technique and this will be further investigated
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