Single‐phase boost DC‐link integrated cascaded multilevel inverter for PV applications

Abstract

This study presents a new boost DC-link integrated multilevel inverter (BDIMLI) topology for single-phase stand-alone photovoltaic applications. The BDIMLI is realised by the integration of two two-level boost DC-link converters (TBDCs) with a hybrid H-bridge inverter using symmetrical voltage sources. Conventional cascaded multilevel inverters require a large number of isolated DC source and circuit components. On the other side, switched capacitor multilevel inverter topologies require less number of sources and components, but need bulky capacitors. The proposed TBDC units charge the capacitors to the desired voltage with the high switching frequency, hence require less capacitance and component count. The proposed topology with proper selection of capacitor voltage levels can produce 9-, 11-and 13-level outputs without altering any circuit components. Besides, the proposed topology produces low-frequency common-mode voltage. The comprehensive analysis of BDIMLI in comparison with recent multilevel inverter topologies is presented. An experimental prototype of BDIMLI is built and its dynamic behaviour with different load conditions is presented for both 9-and 13-level operations.

A New Hybrid Cascaded Switched-Capacitor Reduced Switch Multilevel Inverter for Renewable Sources and Domestic Loads

“…Thus, due to the stepped voltage level, which is DC in the corresponding time interval, and RL XL, the inductance may be neglected. As a result, the current of one-step voltage will be approximately equal to: Inpk, obtained from (46), is the current one-level output voltage of the power supply for the load of 5 Ω. As the load changes, the magnitude of the current also changes.…”

A new generalized floor function based high switching frequency modulation and control technique: Multilevel inverters

“…The topology 15 also gives more value of TSV pu since the inclusion of back-end H-Bridge. The topologies [16][17][18] produces 9-levels but the value of TSV pu is more. To generate 9-levels, the topology 19 needs 16-unidirectional switches, and thereby 16 gate driver circuits and protection circuits are additionally needed.…”

Energy efficiency evaluation of a three-phase extendable-level inverter

“…The classical MLI topologies for industrial motor drives were presented by Rodriguez et al [3]. The necessity for a large component count and control complexity plagued traditional MLIs [4][5][6]. Recently reduced switch MLI topologies for various applications were presented [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24][25][26].…”