Open AccessGrid integration of modular multilevel inverter with improved performance parameters
Author(s) -
Shunmugham Vanaja Dishore,
Stonier Albert Alexander
Publication year - 2021
Publication title -
international transactions on electrical energy systems
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 42
ISSN - 2050-7038
DOI - 10.1002/2050-7038.12667
Subject(s) - modular design , computer science , inverter , grid , electronic engineering , electrical engineering , engineering , mathematics , voltage , operating system , geometry
Summary This study aims to propose a novel effective modular multilevel inverter (MMI) with improved performance parameters. The improved performance parameters are switch reduction, harmonic reduction, and grid synchronization. The reductive design of MMI includes three bidirectional switches and eight unilateral switches to generate a symmetrical nine‐level output, while the same configuration can create a 11, 13, 15, 17, 19, 21, 23, 25, 27, 29, and 31‐level output with asymmetric DC sources. The developed structure requires H‐bride for the generation of positive and negative levels. Reduction in switch count reduces the losses of the MMI and increases the efficiency of the MMI. The selective harmonic elimination technique gives pulses to the proposed design and for the computation of switching angles, Harris hawk's optimization (HHO) is used. Moreover, as an application point of view, the proposed photovoltaic (PV) fed MMI is connected to the grid. A closed‐loop control system is implemented for the PV fed MMI in which the gains of the PI controllers are tuned using the particle swarm optimization, firefly, and HHO‐based controller. The proposed system is simulated and experimentally validated on a laboratory prototype of PV (1 kWp) grid‐connected MMI. The performance of the proposed structure under steady‐state and dynamic conditions are investigated using simulation and experimental setup.