Evaluation of a grid‐connected reduced‐component boost multilevel inverter (BMLI) topology

Abstract

In this paper, a reduced‐component switched‐capacitor boost multilevel inverter (SC‐BMLI) topology is proposed for off‐grid and on‐grid applications. Recently, switched‐capacitor‐based multilevel inverter (MLI) topologies have been employed to avoid the need for multiple isolated direct current (DC) sources when compared with traditional cascaded MLIs. To generate a nine‐level stepped‐up voltage across the load, the SC‐BMLI needs only eight power switches and two capacitors. To get the appropriate nine‐level switching pattern, phase disposition pulse width modulation (PD‐PWM) has been used. An extended 13‐level boost multilevel inverter (BMLI) is also discussed in this paper. The proposed topology is connected to the grid to control the grid current using synchronous reference frame‐based proportional–integral controller. A small‐signal modeling and analysis has been discussed in detail for the phase‐locked‐loop (PLL). Moreover, to prove the superior performance of the SC‐BMLI, comparative analysis with an existing single DC source MLI has also been performed. The feasibility of the 9‐level and 13‐level proposed topologies, with and without the grid‐connection, is evaluated by Matlab/Simulink simulation and verified by an experimental study using the OPAL‐RT 4510 real‐time platform. Further, prototype model of nine‐level BMLI has been developed in the laboratory using DSpace 1103 controller and results are compared with simulation.

A novel step‐up topology for multilevel power conversion

“…15 As having a high gain in the seven-level inverter, 15 TSV increases resultant CF is high. Topologies [16][17][18][19][20] are operated as nine-level where the Jagabar Sathik et al 16 required a low number of all parameters but required two input sources resulting in high CF. The maximum possible boosting factor of these topologies is 3 with a high value of CF as compared to the proposed work.…”

“…The gain for Sarwer et al 15 is 3, but this topology required a high number of switches. Topologies 16–20 are operated as nine‐level inverters where only Jagabar Sathik et al 16 has high voltage gain of 3 while others have a voltage gain of 2. Moreover, the topology Jagabar Sathik et al 16 required 2 isolated sources, which increases the cost of the inverter.…”

“…Proposed SC-MLI worked in an asymmetric charging state and uses only three capacitors. The topologies [13][14][15][16][17][18][19][20][21][22][23][24][25][26][27][28][29] generate different voltage levels and use single or multiple DC sources. Topologies [13][14][15] are operated with seven-level, where previous works 13,14 have the gain of 1.5.…”

A double boost 9‐level switched capacitor‐based multilevel inverter for photovoltaic applications

“…Topology of Sathik et al 34 has two input sources due to which its cost function increases and also has high total harmonic distortion (THD) in output current. In Shiva Naik et al and Debela et al, 35,36 components required to produce 9-level are high which increases it cost. Moreover, in other topologies, 31,33 THD in output voltage and current are also high, due to which filter size increase in the system.…”

Implementation of hardware‐in‐loop for DC‐link voltage balancing in hybrid ac/dc microgrid using interlinking converter

“…The main disadvantages of these converters are their low efficacy compared with MLC's and significant power dissipation at high switching frequencies 16 . MLC's 17,18 have enticing characteristics of high system performance at high power quality and certain switching frequencies, making them a suitable alternative for the aforementioned applications 19 . MLC's, on the other hand, face significant challenges in large‐scale production due to its higher semiconductor count 20 …”