Grid Interconnection of PV System Using Symmetric and Asymmetric MLI Topology

Abstract

<span lang="EN-US">Generally, PV cell converts sunlight into electricity in the form of dc. Integration of PV system with the existing grid requires dc-ac conversion. This conversion is possible with the help of a dc-ac converter known as an inverter. Among all types of the inverter, multilevel inverters (MLIs) are playing a major role with all their major privileges like High power quality, low distortion, less blocking voltages for switching devices. Conventional multilevel inverter topologies such as diode clamped, flying capacitor and cascaded MLIs are having so many disadvantages. One of the common disadvantage among all the conventional MLIs is the requirement of more number of power electronic components as the level of the output voltage increase. To reduce the power electronic components this paper proposes a multilevel inverter topology in symmetrical and asymmetrical configuration. The proposed MLI uses 12 switches and 19 diodes which are very less compared to conventional MLI topologies for generates nine and thirteen level output voltages. Comparison between presented MLI topology and conventional MLI topologies is presented in this paper. Finally, the proposed MLI whose input is fed from the PV system is integrated into the grid. The proposed concept is validated by using the MATLAB/SIMULINK software and the appropriate results are presented in this paper.</span>

Reduced switched seven level multilevel inverter by modified carrier for high voltage industrial applications

“…Previous research [15]- [17] compares conventional and unique pulse width modulation (PWM) for CMLI and t-type MLI. Prasadarao and Manohar [18] investigate PV-based symmetric and asymmetric MLI. Pretraining for the consequences of decreasing switching MLIs is included in [19].…”

Real-time switching thirteen-level modified CHB-Multilevel inverter using artificial neural network technique based on selective harmonic elimination

“…Majority of these renewable sources produce a DC power waveform as an output which are not suitable for the power transmission, distribution and utilization purposes. Based on that, the produced DC power should be firstly converted into an AC power waveform and that can be realized by using a multilevel inverter (MLI) circuit [2][3][4][5]. In general, the building structure of the MLI can be classified into three main topologies based on the principle structure, known as flying capacitor MLI (FC-MLI), diode-clamped MLI (DC-MLI), and finally the cascaded h-bridge MLI (CHB-MLI) which is the most popular and more reliable.…”

Asymmetric hybrid multilevel inverter with reduced harmonic using hybrid modulation technique

“…The symmetrical topology has equal voltage source and required more DC source and H-bridge inverter. Asymmetrical topology has unequal voltage source and less no of DC sources and H-bridge compare than symmetrical method [12][13][14][15][16][17][18].…”