1. 21-level 3-phase cascaded h-bridge multi-level inverter with different multi-carrier level shift pwm techniques and their thd analysis
Authors : Velishala Ramu, Dr. P. Satish Kumar, Dr. G.n.sreenivas
Pages : 5-13
DOI : http://dx.doi.org/10.21172/1.83.002
Keywords : multilevel inverter, cascaded H-bridge, multi-carrier(MC) level shift pulse width modulation techniques,PID,PO,APOD and THD. Abstract :Nowadays, the industries demanding more power with low harmonics for the high power applications. Thus Multilevel Inverter concept has been introduced. The concept of the Multilevel Inverters becoming more popular for the high power applications due to less harmonics and high power ratings. The importance of the multilevel converters has been increased since the last decade. Several topologies have been implemented, amongst these topologies, the Cascaded H-bridge Multilevel Inverter is proposed. Cascaded MLI are ideal for connecting renewable energy sources with an AC grid. Even though the number of modulation techniques are available for controlling the multilevel inverter but, MULTI-CARRIER LEVEL-SHIFT PULSE WIDTH MODULATION TECHNIQUES are frequently used due to its simplicity and easy implementation. In this paper simplified simulation modelling of various multi-carrier level-shift PWM techniques (such as PID, PO, & APOD) are proposed for n-level generation. The proposed modulation techniques are explained for ‘21-LEVEL THREE PHASE CASCADED H-BRIDGE (CHB)’. The simulation of the modulation techniques is set up in MATLAB/Simulink. And an analysis has been made on calculating percentage THD for different multi-carrier level-shift PWM techniques.
Citing this Journal Article :Velishala Ramu, Dr. P. Satish Kumar, Dr. G.n.sreenivas , "21-level 3-phase cascaded h-bridge multi-level inverter with different multi-carrier level shift pwm techniques and their thd analysis", Volume 8 Issue 3 - May 2017, 5-13
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