Sequential Quadratic Programming (SQP) Based Selective Harmonic Elimination for Multilevel Inverter
N. Vinoth Kumar1, M. Pradish2
1N.Vinoth Kumar, Assistant Professor, Department of Electrical and Electronics Engineering, Kumaraguru College of Technology, Coimbatore (Tamil Nadu), India.
2M.Pradish, Engineering Officer, Metering and Utility Automation Division, Central Power Research Institute, Bangalore (Karnataka), India.
Manuscript received on 13 December 2018 | Revised Manuscript received on 22 December 2018 | Manuscript Published on 30 December 2018 | PP: 28-32 | Volume-8 Issue-2S, December 2018 | Retrieval Number: 100.1/ijeat.B10141282S18/18©BEIESP
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Abstract: Multilevel inverters are most preferable due to it reduced harmonic content and clean waveform. Since the Total Harmonic Distortion (THD) is a major selection criterion for an inverter, the reduction of the same must be most important for power electronics engineer. There are options for reduction of THD, usually filters are employed at output side to reduce THD and harmonic content. Also mathematically, it can be reduced using optimization techniques. The stepped voltage/current waveform of a MLI may synthesis a sinusoidal waveform with reduced THD, if the levels of MLI are increased. Lower order harmonics are dominating in nature which needs to be reduced. This proposed paper brings out a unique technique for suppressing/reducing the lower order harmonics using Selective Harmonic Elimination (SHE) technique. Sequential Quadratic Programming (SQP) algorithm is a optimizing algorithm which is used to find the angles where fifth and seventh harmonic are suppressed in a seven level inverter. SQP based optimized results shows better performance such as reduction of Total Harmonic Distortion (THD) and suppressing of lower order harmonics which is compared with particle swarm optimization (PSO) technique. Simulation results and experimental results proves the proposed concept.
Keywords: Multilevel Inverter, SHE Techniques, SQP, Harmonics Elimination.
Scope of the Article: Logic, Functional programming and Microcontrollers for IoT