Comparative Analysis of NR and TBLO Algorithms in Control of Cascaded MLI at Low Switching Frequency
| Autor: | V. Joshi Manohar, M. Trinad, K. Venkata Ramana |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Total harmonic distortion
THD Computer science 020208 electrical & electronic engineering Modulation index 020302 automobile design & engineering 02 engineering and technology teacher learning based optimisation NR method Nonlinear system 0203 mechanical engineering Three-phase Modulation selective harmonic elimination technique 0202 electrical engineering electronic engineering information engineering Harmonic cascaded multilevel inverter General Earth and Planetary Sciences Inverter Stochastic optimization Algorithm General Environmental Science Voltage |
| Zdroj: | Procedia Computer Science. 85:976-986 |
| ISSN: | 1877-0509 |
| DOI: | 10.1016/j.procs.2016.05.290 |
| Popis: | To control multilevel inverters in medium voltage drives applications which operate at a power level of mega watts, modulation control strategies at high switching frequency are not preferable due to high thermal losses and poor converter efficiency. Instead, fundamental switching frequency technique such as selective harmonic elimination technique is one of the widely used methods. The non linear transcendental trigonometric SHE equations set which are formed in control of multilevel inverter are highly non linear in nature, hence it has been a challenging task for researchers to obtain feasible solution at desired value of modulation index. So far, in literature several techniques have been proposed to obtain the feasible switching angles in control of MLI with less %THD. All the proposed stochastic optimization techniques need the declaration of algorithmic specific parameters. This paper presents, comparative analysis of NR method with random initial guess and novel algorithm such as teaching learning based optimization technique to solve SHE equation set at different values of modulation index. To validate the proposed technique, a three phase CHB seven level inverter has been considered and the developed algorithms are tested at different modulation indices and comparative analysis have been carried out. MATLAB programming and SIMULINK environment has been considered to validate proposed method . The %THD produced at different values of modulation indices are complies with IEEE 519-1992 harmonic guidelines too. |
| Databáze: | OpenAIRE |
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