Harmonic optimization in seven level inverter employing hybrid BBO/MADS algorithm

A hybrid optimization algorithm to find the optimum switching angles in a Multilevel Inverter (MLI) is proposed in this paper. The switching angles are optimized to eliminate low frequency harmonics. A seven level Cascaded Multilevel Inverter (CMLI) is considered and optimum switching angles are found by Hybrid Biogeographical based optimization search (BBO) / Mesh Adaptive Direct Search (MADS) algorithm. The low frequency Selective Harmonic Elimination-Pulse Width Modulation (SHE-PWM) technique and Optimal Minimization of Total Harmonic Distortion (OMTHD) technique are applied in order to reduce the switching losses. In SHE-PWM based approach, specific lower order harmonics are eliminated and fundamental component of output voltage is maintained at desired value. In OMTHD based approach the overall THD is minimized rather than eliminating specific low frequency harmonics. The various performance indices like phase THD, line THD, lower order harmonics eliminated in a CMLI are calculated from the optimized switching angles. A seven level CMLI is simulated in MATLAB/Simulink by using switching angles calculated from BBO/MADS algorithm. The FFT analysis of SHE-PWM and OMTHD approaches are compared and verified with the predicted values from BBO/MADS algorithm.

[1]  Dong Hwa Kim,et al.  A hybrid genetic algorithm and bacterial foraging approach for global optimization , 2007, Inf. Sci..

[2]  Holmes,et al.  Pulse width modulation for power converters , 2003 .

[3]  Hui Li,et al.  Optimized PWM strategy based on genetic algorithms , 2005, IEEE Transactions on Industrial Electronics.

[4]  Thierry Meynard,et al.  Multi-Level Choppers for High Voltage Applications , 1992 .

[5]  R. Iravani,et al.  A Space Vector Modulation Approach for a Multi-Module HVDC Converter System , 2007, 2007 IEEE Power Engineering Society General Meeting.

[6]  Zhong Du,et al.  A unified approach to solving the harmonic elimination equations in multilevel converters , 2004, IEEE Transactions on Power Electronics.

[7]  M.K. Fellah,et al.  Application of the optimal minimization of the THD technique to the multilevel symmetrical inverters and study of its performance in comparison with the selective harmonic elimination technique , 2006, International Symposium on Power Electronics, Electrical Drives, Automation and Motion, 2006. SPEEDAM 2006..

[8]  Zhong Du,et al.  A complete solution to the harmonic elimination problem , 2003, IEEE Transactions on Power Electronics.

[9]  M. T. Hagh,et al.  Harmonic Minimization in Multilevel Inverters Using Modified Species-Based Particle Swarm Optimization , 2009, IEEE Transactions on Power Electronics.

[10]  Dan Simon,et al.  Biogeography-Based Optimization , 2022 .

[11]  R. Iravani,et al.  A Space Vector Modulation Approach for a Multimodule HVDC Converter System , 2007, IEEE Transactions on Power Delivery.

[12]  Mariusz Malinowski,et al.  A Survey on Cascaded Multilevel Inverters , 2010, IEEE Transactions on Industrial Electronics.

[13]  Hirofumi Akagi,et al.  A New Neutral-Point-Clamped PWM Inverter , 1981, IEEE Transactions on Industry Applications.

[14]  P.N. Enjeti,et al.  Programmed PWM techniques to eliminate harmonics - A critical evaluation , 1988, Conference Record of the 1988 IEEE Industry Applications Society Annual Meeting.

[15]  S. Bernet,et al.  Design and comparison of 4.16 kV neutral point clamped, flying capacitor and series connected H-bridge multi-level converters , 2005, Fourtieth IAS Annual Meeting. Conference Record of the 2005 Industry Applications Conference, 2005..

[16]  Alex Q. Huang,et al.  Real-Time Calculation of Switching Angles Minimizing THD for Multilevel Inverters With Step Modulation , 2009, IEEE Transactions on Industrial Electronics.

[17]  Xiaoli Du,et al.  A Generalized Half-Wave Symmetry SHE-PWM Formulation for Multilevel Voltage Inverters , 2010, IEEE Transactions on Industrial Electronics.